Chemical Bonds and Compound Nomenclature

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Questions and Answers

What is the fundamental characteristic of a chemical bond?

  • A temporary connection between atoms
  • A repulsion between atoms
  • A reaction that destroys atoms
  • A lasting attraction between atoms, ions, or molecules (correct)

Which process primarily defines the formation of an ionic bond?

  • Transfer of electrons (correct)
  • Sharing of electrons
  • Mixing of protons
  • Creation of neutrons

What is a typical electronegativity difference associated with ionic bonds?

  • Generally greater than 1.7 (correct)
  • Around 1.0
  • Equal to zero
  • Less than 0.4

What type of elements are typically involved in covalent bonds?

<p>Two nonmetals (B)</p> Signup and view all the answers

What do atoms do to attain octets in covalent bonds?

<p>Share pairs of electrons (B)</p> Signup and view all the answers

What characterizes the attraction between molecules in covalent compounds?

<p>Generally weak (C)</p> Signup and view all the answers

What are metallic bonds characterized by?

<p>Attraction between free-floating valence electrons and positively charged metal cations (B)</p> Signup and view all the answers

What is the overall charge of a metal?

<p>Neutral (D)</p> Signup and view all the answers

What does a chemical formula indicate?

<p>The kind and number of atoms in the smallest representative unit (A)</p> Signup and view all the answers

What type of compound produces $H^+$ in water?

<p>Acid (A)</p> Signup and view all the answers

What is used to indicate the ionic charge of a cation in traditional naming of Type II compounds?

<p>Roman numeral (B)</p> Signup and view all the answers

In the traditional naming system, what suffix is added to the ion with the lower valence state?

<p>-ous (A)</p> Signup and view all the answers

Which of the following is the correct formula for barium sulfide?

<p>BaS (B)</p> Signup and view all the answers

In naming covalent compounds, what ending is added to the second element?

<p>-ide (B)</p> Signup and view all the answers

Which prefix is NOT used when naming the first element in a covalent compound?

<p>Mono- (B)</p> Signup and view all the answers

What prefix is used at the beginning of the name of a binary acid?

<p>Hydro- (B)</p> Signup and view all the answers

The second word when naming a binary acid is always what?

<p>Acid (C)</p> Signup and view all the answers

What is the name of the acid with one more oxygen than the -ic acid?

<p>Per- -ic acid (D)</p> Signup and view all the answers

What type of ions are formed after elements have shared electrons?

<p>Polyatomic ions (C)</p> Signup and view all the answers

What is the name of the acid with one less oxygen than the -ous acid?

<p>Hypo- -ous acid (D)</p> Signup and view all the answers

In naming ionic compounds containing polyatomic ions, what should you use?

<p>The polyatomic ion's name (B)</p> Signup and view all the answers

What is the correct chemical formula for ammonium fluoride?

<p>NH4F (A)</p> Signup and view all the answers

What is the correct name for the compound with the formula $Mg(NO_3)_2$?

<p>Magnesium nitrate (A)</p> Signup and view all the answers

Why is it important to include the charge of transition metals in their names?

<p>Their charges are less predictable (C)</p> Signup and view all the answers

What is the charge of iron in iron (II) oxide?

<p>+2 (D)</p> Signup and view all the answers

What is the charge of copper in copper (I) chloride?

<p>+1 (B)</p> Signup and view all the answers

Which of the following elements always forms positive ions?

<p>Metals (A)</p> Signup and view all the answers

What is the chemical formula for the compound formed between $Fe^{+3}$ and $O^{-2}$?

<p>$Fe_2O_3$ (A)</p> Signup and view all the answers

In writing the formula for an ionic compound, which ion is written first?

<p>Cation (B)</p> Signup and view all the answers

What type of charge do metals typically acquire when forming ions?

<p>Positive (A)</p> Signup and view all the answers

Ions with a negative charge are called what?

<p>Anions (D)</p> Signup and view all the answers

When writing formulas for ionic compounds, which ion is written first?

<p>Positive ion (B)</p> Signup and view all the answers

In the 'crisscross method,' what becomes the subscript of the negative ion?

<p>The valence of the positive ion (A)</p> Signup and view all the answers

What is the correct way to write Calcium Bromide?

<p>Calcium Bromide (A)</p> Signup and view all the answers

What is the name of the compound with the formula NaF?

<p>Sodium Fluoride (B)</p> Signup and view all the answers

When naming ionic compounds, what ending is added to the nonmetal ion?

<p>-ide (D)</p> Signup and view all the answers

What is the name of the compound $MgI_2$?

<p>Magnesium Iodide (A)</p> Signup and view all the answers

Which of the following is the correct formula for lithium sulfide, ?

<p>$Li_2S$ (D)</p> Signup and view all the answers

When naming polyatomic ions, what ending indicates the use of a lower oxidation number in the middle ion?

<p>-ite (D)</p> Signup and view all the answers

When naming Type II ionic compounds using the traditional naming system, what information does the suffix '-ic' convey about the metal cation?

<p>It indicates the cation has a higher oxidation state. (B)</p> Signup and view all the answers

Which of the following formulas is incorrectly matched with its traditional name, considering the variable valences of the metal cations?

<p>FeO - Ferric Oxide (B)</p> Signup and view all the answers

What prefix is used to indicate the presence of five atoms of an element in a covalent compound?

<p>Penta- (D)</p> Signup and view all the answers

In naming binary acids, what is the purpose of the 'hydro-' prefix?

<p>To indicate the acid is formed from hydrogen and a nonmetal. (C)</p> Signup and view all the answers

What is the correct formula for Strontium Sulfide?

<p>SrS (D)</p> Signup and view all the answers

Which of the following is the correct formula for Aluminum Bromide?

<p>AlBr₃ (B)</p> Signup and view all the answers

What is the correct name for $N_2O_5$?

<p>Dinitrogen pentoxide (B)</p> Signup and view all the answers

Which formula represents hypoiodous acid?

<p>$HIO$ (D)</p> Signup and view all the answers

How would you name an acid with one more oxygen atom than its '-ic' acid counterpart, according to common nomenclature rules?

<p>Add the prefix 'per-' and the suffix '-ic'. (A)</p> Signup and view all the answers

What information does the Roman numeral in the name of a Type II compound, such as Iron (II) oxide, convey?

<p>The oxidation state or charge of the metal cation. (D)</p> Signup and view all the answers

In forming an ionic compound with iron, oxygen usually exists as $O^{-2}$. If iron is in the +3 oxidation state, what is the correct formula for the resulting iron oxide?

<p>$Fe_2O_3$ (B)</p> Signup and view all the answers

When writing the formula for an ionic compound, which of the following guidelines is followed?

<p>The cation is written before the anion. (A)</p> Signup and view all the answers

What determines the overall charge of an ionic compound?

<p>The sum of the charges of all ions, which should equal zero. (C)</p> Signup and view all the answers

Ions containing multiple atoms are called what?

<p>Polyatomic ions (D)</p> Signup and view all the answers

In the chemical formula $Mg(NO_3)_2$, what does the subscript '2' after the parentheses indicate?

<p>Two nitrate polyatomic ions (B)</p> Signup and view all the answers

Why is it important to specify the charge of transition metals when naming ionic compounds?

<p>Transition metals can form ions with different charges. (C)</p> Signup and view all the answers

What is the correct chemical formula for the ionic compound formed between aluminum ($Al^{+3}$) and oxygen ($O^{-2}$)?

<p>$Al_2O_3$ (B)</p> Signup and view all the answers

If element X forms a +2 ion and element Y forms a -3 ion, what is the correct formula for the ionic compound they form?

<p>$X_3Y_2$ (D)</p> Signup and view all the answers

Considering the common charges of ions, which of the following combinations of ions would NOT form a stable ionic compound?

<p>$Al^{3+}$ and $Mg^{2+}$ (B)</p> Signup and view all the answers

What is the primary result of a metal atom losing electrons?

<p>Formation of a cation with a positive charge. (D)</p> Signup and view all the answers

In the 'crisscross method' of writing chemical formulas, what does the valence of the positive ion become?

<p>The subscript of the negative ion. (A)</p> Signup and view all the answers

Which of the following is a general rule for naming binary ionic compounds?

<p>The metal is named first, and the nonmetal name is modified to end in '-ide'. (A)</p> Signup and view all the answers

What does the suffix '-ite' indicate when naming polyatomic ions?

<p>The middle atom in the polyatomic ion has a lower oxidation state. (D)</p> Signup and view all the answers

When is it unnecessary to 'criss-cross' valences when writing the formula of an ionic compound?

<p>When the valences of the ions are numerically equal. (D)</p> Signup and view all the answers

In writing ionic formulas, under what condition do you enclose a radical (polyatomic ion) within parentheses?

<p>When the subscript of the radical is greater than 1. (D)</p> Signup and view all the answers

What determines the charge of an ion based on its position in the periodic table?

<p>The group number of the element. (C)</p> Signup and view all the answers

A nonmetal typically achieves a stable electron configuration by doing what?

<p>Gaining electrons to form an anion. (C)</p> Signup and view all the answers

What is the correct chemical name for $Sr(NO_3)_2$?

<p>Strontium Nitrate (A)</p> Signup and view all the answers

What is the first step in writing formulas of ionic compounds?

<p>Write the symbol of the cation. (A)</p> Signup and view all the answers

Which characteristic of ionic bonds primarily dictates the exothermic nature of their formation?

<p>The transfer of electrons between atoms with significantly different electron affinities. (B)</p> Signup and view all the answers

How does the 'sea of electrons' contribute to the characteristic properties of metals?

<p>It allows for high electrical and thermal conductivity due to the mobility of electrons. (B)</p> Signup and view all the answers

What factor primarily determines whether a compound is classified as ionic or covalent?

<p>The magnitude of electronegativity difference between the bonding atoms. (A)</p> Signup and view all the answers

How does the sharing of electrons in covalent bonds allow atoms to achieve a stable electron configuration?

<p>By having each atom contribute electrons to attain an octet in their valence shell. (A)</p> Signup and view all the answers

Consider the compound $K_2S$. Based on the typical properties associated with its constituent elements, what type of bonding is most likely present?

<p>Ionic bonding, due to the high electronegativity difference between potassium and sulfur. (C)</p> Signup and view all the answers

How do chemical reactions relate to the formation or breaking of chemical bonds?

<p>Chemical reactions involve electrons gaining, losing, or being shared, thereby forming or breaking chemical bonds. (C)</p> Signup and view all the answers

What distinguishes Type I ionic compounds from Type II ionic compounds?

<p>Type I compounds involve metals that form only one type of cation, whereas Type II compounds involve metals that can form multiple types of cations. (C)</p> Signup and view all the answers

In nomenclature, what is the key difference in naming acids that contain oxygen compared to those that do not?

<p>Acids containing oxygen are named based on the polyatomic anion they contain, while those without oxygen are named as binary acids. (D)</p> Signup and view all the answers

What is the fundamental information conveyed by a chemical formula?

<p>The types of atoms and their respective quantities in the smallest representative unit of a substance. (C)</p> Signup and view all the answers

How are molecules generally attracted to each other in covalent compounds?

<p>Through generally weak attractive forces between molecules. (A)</p> Signup and view all the answers

In chemical nomenclature, what is the primary purpose of using numeric prefixes?

<p>To denote the number of atoms of each element in covalent compounds. (C)</p> Signup and view all the answers

When naming ionic compounds, what modification is made to the anion's name?

<p>The suffix '-ide' is added to the root of the anion's name. (D)</p> Signup and view all the answers

How are metal ions with multiple possible oxidation states differentiated in chemical nomenclature?

<p>By indicating the oxidation number as a Roman numeral in parentheses after the metal's name. (B)</p> Signup and view all the answers

What is the correct approach for naming compounds containing polyatomic ions?

<p>The polyatomic ion is treated as a single unit with a specific charge, and its name is used directly. (C)</p> Signup and view all the answers

In what order are the elements named in a binary covalent compound?

<p>The more metallic element is named first, followed by the less metallic element. (A)</p> Signup and view all the answers

If a compound contains both a metal with multiple charges and a polyatomic ion, what must be considered when naming it?

<p>The charges of both the metal ion and polyatomic ion must be balanced to ensure the compound is neutral. (A)</p> Signup and view all the answers

What does the term 'metallic character' refer to, and how does it influence the naming of covalent compounds?

<p>It refers to how readily an element loses electrons, influencing the order of naming elements in covalent compounds. (D)</p> Signup and view all the answers

What key piece of information does the Roman numeral in the name Iron (III) oxide provide about the compound?

<p>It specifies the oxidation state, or charge, of the iron ion. (B)</p> Signup and view all the answers

What type of ion do nonmetals typically form?

<p>Anions (C)</p> Signup and view all the answers

What charge do metals typically acquire when forming ions?

<p>Positive (B)</p> Signup and view all the answers

In the 'crisscross method,' what happens to the valence number of the positive ion?

<p>It becomes the subscript of the negative ion. (A)</p> Signup and view all the answers

In naming binary ionic compounds, what ending is added to the nonmetal ion's name?

<p>-ide (C)</p> Signup and view all the answers

What is the chemical name for $CaBr_2$?

<p>Calcium bromide (C)</p> Signup and view all the answers

In the formula $Sr(NO_3)_2$, what does the '2' subscript outside the parenthesis indicate?

<p>Two nitrate ions (C)</p> Signup and view all the answers

Which of the following compounds contains a metal and a nonmetal?

<p>$NaCl$ (B)</p> Signup and view all the answers

What is the formula for lithium sulfide?

<p>$Li_2S$ (A)</p> Signup and view all the answers

What is the first step in determining the formula of an ionic compound?

<p>Write the symbol of the cation. (B)</p> Signup and view all the answers

What should you use in naming ionic compounds containing polyatomic ions?

<p>The name of the polyatomic ion. (C)</p> Signup and view all the answers

How can the charges of transition metals be identified in Type II compounds?

<p>By the Roman numerals included in their name. (A)</p> Signup and view all the answers

In the formula $Fe_2O_3$, what is the charge of the iron ion?

<p>+3 (D)</p> Signup and view all the answers

What is the primary characteristic of ionic bond formation?

<p>Transfer of electrons (D)</p> Signup and view all the answers

What type of elements are typically involved in the formation of covalent bonds?

<p>Two nonmetals (C)</p> Signup and view all the answers

Why is it important to include the charge of transition metals in some ionic compound names?

<p>Because they can have multiple possible charges. (B)</p> Signup and view all the answers

What is the nature of attraction between molecules in covalent compounds?

<p>Weak (C)</p> Signup and view all the answers

What is the name of $NH_4F$?

<p>Ammonium Fluoride (D)</p> Signup and view all the answers

What is indicated by a chemical formula?

<p>Kind and number of atoms in the smallest representative unit of a substance (B)</p> Signup and view all the answers

What defines a substance as an acid?

<p>Produces $H^+$ in water (C)</p> Signup and view all the answers

When determining the formula from ions, what must the overall charge of the compound be?

<p>Neutral (D)</p> Signup and view all the answers

Which type of compound generally involves only nonmetals?

<p>Covalent (D)</p> Signup and view all the answers

What gain or loss do atoms undergo during chemical reactions?

<p>Atoms gain, lose, or share electrons. (B)</p> Signup and view all the answers

What happens to atoms in covalent bonds?

<p>Atoms share pairs of electrons to attain octets (B)</p> Signup and view all the answers

What suffix is added to the second element when naming covalent compounds?

<p>-ide (B)</p> Signup and view all the answers

What is the first word in naming binary acids?

<p>Hydro (C)</p> Signup and view all the answers

What is the second word when naming a binary acid?

<p>Acid (A)</p> Signup and view all the answers

When using traditional names for Type II compounds, what suffix is added to the atom with the lower valence state?

<p>-ous (A)</p> Signup and view all the answers

In traditional form, what suffix is added to the atom with the higher valence state?

<p>-ic (A)</p> Signup and view all the answers

How is the ionic charge of a cation indicated when using the modern naming system for Type II compounds?

<p>Roman numerals (C)</p> Signup and view all the answers

What type of elements primarily compose covalent compounds?

<p>Only nonmetals or metalloids (B)</p> Signup and view all the answers

What is the suffix added to the second element when naming binary compounds?

<p>-ide (A)</p> Signup and view all the answers

Which element is written first in the chemical name and formula of a binary compound?

<p>The more metallic element (B)</p> Signup and view all the answers

When should prefixes be used in naming binary compounds?

<p>Only for covalent compounds (C)</p> Signup and view all the answers

Which of the following prefixes indicates the number 4 in a chemical name?

<p>Tetra (A)</p> Signup and view all the answers

What do Roman numerals indicate when naming multivalent ionic compounds?

<p>The charge of the metal ion. (B)</p> Signup and view all the answers

For which element is the prefix 'mono' typically omitted?

<p>The first element (C)</p> Signup and view all the answers

Which of the following Roman numerals represents the number 3?

<p>III (A)</p> Signup and view all the answers

What is the chemical formula for aluminum oxide?

<p>Al2O3 (A)</p> Signup and view all the answers

What charge do Group 2 elements typically form when they become ions?

<p>+2 (B)</p> Signup and view all the answers

What is the charge of copper in copper(I) phosphide?

<p>+1 (A)</p> Signup and view all the answers

According to the octet rule, how many valence electrons do main group elements typically gain or lose?

<p>8 (D)</p> Signup and view all the answers

What is the total negative charge in chromium(III) bromide, $CrBr_3$?

<p>-3 (C)</p> Signup and view all the answers

Which of the following is a characteristic of ionic compounds but NOT covalent compounds?

<p>Does not use prefixes in the name (A)</p> Signup and view all the answers

Which of the following metals is most likely to form more than one stable ion?

<p>Iron (C)</p> Signup and view all the answers

What does the Roman numeral VI represent?

<p>6 (A)</p> Signup and view all the answers

The compound name Iron(II) chloride tells us that iron has a charge of?

<p>+2 (C)</p> Signup and view all the answers

What is the formula of chromium(III) bromide?

<p>CrBr$_3$ (B)</p> Signup and view all the answers

If a metal forms a +4 ion, what Roman numeral is shown in its name?

<p>IV (C)</p> Signup and view all the answers

When determining the formula of a multivalent ionic compound, what must be achieved?

<p>The total positive charge must equal the total negative charge. (A)</p> Signup and view all the answers

What is a key characteristic of ionic bond formation?

<p>Electrons are transferred. (A)</p> Signup and view all the answers

Which type of elements are most often involved in covalent bonds?

<p>Two nonmetals (B)</p> Signup and view all the answers

What is the overall charge of a metal sample?

<p>Neutral (D)</p> Signup and view all the answers

What is the role of valence electrons in metallic bonds?

<p>They form a 'sea of electrons' that can move freely. (A)</p> Signup and view all the answers

What is primarily indicated by a chemical formula?

<p>The kind and number of atoms in the smallest representative unit of a substance (C)</p> Signup and view all the answers

What is the distinguishing characteristic of an acid?

<p>It produces $H^+$ ions in water. (B)</p> Signup and view all the answers

What is the key difference between Type I and Type II ionic compounds?

<p>Type I compounds have only one type of cation; Type II have more than one type. (D)</p> Signup and view all the answers

In chemical reactions, what fundamental process occurs with electrons?

<p>Atoms gain, lose, or share electrons. (A)</p> Signup and view all the answers

What is a common trait between ionic and covalent bonds?

<p>Atoms attain a stable electron configuration. (D)</p> Signup and view all the answers

What is used to denote the charge of cations with multiple possible charges in Type II compounds?

<p>Roman numerals (B)</p> Signup and view all the answers

What suffix is used in the traditional naming system for the ion with the higher valence state?

<p>-ic (C)</p> Signup and view all the answers

Which of the following prefixes is NOT used when naming the first element in a covalent compound?

<p>Mono- (A)</p> Signup and view all the answers

What is the first step in determining the formula of an ionic compound containing a transition metal?

<p>Write the symbol of the cation. (D)</p> Signup and view all the answers

What is the symbol for the ammonium ion?

<p>$NH_4^+$ (B)</p> Signup and view all the answers

In the name 'Iron (II) oxide,' what does '(II)' indicate?

<p>The charge of the iron ion. (A)</p> Signup and view all the answers

What is the charge of the copper ion in copper (I) chloride?

<p>+1 (C)</p> Signup and view all the answers

In naming binary acids, the first word consists of what?

<p>Prefix 'hydro-', root of the nonmetal, and suffix '-ic' (A)</p> Signup and view all the answers

What is the chemical formula for magnesium nitrate?

<p>$Mg(NO_3)_2$ (D)</p> Signup and view all the answers

What is the first step in naming a covalent compound containing two nonmetals?

<p>Name the electropositive element first (D)</p> Signup and view all the answers

Why do transition metals typically have their charge included in the compound name?

<p>Their charges can vary. (A)</p> Signup and view all the answers

What is the formula of the polyatomic ion present in magnesium nitrate, $Mg(NO_3)_2$?

<p>Nitrate (C)</p> Signup and view all the answers

Which of the following is the correct name for $NH_4F$?

<p>Ammonium Fluoride (B)</p> Signup and view all the answers

What type of elements typically form positive ions?

<p>Metals (A)</p> Signup and view all the answers

What is the formula of the compound formed between $Fe^{+3}$ and $O^{-2}$?

<p>$Fe_2O_3$ (A)</p> Signup and view all the answers

What type of charge do nonmetals acquire when they gain electrons?

<p>Negative (D)</p> Signup and view all the answers

In the 'crisscross method', what becomes the subscript of the positive ion?

<p>The charge of the negative ion (A)</p> Signup and view all the answers

Which of the following is the correct formula for magnesium oxide?

<p>$MgO$ (C)</p> Signup and view all the answers

What is the correct name for $Sr(NO_3)_2$?

<p>Strontium nitrate (A)</p> Signup and view all the answers

What ending is added to the nonmetal ion when naming binary ionic compounds?

<p>-ide (C)</p> Signup and view all the answers

Which of the following describes the use of -ite?

<p>Middle ion uses lower positive oxidation (B)</p> Signup and view all the answers

In a balanced chemical equation, what principle dictates the relationship between the number of atoms of each element on the reactant and product sides?

<p>The number of atoms of each element must be equal on both sides, adhering to the law of conservation of mass. (B)</p> Signup and view all the answers

Given the unbalanced equation $CH_4(g) + O_2(g) \rightarrow CO_2(g) + H_2O(g)$, what is the coefficient for oxygen ($O_2$) when the equation is correctly balanced?

<p>2 (C)</p> Signup and view all the answers

Consider the reaction $2A + B \rightarrow C$. If 4 moles of A and 2 moles of B are reacted, and B is the limiting reactant, what is the maximum number of moles of C that can be formed?

<p>2 moles (B)</p> Signup and view all the answers

In the chemical equation $N_2(g) + 3H_2(g) \rightarrow 2NH_3(g)$, how many moles of ammonia ($NH_3$) can be produced from the complete reaction of 6 moles of hydrogen ($H_2$)?

<p>4 moles (B)</p> Signup and view all the answers

Given the chemical equation $2H_2(g) + O_2(g) \rightarrow 2H_2O(g)$, if the reaction starts with 4 grams of $H_2$ and excess $O_2$, what mass of $H_2O$ is produced (assuming complete conversion, and the molar mass of $H_2$ is 2 g/mol and $H_2O$ is 18 g/mol)?

<p>36 grams (D)</p> Signup and view all the answers

If a reaction's theoretical yield is 50.0 grams, but only 40.0 grams of product are actually obtained, what is the percentage yield of the reaction?

<p>80% (D)</p> Signup and view all the answers

Consider a scenario where 10.0 grams of reactant A (molar mass = 50 g/mol) reacts with 10.0 grams of reactant B (molar mass = 100 g/mol) to form product C according to the equation $A + 2B \rightarrow C$. Which reactant is the limiting reactant?

<p>Reactant B (A)</p> Signup and view all the answers

For the reaction $2CO(g) + O_2(g) \rightarrow 2CO_2(g)$, what volume of $O_2(g)$ is required to completely react with 4.0 L of $CO(g)$, assuming constant temperature and pressure?

<p>2.0 L (B)</p> Signup and view all the answers

In a closed system, if 10 grams of a substance 'X' reacts with 5 grams of substance 'Y' to produce substance 'Z', and after the reaction, traces of unreacted 'X' are found, what can be definitively stated about the masses?

<p>The mass of substance 'Z' will be less than 15 grams, because some 'X' remained unreacted. (C)</p> Signup and view all the answers

Considering periodic trends and electronegativity, which compound is most likely to exhibit the least polar covalent bond?

<p>$F_2$ (C)</p> Signup and view all the answers

Which of the following factors has the least influence on the strength of a metallic bond?

<p>The electronegativity difference between the metal and a nonmetal. (D)</p> Signup and view all the answers

Based solely on periodic trends, which of these pairings is least likely to result in the formation of a stable ionic compound?

<p>Carbon (C) and Hydrogen (H) (A)</p> Signup and view all the answers

The conductivity of metals is best explained by which of the following?

<p>The presence of a 'sea' of mobile valence electrons. (A)</p> Signup and view all the answers

Which statement relates to the impact of bond polarity on intermolecular forces?

<p>Nonpolar molecules cannot participate in dipole-dipole interactions, but they can experience London dispersion forces. (D)</p> Signup and view all the answers

Considering the nature of ionic compounds, which of the following properties is least likely to be exhibited by a typical ionic substance?

<p>Malleability and ductility in solid state. (C)</p> Signup and view all the answers

What determines the exothermic nature of ionic bond formation?

<p>The lattice energy released upon formation of the ionic lattice exceeds the energy required for ionization. (B)</p> Signup and view all the answers

Which statement accurately describes the behavior of valence electrons in metallic bonding?

<p>Valence electrons are delocalized and move freely throughout the metal lattice, forming a 'sea of electrons'. (D)</p> Signup and view all the answers

How does the 'sea of electrons' model explain metals' ability to deform under stress without fracturing?

<p>The delocalized electrons allow metal cations to slide past each other easily, maintaining the metallic bond. (A)</p> Signup and view all the answers

Considering the properties of different bond types, which compound would likely have the highest melting point?

<p>Sodium Chloride ($NaCl$) (B)</p> Signup and view all the answers

Why is it essential to use Roman numerals in the names of certain ionic compounds?

<p>To specify the charge of the cation with variable valence. (C)</p> Signup and view all the answers

In the traditional naming system, what principle dictates the assignment of '-ous' and '-ic' suffixes to metal cations?

<p>The '-ous' suffix denotes the metal cation with the lower oxidation state, while the '-ic' suffix signifies the higher one. (B)</p> Signup and view all the answers

What is the correct name formula of tin(IV) oxide?

<p>$SnO_2$ (C)</p> Signup and view all the answers

What is the purpose of adding prefixes when naming covalent compounds?

<p>To denote the number of atoms of each element in the molecule. (C)</p> Signup and view all the answers

In naming covalent compounds consisting of two nonmetals, which element is typically named first?

<p>The more electropositive element. (A)</p> Signup and view all the answers

Why is the prefix 'mono-' typically omitted when naming the first element in a covalent compound?

<p>Because it is assumed that if there is no prefix, there is only one atom of that element. (B)</p> Signup and view all the answers

What is the fundamental structural difference between binary acids and oxyacids?

<p>Oxyacids contain oxygen, while binary acids consist of hydrogen and one other element. (B)</p> Signup and view all the answers

What is the correct systematic name for $H_2SO_3$?

<p>Sulfurous Acid (D)</p> Signup and view all the answers

How is an oxyacid named when it contains one less oxygen atom than the acid with the '-ous' ending?

<p>It is named with the prefix 'hypo-' and the suffix '-ous'. (B)</p> Signup and view all the answers

Considering the electronic behavior during ionic bond formation, which statement accurately describes the charge acquisition by the participating atoms?

<p>Metals lose electrons to become positively charged cations, while nonmetals gain electrons to become negatively charged anions. (C)</p> Signup and view all the answers

When employing the crisscross method, if the charges of the ions are numerically equal, what adjustment is made to the subscripts in the resulting formula?

<p>The subscripts are omitted, as the 1:1 ratio inherently balances the charges. (D)</p> Signup and view all the answers

During the formulation of ionic compounds involving polyatomic ions, what governs the decision to enclose the polyatomic ion within parentheses?

<p>Parentheses are necessary when the subscript indicating the quantity of the polyatomic ion is greater than 1. (D)</p> Signup and view all the answers

In naming binary ionic compounds, how is the nonmetal ion's nomenclature modified to indicate its anionic state within the compound?

<p>The suffix '-ide' is added to the nonmetal's root name, signifying its anionic state. (D)</p> Signup and view all the answers

What is the correct name for $Sr(NO_3)_2$, considering the rules for naming ionic compounds with polyatomic ions?

<p>Strontium Nitrate (B)</p> Signup and view all the answers

When naming ionic compounds containing polyatomic ions that can exhibit multiple oxidation states, what is the significance of the suffixes '-ite' and '-ate'?

<p>'-ite' indicates a lower oxidation number (charge) for the central atom within the polyatomic ion, while '-ate' indicates a higher oxidation number. (C)</p> Signup and view all the answers

In the context of chemical nomenclature, when is it essential to specify the charge of a metal cation in an ionic compound's name, and why?

<p>It is only necessary when the metal is a transition metal that can exhibit multiple oxidation states to avoid ambiguity. (D)</p> Signup and view all the answers

How does the 'crisscross method' simplify the process of writing chemical formulas for ionic compounds?

<p>By providing a straightforward way to determine the subscripts needed to achieve charge neutrality in the compound. (A)</p> Signup and view all the answers

Considering the rules for naming ionic compounds, which guideline is most critical when dealing with metals that exhibit variable charges?

<p>Indicate the charge of the metal cation using Roman numerals in parentheses immediately following the metal's name. (B)</p> Signup and view all the answers

In naming ionic compounds, what is the function of the suffix '-ide' when added to the name of a nonmetal?

<p>It indicates that the nonmetal has formed a negative ion (anion). (C)</p> Signup and view all the answers

In forming an ionic compound between a transition metal and a polyatomic ion, what factor has the greatest influence on the compound's formula?

<p>The need to balance the charge of the transition metal cation with the overall charge of the polyatomic ion(s). (B)</p> Signup and view all the answers

If element 'M' has multiple oxidation states and forms a compound with the polyatomic ion $SO_4^{-2}$, what is the correct way to represent the name and formula of the compound when 'M' has a +3 charge?

<p>M(III) Sulfate, $M_2(SO_4)_3$ (A)</p> Signup and view all the answers

Why is it essential to specify the charge of transition metals using Roman numerals in Type II ionic compounds?

<p>To specify the oxidation state of the metal, as many transition metals have multiple possible charges. (A)</p> Signup and view all the answers

How does the presence of a polyatomic ion influence the naming conventions for ionic compounds?

<p>The name of the polyatomic ion is used directly without modification. (D)</p> Signup and view all the answers

Which of the following statements accurately describes the role of Roman numerals in the nomenclature of Type II ionic compounds?

<p>They specify the charge of the metal cation. (C)</p> Signup and view all the answers

Consider a scenario where tin (Sn) forms an ionic compound with oxygen. Given that tin can exist as either $Sn^{+2}$ or $Sn^{+4}$, what is the correct name and formula for the compound containing $Sn^{+4}$?

<p>Tin (IV) oxide, $SnO_2$ (D)</p> Signup and view all the answers

What principle governs the determination of the chemical formula for an ionic compound formed between a transition metal with a known charge and a polyatomic ion?

<p>The positive and negative charges must balance to create a neutral compound. (A)</p> Signup and view all the answers

Which of the following examples illustrates the correct application of Roman numerals in naming Type II ionic compounds, considering the possibility of multiple oxidation states?

<p>$SnO_2$ named as Tin(IV) Oxide. (C)</p> Signup and view all the answers

How does the method for determining the formula of an ionic compound containing a transition metal (with multiple possible charges) differ from that of a Type I ionic compound?

<p>Type II compounds require knowing the charge of the transition metal, while Type I compounds have metals with predictable charges. (D)</p> Signup and view all the answers

When naming ionic compounds containing transition metals and polyatomic ions, what determines whether you need Roman numerals and/or parentheses in the name?

<p>Parentheses are used only if there is more than one polyatomic ion, and Roman numerals are used only if the transition metal has more than one possible charge. (A)</p> Signup and view all the answers

Which factor most significantly dictates the state (gas, liquid, solid) of the products in a combustion reaction?

<p>The high temperatures commonly associated with combustion reactions. (A)</p> Signup and view all the answers

In a synthesis reaction where two elements combine to form a compound, what determines the precise stoichiometric ratio in which they will react?

<p>The stability of the resulting compound based on achieving a full electron shell. (D)</p> Signup and view all the answers

What is a critical difference in the products of the decomposition of a metal carbonate versus a metal hydroxide when both are heated under similar conditions?

<p>Metal carbonates release carbon dioxide, whereas metal hydroxides release water. (A)</p> Signup and view all the answers

Considering the reaction $Mg(OH)_2 \rightarrow MgO + H_2O$, what change in bonding characterizes the transformation of $Mg(OH)_2$ into $MgO$?

<p>Both ionic and covalent bonds are broken and reformed. (C)</p> Signup and view all the answers

In the context of single replacement reactions, what aspect of the replacing element primarily determines its capacity to displace another element from a compound?

<p>The replacing element's position within the activity series. (B)</p> Signup and view all the answers

How does increasing pressure typically affect the equilibrium of a synthesis reaction involving gases, such as $N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)$?

<p>It shifts the equilibrium towards the product, increasing $NH_3$ production. (B)</p> Signup and view all the answers

What is the primary energetic driving force behind the decomposition of a metal oxide at high temperatures?

<p>The decrease in Gibbs free energy due to heating. (A)</p> Signup and view all the answers

In a scenario where water ($H_2O$) is electrolyzed, producing hydrogen ($H_2$) and oxygen ($O_2$), how do the volumes of gases produced typically relate, assuming ideal gas behavior?

<p>Twice as much hydrogen is produced as oxygen due to the stoichiometry of the reaction. (D)</p> Signup and view all the answers

If a synthesis reaction between two gases, A and B, to form compound AB is exothermic, how would lowering the temperature affect the equilibrium concentration of AB?

<p>It would increase the concentration of AB by favoring the forward reaction. (C)</p> Signup and view all the answers

In single replacement reactions, what condition must be met for a metal A to successfully replace a metal B in a compound $BCl_2$?

<p>Metal A must be higher in the activity series than metal B. (A)</p> Signup and view all the answers

In a single replacement reaction where a metal displaces hydrogen from an acid, what factor primarily determines whether the reaction will occur spontaneously?

<p>The reduction potential of the metal relative to hydrogen; a metal with a more negative reduction potential will displace hydrogen. (B)</p> Signup and view all the answers

Consider a double replacement reaction where two aqueous solutions are mixed. If all potential product combinations are soluble in water, what is the most accurate conclusion?

<p>No reaction occurs because there is no net change in the ionic composition of the solution; only a mixing of ions. (A)</p> Signup and view all the answers

Why are double replacement reactions fundamentally excluded from being classified as redox reactions?

<p>The oxidation states of all elements remain constant throughout the reaction; there is no net transfer of electrons between reactants. (A)</p> Signup and view all the answers

In the context of identifying redox reactions, which scenario most definitively indicates that a decomposition reaction is also a redox reaction?

<p>A compound decomposes into its constituent elements in their standard states. (C)</p> Signup and view all the answers

Which of the following factors would prevent a single replacement reaction from occurring, assuming standard conditions and typical reactivity?

<p>The element attempting to displace another is already in its most stable oxidation state. (C)</p> Signup and view all the answers

Given the general form of a double replacement reaction, $AB + CD → AD + BC$, what condition must be met for the reaction to proceed to a significant extent toward product formation under typical laboratory conditions?

<p>At least one of the products (AD or BC) must be insoluble, forming a precipitate, or be a gas or a stable molecule like water. (D)</p> Signup and view all the answers

Consider the reaction $2H_2O_2(aq) → 2H_2O(l) + O_2(g)$. Which statement offers the most complete classification of this reaction?

<p>It is a decomposition reaction that is also a redox reaction due to the change in oxidation state of oxygen. (B)</p> Signup and view all the answers

For the reaction $CH_4(g) + 2O_2(g) → CO_2(g) + 2H_2O(g)$, which of the following statements accurately describes the changes in oxidation states?

<p>Carbon is oxidized, and oxygen is reduced. (D)</p> Signup and view all the answers

When Sodium Bicarbonate ($NaHCO_3$) reacts with Hydrochloric Acid ($HCl$), Carbon Dioxide ($CO_2$) gas is produced. What factor primarily drives this reaction to completion?

<p>The evolution of carbon dioxide gas, which escapes from the reaction mixture. (B)</p> Signup and view all the answers

In a scenario where zinc metal reacts with nickel chloride solution, forming zinc chloride and nickel metal, what is the role of zinc in this single replacement reaction from an electron transfer perspective.

<p>Zinc is oxidized, donating electrons to nickel ions. (C)</p> Signup and view all the answers

Flashcards

Chemical Bond

A lasting attraction between atoms, ions, or molecules that forms chemical compounds.

Ionic Bond

A chemical bond formed through the transfer of electrons between atoms.

Ionic Bond Formation

Formed by the attraction of oppositely charged ions.

Covalent Bond

A chemical bond where atoms share pairs of electrons.

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Covalent Bonds

A type of chemical bond typically found between two nonmetals.

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Metallic Bond

The forces of attraction between free-floating valence electrons and positively charged metal cations.

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Chemical Formula

Shows the types and numbers of atoms in the smallest representative unit of a substance.

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Ionic Compound

Compounds composed of cations (metals or polyatomic ions) and anions (nonmetals or polyatomic ions).

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Covalent Compound

Nonionic compounds, not composed of cations & anions, typically only nonmetals are present.

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Acid

Substances that produce H+ ions in water; hydrogen is typically written first in the chemical formula.

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Polyatomic Ions

Ions formed after elements share electrons, having a specific name.

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Naming Polyatomic Ions

Use the name of the polyatomic ion in the compound name.

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Steps for Ionic Formula

Cation symbol, anion symbol, determine charges, determine formula.

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Transition Metals

Metals with multiple possible charges, requiring a Roman numeral to indicate charge.

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Roman Numerals in Naming

To indicate the charge of the transition metal.

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Iron Charges

Iron (II) is +2, Iron (III) is +3.

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Copper Charges

Copper (I) is +1, Copper (II) is +2.

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Tin Charges

Tin (II) is +2, Tin (IV) is +4.

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Lead Charges

Lead (II) is +2, Lead (IV) is +4.

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Type II Naming Steps

Write cation, write anion, determine charges, determine formula.

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Anions

Atoms that gain electrons, resulting in a negative charge.

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Cations

Atoms that lose electrons, resulting in a positive charge.

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Crisscross Method

A method for writing formulas of ionic compounds by exchanging the numerical values of the ions' charges as subscripts.

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Rules for Ionic Compound Formulas

  1. Write the symbol of the positive ion first, followed by the negative ion. 2. If the subscript is 1, it is not written.
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Binary Ionic Compounds

Ionic compounds consisting of a metal and a non-metal.

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Naming Binary Ionic Compounds

  1. Name the metal ion. 2. Name the nonmetal ion and add '-ide' to the end.
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Naming Polyatomic Ionic Compounds

The positive ion name comes first, followed by the name of the negative radical. Negative radicals end in '-ite' or '-ate'.

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'-ite' vs '-ate'

'-ite' is used for the ion with the lower oxidation state, and '-ate' for the higher oxidation state.

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Formulas with Polyatomic Ions

Write the cation's symbol and charge, then the polyatomic ion's formula and charge. Crisscross the charges to determine subscripts.

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Naming Type II Compounds

Use a Roman numeral after the cation to indicate its ionic charge.

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'-ous' Suffix

Add the suffix '-ous' to the ion with the lower valence state.

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'-ic' Suffix

Add the suffix '-ic' to the ion with the higher valence state.

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Naming Covalent Compounds

  1. Name the electropositive element first.
  2. Name the second element, add '-ide' ending.
  3. Use prefixes to indicate the number of atoms of each element.
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Prefix 'Mono'

The prefix 'mono' is not used when naming the first element in a covalent compound.

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Naming Binary Acids

The name of a binary acid starts with 'hydro-', followed by the root of the nonmetal element, and ends with '-ic acid'.

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Naming Acids

The second word is always 'acid'.

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'per-____-ic acid'

An oxyacid with one more oxygen than the '-ic' acid.

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'-ous acid'

An oxyacid with one less oxygen than the '-ic' acid.

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'hypo-____-ous acid'

An oxyacid with one less oxygen than the '-ous' acid.

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Electronegativity

A measure of an atom's ability to attract electrons in a chemical bond.

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Ionic Bond Electron Transfer

Electrons are transferred, creating positive and negative ions.

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Exothermic Ionic Bond Formation

Energy released during the formation of ionic bonds.

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Covalent Bond Electron Sharing

Electrons are shared between atoms.

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Intermolecular Forces

Relatively weak attractions between molecules.

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Sea of Electrons

Valence electrons that are not held tightly & move freely.

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Metal Cations

Positively charged metal ions packed closely together.

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Ionic Substance Formation

A compound formed when electrons are transferred between atoms.

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Electronegativity Differences

Determining if it is an ionic or covalent bond.

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Ionic Substance Affinity

Ionic substances are formed when an atom that loses electrons, and reacts with an atom that has affinity for electrons.

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Nonmetals in Ionic Bonds

Atoms that gain electrons during ionic bonding, resulting in a negative charge.

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Metals in Ionic Bonds

Atoms that donate electrons during ionic bonding, resulting in a positive charge.

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Step 1: Naming Ionic Compounds

The first step is to write the name of the metal (positive ion).

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Step 2: Naming Ionic Compounds

The second step is naming the nonmetal ion and adding the suffix '-ide'.

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Subscript of Positive Ion

The charge of the negative ion.

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Iron (II) Charge

Fe²⁺

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Iron (III) Charge

Fe³⁺

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Copper (I) Charge

Cu⁺¹

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Copper (II) Charge

Cu²⁺

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Tin (II) Charge

Sn²⁺

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Type II Compound Naming

Use a roman numeral after the cation to indicate its charge.

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'-ous' Suffix Meaning

Add the suffix '-ous' to the metal with the lower valence state.

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'-ic' Suffix Meaning

Add the suffix '-ic' to the metal with the higher valence state.

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Covalent Compounds Naming

Name the electropositive element first, then the electronegative element with an '-ide' ending.

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Prefixes in Naming

Use prefixes to indicate the number of atoms of each element.

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Prefix 'Mono' at Start

The prefix 'Mono' is omitted for the first element.

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Acid as Second Word?

The second word in a binary acid's name.

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Chemical Nomenclature

The system of naming chemical compounds.

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Numeric Prefixes

Used exclusively with covalent compounds to indicate the number of atoms.

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Prefix: Mono

1

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Prefix: Di

2

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Prefix: Tri

3

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Naming Ionic Compounds

Full name of cation + root of anion + 'ide'.

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What is a Chemical Bond?

Attraction between atoms, ions, or molecules leading to chemical compound formation.

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What Happens in Ionic Bonds?

Electrons transferred; large electronegativity difference (>1.7).

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How are Ionic Bonds Formed?

Formed by oppositely charged ions; always exothermic.

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How Do Covalent Bonds Form?

Atoms share electron pairs to achieve stable octets.

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What are Metallic Bonds?

Attraction between floating valence electrons & metal cations.

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What are Chemical Formulas?

Shows atoms' kind and number in a substance's smallest unit.

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What is an Ionic Compound?

Cations (metals/polyatomic ions) and anions (nonmetals/polyatomic ions).

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What Defines a Covalent Compound?

Not composed of ions; typically only nonmetals present.

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What Defines an Acid?

Substances producing H⁺ ions when dissolved in water.

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What are the types of ionic compounds?

Anions and Cations observed.

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Nonmetal Ions

Atoms that gain electrons, resulting in a negative charge.

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Metal Ions

Atoms that lose electrons, resulting in a positive charge.

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Ionic Formula Order

Write the positive ion symbol first, then the negative.

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Subscript of One

If the subscript is '1', it is not written in the formula.

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Binary Ionic Compound Composition

Metal and non-metal

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Naming Binary Compounds

Write the name of the metal, then the nonmetal with '-ide'.

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Type II Compound Naming Steps

Write cation, write anion, determine charges, determine formula.

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Suffix '-ous'

Add '-ous' to the metal with the lower valence state.

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Suffix '-ic'

Add '-ic' to the metal with the higher valence state.

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Prefix 'Mono' usage

Mono is never used to name the first element.

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Oxyacids

These contain hydrogen, a nonmetal, and varying numbers of oxygen atoms.

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Multivalent Ions

Metals that can form multiple stable ions with different charges.

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Roman Numeral 'I'

1

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Roman Numeral 'II'

2

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Roman Numeral 'III'

3

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Roman Numeral 'IV'

4

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Roman Numeral 'V'

5

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Roman Numeral 'VI'

6

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Roman Numeral 'VII'

7

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Copper(I) Phosphide Formula

Cu3P

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Binary Compound

A chemical compound composed of only two different elements.

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Element Order

Write the less electronegative (more metallic) element first.

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Prefixes

Used to indicate the number of atoms of each element in a covalent compound.

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Mono Omission

The prefix 'mono' is omitted for the first element in a covalent compound.

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Octet Rule

Main group elements gain or lose electrons to achieve a noble gas configuration.

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Charge as Subscript

The magnitude of one ion's charge becomes the subscript of the other element in the formula.

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Electronegativity and Bonds

Difference in electronegativity that determines bond type.

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Ionic Substances

Compounds formed through the attraction of charged ions.

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Covalent Molecules Formation

Molecular species formed from atoms that share pairs of electrons in order to attain octets.

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Metal Cations Packing

Metals are closely packed together

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Chemical Formula Purpose

Shows the elements and their proportions in a compound.

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Ionic Compound Composition

Compounds containing metal cations (or polyatomic ions) and nonmetal anions (or polyatomic ions).

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Covalent Compound Composition

Compounds composed of only nonmetals, not composed of cations and anions.

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Acid Definition

Substances producing H+ (hydrogen ions) in water.

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Oxyanions

Anions that contain oxygen atoms.

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Nonmetals & Electrons

Atoms that gain electrons, resulting in a negative charge.

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Metals & Electrons

Atoms that lose or donate electrons, resulting in a positive charge.

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Compounds with Polyatomic ions

Ionic compounds containing more than two elements, often with polyatomic ions.

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-ite

Term used when the middle ion uses the lower oxidation

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What are Polyatomic Ions?

Ions formed when atoms share electrons; they have a specific name and act as a single unit.

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Naming w/Polyatomic Ions?

Use the name of the polyatomic ion directly when naming the compound.

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What are Transition Metals?

A metal that can form ions with different charges; Roman numerals denote the charge.

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What is the Roman Numeral For?

Indicates the charge of the transition metal cation in the compound.

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What is Iron (II)?

The charge of the iron cation in the compound.

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What is Iron (III)?

The cation charge of the iron cation in the compound.

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What is Copper (I)?

The charge of the copper cation in the compound.

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What is Copper (II)?

The charge of the copper cation in the compound.

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What is a Cation?

A metal ion formed by the loss of electrons, indicated with a positive charge.

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What are Subscripts?

Indicates the number of atoms or groups of atoms in a chemical formula.

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Chemical Equation

Representation of a chemical reaction using symbols and formulas.

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Reactants

Substances that start a chemical reaction.

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Products

Substances produced from a chemical reaction.

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Subscript

Number indicating quantity of atoms in a compound.

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Coefficient

Number indicating amount of moles of a substance.

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Balancing Equations

Ensuring equal numbers of each element on both sides of the equation.

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Physical State (s)

Solid state.

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Physical State (l)

Liquid state.

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Physical State (g)

Gas state.

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Electrons in Reactions

Chemical reactions involve atoms gaining, losing, or sharing these.

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What is an acid?

A compound type that produces H+ ions in water.

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Type II Ionic Compound

More than one type of cation can be observed.

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Type III Compound

Covalent, nonionic compounds, such as those in molecular species.

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Anion does not contain oxygen.

Acids where the anion does not contain oxygen.

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What is Oxyacid?

Acids where the anion contains oxygen.

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Electronegativity in Ionic Bonds

Electronegativity differences are generally greater than 1.7.

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Electron Sharing for Octets?

Atoms share pairs of electrons to reach stability.

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Overall Metal Charge

The overall electrical charge of a metal.

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'-ite' Rule

The negative radical uses lower oxidation in the middle ion

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'-ate' Rule

The negative radical uses higher oxidation

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Ionic Formula Steps

Write the cation symbol, then the anion symbol, determine charges, and derive the formula.

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What are Roman Numerals for?

Roman numerals indicate a transition metal's charge.

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What does Iron(||) mean?

Indicates a +2 charge on iron.

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What does Iron(|||) mean?

Indicates a +3 charge on iron.

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What does Copper(|) mean?

Indicates a +1 charge on copper.

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What does Copper(||) mean?

Indicates a +2 charge on copper.

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What does Tin(||) mean?

Indicates a +2 charge on tin.

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What are Oxyacids?

These are acids including hydrogen, a nonmetal, and varying numbers of oxygen atoms.

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Single Replacement Reaction

A reaction where one element replaces a similar element in a compound.

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Metal Displacement

A metal displaces another metal in solution.

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Double Replacement Reaction

Two compounds exchange ions or elements.

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Precipitation Reaction

Mixing aqueous solutions results in a solid.

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Acid-Base Neutralization

Acid reacts with a base to form salt and water.

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Gas Evolution Reaction

Mixing aqueous solutions results in a gas.

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No Reaction

Mixing aqueous solutions results in aqueous products, and no visible reaction occurs.

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Redox Reaction

The transfer of electrons between chemical species.

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Oxidation

A loss of electrons by a molecule, atom, or ion.

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Reduction

A gain of electrons by a molecule, atom, or ion.

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Combustion Reaction

Burning a substance that releases heat energy, often producing CO2 and H2O.

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Synthesis Reaction

Combining smaller substances into a larger, more complex one.

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Synthesis Reaction (Formula)

A reaction with the general form: A + B → AB

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Decomposition Reaction

Breaking down a larger compound into smaller components.

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Decomposition Reaction (Formula)

A reaction with the general form: AB → A + B

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Combustion Products

A substance (usually a hydrocarbon) reacts with oxygen to form carbon dioxide and water, releasing heat and light.

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Carbonate Decomposition

Metal carbonates break down into metal oxides and carbon dioxide when heated.

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Synthesis Reactions: Elements

Combine two elements to form a compound.

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General form of Synthesis Reaction

A reaction with the general form: A + B --> AB

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Study Notes

Chemical Bonds

  • Chemical bonds are lasting attractions between atoms, ions, or molecules.
  • Chemical bonds enable the formation of chemical compounds.

Ionic Bonds

  • Electrons are transferred.
  • Electronegativity differences are generally greater than 1.7.
  • Ionic substances are formed when an atom that loses electrons easily reacts with an atom that has a high affinity for electrons.
  • Ionic bonds are formed by the attraction of oppositely charged ions.
  • Formation of ionic bonds is always exothermic.

Covalent Bonds

  • Covalent bonds are often found between two nonmetals.
  • They are typical of molecular species.
  • Atoms bond together to form molecules with strong attraction.
  • Atoms share pairs of electrons to attain octets.
  • Molecules are generally weakly attracted to each other.
  • Covalent bond strength depends on the number of electron pairs shared by the atoms, with single bonds being weaker than double bonds, which in turn are weaker than triple bonds.

Metallic Bonds

  • Metallic bonds are the forces of attraction between free-floating valence electrons and positively charged metal cations.
  • In metal, cations are packed closely together.
  • Valence electrons of the metal atoms form a sea of electrons that drift freely.
  • The overall charge of metal is neutral.

Predicting Bond Types

  • Electronegativity differences in compounds can predict whether bonds are ionic or covalent.
  • Pure covalent bonds have electronegativity differences less than 0.4.
  • Polar covalent bonds have electronegativity differences between 0.4 and 1.8.
  • Ionic bonds have electronegativity differences greater than 1.8.

Comparison of Bond Types

  • Metallic bonding occurs between metals resulting in atoms seeking stability.
  • Atoms release their electrons to become cations.
  • Ionic bonding occurs between metal and non-metal resulting in atoms seeking stability.
  • Atoms give off or accept electrons, happening between atoms of great difference in electronegativity.
  • Covalent bonding occurs between non-metals resulting in atoms seeking stability.
  • Atoms share electrons with other atoms, happening between atoms of little difference in electronegativity.
  • Metallic bonds allow materials to be bent without breaking and to conduct electricity and heat, resulting in high melting and boiling points.
  • Ionic bonds easily break, and their ability to conduct electricity may depend on state, resulting in high melting and boiling points.
  • Covalent bonds result in fragility that depends on state, and the ability to conduct electricity may depend on the atoms, resulting low melting and boiling points.

Chemical Reactions

  • Chemical reactions occur when atoms gain, lose, or share electrons.
  • Nonmetals tend to gain electrons to become anions.
  • Metals lose electrons to become cations.

Nomenclature Rules for Compounds

  • To determine what type of compound you have start with the first level:
  • Ionic compounds are composed of cations (metals or polyatomic ions) and anions (nonmetals or polyatomic ions).
  • Covalent compounds are nonionic and not composed of cations & anions, consist only of nonmetals.
  • Acids produce H in water, the hydrogen cation is generally written first in the chemical formula.
  • For ionic compounds, there are two further levels:
  • Type I compounds only have one type of cation.
  • Type II compounds have more than one.
  • For acids, there are two further levels:
  • Some acids' anion do not contain oxygen.
  • Some acids' anion contain oxygen.

Ion Charges

  • An ion's charge can be determined by its place on the periodic table.

Naming Rules for Polyatomic Ions

  • The name of the positive ion proceeds the negative radical.
  • The negative radical either ends in "ite" or "ate".
  • "-ite" is used when the middle ion uses lower oxidation.
  • "-ate" is used with higher oxidation.

Naming Covalent Compounds

  • For covalent compounds containing two nonmetals:
  • Name the electropositive element first.
  • Write the name of the second element with an "-ide" ending.
  • Use prefixes to indicate the number of atoms of each element (mono-, di-, tri-, tetra-, penta-, hexa-, hepta-, octa-, nona-, deca-).
  • The prefix "mono-" is never used to name the first element.

Naming Acids and Oxy-Acids

  • For acids that begin with H, there are 2 categories of 2 Elements, and 3 elements
  • For Two Elements: Hydro + stem + ic, for example Hydrochloric Acid
  • For Three Elements which have oxygen -
  • if the common ion table name ends in ate, the Acid contains stem + ic, for example Nitric Acid
  • if the common ion table name ends in ite, the Acid contains stem + ous, for example Nitrous acid
  • The name of a binary acid consists of two words.
  • The first word has three parts: hydro prefix, the root of the nonmetal element, and the "ic" ending.

Naming Binary Acids

  • The name of the binary acid consists of two words.
  • The first word has the "hydro" prefix, the root of the nonmetal element, and the “ic” ending. the second work is always "acid"

Naming Oxyacids

  • These are more difficult to name because these acids have hydrogen, a nonmetal, and may have varying numbers of oxygen atoms.
  • for example H2SO5 H2SO4 H2SO3 and H2SO2 are all acids
  • H2SO5 = persulfuric acid; HNO4 = pernitric acid
  • H2SO4 = sulfuric acid; HNO3 = nitric acid
  • H2SO3 = sulfurous acid; HNO2 =nitrous acid
  • H2SO2 = hyposulfurous acid; HNO =hyponitrous acid
  • if the acid has one more oxygen than the -ic acid, it is called the per- -ic acid.
  • If the acid has one less oxygen than the -ic acid, it is called the -ous acid
  • If the acid has one less oxygen than the -ous acid, it is called the hypo- -ous acid. </existing_notes>

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