9th Grade Science: Chemical Bonding Quiz
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Questions and Answers

What is the role of zinc in a voltaic cell?

  • It serves as the cathode.
  • It balances the overall charge.
  • It serves as the anode. (correct)
  • It serves as the site of reduction.

Which of the following compounds is classified as ionic?

  • Borane (BH3)
  • Water (H2O)
  • Sodium chloride (NaCl) (correct)
  • Hydrogen gas (H2)

What is formed during the reaction of sodium chloride?

  • An ionic compound. (correct)
  • A metallic bond.
  • A molecular compound.
  • A covalent compound.

Which type of bond exists in water (H2O)?

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

What does a voltmeter measure in a voltaic cell?

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

What leads to the formation of covalent compounds?

<p>The sharing of valence electrons. (D)</p> Signup and view all the answers

Which of the following is a characteristic property of ionic compounds?

<p>They conduct electricity when dissolved in water. (B)</p> Signup and view all the answers

Which of these compounds is formed by sharing electrons?

<p>Sulfur dioxide (SO2) (C)</p> Signup and view all the answers

What characteristic primarily differentiates ionic compounds from covalent compounds?

<p>Ionic compounds result from the transfer of electrons. (A)</p> Signup and view all the answers

Which physical state is typically associated with ionic compounds at room temperature?

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

What is a typical property of covalent compounds concerning their melting points?

<p>They usually have low melting points. (D)</p> Signup and view all the answers

What defines the electrical conductivity of ionic compounds in solution (aqueous state)?

<p>They conduct electricity. (B)</p> Signup and view all the answers

Which of the following is true concerning the flammability of ionic compounds?

<p>They are mostly nonflammable. (B)</p> Signup and view all the answers

What is the solubility behavior of ionic compounds in water?

<p>They generally have high solubility. (D)</p> Signup and view all the answers

How does the texture of ionic compounds generally compare to that of covalent compounds?

<p>Ionic compounds are hard and brittle. (A)</p> Signup and view all the answers

Which property is typically lower in ionic compounds compared to covalent compounds?

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

What primarily determines the polarity of compounds?

<p>The difference of elements involved (A)</p> Signup and view all the answers

Compounds that involve metal and nonmetal with an electronegativity difference greater than what value will form an ionic compound?

<p>1.9 (D)</p> Signup and view all the answers

Compounds with an electronegativity difference between 0.5 and 1.9 typically result in what type of covalent bond?

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

What characteristic is generally true for ionic compounds compared to covalent compounds?

<p>Higher melting and boiling points (D)</p> Signup and view all the answers

Which type of compounds are known to be harder and more brittle?

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

In a solution, which type of compounds can conduct electricity?

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

Which substances tend to be more flammable?

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

Which of the following is a characteristic of covalent compounds in solid form?

<p>Poor conductors of electricity (C)</p> Signup and view all the answers

Which of the following compounds is NOT ionic?

<p>C10H8 (B)</p> Signup and view all the answers

In a voltaic cell, which statement correctly describes the electrodes?

<p>One electrode is positive and one is negative. (C)</p> Signup and view all the answers

What is true about the reactions occurring in a voltaic cell?

<p>The reactions produce electric current. (C)</p> Signup and view all the answers

Which of the following pairings correctly identifies the roles of the electrodes in a voltaic cell?

<p>Anode – oxidation: cathode – reduction (D)</p> Signup and view all the answers

Which compound is considered an electrolyte used to replenish ions in the body?

<p>Calcium (A), Potassium (B), Sodium (D)</p> Signup and view all the answers

Which of the following correctly identifies the relationship between anode and cathode?

<p>Electrons flow from the anode to the cathode. (C)</p> Signup and view all the answers

Which property distinguishes between ionic and covalent compounds?

<p>Electrical conductivity in aqueous solution (B)</p> Signup and view all the answers

Which statement is TRUE regarding ionic and covalent compounds?

<p>Ionic compounds often dissolve well in water. (C)</p> Signup and view all the answers

What kind of substance is represented by the structure if it forms by sharing electrons?

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

Which properties are characteristic of covalent compounds?

<p>They are soft and flexible. (A)</p> Signup and view all the answers

What is the nature of the substances with high melting points and crystalline structure?

<p>Ionic compounds with high melting points (A)</p> Signup and view all the answers

Why do covalent compounds generally not conduct electricity when dissolved in water?

<p>Covalent compounds dissolve into molecules. (A)</p> Signup and view all the answers

Which of the following substances does NOT conduct electricity?

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

Which type of matter can exist in solid, liquid, and gas forms at normal conditions?

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

Which elements will most likely form a nonpolar covalent compound?

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

Which of the following statements about covalent compounds is incorrect?

<p>They have high melting points. (B)</p> Signup and view all the answers

What process leads to the formation of water?

<p>Interaction of two hydrogen atoms with one oxygen atom (D)</p> Signup and view all the answers

Which characteristic is true about ionic compounds?

<p>Conduct electricity when dissolved in water (C)</p> Signup and view all the answers

Why are covalent compounds generally insoluble in water?

<p>They are nonpolar and do not dissolve in polar solvents (A)</p> Signup and view all the answers

Which of the following compounds is identified as covalent?

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

What is the primary reason ionic compounds have high melting points?

<p>Strong attraction between oppositely charged ions (C)</p> Signup and view all the answers

Which characteristic is not typical of covalent compounds?

<p>High boiling point (D)</p> Signup and view all the answers

How can you determine if a compound is ionic?

<p>By the transfer of electrons between metals and non-metals (A)</p> Signup and view all the answers

Which statement is false regarding the properties of sugars?

<p>Sugar conducts electricity when in solid form (C)</p> Signup and view all the answers

Flashcards

What type of compound is NaCl?

NaCl is an ionic compound. Ionic compounds are formed when a metal atom loses an electron (forms a positive ion) and a nonmetal atom gains an electron (forms a negative ion). The resulting ions are attracted to each other by electrostatic forces, forming a strong ionic bond.

What type of compound is C10H8?

C10H8 (naphthalene) is a covalent compound. Covalent compounds are formed when two or more nonmetal atoms share electrons, creating a covalent bond.

What is a voltaic cell?

A voltaic cell is a device that converts chemical energy into electrical energy. It consists of two electrodes (anode and cathode) immersed in an electrolyte solution. A spontaneous chemical reaction occurs within the cell, generating an electric current.

What happens at the anode in a voltaic cell?

The anode is the electrode where oxidation occurs. Oxidation is the loss of electrons. In a voltaic cell, the anode is the negative electrode.

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What happens at the cathode in a voltaic cell?

The cathode is the electrode where reduction occurs. Reduction is the gain of electrons. In a voltaic cell, the cathode is the positive electrode.

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What are electrolytes?

Electrolytes are substances that conduct electricity when dissolved in water. They form ions (charged particles) in solution, allowing the flow of electric current.

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What is glucose?

Glucose is a simple sugar (carbohydrate) that provides energy to the body. It is not an electrolyte because it does not dissociate into ions in solution.

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Why are electrolytes important for the body?

Electrolytes are essential for various bodily functions, including nerve impulse transmission, muscle contraction, and fluid balance. They are lost through sweat, so replenishing them is crucial.

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What are the types of elements involved in forming NaCl and H2O?

Sodium chloride (NaCl) is formed from a metal (sodium, Na) and a non-metal (chlorine, Cl). Water (H2O) is formed from two non-metals (hydrogen, H and oxygen, O).

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How do NaCl and H2O form?

Sodium chloride (NaCl) forms by transferring electrons from sodium to chlorine, forming ions that attract each other. Water (H2O) forms by sharing electrons between hydrogen and oxygen, forming a covalent bond.

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What leads to the transfer or sharing of valence electrons?

The transfer or sharing of valence electrons is driven by the desire of atoms to achieve a stable electron configuration (usually having a full outer shell).

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What type of compound is NaCl and H2O?

Sodium chloride (NaCl) is an ionic compound, formed by the electrostatic attraction between oppositely charged ions. Water (H2O) is a covalent compound, formed by the sharing of electrons between atoms.

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Ionic Compound

A compound formed by the electrostatic attraction between oppositely charged ions. These ions are formed by the transfer of electrons between a metal and a non-metal.

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Covalent Compound

A compound formed by the sharing of electrons between two or more non-metals.

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What is a salt bridge?

A salt bridge is a component in a voltaic cell that connects the two half-cells, allowing the flow of ions to maintain electrical neutrality. It prevents the buildup of charge in each half-cell, ensuring the continuous flow of electrons.

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Compound

A substance made up of two or more elements chemically bonded together in a fixed ratio.

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Physical Properties of Compounds

Observable characteristics of a compound, such as its state of matter, melting point, solubility, and conductivity.

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Ionic Compound Physical Properties

Often crystalline solids, have high melting/boiling points, dissolve readily in water, and conduct electricity when dissolved.

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Covalent Compound Physical Properties

Can be solids, liquids, or gases, have lower melting/boiling points, less soluble in water, and do not conduct electricity well.

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Polarity in Compounds

The uneven distribution of electrical charge over the atoms within a compound, due to the sharing of electrons.

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Flammability of Compounds

The ability of a compound to burn in the presence of oxygen.

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Electronegativity difference and compound type

The electronegativity difference between elements in a compound determines its type. A large difference (greater than 1.9) indicates an ionic compound, while a smaller difference (less than 1.9 but greater than 0.5) indicates a polar covalent compound. Nonmetals with similar electronegativity form nonpolar covalent bonds.

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Properties of ionic compounds

Ionic compounds are typically hard, brittle substances with high melting points. They dissolve readily in water and conduct electricity when dissolved.

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Properties of covalent compounds

Covalent compounds are generally softer and more flexible than ionic compounds. Their melting points tend to be lower, and they are often poor conductors of electricity.

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Ionic vs. Covalent in water

Ionic compounds dissolve well in water because the polar water molecules attract and surround the ions. Covalent compounds, especially nonpolar ones, are less soluble in water.

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Examples of ionic and covalent in daily life

Many everyday substances are ionic or covalent compounds. For example, water is a polar covalent compound essential for life, while table salt (NaCl) is an ionic compound used for flavoring and preserving food.

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Electrolytes in solution

Electrolytes are substances that conduct electricity in solution. They are composed of ions that can move freely when dissolved.

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Electrolytes in daily life

Electrolytes play crucial roles in the body, helping with nerve impulse transmission, muscle contraction, and maintaining fluid balance.

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What is a covalent compound?

A covalent compound is formed when two or more nonmetals share electrons.

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What are the properties of covalent compounds?

Covalent compounds are generally soft, flexible, and do not conduct electricity in solid or liquid forms. They can exist as solids, liquids, or gases.

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Why don't covalent compounds conduct electricity in water?

Covalent compounds dissolve into molecules, which don't have charged particles (ions) to carry electricity.

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What is an ionic compound?

An ionic compound is formed by the electrostatic attraction between oppositely charged ions. These ions are formed when a metal atom loses an electron (positive ion) and a nonmetal atom gains an electron (negative ion).

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What are the properties of ionic compounds?

Ionic compounds are typically hard and brittle, with high melting and boiling points. They conduct electricity when dissolved in water, forming free-moving ions.

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How do covalent and ionic compounds differ?

Covalent compounds form by sharing electrons between nonmetals, while ionic compounds form by the transfer of electrons between a metal and a nonmetal. Covalent compounds often exist as molecules, while ionic compounds form a crystal lattice.

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What are examples of covalent compounds?

Examples of covalent compounds include water (H2O), carbon dioxide (CO2), and methane (CH4).

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What are examples of ionic compounds?

Examples of ionic compounds include table salt (NaCl), sodium chloride (KCl), and magnesium chloride (MgCl2).

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Why do compounds form?

Individual atoms in a compound are inherently unstable. They gain stability by transferring or sharing their valence electrons to achieve a full outer shell of electrons.

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Why do ionic compounds have high melting points?

Ionic compounds have a strong force of attraction between their oppositely charged ions. This requires a large amount of heat energy to separate them, resulting in a high melting point.

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Why are covalent compounds generally insoluble in water?

Covalent compounds are often nonpolar, while water is polar. Like dissolves like, so nonpolar compounds don't mix well with polar water molecules.

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How can you identify ionic compounds?

Ionic compounds are formed from the transfer of electrons between a metal and a nonmetal.

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How can you identify covalent compounds?

Covalent compounds are formed by the sharing of electrons between two or more non-metals.

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What makes a compound conductive?

Ionic compounds can conduct electricity because they form ions when dissolved in water or melted. These ions can move freely, carrying an electric charge.

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Study Notes

Module Title

  • Science Quarter 2-Matter, Module 2: Chemical Bonding: Properties of Compounds

Module Information

  • Grade level 9
  • First Edition, 2020
  • Published by the Department of Education

Development Team

  • Merry Chris T. Tabligan, Writer
  • Loreta E. Santos, Editor
  • Various reviewers, editors, language specialists, designers, and layout artists
  • Various management team members

Learning Competency

  • Recognize different types of compounds (ionic or covalent) based on their properties such as melting point, hardness, polarity, and electrical and thermal conductivity. (S9MT-IIb-14)
  • After studying this module, students will be able to :
    • identify and describe ionic and covalent compounds based on their chemical formula and chemical names
    • list and explain the different physical properties of ionic and covalent compounds
    • distinguish ionic from covalent compounds based on their physical properties
    • give examples of natural phenomena utilizing the unique physical properties of ionic and covalent compounds

Introductory Message

  • The Self-Learning Module (SLM) is a tool for students to continue their learning at home.
  • Pre-tests and post-tests are included in each module to assess prior and current knowledge
  • Notes to the teacher are provided for facilitators and parents.
  • Do not write in this module unless it is for answering the tasks. Use a separate sheet of paper to answer the tests and exercises. Always read instructions carefully.

What I Need to Know

  • This module is organized to assist students with the learning competency of recognizing various chemical compounds (ionic or covalent).
  • The arrangement of lessons follows the standard sequence of the course but can be changed according to your textbook
  • The module focuses on the competency of identifying various chemical compounds.

Other Information

  • Specific activities and questions on various concepts about chemical compounds are included in the module, to help students achieve the learning competency.
  • Understanding the composition differences helps explain the different properties in the various compounds.

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Related Documents

Science 9 Q2 Module 2: Chemical Bonding PDF

Description

Test your understanding of chemical bonding concepts in 9th grade science. This quiz focuses on identifying and describing ionic and covalent compounds based on their properties. Gain insights into their physical characteristics, such as melting point and conductivity, while recognizing the differences between these two types of compounds.

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