Gr 9 NATURAL SCIENCES: CH 2.1 SUM Compounds
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Questions and Answers

What is a compound?

  • A substance made up of two or more atoms of the same element
  • A substance made up of only one kind of atom
  • A substance made up of a fixed ratio of oxygen and hydrogen atoms
  • A substance made up of two or more different kinds of atoms (correct)

    • What is the term for the smallest repeating unit that represents the compound's composition in a crystal lattice?

  • Compound unit
  • Crystal lattice
  • Molecule
  • Formula unit (correct)

    • What is a characteristic of molecules?

  • They are made up of only one kind of atom
  • They are made up of two or more different kinds of atoms (correct)
  • They are always in a fixed ratio of hydrogen and oxygen atoms
  • They are always found in a crystal lattice

    • What is the difference between water (H₂O) and hydrogen peroxide (H₂O₂)?

    <p>The ratio of hydrogen to oxygen atoms</p> Signup and view all the answers

    Which of the following elements naturally exist as diatomic molecules?

    <p>Hydrogen and oxygen</p> Signup and view all the answers

    What is the ratio of hydrogen to oxygen atoms in water (H₂O)?

    <p>2:1</p> Signup and view all the answers

    What is the term for the clusters of atoms that are bonded together in a specific manner?

    <p>Molecules</p> Signup and view all the answers

    Which of the following is NOT a characteristic of compounds?

    <p>They are made up of only one kind of atom</p> Signup and view all the answers

    What is the arrangement of atoms in a crystal lattice?

    <p>Regular</p> Signup and view all the answers

    What is the result of the combination of atoms in a compound?

    <p>A substance with unique properties</p> Signup and view all the answers

    What is the chemical formula for water?

    <p>H₂O</p> Signup and view all the answers

    What type of forces hold atoms together in a compound?

    <p>Chemical bonds</p> Signup and view all the answers

    What is the purpose of the Periodic Table?

    <p>To organize all known elements in a systematic way</p> Signup and view all the answers

    What is the symbol for copper on the Periodic Table?

    <p>Cu</p> Signup and view all the answers

    What is the arrangement of elements on the Periodic Table?

    <p>In order of increasing atomic number</p> Signup and view all the answers

    What is the chemical formula for hydrogen peroxide?

    <p>H₂O₂</p> Signup and view all the answers

    What is the characteristic of metals on the Periodic Table?

    <p>All of the above</p> Signup and view all the answers

    What is the purpose of subscripts in a chemical formula?

    <p>To indicate the number of atoms of each element</p> Signup and view all the answers

    Who is credited with proposing the original Periodic Table?

    <p>Dmitri Mendeleev</p> Signup and view all the answers

    What is the classification of elements based on their position on the Periodic Table?

    <p>Metals, non-metals, and semi-metals</p> Signup and view all the answers

    What is the general rule for naming compounds containing a metal and a non-metal?

    <p>The metal is named first, followed by the non-metal with the suffix '-ide'</p> Signup and view all the answers

    What is the IUPAC naming system used for?

    <p>To standardize the names of compounds based on their elements</p> Signup and view all the answers

    What is the general rule for naming compounds containing only non-metals?

    <p>The element further to the left on the Periodic Table is named first</p> Signup and view all the answers

    What is the suffix used for the second element in a compound containing a metal and a non-metal?

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

    What is the prefix used to indicate one atom of an element in a compound?

    <p>mono-</p> Signup and view all the answers

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

    <p>Iron sulfide</p> Signup and view all the answers

    What is the characteristic of the alkali metals?

    <p>They are soft, have a dull-gray appearance, and react vigorously with water</p> Signup and view all the answers

    What is the reaction of potassium with water?

    <p>It reacts explosively with water to form potassium hydroxide and hydrogen gas</p> Signup and view all the answers

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

    <p>Magnesium oxide</p> Signup and view all the answers

    What is the purpose of assigning unique names to compounds?

    <p>To avoid confusion and ensure precise communication</p> Signup and view all the answers

    What is a characteristic of elements?

    <p>They are made up of only one kind of atom.</p> Signup and view all the answers

    What is a formula unit in a crystal lattice?

    <p>The smallest repeating unit that represents the compound's composition.</p> Signup and view all the answers

    What is unique about the ratio of atoms in a compound?

    <p>It is always fixed.</p> Signup and view all the answers

    Which of the following elements does NOT naturally exist as a diatomic molecule?

    <p>Copper (Cu).</p> Signup and view all the answers

    What determines the properties of a compound?

    <p>All of the above.</p> Signup and view all the answers

    What is the difference between a molecule and a crystal lattice?

    <p>A molecule is a cluster of atoms, while a crystal lattice is an arrangement of atoms.</p> Signup and view all the answers

    What is the result of combining atoms in a fixed ratio?

    <p>A compound with unique properties.</p> Signup and view all the answers

    What is a characteristic of compounds that form crystal lattices?

    <p>They are made up of atoms arranged in a regular, repeating pattern.</p> Signup and view all the answers

    What is the ratio of atoms in a compound that determines its unique properties?

    <p>Fixed ratio of atoms.</p> Signup and view all the answers

    What is the term for a cluster of atoms bonded together in a specific manner?

    <p>Molecule.</p> Signup and view all the answers

    What determines the symbol of an element?

    <p>The first letter of the element's name</p> Signup and view all the answers

    What is the characteristic of elements in the same group?

    <p>They have similar electron configurations</p> Signup and view all the answers

    What is the reaction of sodium with water?

    <p>2Na + 2H₂O → 2NaOH + H₂</p> Signup and view all the answers

    What is the IUPAC naming system used for?

    <p>Standardizing names of compounds</p> Signup and view all the answers

    What is the prefix used to indicate two atoms of an element in a compound?

    <p>di-</p> Signup and view all the answers

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

    <p>Iron sulfide</p> Signup and view all the answers

    What is the characteristic of alkali metals?

    <p>They are soft, have a dull-gray appearance, and react vigorously with water</p> Signup and view all the answers

    What is the suffix used for the second element in a compound containing a metal and a non-metal?

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

    What determines the name of a compound containing only non-metals?

    <p>The element further to the left on the Periodic Table</p> Signup and view all the answers

    What is the result of the reaction of potassium with water?

    <p>Potassium hydroxide and hydrogen gas</p> Signup and view all the answers

    What is the primary function of chemical bonds in a compound?

    <p>To hold atoms together</p> Signup and view all the answers

    What do the subscripts in a chemical formula indicate?

    <p>The number of each type of atom in a molecule</p> Signup and view all the answers

    What is the purpose of the Periodic Table?

    <p>To organize elements in a systematic way</p> Signup and view all the answers

    How are elements arranged on the Periodic Table?

    <p>In order of increasing atomic number</p> Signup and view all the answers

    What is the characteristic of semi-metals on the Periodic Table?

    <p>They are typically solids at room temperature</p> Signup and view all the answers

    What is the purpose of chemical formulas?

    <p>To indicate the types and numbers of atoms in a molecule</p> Signup and view all the answers

    What is the typical arrangement of elements in a group on the Periodic Table?

    <p>In order of increasing atomic number</p> Signup and view all the answers

    What is the characteristic of metals on the Periodic Table?

    <p>They are shiny, ductile, and malleable</p> Signup and view all the answers

    What information is typically included on a tile on the Periodic Table?

    <p>The chemical symbol, atomic number, and atomic mass</p> Signup and view all the answers

    What is the rule for chemical symbols?

    <p>The symbol is usually the first one or two letters of the element's name</p> Signup and view all the answers

    What is the primary difference between molecules and crystal lattices?

    <p>The arrangement of atoms in a regular, repeating pattern</p> Signup and view all the answers

    Why do compounds have unique properties?

    <p>Due to the ratio of atoms in the compound</p> Signup and view all the answers

    What is the significance of the fixed ratio of atoms in a compound?

    <p>It determines the properties of the compound</p> Signup and view all the answers

    What is the characteristic of elements that naturally exist as diatomic molecules?

    <p>They consist of two atoms of the same element</p> Signup and view all the answers

    What is the result of combining atoms in a fixed ratio?

    <p>A compound with unique properties</p> Signup and view all the answers

    What determines the composition of a formula unit in a crystal lattice?

    <p>The ratio of atoms in the compound</p> Signup and view all the answers

    What is the primary characteristic of compounds that form crystal lattices?

    <p>They have a regular, repeating pattern of atoms</p> Signup and view all the answers

    What is the significance of the ratio of hydrogen to oxygen atoms in water (H₂O)?

    <p>It determines the properties of the compound</p> Signup and view all the answers

    What is the characteristic of elements that do not naturally exist as diatomic molecules?

    <p>They can exist as single atoms</p> Signup and view all the answers

    What determines the unique properties of a molecule?

    <p>The ratio of atoms in the molecule</p> Signup and view all the answers

    What is true about the symbols of elements?

    <p>The first letter is always uppercase, and the second letter is always lowercase.</p> Signup and view all the answers

    Which of the following is a characteristic of alkali metals?

    <p>They are soft and have a dull-gray appearance.</p> Signup and view all the answers

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

    <p>Lithium hydroxide</p> Signup and view all the answers

    What is the purpose of the IUPAC naming system?

    <p>To assign unique names to compounds.</p> Signup and view all the answers

    What is the suffix used for the second element in a compound containing a metal and a non-metal?

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

    What is the reaction of sodium with water?

    <p>It reacts vigorously to form sodium hydroxide and hydrogen gas.</p> Signup and view all the answers

    What is the characteristic of elements in the same group?

    <p>They have similar electron configurations and similar physical and chemical properties.</p> Signup and view all the answers

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

    <p>Potassium hydroxide</p> Signup and view all the answers

    What is the prefix used to indicate two atoms of an element in a compound?

    <p>di-</p> Signup and view all the answers

    What determines the unique properties of a compound?

    <p>The ratio of atoms in the compound.</p> Signup and view all the answers

    What is the primary function of chemical bonds in a compound?

    <p>To hold the atoms together in a stable molecule</p> Signup and view all the answers

    Which of the following is a characteristic of semi-metals?

    <p>They have properties of both metals and non-metals</p> Signup and view all the answers

    What is the purpose of the subscripts in a chemical formula?

    <p>To indicate the number of each type of atom in a molecule</p> Signup and view all the answers

    Which of the following is a characteristic of metals on the Periodic Table?

    <p>They are usually solids at room temperature</p> Signup and view all the answers

    What is the result of the rearrangement of atoms during a chemical reaction?

    <p>The formation of a new compound</p> Signup and view all the answers

    What is the arrangement of elements on the Periodic Table based on?

    <p>The atomic number of the elements</p> Signup and view all the answers

    What is the purpose of the Periodic Table?

    <p>To organize all known elements in a systematic way</p> Signup and view all the answers

    Which of the following is a characteristic of compounds that form crystal lattices?

    <p>They have a fixed ratio of atoms</p> Signup and view all the answers

    What is the difference between the chemical formulas of water and hydrogen peroxide?

    <p>The number of oxygen atoms</p> Signup and view all the answers

    What is the primary function of the chemical formula of a compound?

    <p>To represent the composition of the compound</p> Signup and view all the answers

    What is the primary difference between a molecule and a crystal lattice?

    <p>The arrangement of atoms in a repeating pattern</p> Signup and view all the answers

    Which of the following statements about compounds is true?

    <p>Compounds always have a fixed ratio of atoms</p> Signup and view all the answers

    What determines the unique properties of a compound?

    <p>The ratio of different elements present</p> Signup and view all the answers

    Which of the following elements naturally exists as a diatomic molecule?

    <p>Oxygen</p> Signup and view all the answers

    What is the purpose of the fixed ratio of atoms in a compound?

    <p>To determine the properties of the compound</p> Signup and view all the answers

    What is the IUPAC rule for naming compounds containing a metal and a non-metal?

    <p>The metal is named first, followed by the non-metal with the suffix '-ide'.</p> Signup and view all the answers

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

    <p>penta-</p> Signup and view all the answers

    What is the primary function of subscripts in a chemical formula?

    <p>To indicate the number of atoms of an element in a molecule</p> Signup and view all the answers

    What is the reaction of lithium with water?

    <p>Lithium reacts with water to form lithium hydroxide and hydrogen gas.</p> Signup and view all the answers

    How do elements in the same group on the Periodic Table differ?

    <p>They have the same number of valence electrons</p> Signup and view all the answers

    What is the naming rule for compounds containing only non-metals, when the element further to the left on the Periodic Table is named first?

    <p>The second element’s name is modified with the suffix '-ide'.</p> Signup and view all the answers

    What is the primary reason why compounds have unique properties?

    <p>The ratio of atoms in the compound</p> Signup and view all the answers

    What is the purpose of assigning unique names to compounds?

    <p>To avoid confusion and ensure precise communication.</p> Signup and view all the answers

    Why are chemical formulas essential in chemistry?

    <p>They represent the composition of a compound</p> Signup and view all the answers

    What is the purpose of the Periodic Table in chemistry?

    <p>To organize elements in order of increasing atomic number</p> Signup and view all the answers

    What is represented by the subscripts in a chemical formula?

    <p>The number of each type of atom in a molecule</p> Signup and view all the answers

    Which of the following is true about the Periodic Table?

    <p>Each element has a fixed position on the Periodic Table</p> Signup and view all the answers

    What is the primary purpose of a chemical formula?

    <p>To represent the composition of a compound</p> Signup and view all the answers

    Which of the following statements is true about chemical bonds?

    <p>Chemical bonds are attractive forces that bind atoms</p> Signup and view all the answers

    What can be inferred about an element based on its position on the Periodic Table?

    <p>Its classification as a metal, non-metal, or semi-metal</p> Signup and view all the answers

    What is the characteristic of molecules that distinguishes them from crystal lattices?

    <p>A fixed ratio of atoms</p> Signup and view all the answers

    Which of the following elements does NOT naturally exist as a diatomic molecule?

    <p>Copper</p> Signup and view all the answers

    What is the result of combining atoms in a fixed ratio?

    <p>A compound with unique properties</p> Signup and view all the answers

    What determines the unique properties of a compound?

    <p>The ratio of atoms present</p> Signup and view all the answers

    What is the characteristic of compounds that form crystal lattices?

    <p>A regular, repeating pattern of atoms</p> Signup and view all the answers

    What is the characteristic of elements in the same group?

    <p>They have similar physical and chemical properties</p> Signup and view all the answers

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

    <p>Sodium chloride</p> Signup and view all the answers

    What is the prefix used to indicate one atom of an element in a compound?

    <p>mono-</p> Signup and view all the answers

    What is the reaction of lithium with water?

    <p>It reacts vigorously to form lithium hydroxide and hydrogen gas</p> Signup and view all the answers

    What is the purpose of the IUPAC naming system?

    <p>To assign unique names to compounds to avoid confusion</p> Signup and view all the answers

    What is the characteristic of atoms in a compound?

    <p>They are combined in a fixed ratio</p> Signup and view all the answers

    What is the difference between molecules and crystal lattices?

    <p>Molecules are bonded together in a specific manner, while crystal lattices are arranged in a regular, repeating pattern</p> Signup and view all the answers

    What is the main purpose of a chemical formula?

    <p>To indicate the types and numbers of atoms in a molecule</p> Signup and view all the answers

    Where are non-metals typically found on the Periodic Table?

    <p>On the right-hand side</p> Signup and view all the answers

    What is the result of combining atoms in a fixed ratio?

    <p>A compound with unique properties</p> Signup and view all the answers

    What is the purpose of subscripts in a chemical formula?

    <p>To indicate the number of each type of atom in a molecule</p> Signup and view all the answers

    What is the characteristic of elements that naturally exist as diatomic molecules?

    <p>They are composed of two atoms of the same element</p> Signup and view all the answers

    What is the characteristic of semi-metals?

    <p>They have a variety of properties</p> Signup and view all the answers

    What is the term for the smallest repeating unit that represents the compound's composition in a crystal lattice?

    <p>Formula unit</p> Signup and view all the answers

    What determines the position of an element on the Periodic Table?

    <p>Its atomic number</p> Signup and view all the answers

    What is the characteristic of elements in the same group?

    <p>They have similar physical and chemical properties due to similar electron configurations</p> Signup and view all the answers

    What is the purpose of the IUPAC naming system?

    <p>To create unique names for compounds containing the same elements but in different ratios</p> Signup and view all the answers

    What is the suffix used for the second element in a compound containing a metal and a non-metal?

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

    What is the reaction of potassium with water?

    <p>It reacts violently with water to form potassium hydroxide and hydrogen gas</p> Signup and view all the answers

    What is the characteristic of compounds containing only non-metals?

    <p>They follow a specific set of rules for naming</p> Signup and view all the answers

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