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5. What determines the chemical properties of an atom? 16. Pure substances that cannot be broken down into anything
a. Valence electrons simpler are
b. Atomic weight a. elements.
c. Neutrons and protons b. compounds.
d. Protons only c. molecules.
6. “Atoms attempt to acquire an outer orbital with eight electrons” d. mixtures.
is a statement of the 17. Chemical energy is defined as
a. Heisenberg certainty theory. a. change of internal potential energy during a chemical
b. atomic theory. reaction.
c. octet rule. b. energy that is only absorbed during a chemical reaction.
d. chemical energy balancing rule. c. energy that is only released during a chemical reaction.
7. The family or group number of the representative elements d. energy added to a chemical reaction.
represents the 18. A metallic bond is defined by all of the following, except
a. total number of electrons. a. it is formed in solid metals.
b. total number of protons. b. it restricts movement of electrons.
c. total number of valence electrons. c. metal atoms share a “sea of electrons.”
d. atomic number. d. it accounts for metallic properties such as conductivity and
8. What is the chemical symbol for a magnesium ion? luster.
+
a. Mg 19. An ion can be described as an element or compound that
–
b. Mg a. gains electrons.
2+
c. Mg b. loses electrons.
2–
d. Mg c. gains or loses electrons.
9. Atoms that achieve an octet by sharing electrons form d. shares electrons.
a. covalent bonds. 20. You know that a chemical reaction is taking place if
b. ionic bonds. a. the temperature of a substance increases.
c. metallic bonds. b. electrons move in a steady current.
d. hydrogen bonds. c. chemical bonds are formed or broken.
10. The electrostatic attraction between positive and negative ions is d. All of the above are correct.
called a (an) 21. What is the relationship between the energy released in burning
a. ionic bond. materials produced by photosynthesis and the solar energy that
b. metallic bond. was absorbed in making the materials? The energy released is
c. covalent bond. a. less than the solar energy absorbed.
d. electrostatic bond. b. the same as the solar energy absorbed.
11. The energy released during the formation of an ionic bond is c. more than the solar energy absorbed.
a. ionic energy. d. variable, having no relationship to the energy absorbed.
b. heat of formation. 22. The electrons that participate in chemical bonding are the
c. activation energy. a. valence electrons.
d. heat of creation. b. electrons in fully occupied orbitals.
12. The comparative ability of atoms of an element to attract c. stable inner electrons.
bonding electrons is called d. All of the above are correct.
a. electron attraction. 23. Atoms of the representative elements have a tendency to seek
b. electronegativity. stability through
c. bonding. a. acquiring the hydrogen gas structure.
d. electron transfer. b. filling or emptying their outer orbitals.
13. What kind of bond has unequal sharing of bonding electrons? c. any situations that will fill all orbitals.
a. Polar covalent d. All of the above are correct.
b. Covalent 24. An ion is formed when an atom of a representative element
c. Ionic a. gains or loses protons.
d. Polar ionic b. shares electrons to achieve stability.
14. The correct name for the compound CS 2 is c. loses or gains electrons to satisfy the octet rule.
a. dicarbon disulfide. d. All of the above are correct.
b. carbon disulfite. 25. An atom of an element in family VIA will have what charge
c. carbon disulfide. when it is ionized?
d. monocarbon trisulfide. a. +1
15. What is the formula for the compound zinc chloride? b. – 1
a. ZnCl c. +2
b. Zn 2 Cl d. – 2
c. ZnCl 2
d. ZnCl 4

9-19 CHAPTER 9 Chemical Bonds 247