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SUMMARY OF EQUATIONS 5. “Atoms are neither created nor destroyed in a chemical reaction”
is a statement of the
10.1
a. law of definite proportions.
)
)(
( number of atoms b. law of conservation of mass.
atomic weight

% of
___ _ c. law of percent composition.
of element
of element
100% of
×

d. atomic theory.
=
formula weight of compound compound element
6. What products are formed from the complete reaction of
hydrocarbons or carbohydrates with oxygen?
a. CO 2 + H 2 O
KEY TERMS b. CO + H 2 O
c. CH 4 + CO 2
Avogadro’s number (p. 265)
d. CO 2 +H 2
chemical equation (p. 255)
7. In a redox reaction, reduction is defined as the
combination reaction (p. 260)
a. gain of electrons by an atom.
decomposition reaction (p. 261)
b. loss of mass of an atom.
empirical formula (p. 252)
c. loss of electrons by an atom.
formula weight (p. 253) d. gain of mass of an atom.
gram-atomic weight (p. 265)
8. In a redox reaction, oxidation is defined as the
gram-formula weight (p. 265) a. gain of electrons by an atom.
gram-molecular weight (p. 265) b. loss of mass of an atom.
ion exchange reaction (p. 262) c. loss of electrons by an atom.
law of conservation of mass (p. 256) d. gain of mass of an atom.
mole (p. 265) 9. To what chemical reaction class does this reaction belong?
molecular formula (p. 252) CaCO 3 (s) CaO(s) + CO 2 (g)
molecular weight (p. 253) a. Combination
oxidation-reduction reaction (p. 260) b. Ion exchange
oxidizing agents (p. 260) c. Decomposition
d. Replacement
redox reaction (p. 260)
reducing agent (p. 260) 10. To what chemical reaction class does this reaction belong?
replacement reaction (p. 261) 2 Mg(s) + O 2 (g) 2 MgO(s)
a. Combination
b. Ion exchange
c. Decomposition
APPLYING THE CONCEPTS d. Replacement
11. Substances that take electrons from other substances are called
1. An empirical formula does not a. oxidizing agents.
a. identify elements in a compound. b. reducing agents.
b. identify actual numbers of atoms in a molecule. c. ions.
c. provide the simplest whole number ratio of atoms of elements d. compounds.
with subscripts. 12. Which is the most active metal?
d. provide the formula for an ionic compound.
a. silver
2. The relative arrangement of the atoms in a molecule is a (an) b. lead
a. empirical formula. c. zinc
b. structural formula. d. sodium
c. molecular formula. 13. A solid that comes out of solution as a result of an ion exchange
d. covalent formula.
reaction is called a
3. The sum of the atomic weights of all atoms in the ammonia a. precipitate.
molecule, NH 3 , is called b. contaminant.
a. molecular weight. c. base.
b. gravity weight. d. metal.
c. periodic weight. 14. A balanced chemical equation provides quantitative information
d. percent weight.
about all of the following except
4. What is the meaning of the subscripts in a chemical formula? a. time of reaction.
a. Number of atoms of an element in a compound b. atoms.
b. Percent composition of that element in a compound c. molecules.
c. Number of molecules of that compound d. atomic weights of reactants and products.
d. Number of molecules in the reaction
10-19 CHAPTER 10 Chemical Reactions 269