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After the following equation is properly balanced, what is the coefficient in front of O2?
S8(s) + O2(g) ? SO3(g)
A) 2 B) 3 C) 8 D) 12 E) 16
33. After the following equation is properly balanced, what is the coefficient in front of O2(g)?
PbS(s) + O2(g) ? PbO(s) + SO2(g)
A) 1 B) 2 C) 3 D) 4 E) 6
34. When the equation shown is balanced properly, what is the coefficient in front of O2(g)?
C6H14(l) + O2(g) ? CO2(g) + H2O(g)
A) 6 B) 7 C) 9 D) 12 E) 19
35. When aqueous solutions of hydrochloric acid and sodium carbonate are mixed,
A)H2 gas is formed.D)a precipitate is formed.
B)CO2 gas is produced.E)no reaction occurs.
C)sodium metal is formed.
36. A reaction which has two elements as reactants and one compound as a product is:
A)a decomposition reaction.D)a double-displacement reaction.
B)a combination reaction.E)a combustion reaction.
C)a single-displacement reaction.
37. A reaction which has one element and one compound as reactants and one element and one compound as products is:
A)a decomposition reaction.D)a double-displacement reaction.
B)a combination reaction.E)a combustion reaction.
C)a single-displacement reaction.
38. A reaction which has one compound as a reactant and two elements as products is:
A)a decomposition reaction.D)a double-displacement reaction.
B)a combination reaction.E)a combustion reaction.
C)a single-displacement reaction.
39. A reaction which has two compounds as reactants and two compounds as products is:
A)a decomposition reaction.D)a double-displacement reaction.
B)a combination reaction.E)a combustion reaction.
C)a single-displacement reaction.
40. A solution of silver nitrate is mixed with a solution of sodium chloride, resulting in a precipitate of silver chloride and a solution of sodium nitrate. The class of this reaction is:
A)decomposition reaction.D)double-displacement reaction.
B)combination reaction.E)combustion reaction.
C)single-displacement reaction.
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