Chemistry for Changing Times, 14e (Hill/McCreary)
Chapter 5 Chemical Accounting
5.1 Multiple Choice Questions
1) Which one of the following reactions is NOT balanced?
A) 2 CO + O2 → 2 CO2
B) 2 SO2 + O2 → 2 SO3
C) 2 KNO3 + 10 K → 5 K2O + N2
D) SF4 + 3 H2O → H2SO3 + 4 HF
2) When the equation below is balanced, the coefficient of aluminum chloride is:
AlCl3 + H2SO4 → Al2(SO4)3 + HCl
A) 2
B) 3
C) 1
D) 6
3) Octane (C8H18 ) reacts with oxygen (O2) to form carbon dioxide (CO2) and water (H2O). When the
equation below is balanced, the coefficient of octane is:
C8H18 + O2 → CO2 + H2O
A) 8
B) 25
C) 2
D) 16
4) Propane (C3H8 ) reacts with oxygen (O2) to form carbon dioxide (CO2) and water (H2O). When the
equation below is balanced, the coefficient of water is:
C3H8 + O2 → CO2 + H2O
A) 1
B) 4
C) 2
D) 3
5) When the equation below is balanced, the coefficient of copper is:
Zn + CuSO4 → ZnSO4 + Cu
A) 0
B) 1
C) 2
D) 3
6) When the equation below is balanced, the coefficient of silver is:
Cu + AgNO3 → Cu(NO3)2 + Ag
A) 0
B) 1
C) 2
D) 3
7) When the equation below is balanced, the coefficient of copper(II) nitrate is:
Cu + AgNO3 → Cu(NO3)2 + Ag
A) 0
B) 1
C) 2
D) 3
8) When the equation below is balanced, the coefficient of silver nitrate is:
Cu + AgNO3 → Cu(NO3)2 + Ag
A) 0
B) 1
C) 2
D) 3
9) When the equation below is balanced, the coefficient of oxygen is:
Fe + O2 → Fe2O3
A) 0
B) 1
C) 2
D) 3
10) When the equation below is balanced, the coefficient of the product is:
Fe + O2 → Fe2O3
A) 1
B) 2
C) 3
D) 4
11) When the equation below is balanced, the coefficient of the hydrogen cyanide, HCN, is:
NaCN + H2SO4 → Na2SO4 + HCN
A) 1
B) 2
C) 3
D) 4
12) When the equation below is balanced, the coefficient of sodium cyanide is:
NaCN + H2SO4 → Na2SO4 + HCN
A) 1
B) 2
C) 3
D) 4
13) When the equation below is balanced, the coefficient of sulfuric acid, H2SO4 is:
NaCN + H2SO4 → Na2SO4 + HCN
A) 1
B) 2
C) 3
D) 4
14) The following reaction is important in the removal of sulfur dioxide, a major source of acid rain, from
the smokestacks of coal burning power plants. When the equation below is balanced, the coefficient of
calcium oxide (commonly called “lime”) is:
CaO + SO2 + O2 → CaSO4
A) 1
B) 2
C) 3
D) 4
15) The following reaction is important in the removal of sulfur dioxide, a major source of acid rain, from
the smokestacks of coal burning power plants. When the equation below is balanced, the coefficient of
calcium sulfate (commonly called “gypsum”) is:
CaO + SO2 + O2 → CaSO4
A) 1
B) 2
C) 3
D) 4
16) The following reaction is important in the removal of sulfur dioxide, a major source of acid rain, from
the smokestacks of coal burning power plants. When the equation below is balanced, the coefficient of
oxygen is:
CaO + SO2 + O2 → CaSO4
A) 1
B) 2
C) 3
D) 4
17) Solid lithium hydride reacts with water to form aqueous lithium hydroxide and hydrogen gas. When
this equation is written and balanced, the coefficient of lithium hydride is
A) 1.
B) 2.
C) 3.
D) 4.
18) Tin was among the first metals used by humans. Elemental tin is produced by heating tin(IV) oxide,
the principal ore of tin, with carbon. The products of this reaction are tin and carbon dioxide. When the
equation is written and balanced, the coefficient of carbon is
A) 1.
B) 2.
C) 3.
D) 4.
19) Tin was among the first metals used by humans. Elemental tin is produced by heating tin(IV) oxide,
the principal ore of tin, with carbon. The products of this reaction are tin and carbon dioxide. When the
equation is written and balanced, the coefficient of tin is
A) 1.
B) 2.
C) 3.
D) 4.
20) Ammonia can be prepared by the reaction of magnesium nitride with water. The products are
ammonia and magnesium hydroxide. When the equation is written and balanced, the coefficient of
magnesium nitride is
A) 1.
B) 3.
C) 6.
D) 8.
21) Ammonia can be prepared by the reaction of magnesium nitride with water. The products are
ammonia and magnesium hydroxide. When the equation is written and balanced, the coefficient of
magnesium hydroxide is
A) 1.
B) 3.
C) 6.
D) 8.
22) Ammonia can be prepared by the reaction of magnesium nitride with water. The products are
ammonia and magnesium hydroxide. When the equation is written and balanced, the coefficient of
ammonia is
A) 1.
B) 2.
C) 3.
D) 6.
23) Ammonia can be prepared by the reaction of magnesium nitride with water. The products are
ammonia and magnesium hydroxide. When the equation is written and balanced, the coefficient of water
is
A) 1.
B) 2.
C) 3.
D) 6.
24) When oxygen, O2, is passed through an electrical spark (lightning is a good natural source of an
electrical spark), ozone, O3, is formed. When the equation is balanced, the coefficient of ozone is
A) 1.
B) 2.
C) 3.
D) 4.
25) When oxygen, O2, is passed through an electrical spark (lightning is a good natural source of an
electrical spark), ozone, O3, is formed. When the equation is balanced, the coefficient of oxygen is
A) 1.
B) 2.
C) 3.
D) 4.
26) The label which indicates that a substance is a gas is
A) (g)
B) (l)
C) (s)
D) (aq)
27) Consider the following equation: 2 Na + 2 H2O → 2 NaOH + H2
Identify the product(s) for this reaction.
A) Na
B) Na and H2O
C) NaOH
D) NaOH and H2
28) The total number of each type of atom must be the same on both sides of an equation in order to
satisfy the
A) Law of Combining Volumes.
B) Law of Conservation of Matter.
C) Law of Constant Composition.
D) Law of Multiple Proportions.
10
29) The observations that gaseous reactants combine to form gaseous products in volume ratios that are
simple whole numbers is most directly summarized by which of the following.
A) The Law of Conservation of Mass
B) The Law of Fixed Proportions
C) The Law of Multiple Proportions
D) The Law of Combining Volumes
30) When 5 liters of hydrogen gas and 2.5 liter of oxygen gas react to form water at a constant
temperature and pressure, how many liters of water vapor (steam) will be formed?
A) 2.5
B) 5
C) 3
D) .5
31) When 2 liter of nitrogen gas reacts with 6 liters of hydrogen gas at constant temperature and pressure,
how many liters of ammonia gas will be produced?
A) 2
B) 4
C) 6
D) 8
32) When 4 liters of nitrogen gas react with 6 liters of hydrogen gas at constant temperature and pressure,
how many liters of ammonia gas will be produced?
A) 4
B) 6
C) 8
D) 10
33) The explanation of the observations leading to the law of combining volumes is often called
11
“Avogadro’s hypothesis.” This explanation states that equal volumes of gases at the same temperature
and pressure have
A) the same number of molecules.
B) different numbers of molecules.
C) the same reactivity.
D) different energies.
34) A liter of solid carbon and a liter of oxygen gas at the same temperature and pressure react to produce
carbon dioxide. Using the law of combining volumes, how many liters of carbon dioxide will be
produced?
A) 1
B) 2
C) 3
D) The law of combining volumes applies only to reactions involving all gases.
35) Which of the following is correct, according to Avogadro’s hypothesis?
A) At 0°C and 1 atm pressure, equal volumes of gases contain equal masses.
B) At 0°C and 1 atm pressure, equal volumes of gases contain the same number of molecules.
C) At 0°C and 1 atm pressure, equal volumes of gases have the same density.
D) At 0°C and 1 atm pressure, 1 L of oxygen gas and 1 L of liquid water contain the same number of
molecules.
36) Gay-Lussac’s law of combining volumes states that the volumes of reactants and products are in small
whole-number ratios. Which of the following is NOT an assumption for the law of combining volumes?
A) The products and reactants must all be gases.
B) The products and reactants must all be at the same temperature.
C) The products and reactants must all be at the same pressure.
D) The products and reactants must all be gases or liquids.
37) In order for the law of combining volumes to apply, all of the following must be the same for all
reactants EXCEPT
A) the pressure must be the same.
B) the reactants must be liquids.
C) the temperature must be the same.
D) all reactants must be gases.
38) The law of combining volumes applies only to
A) gases.
B) liquids.
C) solids.
D) gases and liquids.
39) Avogadro’s number is
A) 6.02 × 1023
B) 6.02 × 10–23
C) 3.02 × 1026
D) 2.06 × 1032
40) Avogadro’s number is big. If you had 6.02 × 1023 dollars, and could spend it at 1 billion (109) dollars
per second for your entire life (≈ 75 years), what approximate percentage of your original money would
you have left?
A) 0%
B) 10%
C) 50%
D) ≈ 100%
41) Which of the following has the same number of atoms as 35.4 g of chlorine?
A) 35.4 g of germanium
B) 19 g of potassium
C) 12 g of carbon
D) 18 g of water
42) Which of the following does NOT contain Avogadro’s number of particles?
A) 1.0 mole of silver
B) 23 g of sodium
C) 6.02 × 1023 atoms of aluminum
D) 12 g of water
43) Which of the following contains Avogadro’s number of atoms?
A) 15.5 g of phosphorus
B) 39 g of potassium
C) 40 g of bromine
D) 100 g of mercury
44) The formula mass of CO2 is
A) 28 g/mole.
B) 28 u.
C) 44 g/mole.
D) 44 u.