Multiple Choice
Identify the letter of the choice that best completes
the statement or answers the question.
|
|
|
1.
|
Which
of the following elements exists as a diatomic molecule? a. | neon | c. | nitrogen | b. | lithium | d. | sulfur | | | | |
|
|
|
2.
|
What
is the mass in grams of 5.90 mol C H ? a. | 0.0512 g | c. | 389 g | b. | 19.4 g | d. | 673 g | | | | |
|
|
|
3.
|
What
is the number of moles in 432 g Ba(NO ) ? a. | 0.237 mol | c. | 1.65 mol | b. | 0.605 mol | d. | 3.66 mol | | | | |
|
|
|
4.
|
What
is the number of moles of beryllium atoms in 36 g of Be? a. | 0.25 mol | c. | 45.0 mol | b. | 4.0 mol | d. | 320 mol | | | | |
|
|
|
5.
|
A
skeleton equation does NOT show which of the following? a. | the correct formulas of the reactants and
products | b. | the reactants on
the left, the products on the right | c. | an arrow connecting the reactants to the
products | d. | the relative
amounts of reactants and products | | |
|
|
|
6.
|
What
are the coefficients that will balance the skeleton equation below?
a. | 1, 1, 2 | c. | 3, 1, 2 | b. | 1, 3, 3 | d. | 1, 3, 2 | | | | |
|
|
|
7.
|
When
the following equation is balanced, what is the coefficient for HCl?
Mg(s)  HCl(aq) 
MgCl (aq)  H (g)
|
|
|
8.
|
Chemical equations must be balanced to satisfy ____. a. | the law of definite
proportions | c. | the law of conservation of
mass | b. | the law of
multiple proportions | d. | Avogadro’s
principle | | | | |
|
|
|
9.
|
The
complete combustion of which of the following substances produces carbon dioxide and
water?
|
|
|
10.
|
If 1
egg and 1/3 cup of oil are needed for each bag of brownie mix, how many bags of brownie mix do you
need if you want to use up all 3 eggs and 1 cup of oil?
|
|
|
11.
|
In a
chemical reaction, the mass of the products ____. a. | is less than the mass of the
reactants | b. | is greater than
the mass of the reactants | c. | is equal to the mass of the
reactants | d. | has no
relationship to the mass of the reactants | | |
|
|
|
12.
|
The
first step in most stoichiometry problems is to ____. a. | add the coefficients of the
reagents | c. | convert given quantities to
volumes | b. | convert given
quantities to moles | d. | convert given
quantities to masses | | | | |
|
|
|
13.
|
How
many moles of glucose, C H O , can be
"burned" biologically when 10.0 mol of oxygen is available?
C H O (s) + 6O (g)  6CO (g) + 6H O(l) a. | 0.938 mol | c. | 53.3 mol | b. | 1.67 mol | d. | 60.0 mol | | | | |
|
|
|
14.
|
When
iron rusts in air, iron(III) oxide is produced. How many moles of oxygen react with 2.4 mol of iron
in the rusting reaction?
a. | 1.2 mol | c. | 2.4 mol | b. | 1.8 mol | d. | 3.2 mol | | | | |
|
|
|
15.
|
How
many grams of beryllium are needed to produce 36.0 g of hydrogen? (Assume an excess of
water.)
Be(s) + 2H O(l)  Be(OH) (aq) +
H (g) a. | 4.00 g | c. | 162 g | b. | 36.0 g | d. | 324 g | | | | |
|
|
|
16.
|
In a
particular reaction between copper metal and silver nitrate, 12.7 g Cu produced 38.1 g Ag. What is
the percent yield of silver in this reaction?
a. | 56.7% | c. | 88.2% | b. | 77.3% | d. | 176% | | | | |
|
|
|
17.
|
Standard conditions when working with gases are defined as ____. a. | 0 K and 101.3 kPa | c. | 0 C and 101.3
kPa | b. | 0 K and 1
kPa | d. | 0 C and 1
kPa | | | | |
|
|
|
18.
|
Which
states of matter can flow? a. | gases only | c. | gases and liquids only | b. | liquids only | d. | gases, liquids, and solids | | | | |
|
|
|
19.
|
What
happens to the temperature of a liquid as it evaporates? a. | It increases. | c. | It does not change. | b. | It decreases. | d. | The change cannot be determined. | | | | |
|
|
|
20.
|
What
happens to the rate of evaporation of a liquid as the liquid is cooled? a. | It increases. | c. | It does not change. | b. | It decreases. | d. | The change cannot be determined. | | | | |
|
|
|
21.
|
In a
dynamic equilibrium between the liquid state and the gas state, what is true about the rate of
evaporation? a. | It is greater
than the rate of condensation. | b. | It is less than the rate of
condensation. | c. | It is equal to
the rate of condensation. | d. | The rate of evaporation cannot be
determined. | | |
|
|
|
22.
|
Which
of the following is an example of a phase? a. | pressure | c. | temperature | b. | water vapor | d. | triple point | | | | |
|
|
|
23.
|
As the
temperature of the gas in a balloon decreases, which of the following occurs? a. | The volume of the balloon
increases. | b. | The average
kinetic energy of the gas decreases. | c. | The gas pressure inside the balloon
increases. | d. | all of the
above | | |
|
|
|
24.
|
The
volume of a gas is reduced from 4 L to 0.5 L while the temperature is held constant. How does the gas
pressure change? a. | It increases by a
factor of four. | c. | It increases by a factor of
eight. | b. | It decreases by a
factor of eight. | d. | It increases by a factor of
two. | | | | |
|
|
|
25.
|
If a
balloon is heated, what happens to the volume of the air in the balloon if the pressure is
constant? a. | It
increases. | c. | It decreases. | b. | It stays the same. | d. | The change cannot be predicted. | | | | |
|
|
|
26.
|
How is
the ideal gas law usually written? a. |  =
R | c. | PV =
nRT | b. |  = nR | d. | P =  | | | | |
|
|
|
27.
|
Alkanes are hydrocarbons that contain what type of bonds? a. | single covalent bonds only | c. | at least one triple bond | b. | at least one double bond | d. | ionic bonds | | | | |
|
|
|
28.
|
What
is the simplest alkane? a. | butane | c. | methane | b. | ethane | d. | pentane | | | | |
|
|
|
29.
|
Which
of the following is a condensed structural formula for propane? a. | C H | c. | | b. | | d. | | | | | |
|
|
|
30.
|
An
organic compound that contains only carbon and hydrogen and at least one carbon-carbon triple bond is
classified as an ____. a. | alkane | c. | alkyne | b. | alkene | d. | arene | | | | |
|
|
|
31.
|
Which
of the following is NOT a fraction obtained from crude oil? a. | ammonia | c. | gasoline | b. | natural gas | d. | kerosene | | | | |
|
|
|
32.
|
Esters
contribute which property to fruits? a. | odor | c. | texture | b. | color | d. | skin thickness | | | | |
|
|
|
33.
|
Boyle's law states that ____. a. | the volume of a gas varies inversely with
pressure | b. | the volume of a
gas varies directly with pressure | c. | the temperature of a gas varies inversely with
pressure | d. | the temperature
of a gas varies directly with pressure | | |
|
|
|
34.
|
Charles's law states that ____. a. | the pressure of a gas is inversely proportional to its
temperature in kelvins | b. | the volume of a gas is directly proportional to its
temperature in kelvins | c. | the pressure of a gas is directly proportional to its
temperature in kelvins | d. | the volume of a gas is inversely proportional to its
temperature in kelvins | | |
|
|
|
35.
|
A
sample of gas occupies 17 mL at –112 C. What volume does the
sample occupy at 70 C? (Remember to convert temperature to
Kelvin!) a. | 10.6
mL | c. | 36mL | b. | 27 mL | d. | 8.0mL | | | | |
|
|
|
36.
|
The
combined gas law relates which of the following? a. | pressure and volume only | c. | volume and temperature only | b. | temperature and pressure
only | d. | temperature, pressure, and
volume | | | | |
|
|
|
37.
|
Select
the correctly balance equation for the combustion of octane
(C8H18) a. | C8H18 +
16O2 à
8CO2 + 8H2O | c. | C8H18 +
25O2 à
8CO2 + 9H2O | b. | 2C8H18
+ 50O2
à 16CO2 +
18H2O | d. | C8H18
+ 25O2
à 8CO2 +
18H2O | | | | |
|
|
|
38.
|
For
the reaction below, how many moles of N2 are required to produce 10 moles of
NH3?
N2 + 3H2 à
2NH3
|
|
|
39.
|
What
is the mole ratio of carbon dioxide to glucose in the reaction below?
6CO2 +
6H2O à C6H12O6 +
6O2
|
|
|
40.
|
How
many single bonds are there in a molecule of methane, CH4?
|