Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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| 1. | Which
one of the following is a homogeneous mixture? a. | baked beans | b. | sugar dissolved
in water | c. | chocolate chip ice cream | d. | chicken noodle
soup | e. | a jar of chunky
peanut butter | | |
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| 2. | Which
of the following is a heterogeneous mixture? a. | mortar (a mixture of calcium carbonate and
sand) | b. | gasoline | c. | antifreeze (a
mixture of water and ethylene glycol) | d. | sodium chloride dissolved in water | e. | the air trapped
inside a balloon (not including the balloon) | | |
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| 3. | A
pure substance composed of two or more different elements is a. | a homogeneous
mixture. | b. | a heterogeneous mixture. | c. | a
polyelement. | d. | an atom. | e. | a chemical
compound. | | |
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| 4. | A(n)
____ is a pure substance that is composed of only one type of atom. a. | element | b. | homogeneous mixture | c. | heterogeneous
mixture | d. | macroscopic particle | e. | particulate | | |
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| 5. | Which
term best describes carbon dioxide, CO2? a. | homogeneous
mixture | b. | heterogeneous mixture | c. | element | d. | chemical compound | e. | none of the
above | | |
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| 6. | All
of the following are examples of physical properties EXCEPT a. | the boiling
point of ethanol. | b. | the conductivity of aluminum wire. | c. | the frying of an
egg. | d. | the density of
neon gas. | e. | the melting point of gold. | | |
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| 7. | An
intensive property of a substance is a. | only visible with magnification. | b. | dependent on its
volume, but not its mass. | c. | independent of the amount present. | d. | dependent only
on its temperature. | e. | dependent only on its mass and
volume. | | |
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| 8. | The
density of acetic acid is 1.05 g/mL. What is the volume of 327 g of acetic acid? a. | 2.91
´ 10-3
mL | b. | 3.21
´ 10-3
mL | c. | 2.62
´ 102
mL | d. | 3.11
´ 102
mL | e. | 3.43
´ 102
mL | | |
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| 9. | You
can identify a metal by carefully determining its density. A 2.166 g piece of an unknown metal is
1.50 cm long, 0.550 cm wide, and 0.250 cm thick. What is a possible identity of the
element? a. | silver, 10.5
g/cm3 | b. | iridium, 22.4 g/cm3 | c. | platinum, 21.4
g/cm3 | d. | palladium, 12.0 g/cm3 | e. | none of the
above | | |
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| 10. | Which
of the following observations are examples of chemical changes to
aluminum?
1. | When aluminum reacts with hydrochloric acid, hydrogen gas is
evolved. | 2. | Aluminum melts
at 660 °C. | 3. | A cube of aluminum with a volume of 4.0 cm3 has a
mass of 10.8 g. | 4. | Aluminum is a good electrical
conductor. | | |
a. | 1
only | b. | 2
only | c. | 1 and
2 | d. | 3 and
4 | e. | 1, 2 and
4 | | |
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| 11. | Which
of the following is the greatest mass? a. | 2.3 ´ 109 pg | b. | 1.5 ´ 108
ng | c. | 6.6 ´ 105
mg | d. | 8.4 ´ 102 mg | e. | 3.0 ´ 10-1
g | | |
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| 12. | The
radius of a helium atom is 31 pm. What is the radius in nanometers? a. | 3.1 ´ 10-9
nm | b. | 3.1 ´ 10-6
nm | c. | 3.1 ´ 10-5
nm | d. | 3.1 ´ 10-3
nm | e. | 3.1 ´ 10-2
nm | | |
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| 13. | Two
electronic balances are tested using a standard weight. The true mass of the standard is 1.3111 g.
The results of 5 individual measurements on each balance are recorded
below.
| | Balance A | Balance
B | | | 0.8888
g | 1.3110 g | | | 0.9959
g | 1.3109 g | | | 1.1182
g | 1.3111 g | | | 1.0033
g | 1.3110 g | | | 0.9938
g | 1.3110 g | average mass = | 1.0000 g | 1.3110
g | | | |
Which statement
best describes the results? a. | A: good precision, good accuracy. B: good precision, good
accuracy. | b. | A: good precision, good accuracy. B: poor precision, poor
accuracy. | c. | A: poor precision, good accuracy. B: good precision, good
accuracy. | d. | A: poor precision, poor accuracy. B: good precision, good
accuracy. | e. | A: poor precision, poor accuracy. B: good precision, poor
accuracy. | | |
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| 14. | If
the fuel efficiency of an automobile is 27 miles per gallon, what is its fuel efficiency in
kilometers per liter? (1 km = 0.621 mile, 1.000 L = 1.057 quarts, 4 quarts = 1
gallon) a. | 11
km/L | b. | 14
km/L | c. | 17
km/L | d. | 63
km/L | e. | 180
km/L | | |
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| 15. | An
electronic balance is used to determine that a sample has a mass of 25.7171 g. If the balance's
precision is ±0.1 mg, what is the correct number of significant figures for this
measurement?
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| 16. | What
is the correct answer to the following expression: (72.61 - 68.59) ´ 18.76? Carry
out the subtraction operation first. a. | 7 ´ 101 | b. | 75 | c. | 75.4 | d. | 74.542 | e. | 75.5415 | | |
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| 17. | What
mass of zinc (in kg) is in a 3.50 kg roll of tin foil that is 92.5% tin and 7.5%
zinc? a. | 0.26
kg | b. | 0.47
kg | c. | 0.90
kg | d. | 2.1
kg | e. | 3.2
kg | | |
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| 18. | What
experimental method is used to precisely determine the exact masses of isotopes and their relative
abundances? a. | determination of
density by water displacement | b. | distillation | c. | bombardment by
alpha particles | d. | mass spectrometry | e. | electron
microscopy | | |
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