Let’s Review: The Tools of Quantitative Chemistry
1. The SI unit of mass is the ________.
a) Newton
b) liter
c) kilogram
d) mole
e) ounce
Answer: c
2
The SI unit of temperature is the ________.
a) kelvin
b) calorie
c) fahrenheit
d) absolute zero scale
e) kilocalorie
Answer: a
3. Which method is correct for converting kelvin to Celsius?
5 C
a) T  C  = 
 T  K  + 32
 9K 
9 C
b) T  C  = 
 T  K  + 273.15
 5K 
5 C
c) T  C  =
 T  K  - 273.15
9K
1 C
d) T  C  =
 T  K  - 273.15
1K
1 C
e) T  C  =
 T  K  + 273.15
1K
Answer: d
4. The boiling point of liquid helium is -269 ºC. What is this temperature in kelvin?
a) 0.985 K
b) 1.01 K
c) 4 K
d) 29 K
e) 542 K
Answer: c
5. The temperature required to melt silver is 962 °C. What is this temperature in kelvin?
a) 664 K
b) 689 K
c) 962 K
d) 1235 K
e) 1260 K
Answer: d
6. Which of the following is the smallest volume?
a) 5.0 × 101 cm3 b) 0.50 dL
c) 0.50 mL
Answer: c
d) 5.0 × 103 uL
e) 5.0 × 10-2 L
The Tools of Quantitative Chemistry
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7. The radius of an aluminum atom is 0.143 nm. What is the radius in picometers?
a) 1.43  10-12 pm
b) 1.43  10-9 pm
c) 1.43  10-2 pm
d) 1.43  10-1 pm
e) 1.43  102 pm
Answer: e
8. The volume of space occupied by an oxygen atom is 1.2 × 10-30 m3. What is this volume in
units of pm3?
a) 1.2 × 10-66 pm b) 1.2 × 10-18 pm c) 1.2 × 10-6 pm d) 1.2 × 10-3 pm e) 1.2 × 106 pm
Answer: e
9. The volume of space occupied by a carbon atom is 1.9 × 10-3 nm3. What is the volume of a
carbon atom in cubic meters?
a) 1.9 × 10-30 m3 b) 1.9 × 10-21 m3 c) 1.9 × 10-12 m3 d) 1.9 × 106 m3 e) 1.9 × 1024 m3
Answer: a
10. A student uses a balance to determine the mass of an object as 12.28 grams. The correct mass
of the object is 12.45 grams. What is the percent error in the student’s mass determination?
a) 0.17%
b) 0.99%
c) 1.4%
d) 17%
e) 99%
Answer: c
11. Two students independently determine the volume of water delivered by a 10.00-mL pipet.
Each student takes 8 measurements, then computes the average volume delivered and the
standard deviation. The results are tabulated below.
Student A
Student B
Average
10.277 mL
10.0 mL
St. Dev.
±0.003 mL
±0.9 mL
Which statement best describes the results?
a) A: good precision, good accuracy. B: good precision, good accuracy.
b) A: good precision, poor accuracy. B: poor precision, good accuracy.
c) A: poor precision, good accuracy. B: good precision, poor accuracy.
d) A: poor precision, poor accuracy. B: good precision, good accuracy.
e) A: poor precision, poor accuracy. B: poor precision, poor accuracy.
Answer: b
The Tools of Quantitative Chemistry
12. Express 2.030 × 10-3 in standard notation.
a) 0.002030
b) 0.00203
c) 203000
11
d) 0.0203
e) 0.002
Answer: a
13. Convert 0.490 ng to grams and express the answer in scientific notation using the correct
number of significant figures.
a) 4.90 × 10-8 g b) 4.90 × 10-10 g c) 4.9 × 10-10 g
d) 0.490 × 10-8 g e) 0.490 × 10-10 g
Answer: b
14. What is the correct number of significant figures in 0.003040?
a) 2
b) 3
c) 4
d) 6
e) 7
Answer: c
15. Round 0.000680483 to 4 significant figures.
a) 0.000
b) 0.0007
c) 0.0006805
d) 0.00068048
e) 0.000680483
Answer: c
16. What is the correct answer to the following expression: (53 + 63)  0.17051? Carry out the
addition operation first.
a) 20
b) 2.2 × 102
c) 19.8
d) 19.78
e) 19.779
Answer: c
17. Light with a wavelength of 25 nm is in the x-ray region of the electromagnetic spectrum.
What is the wavelength of this light in meters?
a) 2.5 × 10-11 m b) 2.5 × 10-10 m c) 2.5 × 10-8 m
d) 2.5 × 10-7 m
e) 2.5 × 1010 m
Answer: c
18. The volume of an object is 6.31 × 10-2 m3. Calculate the volume in cubic feet. (2.54 cm =
1.00 inch, 12.0 inches = 1.00 foot)
a) 0.00179 ft3
b) 0.0133 ft3
c) 0.207 ft3
d) 2.23 ft3
e) 598 ft3
Answer: d
19. If the fuel efficiency of an automobile is 21 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) 3.4 km/L
b) 8.0 km/L
c) 8.9 km/L
d) 49 km/L
e) 1.2 × 102 km/L
Answer: c
The Tools of Quantitative Chemistry
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20. A barometer is filled with a cylindrical column of mercury that is 76.0 cm high and 1.000 cm
in diameter. If the density of mercury is 13.53 g/cm3, what is the mass of mercury in the
column?
a) 0.227 g
b) 4.41 g
c) 808 g
d) 1.03 × 103 g
e) 3.23 × 103 g
Answer: c