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Test bank chapter (1)
Choose the correct answer
- The SI unit of time is the
a) hour b) second c) minute d) ampere
- The diameter of an atom is approximately 1 × 10 -7^ mm. What is this diameter when expressed in nanometers?
a) 1 × 10 -18^ nm b) 1 × 10 -15^ nm c) 1 × 10 -9^ nm d) 1 × 10 -1^ nm
- 6.0 km is how many micrometers?
a) 6.0 × 106 μm b) 1.7 × 10 -7^ μm c) 6.0 × 109 μm d) 1.7 × 10 -4^ μm
- The SI prefixes giga and micro represent, respectively:
a) 10 -9^ and 10-6. b) 106 and 10-3. c) 103 and 10-3. d) 109 and 10-6.
- Which of these quantities represents the largest mass?
a) 2.0 × 102 mg b) 0.0010 kg c) 1.0 × 105 μg d) 2.0 × 102 cg
- How many cubic centimeters are there in exactly one cubic meter?
a) 1 × 10 -6^ cm^3 b) 1 × 10 -3^ cm^3 c) 1 × 10 -2^ cm^3 d) 1 × 106 cm^3
7. Ammonia boils at -33.4°C. What temperature is this in °F?
a) -60.1°F b) -92.1°F c) -28.1°F d) +13.5°F
- Which of the following is not an SI base unit?
a) Kilometer b) Kilogram c) Second d) Kelvin
- Which of the following SI base units is not commonly used in chemistry?
a) kilogram b) kelvin c) candela d) mole
- Which of the following prefixes means 1/1000?
a) kilo b) deci c) centi d) milli
- Which of the following prefixes means 1000?
a) kilo b) deci c) centi d) milli
- Convert -77°F to kalvin?
a) 212.6 K b) -212.6 K c) -28.1 K d) +13.5 K
- The SI prefixes Tara and nano represent, respectively:
a) 10
6 and 10
3 and 10
d) 10
12 and 10
20. Which of these quantities represents the smallest mass?
a) 2.0 × 102 mg
b) 0.0010 kg
c) 1 ×××× 105 μμμμ g
d) 2.0 × 102 cg
- Express 7.5 ng as Tg
a) 7.5 X
- 21 Tg b) 75 X
24 Tg c) 0.75 Tg d) 7.5 X
21 Tg
- At what temperature does the numerical reading on a Fahrenheit thermometer equal that on a Celsius thermometer? a) 0 °F b) – 40°F c) 100 °F d) –32 °F
Explanation: since the temperature reading is the same so that mean °F = °C
? F = [°C × 9/5 ] + 32 °F
Let temperature = t
t = [t × 9/5 ] + 32 °F
t - 9/5 t = 32 °F
-4/5 t = 32 °F
t = - 40 °F = -40 °C
