Pretest Quiz
Chapter 18
(Check web site: more problems will be posted)
Name______
1. A container having a volume of 1.0 m3 holds 5.0 moles of helium gas at 50°C. If the helium behaves like an ideal gas, the average kinetic energy per molecule is
a. 6.7 ´ 10–20 J.
b. 1.0 ´ 10–21 J.
c. 1.0 ´ 10–20 J.
d. 6.7 ´ 10–21 J.
e. 1.3 ´ 10–20 J.
d
2. The average kinetic energy of a nitrogen molecule at room temperature (20°C) is
a. 2 ´ 10–21 J.
b. 4 ´ 10–21 J.
c. 6 ´ 10–21 J.
d. 8 ´ 10–21 J.
e. 1 ´ 10–20 J.
e
3. The average translational speed of a nitrogen molecule at room temperature (20°C) is approximately (in m/s)
a. 100.
b. 500.
c. 300.
d. 700.
e. 200.
b
4. The air in an automobile engine at 20°C is compressed from an initial pressure of 1.0 atm and a volume of 200 cm3 to a volume of 20 cm3. Find the temperature if the air behaves like an ideal gas (g = 1.4) and the compression is adiabatic.
a. 730°C
b. 460°C
c. 25°C
d. 50°C
e. 20°C
b
5. The average molecular translational kinetic energy of a molecule in an ideal gas is
a. kBT.
b. RT.
c. kBT.
d. RT.
e. kBT, where n = number of internal degrees of freedom.
a
6. The theorem of equipartition of energy states that the energy each degree of freedom contributes to each molecule in the system (an ideal gas) is
a. .
b. .
c. .
d. .
e. .
c
7. The specific heat at constant volume at 0°C of one mole of an ideal monatomic gas is
a. .
b. R.
c. .
d. 2R.
e. .
c
8. The internal energy of n moles of an ideal gas depends on
a. one state variable T.
b. two state variables T and V.
c. two state vartiables T and P.
d. three state variables T, P and V.
e. four variables R, T, P and V