Thermodynamics Quiz True or False

1. During a phase change, ______________. -> all the heat goes into changing the phase of matter and there is no change in temperature
2. What is the internal energy of 5 moles of an ideal gas at a temperature of 50 °C? -> 20131 J
3. Which of the following is not an assumption made by the kinetic theory of gases? -> The molecules lose energy when they interact with each other or with the walls of the container.
4. Which of the following statements about heat engines is correct? -> A heat engine can only have a Carnot efficiency of 1 if the temperature of the heat reservoir and the temperature of the cold reservoir are the same.
5. A gas is at a temperature of 237 K, has a volume of 20 × 10-3 m3, and the pressure of the gas is 5 × 105 Pa. If the pressure doubles, and the volume of the gas stays the same, by how much does the temperature change? -> 474 K
6. During isothermal expansion of a gas, ______________. -> work is done on the system
7. The work done during adiabatic expansion of a gas depends on ______________. -> the change in temperature and the number of moles of gas
8. The mass of a nitrogen molecule is 4.65 × 10-26 kg. On a hot summer day, when the temperature hits 40 °C, what is the root-mean-square velocity of nitrogen molecules in the air? ->
9. There are 3 × 105 Joules of heat transferred into a 50 kg of water. The specific heat capacity of water is . The same amount of heat is transferred into a 50 kg person. The specific heat capacity of the human body is . What is the difference in the increase in temperature between the water and the person? -> 1.45 × 1028 K in both cases
10. A heat engine draws 400 J from its hot reservoir and deposits 100 J into its cold reservoir. How much work is done by this engine? -> 500 J

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