Internal energy and absolute zero Quiz
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5 questions, one answer each
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1. Which statement defines the internal energy of a system?
- A. The kinetic energy of the system as a whole
- B. The energy needed to raise its temperature by 1 K
- C. The mean kinetic energy of one molecule
- D. The sum of the random kinetic and potential energies of its molecules
2. A gas is heated from 27 °C to 127 °C. By what factor does the mean kinetic energy of its molecules increase?
- A. 4.7
- B. 1.3
- C. 1.0
- D. 0.75
3. What is true of the molecules at absolute zero?
- A. They have maximum potential energy
- B. They have no mass
- C. They have the minimum possible internal energy
- D. They have stopped existing
4. Water boils at 100 °C while energy is supplied. What increases?
- A. The potential energy of the molecules
- B. The mean kinetic energy of the molecules
- C. The temperature of the water
- D. The mass of the water
5. Two blocks of the same material are at 300 K. Block B has twice the mass of block A. Which statement is correct?
- A. B has twice the mean kinetic energy per molecule of A
- B. A and B have the same internal energy
- C. B has twice the internal energy of A, with the same mean kinetic energy per molecule
- D. A has the greater internal energy because it is smaller