Internal energy and absolute zero Quiz
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5 questions, one answer each
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1. A gas is heated from 300 K to 900 K. What happens to the mean kinetic energy of its molecules?
- A. It is multiplied by 3
- B. It is multiplied by 9
- C. It is multiplied by 1.7
- D. It is unchanged
2. What is 25 °C in kelvin?
- A. −248 K
- B. 248 K
- C. 298 K
- D. 25 K
3. What increases while water boils at constant temperature?
- A. Mean kinetic energy
- B. Potential energy of the molecules
- C. Temperature
- D. Density
4. Which statement about absolute zero is correct?
- A. Molecules have zero mass
- B. The substance has no molecules
- C. The molecules have minimum internal energy
- D. The pressure is highest
5. Gas at 10 °C is heated to 20 °C. What is the ratio of the mean kinetic energies?
- A. 2.0
- B. 1.04
- C. 0.5
- D. 1.00