MCAT General Chemistry Question 112: Answer and Explanation
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Question: 112
7. The kinetic molecular theory states that:
- A. the average kinetic energy of a molecule of gas is directly proportional to the temperature of the gas in kelvin.
- B. collisions between gas molecules are inelastic.
- C. gas particles occupy discrete areas of space.
- D. all gas molecules have the same kinetic energy at the same temperature.
Correct Answer: A
Explanation:
The average kinetic energy is directly proportional to the temperature of a gas in kelvin. The kinetic molecular theory states that collisions between molecules are elastic and thus do not result in a loss of energy, eliminating choice (B). Gas particles are assumed to take up negligible space in kinetic molecular theory, eliminating choice (C). While the average kinetic energy of any gas as a whole is the same at a given temperature, the particles themselves have a distribution of speeds (as seen in the Maxwell-Boltzmann distribution curve), eliminating choice (D).