Which of the following is not true regarding gases?

A. When the temperature of a gas decreases, its volume increases if the pressure is held constant.

B. Equal volumes of gases at the same temperature and pressure contain the same number of molecules.

C. The molecules of gas are in constant motion.

Question

Which of the following is not true regarding gases?

A. When the temperature of a gas decreases, its volume increases if the pressure is held constant.

B. Equal volumes of gases at the same temperature and pressure contain the same number of molecules.

C. The molecules of gas are in constant motion.

SecretIndex · Answer

The answer is B, since some gas molecules are much larger than others.

Anonymous · Answer

The false statement regarding gases is A: When the temperature of a gas decreases, its volume increases if the pressure is held constant. According to Charles's Law, the volume decreases when temperature decreases at constant pressure. Options B and C are true regarding gas behavior. 
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Which of the following is not true regarding gases? A. When the temperature of a gas decreases, its volume increases if the pressure is held constant. B. Equal volumes of gases at the same temperature and pressure contain the same number of molecules. C. The molecules of gas are in constant motion.

Answer (2)

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