- Which of the following is NOT a postulate of the kinetic molecular theory?
A) Gas molecules are in constant random motion.
B) Collisions between gas molecules are elastic.
C) There are strong intermolecular forces.
D) The volume of gas molecules is negligible compared to the volume of the container.
Answer: C) There are strong intermolecular forces.
Explanation: A key postulate of the kinetic molecular theory is that intermolecular forces are negligible for ideal gases.
- Which of the following statements is true regarding gas behavior at high pressures?
A) Gas molecules occupy no volume.
B) Intermolecular forces become negligible.
C) Gas behavior deviates from ideal conditions.
D) All gases behave identically.
Answer: C) Gas behavior deviates from ideal conditions.
Explanation: At high pressures, gas molecules are forced closer together, causing intermolecular forces and volume to become significant, leading to deviations from ideal behavior.
- What happens to the pressure of an ideal gas if the temperature is increased while the volume remains constant?
A) Pressure decreases.
B) Pressure remains constant.
C) Pressure increases.
D) Pressure becomes zero.
Answer: C) Pressure increases.
Explanation: According to Gay-Lussac’s Law, increasing the temperature of a gas at constant volume results in an increase in pressure.
- The process where a gas expands and does work on its surroundings is an example of:
A) Isothermal process.
B) Isobaric process.
C) Adiabatic process.
D) All of the above.
Answer: D) All of the above.
Explanation: All of these processes can involve a gas expanding and doing work, depending on specific conditions.
- The average kinetic energy of gas molecules is proportional to the absolute temperature. This relationship is described by:
A) Boyle’s Law.
B) Charles’s Law.
C) Ideal Gas Law.
D) Kinetic Molecular Theory.
Answer: D) Kinetic Molecular Theory.
Explanation: The Kinetic Molecular Theory posits that the average kinetic energy of gas molecules is directly proportional to the absolute temperature.
- Which of the following factors affects the speed of sound in a gas?
A) Temperature.
B) Pressure.
C) Molar mass.
D) All of the above.
Answer: D) All of the above.
Explanation: The speed of sound in a gas is influenced by temperature, pressure, and molar mass, with higher temperatures generally leading to faster sound speeds.
- The concept of “compressibility” refers to:
A) The ability of a gas to mix with another gas.
B) The ability of a gas to expand.
C) The degree to which a gas can be compressed.
D) The temperature dependence of a gas.
Answer: C) The degree to which a gas can be compressed.
Explanation: Compressibility indicates how much a gas can decrease in volume under pressure.
- What is the primary cause of gas pressure in a container?
A) Weight of the gas.
B) Gravity acting on the gas molecules.
C) Collisions of gas molecules with the walls of the container.
D) Temperature of the gas.
Answer: C) Collisions of gas molecules with the walls of the container.
Explanation: Pressure results from the force exerted by gas molecules colliding with the walls of their container.
- The average distance traveled by a molecule between collisions in a gas is known as:
A) Mean free path.
B) Collision frequency.
C) Diffusion rate.
D) Free expansion.
Answer: A) Mean free path.
Explanation: The mean free path is the average distance a molecule travels before colliding with another molecule.
- Which of the following best describes an isothermal process?
A) Temperature remains constant.
B) Pressure remains constant.
C) Volume remains constant.
D) Internal energy remains constant.
Answer: A) Temperature remains constant.
Explanation: In an isothermal process, the temperature of the system does not change even as the gas expands or compresses.
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