States of Matter and Gas Laws - Exam Preparation Guide

States of Matter and Gas Laws - Applications

Q. At constant temperature, what happens to the pressure of a gas if its volume is halved?

Solution

According to Boyle's Law, at constant temperature, pressure is inversely proportional to volume. Halving the volume doubles the pressure.

Correct Answer: A — Pressure doubles

Q. In a closed container, if the temperature of a gas is increased, what happens to its pressure?

Solution

According to Gay-Lussac's Law, at constant volume, the pressure of a gas is directly proportional to its temperature in Kelvin.

Correct Answer: B — Pressure increases

Q. In the context of gas laws, what does 'R' represent in the ideal gas equation?

Solution

'R' in the ideal gas equation PV = nRT represents the universal gas constant, which relates the energy scale to the temperature scale.

Correct Answer: A — Gas constant

Q. What happens to the volume of a gas when it is compressed at constant temperature?

Solution

According to Boyle's Law, at constant temperature, the volume of a gas decreases when the pressure increases due to compression.

Correct Answer: B — Volume decreases

Q. Which law describes the relationship between the volume and temperature of a gas at constant pressure?

Solution

Charles's Law states that the volume of a gas is directly proportional to its temperature (in Kelvin) at constant pressure.

Correct Answer: B — Charles's Law

Q. Which of the following gases behaves most ideally?

Solution

Noble gases behave most ideally because they have minimal intermolecular forces and occupy a larger volume relative to their number of moles.

Correct Answer: A — Noble gases

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