an unknown gas is contained in a sealed container. over time, the gas is gradually cooled until it becomes a…

an unknown gas is contained in a sealed container. over time, the gas is gradually cooled until it becomes a solid. determine which three statements accurately describe the graphic representation of the cooling process. a the freezing point of the gas is 100°c. b it will take 140 minutes for the gas to completely solidify. c as the gas changes state, the intermolecular attraction of the molecules increases. d droplets of the gas will begin to condense on the sides of the container at 125°c. e as the temperature of the gas decreases over time, the kinetic energy of the molecules increase.

an unknown gas is contained in a sealed container. over time, the gas is gradually cooled until it becomes a solid. determine which three statements accurately describe the graphic representation of the cooling process. a the freezing point of the gas is 100°c. b it will take 140 minutes for the gas to completely solidify. c as the gas changes state, the intermolecular attraction of the molecules increases. d droplets of the gas will begin to condense on the sides of the container at 125°c. e as the temperature of the gas decreases over time, the kinetic energy of the molecules increase.

Answer

Explanation:

Step1: Analyze freezing - point

The flat - section of the graph represents the phase - change. The first flat section is at 100°C, which is the freezing point (or melting point in reverse) of the substance. So, statement A is correct.

Step2: Analyze solidification time

The gas is still in the process of changing state at 140 minutes and has not completely solidified yet. So, statement B is incorrect.

Step3: Analyze intermolecular forces

As a gas changes to a solid (or liquid first and then solid), the intermolecular attraction between the molecules increases. So, statement C is correct.

Step4: Analyze condensation

There is no indication from the graph or the problem statement that droplets will begin to condense at 125°C. The graph shows a continuous cooling process without any specific information about condensation at 125°C. So, statement D is incorrect.

Step5: Analyze kinetic energy

As the temperature of the gas decreases, the kinetic energy of the molecules decreases (since temperature is a measure of the average kinetic energy of molecules). So, statement E is incorrect.

Answer:

A. The freezing point of the gas is 100°C, C. As the gas changes state, the intermolecular attraction of the molecules increases.