The diagram shows molecules in a state of matter.

Question

Which statement best describes what will occur if enough thermal energy is removed from the system to cause a change in state?
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1 point
Captionless Image
Molecular energy will increase, and the substance will change from a liquid to a gas.
Molecular energy will increase, and the substance will change from a gas to a liquid.
Molecular energy will decrease, and the substance will change from a liquid to a gas.
Molecular energy will decrease, and the substance will change from a gas to a liquid.
When you heat a sample of a gas, what happens to the particles that make up that gas?
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1 point
They move faster and spread apart.
They move slower and become more dense.
They become much smaller and take up less space.
They become much larger and take up more space.

Answer 1

For the first question, the correct statement is:

Molecular energy will decrease, and the substance will change from a gas to a liquid.

When thermal energy is removed from a system, the molecular movement decreases, leading to a state change from gas to liquid (condensation).

For the second question, the correct answer is:

They move faster and spread apart.

When you heat a sample of gas, the particles gain energy, which increases their movement and causes them to spread apart, resulting in lower density.