P.1 Phase Change Pre-Unit Test 2024-25

Front

What is a phase change?

Back

A phase change is a transition of matter from one state to another, such as solid to liquid or liquid to gas.

Front

What happens to the molecules of a substance during melting?

Back

During melting, the molecules gain energy, move faster, and overcome the forces holding them in a fixed position, transitioning from solid to liquid.

Front

What is the term for a substance changing from liquid to solid?

Back

Freezing.

Front

What is the term for a substance changing from solid to gas without becoming liquid first?

Back

Sublimation.

Front

What is the term for a substance changing from gas to liquid?

Back

Condensation.

Front

What is the relationship between temperature and the movement of molecules in a substance?

Back

As temperature increases, the movement of molecules increases; as temperature decreases, the movement slows down.

Front

What is the definition of 'phase' in the context of matter?

Back

A phase is a distinct form or state of matter, such as solid, liquid, or gas.

Front

What is an example of a phase change that occurs at room temperature?

Back

The evaporation of water.

Front

What is the significance of energy transfer in phase changes?

Back

Energy transfer is crucial in phase changes as it determines whether a substance will absorb or release energy, leading to a change in phase.

Front

What does it mean to 'refute' a claim?

Back

To refute a claim means to provide evidence or reasoning that contradicts or disproves the claim.