Chapter 8 Practice Test

Front

What is the term for when molecules tend to pull towards each other at the surface of a liquid?

Back

Surface tension is the property of the surface of a liquid that allows it to resist an external force, due to the cohesive nature of its molecules.

Front

If the freezing point of a substance is 5 degrees C, what is its melting point?

Back

The melting point is also 5 degrees C, as freezing and melting occur at the same temperature for a given substance.

Front

What is the process called when water vapor turns into liquid water, such as the drops on a cold glass?

Back

Condensation is the process where water vapor in the air cools down and changes into liquid water.

Front

What is the phase change called when a solid becomes a liquid?

Back

Melting is the phase change where a solid turns into a liquid when heat is applied.

Front

What do we call anything that has mass and takes up space?

Back

Matter is defined as anything that has mass and occupies space.

Front

What is the term for the process of a liquid turning into a gas?

Back

Evaporation is the process where liquid turns into vapor or gas, usually when heat is applied.

Front

What is the phase change called when a liquid becomes a solid?

Back

Freezing is the phase change where a liquid turns into a solid as it loses heat.

Front

What is sublimation?

Back

Sublimation is the process where a solid changes directly into a gas without becoming a liquid first.

Front

What is the boiling point of water at sea level?

Back

The boiling point of water at sea level is 100 degrees C (212 degrees F).

Front

What happens to the molecules of a substance as it heats up?

Back

As a substance heats up, its molecules gain energy and move faster, which can lead to changes in state.