Heating Curves & Phase Changes.

Front

What do heating curves show?

Back

Heating curves show the change in state of matter as heat is added.

Front

True or false: melting and freezing occur at the same temperature.

Back

True

Front

What does temperature measure in a system of particles?

Back

Temperature is a measure of particle speed (motion).

Front

What happens to particle speed when temperature is increasing?

Back

Particle speed (motion) must be increasing.

Front

Between which points on a heating curve is the temperature of the substance remaining constant?

Back

The temperature remains constant between points B-C and D-E.

Front

What is a phase change?

Back

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

Front

What is the melting point?

Back

The melting point is the temperature at which a solid becomes a liquid.

Front

What is the boiling point?

Back

The boiling point is the temperature at which a liquid becomes a gas.

Front

What happens during the phase change from solid to liquid?

Back

During the phase change from solid to liquid, heat is absorbed, and the temperature remains constant until the entire solid has melted.

Front

What is latent heat?

Back

Latent heat is the heat required to change the phase of a substance without changing its temperature.