Phase Changes - Heating & Cooling Curves

Front

What is a phase change?

Back

A phase change is a transition of matter from one state (solid, liquid, gas) to another due to the addition or removal of heat.

Front

What is a heating curve?

Back

A heating curve is a graph that shows the temperature change of a substance as it is heated over time, illustrating phase changes.

Front

What is a cooling curve?

Back

A cooling curve is a graph that shows the temperature change of a substance as it cools over time, illustrating phase changes.

Front

What happens during melting?

Back

During melting, a solid absorbs heat and changes into a liquid at its melting point.

Front

What happens during freezing?

Back

During freezing, a liquid loses heat and changes into a solid at its freezing point.

Front

What is latent heat of fusion (ΔHfus)?

Back

Latent heat of fusion is the amount of heat energy required to change a substance from solid to liquid at its melting point without changing its temperature.

Front

What is latent heat of vaporization (ΔHvap)?

Back

Latent heat of vaporization is the amount of heat energy required to change a substance from liquid to gas at its boiling point without changing its temperature.

Front

What is the boiling point?

Back

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

Front

What is the melting point?

Back

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

Front

In which region of a heating curve does a substance exist as a solid?

Back

Region 1 of the heating curve.