Integrated Chemistry: Heating and Cooling Curves

Front

What is the melting point of a substance?

Back

The temperature at which a solid becomes a liquid.

Front

What is the boiling point of a substance?

Back

The temperature at which a liquid becomes a gas.

Front

In which region of a heating curve is a substance a solid?

Back

Region 1.

Front

In which region of a heating curve is a substance a liquid?

Back

Region 3.

Front

In which region of a heating curve is a substance a gas?

Back

Region 5.

Front

What is the process called when a solid gains energy and changes to a liquid?

Back

Melting.

Front

What is the process called when a liquid gains energy and changes to a gas?

Back

Evaporation.

Front

What happens during a phase change?

Back

The temperature remains constant while the substance changes state.

Front

What is the significance of the flat regions on a heating curve?

Back

They indicate phase changes where temperature does not change.

Front

What occurs in Region 2 of a heating curve?

Back

The substance is melting.