Heating and Cooling Curves

Front

What does the heating curve indicate about heat energy?

Back

The heating curve indicates that heat energy is being added or absorbed.

Front

What is the boiling point of a substance given its heating curve?

Back

The boiling point of the substance is 110°C.

Front

What is the melting point of NaCl(s) when heated from 0°C?

Back

The melting point of NaCl(s) is 801°C.

Front

In which regions of the heating curve does the temperature increase?

Back

Temperature increases in Region 1, 3, & 5.

Front

In which region of the heating curve is the substance both a solid and a liquid?

Back

The substance is both a solid and a liquid in Region 2.

Front

Define a heating curve.

Back

A heating curve is a graphical representation of the temperature change of a substance as heat is added over time.

Front

What happens to the temperature during a phase change?

Back

During a phase change, the temperature remains constant while heat energy is added or removed.

Front

What is the significance of the plateau in a heating curve?

Back

The plateau indicates a phase change where the substance is absorbing heat without a change in temperature.

Front

What is the relationship between heat energy and temperature in a heating curve?

Back

As heat energy is added, the temperature of the substance increases until a phase change occurs.

Front

What occurs in Region 1 of a heating curve?

Back

In Region 1, the substance is in a solid state and its temperature increases as heat is added.