Heating & Cooling Curves Review

Front

What is a heating curve?

Back

A heating curve is a graphical representation that shows the change in temperature of a substance as it is heated over time, illustrating phase changes such as melting and boiling.

Front

What is the melting point of NaCl?

Back

801°C

Front

Which line segment on a heating curve indicates a phase change from solid to liquid?

Back

The line segment BC indicates that water is found in both the solid and liquid phase at the same time.

Front

What is evaporation?

Back

Evaporation is the process where a liquid turns into a gas.

Front

What is the melting point of a substance?

Back

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

Front

Which region of a heating curve indicates that a substance is both a liquid and a gas?

Back

Region 4 indicates that the substance is a liquid and a gas at the same time.

Front

What happens during the phase change from solid to liquid?

Back

During this phase change, the solid absorbs heat energy, causing its temperature to rise until it reaches the melting point.

Front

What is the boiling point of water?

Back

The boiling point of water is 100°C at standard atmospheric pressure.

Front

What does the flat portion of a heating curve represent?

Back

The flat portion of a heating curve represents a phase change where temperature remains constant while the substance changes from one phase to another.

Front

What is the difference between boiling and evaporation?

Back

Boiling occurs at a specific temperature throughout the liquid, while evaporation can occur at any temperature and only at the surface of the liquid.