Heating & Cooling Curves Review

Front

What is the melting point of a substance?

Back

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

Front

What is the freezing point of a substance?

Back

The freezing point is the temperature at which a liquid becomes a solid at a given pressure.

Front

Describe the process occurring between letters D and E on a heating curve.

Back

The process occurring between letters D and E is evaporation, where a liquid turns into a gas.

Front

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

Back

Temperature increases in regions 1, 3, and 5 of the heating curve.

Front

What happens to temperature during a phase change?

Back

During a phase change, the temperature remains constant while the substance transitions from one state to another.

Front

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

Back

The plateau indicates a phase change where the temperature remains constant as the substance absorbs or releases heat.

Front

How does the heating curve of NaCl(s) differ from that of water?

Back

The heating curve of NaCl(s) has a higher melting point (801°C) compared to water (0°C) due to stronger ionic bonds.

Front

What is the relationship between heat and temperature during heating?

Back

Heat is the energy transferred to increase the temperature of a substance, while temperature is a measure of the average kinetic energy of its particles.

Front

What is the role of heat in the melting process?

Back

Heat is absorbed by the solid to break the intermolecular forces, allowing it to transition into a liquid.

Front

What is the difference between evaporation and boiling?

Back

Evaporation occurs at the surface of a liquid at any temperature, while boiling occurs throughout the liquid at a specific boiling point.