Front

What is a phase change graph?

Back

A phase change graph is a visual representation that shows the changes in state of a substance as it is heated or cooled, illustrating temperature changes and phase transitions.

Front

What happens to the energy of a substance during a phase change?

Back

During a phase change, the energy of a substance either increases or decreases, depending on whether it is melting, boiling, freezing, or condensing.

Front

What is melting point?

Back

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

Front

What is boiling point?

Back

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

Front

What does it mean when a substance is gaining energy?

Back

When a substance is gaining energy, it is absorbing heat, which can lead to a phase change from solid to liquid (melting) or liquid to gas (boiling).

Front

What does it mean when a substance is losing energy?

Back

When a substance is losing energy, it is releasing heat, which can lead to a phase change from gas to liquid (condensation) or liquid to solid (freezing).

Front

What is the significance of flat sections on a phase change graph?

Back

Flat sections on a phase change graph indicate that the temperature of the substance remains constant while it is undergoing a phase change.

Front

What occurs between points B and C on a phase change graph?

Back

Between points B and C, the substance is gaining energy and changing from a solid to a liquid (melting).

Front

What occurs between points D and E on a phase change graph?

Back

Between points D and E, the substance is losing energy and changing from a gas to a liquid (condensation).

Front

At what temperature does water freeze?

Back

Water freezes at 0°C.