Physical and Chemical Change

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include melting, freezing, and breaking.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. Examples include rusting, burning, and spoiling food.

Front

What happens to a substance during melting?

Back

During melting, a solid turns into a liquid when heat is applied, reaching its melting point.

Front

What happens to a substance during freezing?

Back

During freezing, a liquid turns into a solid when it loses heat, reaching its freezing point.

Front

What is the freezing point of water?

Back

The freezing point of water is 0 °C (32 °F). At this temperature, water changes from a liquid to a solid.

Front

What is the boiling point of water?

Back

The boiling point of water is 100 °C (212 °F). At this temperature, water changes from a liquid to a gas.

Front

Give an example of a physical change.

Back

An example of a physical change is ice melting into water.

Front

Give an example of a chemical change.

Back

An example of a chemical change is wood burning to form ash and smoke.

Front

What is needed for both boiling and melting to occur?

Back

Heat is needed for both boiling and melting to occur.

Front

What is an indicator of a chemical change?

Back

An indicator of a chemical change can include color change, gas production, or the formation of a precipitate.