Physical and Chemical Changes for grade 5

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.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances.

Front

Can you give an example of a physical change?

Back

Melting ice is an example of a physical change.

Front

Can you give an example of a chemical change?

Back

Rusting of iron is an example of a chemical change.

Front

What are some indicators of a chemical change?

Back

Indicators include color change, temperature change, gas production, and the formation of a precipitate.

Front

Is dissolving sugar in water a physical or chemical change?

Back

Dissolving sugar in water is a physical change.

Front

Is burning wood a physical or chemical change?

Back

Burning wood is a chemical change.

Front

What happens to the molecules during a physical change?

Back

The molecules may change their arrangement but not their chemical structure.

Front

What happens to the molecules during a chemical change?

Back

The molecules rearrange to form new substances with different chemical properties.

Front

Are physical changes reversible?

Back

Many physical changes are reversible, such as freezing and melting.