Chemical and physical changes

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 boiling.

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 photosynthesis.

Front

Is melting ice a physical or chemical change?

Back

Melting ice is a physical change because it changes from solid to liquid but remains water.

Front

What happens to the matter in a physical change?

Back

In a physical change, the matter remains the same substance before and after the change.

Front

What happens to the matter in a chemical change?

Back

In a chemical change, the matter transforms into one or more different substances with new properties.

Front

Is boiling water a physical or chemical change?

Back

Boiling water is a physical change because it changes from liquid to gas but remains water.

Front

What is an example of a chemical change in plants?

Back

An example of a chemical change in plants is photosynthesis, where sunlight is converted into glucose.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change does not alter the chemical composition of a substance, while a chemical change results in new substances being formed.

Front

Can a physical change be reversed?

Back

Yes, many physical changes can be reversed, such as freezing and melting.

Front

Can a chemical change be reversed?

Back

Most chemical changes cannot be easily reversed, as they involve the formation of new substances.