Physical and Chemical 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 dissolving.

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 cooking.

Front

How can you identify a physical change?

Back

You can identify a physical change if the substance's appearance changes but its chemical identity remains the same. No new substances are formed.

Front

How can you identify a chemical change?

Back

You can identify a chemical change if the substance undergoes a transformation that produces one or more new substances, often accompanied by color change, gas production, or temperature change.

Front

Is melting ice a chemical or physical change?

Back

Melting ice is a physical change.

Front

What happens to the molecules during a physical change?

Back

During a physical change, the arrangement of molecules may change, but the molecules themselves remain the same.

Front

What happens to the molecules during a chemical change?

Back

During a chemical change, the bonds between molecules break and new bonds form, resulting in the creation of new substances.

Front

Give an example of a chemical change.

Back

An example of a chemical change is copper metal turning green when it oxidizes.

Front

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

Back

A physical change does not create a new substance, while a chemical change results in the formation of one or more new substances.

Front

Is boiling water a chemical or physical change?

Back

Boiling water is a physical change.