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 changes in state (like melting or freezing) and changes in shape or size.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and the rearrangement of atoms. Examples include rusting, burning, and cooking.

Front

Is spoiling food a physical or chemical change?

Back

Chemical change.

Front

Is glass breaking a chemical or physical change?

Back

Physical change.

Front

What happens when milk and vinegar are mixed?

Back

A chemical change occurs, resulting in the formation of a precipitate.

Front

What is an example of a chemical change?

Back

Copper metal turning green.

Front

What is a precipitate?

Back

A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.

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

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

Many physical changes can be reversed (e.g., freezing and melting), but not all.