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. It involves a chemical reaction and changes the chemical composition of the substance. Examples include burning, rusting, and cooking.

Front

Is frying an egg a physical or chemical change?

Back

Chemical change.

Front

What is an example of a chemical change?

Back

Examples include burning wood, rusting iron, and cooking food.

Front

What is an example of a physical property?

Back

Color.

Front

Is a rusting bicycle a chemical or physical change?

Back

Chemical change.

Front

Is burning wood a chemical or physical change?

Back

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

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

What happens to the molecules during a physical change?

Back

The molecules may change their arrangement or state (solid, liquid, gas) but remain the same substance.