Physical and Chemical Changes

Front

What is a chemical change?

Back

A process where substances combine or break apart to form new substances, often accompanied by energy changes, color changes, fizzing, or the production of gas.

Front

What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition, such as changes in state, shape, or size.

Front

Give an example of a chemical change.

Back

Burning wood, rusting iron, or souring milk.

Front

Give an example of a physical change.

Back

Melting ice, boiling water, or breaking a glass.

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 the formation of new substances.

Front

Is dissolving sugar in water a physical or chemical change?

Back

Physical change.

Front

What happens to the molecules during a chemical change?

Back

The molecules rearrange to form new substances with different properties.

Front

What is an indicator of a chemical change?

Back

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

Front

Is crumpling paper a physical or chemical change?

Back

Physical change.

Front

Is sour milk an example of a physical change?

Back

No, it is a chemical change.