Physical Changes and Chemical Reactions

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 includes processes like burning, rusting, and baking.

Front

Is burning wood a physical or chemical change?

Back

Chemical change.

Front

What happens to the molecules during a physical change?

Back

The molecules may change their state or appearance, but their chemical structure remains the same.

Front

What happens to the molecules during a chemical change?

Back

The molecules rearrange to form new substances with different chemical properties.

Front

What is an example of a physical change?

Back

Melting ice into water.

Front

What is an example of a chemical change?

Back

Rust forming on iron.

Front

Is dissolving sugar in water a physical or chemical change?

Back

Physical change.

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 a firework explosion a physical or chemical change?

Back

Chemical change.