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 digestion.

Front

What happens to the substance during a physical change?

Back

The substance remains the same at the molecular level; only its physical properties change.

Front

What happens to the substance during a chemical change?

Back

The original substances are transformed into one or more new substances with different properties.

Front

Give an example of a physical change.

Back

An example of a physical change is ice melting into water.

Front

Give an example of a chemical change.

Back

An example of a chemical change is iron rusting.

Front

What is rusting?

Back

Rusting is a chemical change that occurs when iron reacts with oxygen and moisture in the air, forming iron oxide.

Front

What is evaporation?

Back

Evaporation is a physical change where a liquid turns into a gas, such as water turning into vapor.

Front

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

Back

A physical change does not change the chemical composition of a substance, while a chemical change results in new substances being formed.

Front

What is an example of a reversible physical change?

Back

An example of a reversible physical change is freezing and melting of water.