8.5E - Chemical and Physical 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 molecular structure of the substances involved.

Front

Is melting butter for popcorn a chemical or physical change?

Back

Physical change.

Front

Is burning wood a chemical or physical change?

Back

Chemical change.

Front

What are indicators of a chemical change?

Back

Indicators of a chemical change include color change, gas production (bubbles), temperature change, and the formation of a precipitate.

Front

What is an example of a physical change?

Back

Getting a haircut is an example of a physical change.

Front

What happens to the properties of substances during a chemical change?

Back

The properties of substances change during a chemical change, resulting in new substances with different properties.

Front

What is an example of a chemical change?

Back

Rusting of iron is an example of a chemical change.

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

Can a chemical change be reversed?

Back

Most chemical changes are not easily reversible, unlike physical changes which can often be reversed.