Chemical vs. 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 changing its chemical composition. Examples include melting, freezing, and blending.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. Examples include burning, rusting, and cooking.

Front

What happens when fruits are blended together?

Back

When fruits are blended together, it is a physical change because the fruits are still the same substances, just in a different form.

Front

What is an example of a physical change?

Back

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

Front

What is an example of a chemical change?

Back

An example of a chemical change is burning wood, which produces ash and smoke.

Front

What happens to gallium when it melts?

Back

When gallium melts, it changes from a solid to a liquid, but it remains gallium, which is a physical change.

Front

What sound does hydrogen make in a flame test?

Back

Hydrogen makes a 'pop' sound in a flame test.

Front

What gas is produced when candles burn out?

Back

When candles burn out, carbon dioxide is produced, which can cause the flame to go out.

Front

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

Back

A physical change does not create new substances, while a chemical change does.

Front

Can a physical change be reversed?

Back

Yes, many physical changes can be reversed, such as freezing and melting.