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. Examples include burning, rusting, and baking.

Front

What happens to ice when it melts?

Back

When ice melts, it undergoes a physical change from solid to liquid.

Front

If you mix 1 gram of salt with 50 grams of water, how many grams of matter will you have after the salt is completely dissolved?

Back

51 grams.

Front

Which type of change can be undone: chemical or physical?

Back

Physical change can be undone.

Front

What happens to wood when it is burned?

Back

When wood is burned, it undergoes a chemical change, producing ash, smoke, and gases.

Front

What is an example of a physical change?

Back

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

Front

What is an example of a chemical change?

Back

An example of a chemical change is baking a cake.

Front

Can a physical change be reversed?

Back

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

Front

Can a chemical change be reversed?

Back

Most chemical changes cannot be easily reversed.