Chemical and Physical Changes

Front

What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances that cannot be easily reversed.

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, and it can often be reversed.

Front

Give an example of a chemical change.

Back

Baking a cake is an example of a chemical change because it creates new substances that cannot be reversed.

Front

Give an example of a physical change.

Back

Melting ice is an example of a physical change because the ice can be frozen again.

Front

What happens during a chemical change?

Back

During a chemical change, the bonds between atoms are broken and new bonds are formed, resulting in new substances.

Front

What happens during a physical change?

Back

During a physical change, the form of a substance changes, but its chemical identity remains the same.

Front

Can chemical changes be reversed?

Back

Chemical changes usually cannot be reversed easily, as new substances are formed.

Front

Can physical changes be reversed?

Back

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

Front

What is an example of a physical change involving water?

Back

Freezing water into ice is an example of a physical change.

Front

What is an example of a chemical change involving paper?

Back

Burning paper is an example of a chemical change because it creates ash and smoke, which are new substances.