Understanding Physical and Chemical Changes

What is an example of a physical change?

• Metal rusting

• Baking a cake

• Cutting a piece of cloth

• Burning wood

Which of the following is a characteristic of a chemical change?

• It does not create a new substance

• It changes only the shape of a substance

• It may release gases

• It can be easily undone

What happens when water evaporates?

• It turns into a different substance

• It combines with another substance

• It changes from liquid to gas

• It cannot be turned back into water

Which of these is NOT a physical change?

• Wood turning into ash

• Water vapor condensing into liquid water

• Ice melting into water

• Dissolving sugar in water

What is true about physical changes?

• They always release heat

• They may change the state of a substance's matter

• They cannot be undone

• They form a new substance