Physical and Chemical Changes

Front

What is a chemical change?

Back

A process where a new substance is produced, often involving a chemical reaction.

Front

What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

Give an example of a chemical change.

Back

Wood burning in a fireplace.

Front

Give an example of a physical change.

Back

Ice cream melting in the sunshine.

Front

What happens to iron when it becomes rusty?

Back

It undergoes a chemical change due to a reaction with oxygen and moisture.

Front

What is rust?

Back

A chemical compound formed when iron reacts with oxygen and water.

Front

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

Back

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

Front

What is an example of a physical change in the kitchen?

Back

Chopping vegetables.

Front

What is an example of a chemical change in cooking?

Back

Baking a cake, where ingredients react to form a new product.

Front

What is the role of saliva in digestion?

Back

Saliva helps break down starches into sugars, which is a chemical change.