Chemical Changes Introduction

Are new substances formed in a physical change?

• Yes

• No

Answer explanation

No new substances are formed in physical changes. The glass may break, but it is still glass. The water may boil and change to gas, but it is still H₂O.

Are new substances formed in a chemical changes?

• Yes

• No

Answer explanation

New substances are formed in chemical changes.

The new substances are called products.

The reactants undergo a chemical change to form new products.

Is photosynthesis a physical or chemical change?

• Physical change

• Chemical change

Is boiling water a physical or chemical change?

• Physical change

• Chemical change

Is digestion of food a physical or chemical change?

• Physical change

• Chemical change

Is burning paper a physical or chemical change?

• Physical change

• Chemical change

Is crushing a can a physical or chemical change?

• Physical change

• Chemical change

Is dissolving sugar in water a physical or chemical change?

• physical change

• chemical change

Is cooking an egg a physical or chemical change?

• Physical change

• Chemical change

Is melting wax a physical or chemical change?

• Physical change

• Chemical change