4.19 Science Review

What is matter?

• physical changes
• anything that takes up space
• chemical properties
• physical properties

Is "a glass of milk becoming sour" physical or chemical?

• Chemical change
• Physical change

Friction wears away the treads on a tire after miles of driving.  Physical or chemical change?

• Chemical change
• Physical change

Which of the following is a sign that a chemical reaction has occurred?

• change in shape
• melting
• formation of a gas
• dissolving

What characteristic defines all chemical changes?

• There is a change of state.
• Electricity is produced.
• A new material is formed.
• Bubbles are produced.