Physical and Chemical Changes

Front

What is the Law of Conservation of Mass?

Back

Mass is never created or destroyed.

Front

Which of the following is NOT an example of a physical change?

Back

Sour milk.

Front

What is a physical change?

Back

A physical change changes the physical properties of an object, but does not create a new substance.

Front

What is a chemical change?

Back

A chemical change creates a new substance and cannot be undone.

Front

Is melting ice a physical or chemical change?

Back

Physical change.

Front

Is rusting iron a physical or chemical change?

Back

Chemical change.

Front

What happens to the mass of substances during a chemical reaction?

Back

The total mass remains the same before and after the reaction.

Front

What is an example of a physical change?

Back

Crumpling paper.

Front

What is an example of a chemical change?

Back

Baking a cake.

Front

Can physical changes be reversed?

Back

Yes, most physical changes can be reversed.