7.3 Changes in Matter (3.3 CK-12)

Which of the following is a physical change?

• baking a cake

• lighting a match

• tying a shoelace

• burning a candle

After a chemical change has occurred, matter

• has less mass than before.

• is the same substance as before.

• has different chemical properties than before.

• all of the above

A sign that a chemical change has occurred is a change in

• color.

• shape.

• size.

• all of the above.

An example of a chemical change is

• cutting hair.

• washing hair.

• bleaching hair.

• none of the above

Matter cannot be created or destroyed according to the law of

• equal matter.

• change in matter.

• conservation of mass.

• volume and mass.

Making ice cubes with tap water is an example of a chemical change.

• False

• True

All changes in matter can be reversed.

• False

• True

Melting metal changes it into an entirely different substance.

• False

• True

The release of gas bubbles is a sign of a chemical change.

• True

• False

After a physical change, matter still has the same chemical properties.

• True

• False