An example of a physical change.
a. Foam and bubbles form after mixing baking soda and vinegar.
b. A glass cup falls from the counter and shatters on the ground.
c. Paper burns up and leaves ashes.
d. A plant uses sunlight and makes food.
Which is true about chemical change?
a. It is reversible.
b. It produces new materials.
c. It changes only a material’s color and odor.
d. It does not change a material’s size and shape.
An example of a chemical change is
a. an old car rusting c. throwing a rock
b. cutting a piece of paper d. crushing a can
Which shows a chemical change?
a. Burning candle c. Burning a piece or paper
b. Chewing a piece of bread d. Melting a piece of chocolate

It is the primary cause of rust because it contains oxygen.
a. carbon dioxide b. water c. air d. hydrogen