Chem Unit Test Practice

Chemical or Physical Change? A saw cuts a log and creates sawdust.

• Chemical

• Physical

Chemical or Physical Change? Making CO₂ (gas) by mixing vinegar and baking soda.

• Chemical

• Physical

Chemical or Physical Change? Ice melts into a puddle

• Chemical

• Physical

Chemical or Physical Change? Two clear liquids are mixed then turn to a yellow solid.

• Chemical

• Physical

Chemical or Physical Change? Food is broken down and digested in the stomach.

• Chemical

• Physical

Which of the following is evidence of a chemical change?

• A new material is created

• Change in shape

• Change in state of matter

• Change in size

Which is NOT evidence that a chemical change has taken place?

• Formation of a precipitate when substances are mixed

• Change in temperature when substances are mixed

• Dissolving of solute when substances are mixed

• Formation of gas when substances are mixed

George’s bike rusts. This is caused by the __________.

• object reacting to heat

• object reacting to oxygen

• object reacting to cold

• object reacting to carbon dioxide

What is the pH of a substance that forms when acids and bases react?

• 1

• 4

• 7

• 10

Acids taste ________.

• sweet

• bitter

• sour

• salty