Chemistry Summative 2 Retake (Chemical Reactions and Synthetics)

1. Which of these is a chemical change?

• chopping wood into logs
• burning wood
• water boiling
• dissolving sugar into tea

3. Evidence that a chemical reaction occurs include(s)

• Atoms are rearranged to form something new.
• The substance undergoes a change in state.
• The substance's shape changes.
• all of the above

4. What happens to the atoms when a physical reaction occurs?

• Atoms are rearranged.
• Atoms disappear and come back later.
• Atoms are destroyed.
• Atoms remain the same.

Does this equation show a chemical reaction?

• Yes

• No

Does the picture show a physical or chemical change?

• Physical Change

• Chemical Change

7. Synthetic materials

• are created through chemical reactions.
• don't break down easily.
• can be helpful and harmful.
• all of the above

8. If an exothermic reaction produces heat, what is an endothermic reaction?

• a process that involves X-Men
• a process that absorbs heat
• a process that releases heat
• all of the above

9. Which is an example of a natural material?

• polyester
• plastic
• coal
• styrofoam

Give an example of a synthetic material.

What does the Law of Conservation of Mass state?

• No new substances can be made or destroyed

• No new compounds can be made or destroyed

• No new atoms can be made or destroyed

• Mass cannot be lost from a physical reaction