1. Which organelle is responsible for producing energy in the form of ATP in animal cells?

2. What is the force that opposes the motion of two surfaces sliding past each other?

3. Which of the following is a chemical change?

4. Which process in ecosystems converts solar energy into chemical energy?

5. What is the main form of energy transformation in a hydroelectric power station?

6. Which layer of the Earth is composed mainly of solid iron and nickel?

7. What should you do first if a chemical spills on your skin in a science laboratory?

8. Which cell structure controls the movement of substances in and out of the cell?

9. What is the SI unit of force?

10. Which of the following is a sign of a chemical reaction?