2. An animal carries out respiration in order to....

3. Powdered wood charcoal (carbon) is mixed with copper oxide and heated strongly.
A red glow is seen to spread though the mixture. When the mixture has cooled a pink residue is seen.

The reaction above is an example of oxidation and reduction.

During this reaction, which chemical is being oxidised and which is being reduced?

4. When copper foil is heated with a roaring bunsen flame and it quickly turns black.
What is the name of the black chemical formed?

5. What is a PLACENTA?

6. What are your lungs for?
(note: none of the answers is 'breathing'!)

7. If a bar of chocolate is left in the sun what will happen to it?

8. how long does it take the moon to go round the earth?

9. Where are the female gametes (ovules) in a plant found?

10. Some copper foil is heated in a sealed test tube until the copper stops changing colour. What gas is the copper reacting with?

11. Lettuce ----> slug ------> thrush -------> fox

The third organism in any food chain will always be a

12. What process would be used to obtain the solvent from a solution?

13. Which part of our body consists mostly of nerve cells

14. In order to make a guitar string vibrate quicker what needs to be done to it?

15. helium is an example of an

16. What is the chemical formula for SALT (sodium chloride)?

17. Which of the following are examples of chemical changes

18. An acid would have what pH number?

19. What is the word equation for the thermal decomposition of copper carbonate

20. Which of the energy changes below represents that which takes place when a stone is dropped