1. Look at the graph below which shows the solubility of 3 substances in water at diferent temperatures
How is the solubility of substance B effected by temperature?

2. This diagram shows the water cycle Where does the energy come from that drives the water cycle?
 

 

3. Name a substance with a pH value more than pH7

4. Sam notices drops of water forming on the mirror when he was having a bath.

What name best describes these droplets?

5. About 20cm of magnesium ribbon is chopped up into 1cm lengths and placed in a crucible which is then weighed along with its lid.

The crucible is heated strongly and the lid gently raised avery few seconds.

When the reaction is over the crucible + contents + lid are all re-weighed

These are his results:

• Mass of empty crucible + lid  = 51.2g
• Mass of crucible + lid + magnesium (before heating) = 54.3g
• Mass of crucible + lid + contents (after heating) = 54.7g

 

What is the word equation for the reaction that takes place?
 

6. Is carbon dioxide a solid, liquid or gas?
(at normal room temperature)

8. What is the approximate number of elements?

9. What happens to sugar when you stir it into a cup of tea?

10. Ca is the symbol for which chemical element

11. Substances can be obtained from the ground and purified in a variety of ways.

Which common metal is exctracted by heating its ore to a high temperature with coke (carbon) in a blast furnace.

12. Which would be the best substance to neutralize some spilt hydrochloric acid?

13. Name a chemical that decomposes to form oxygen when it is heated

14. Which of the following is NOT a metal

15. When crystals of copper sulphate are heated strongly in a test tube they

16. Word equations for 4 different reactions are shown.
Which of them is an example of a neutralization reaction?

17. A liquid with a pH of 2 would be described as .....

18. What process would be used to obtain the solute from a solution?

19. What is the test for oxygen gas?

20. What colour is hydrated copper sulphate