1. 1. What is the reaction between acid and alkalis called?
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2. What is the pH number of neutral?
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3. what type of acid is produced in the stomach?
4. State two reasons hydrochloric acid is produced in the stomach.
5. Acid + base
6. Acid + carbonate
7. What salt is made when hydrochloric acid is neutralised by sodium hydroxide?
8. What salt is made when nitric acid is neutralised by calcium oxide?
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9. Two use of chlorine are...
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10. What precautions should be taken when handling chlorine?
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2. 11. Define the term electrolysis _____________________________
12. The positive electrode is called the..
13. When sea water is decomposed what gas is formed at the anode?
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14. Water is decomposed in to which two gases?
15. The oxygen is formed at the __________ electrode, and the hydrogen is formed at the ________ electrode?
16. The negative electrode is called....
17. What substance decomposes in to hydrogen gas and chlorine gas?
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18. What colour is chlorine gas?
19. How much more hydrogen than oxygen is produced when water is decomposed?
20. What is the test for chlorine?
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3. 21. What is the test for oxygen? _____________________________
22. What is the test for hydrogen?
23. What are the uses for hydrogen?
24. Minerals which contain high amounts of metals are called ....
25. The cost of producing metals depends on what three factors?
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26. The two main methods of extracting metals are.....
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27. In chemical reduction, the ore is crushed and heated in the presence of which element?
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28. Haematite contains which metal?
29. Bauxite contains which metal??
30. Name two metals that can be extracted by chemical reduction.
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4. 31. Name two metals that have to be extracted by electrolysis.
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32. Oxidation reactions add.....
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33. Removing oxygen from a substance is called......
34. Iron oxide + carbon
35. State four common properties of metals
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36. The two properties of aluminium which make it suitable for aircraft components are
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37. Which metal has the best properties for making electrical wires?
38. The two main properties of copper are which make it suitable for wires are
39. Define the term alloy
40. Name a common alloy

5. 41. State the environmental advantages of recycling
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42. State the economic advantages of recycling