1. What is the reaction between acid and alkalis called? _____________________________ 2. What is the pH number of neutral? _______________________________ 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? ____________________________ 9. Two use of chlorine are... __________________________ 10. What precautions should be taken when handling chlorine? _____________________________________________________________________________________________
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? _______________________________ 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? ________________________ 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? ______________________________________________________________
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? ____________________________________________________________________________________________________________________________ 26. The two main methods of extracting metals are..... _______________________________ 27. In chemical reduction, the ore is crushed and heated in the presence of which element? ________________________ 28. Haematite contains which metal? 29. Bauxite contains which metal?? 30. Name two metals that can be extracted by chemical reduction. ______________________________________________________________
31. Name two metals that have to be extracted by electrolysis. ______________________________________________________________ 32. Oxidation reactions add..... _____________________________ 33. Removing oxygen from a substance is called...... 34. Iron oxide + carbon 35. State four common properties of metals ____________________________________________________________________________________________________________________________ 36. The two properties of aluminium which make it suitable for aircraft components are _______________________________ 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
41. State the environmental advantages of recycling _____________________________________________________________________________________________ 42. State the economic advantages of recycling