2. eymmcl2003 1111 2222 3333 4444 5555 6666 7777 8888 9999 10 11 12 13 14 15 16 17 18 19 20 21

3. eymmcl2003 What has led to the need for more efficient food production? Increasing world population answer 1

4. eymmcl2003 Name the three essential elements required for healthy plant growth Nitrogen (N) Phosphorus (P) Potassium (K) 2 answer

5. eymmcl2003 nitrogen Calculate the percentage mass of nitrogen in NH 4 NO 3 Formula mass = 14 + 4 + 14 + (3x16) = 80 % N = 28/ 80 x 100 = 35% 3 answer

6. eymmcl2003 How are some plants able to convert nitrogen in the air into nitrogen compounds? They have bacteria in root nodules (These plants are called the legumes ie peas, beans & clover) 4 answer

7. eymmcl2003 Why are fertilisers added to the soil? To replace nutrients/essential elements /nitrogen, potassium or phosphorus 5 answer

8. eymmcl2003 What effect can artificial fertilisers have on lochs and rivers? Make them lifeless 6 answer

9. eymmcl2003 Which of the following compounds would be suitable fertilisers? Copper chloride, ammonium nitrate, calcium phosphate Ammonium nitrate - contains nitrogen / soluble Copper chloride - does not contain essential elements Calcium phosphate - is insoluble 7 answer

10. eymmcl2003 What happens to the nitrogen and oxygen in the air during a lightning storm? They join together to produce nitrogen dioxide which dissolves in water and when rain falls nitrogen is added to soil. 8 answer

11. eymmcl2003 Name the process which produced ammonia (NH 3 ) Haber Process 9 answer

12. eymmcl2003 Name the catalyst used in the Haber process? Iron 10 answer

13. eymmcl2003 Why is a high temperature not used in the Haber process? ? The ammonia produced decomposes back into hydrogen and nitrogen 11 answer

14. eymmcl2003 Name the two gases which react together in the Haber process Nitrogenhydrogen Nitrogen and hydrogen 12 answer

15. eymmcl2003 Name the two types of compounds which can be used to make ammonia in the lab. An ammonium compound and an alkali An ammonium compound and an alkali eg. Ammonium chloride and potassium hydroxide or ammonium carbonate and soda lime 13 answer

16. eymmcl2003 What colour does ammonia turn damp pH paper? Bluepurple Blue/purple (It is an alkaline substance) 14 answer

17. eymmcl2003 Describe the appearance of ammonia. Colourless gas, pungent smell. It is also soluble in water and turns damp pH paper/universal indicator blue 15 answer

18. eymmcl2003 Is nitrogen gas reactive or unreactive? unreactive 16 answer

19. eymmcl2003 Name the process which produces nitric acid. Ostwald process Ostwald process 17 answer

20. eymmcl2003 What is formed when nitrogen dioxide dissolves in water? Nitric acid Nitric acid 18 answer

21. eymmcl2003 Name the catalyst used in the Ostwald process. platinum 19 answer

22. eymmcl2003 What does the Ostwald process produce? Nitric acid - HNO 3 Nitric acid - HNO 3 20 answer

23. eymmcl2003 Explain why it is not necessary to continue to heat once the Ostwald process has started. exothermic The reaction is exothermic (Heat is released which can be used in the reaction) 21 answer