1. Fertilisers Nat 5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

2. What has led to the need for more efficient food production?
An increase in population.

3. Name three essential elements required for healthy plant growth?
Nitrogen N
Potassium P
Phosphors K

4. Calculate the percentage mass of nitrogen in NH4NO3.
Formula of nitrogen = 14
Formula of NH4NO = = (3x16) = 80
% = ( 28 / 80 ) x 100 = 35 %

5. How are some plants able to convert nitrogen in the air into nitrogen compounds?
These plants are called legumes and have bacteria in their root nodules that do this.
Examples are peas, beans and clover.

6. Why are fertilisers added to the soil?
To add nutrients and essential elements
( NITROGEN, POTASSIUM AND PHOSHRUS.)

7. What effect can artificial fertilisers have on rivers?
They make the rivers more acidic which can kill plant life or Eutrophication can occur.

8. Which of the following compounds is a suitable fertilisers?
Has no essential elements (NPK)
Is soluble
Is insoluble
Copper chloride
Ammonium nitrate
Calcium phosphate

9. What happens to the nitrogen and oxygen in the air during a lightening storm?
The nitrogen and oxygen join together to form nitrogen dioxide. This then dissolves in the rain adding nitrogen to the soil.

10. Name the process which produced ammonia ( NH3).
Haber

11. Name the catalyst used in the Haber process.
Iron

12. What colour does ammonia turn damp pH paper?
Blue/ purple it’s a alkali.

13. Describe the appearance of ammonia.
Ammonia is a colourless gas, with a pungent smell and is soluble in water.

14. Name the process which produced nitric acid .
Ostwald

15. Name the catalyst used in the Ostwald process.
Platinium

16. Explain why during the Ostwald process it is not necessary to continue to heat the reaction once the process has started?
The reaction is exothermic so heat is released which can be used in the reaction.

17. Nitrogen dioxide ( NO2) dissolves in water to form ….
Nitric acid