1. Calderglen High School
Fertilisers
N3-4 1 2 3 4 5 6 7 8 9 10
Calderglen High School

2. Is nitrogen gas reactive or unreactive?1
Is nitrogen gas reactive or unreactive?
answer
unreactive
Calderglen High School

3. Name the three essential elements required for healthy plant growth2
Name the three essential elements required for healthy plant growth
answer
Nitrogen (N)
Phosphorus (P)
Potassium (K)
Calderglen High School

4. Calculate the percentage mass of nitrogen in NH4 NO3
answer
Formula mass = (3x16) = 80
% N = 28/ 80 x 100 = 35%
Calderglen High School

5. Describe the appearance of ammonia.4
Describe the appearance of ammonia.
answer
Colourless gas, pungent smell.
It is also soluble in water and turns damp pH paper/universal indicator blue
Calderglen High School

6. Why are fertilisers added to the soil?5
Why are fertilisers added to the soil?
answer
To replace nutrients/essential elements /nitrogen, potassium or phosphorus
Calderglen High School

7. Calderglen High School6
What negative effect can artificial fertilisers have on lochs and rivers?
answer
Make them lifeless
Calderglen High School

8. 7
Which of the following compounds would be suitable fertilisers? Copper chloride, ammonium nitrate, calcium phosphate
answer
(must have N, P or K AND be soluble in water)
Ammonium nitrate - contains nitrogen / soluble
Copper chloride - does not contain essential elements
Calcium phosphate - is insoluble
Calderglen High School

9. 8
Name the two types of compounds which can be used to make ammonia in the lab.
answer
An ammonium compound and an alkali
eg. Ammonium chloride and potassium hydroxide or
ammonium carbonate and soda lime
Calderglen High School

10. What colour does ammonia turn damp pH paper?9
What colour does ammonia turn damp pH paper?
answer
Blue/purple
(It is an alkaline substance)
Calderglen High School

11. Give an advantage of using fertlisers?10
Give an advantage of using fertlisers?
answer
Larger yield of crop.
Calderglen High School