Calderglen High School

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

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

Name the three essential elements required for healthy plant growth 2 Name the three essential elements required for healthy plant growth answer Nitrogen (N) Phosphorus (P) Potassium (K) Calderglen High School

Calculate the percentage mass of nitrogen in NH4 NO3 answer Formula mass = 14 + 4 + 14 +(3x16) = 80 % N = 28/ 80 x 100 = 35% Calderglen High School

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

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

Calderglen High School 6 What negative effect can artificial fertilisers have on lochs and rivers? answer Make them lifeless Calderglen High School

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

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

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

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