Chapter 3.3 Fertilisers

Question 1

The three main nutrients that plants require to grow well are

Answer 1

nitrogen, phosphorus and potassium

Question 2

Ammonia (NH3) can be used as a fertilizer and also be used to make

Answer 2

fertilizers

Question 3

The Haber process produces ammonia by combining

Answer 3

nitrogen and hydrogen

Question 4

In the Haber process, elements are converted into ammonia by passing them over an

Answer 4

iron catalyst are a temperature of 400 degrees Celsius and a pressure of 200 atmospheres

Question 5

The Ostwald process involves passing

Answer 5

ammonia and air over a platinum catalyst at 800 degrees Celsius

Question 6

In the Ostwald process the nitrogen monoxide produced combines with

Answer 6

oxygen to from nitrogen dioxide which is converted into nitric acid by dissolving in water.

Question 7

Percentage composition calculations:

Answer 7

percentage composition = mass of element x 100
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formula mass