A garden centre sells three fertilisers, X, Y and Z.
The table shows the percentage by mass of three elements in each fertiliser.
| Fertiliser | Nitrogen (N) / % | Phosphorus (P) / % | Potassium (K) / % |
|---|---|---|---|
| X | 15 | 15 | 15 |
| Y | 35 | 0 | 0 |
| Z | 5 | 20 | 10 |
Give one reason why farmers add fertilisers to the soil.
Give the letter of the fertiliser that contains only one of the three elements.
Give the letter of the fertiliser that contains the greatest percentage by mass of phosphorus.
Calculate the mass of nitrogen in a 10 kg bag of fertiliser X.
Fertiliser Y is ammonium nitrate. Name the two substances that react together to make ammonium nitrate.
Ammonium sulfate is another fertiliser. Name the acid that reacts with ammonia to make ammonium sulfate.
43 exam-style questions on Edexcel GCSE Chemistry 6.3 Dynamic equilibria, covering 6.3.1 The Haber process as a reversible reaction, 6.3.2 Conditions and rate in industrial equilibria, and 6.3.3 Fertilisers and the preparation of ammonium sulfate. Each one has a worked solution and a mark scheme showing where the marks go.