5. Fertilisers
(a) Nitrogen reacts with hydrogen to form ammonia - Edexcel - GCSE Chemistry - Question 5 - 2015 - Paper 1
Question 5
5. Fertilisers
(a) Nitrogen reacts with hydrogen to form ammonia.
(i) Which of these is the balanced equation for this reaction?
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Worked Solution & Example Answer:5. Fertilisers
(a) Nitrogen reacts with hydrogen to form ammonia - Edexcel - GCSE Chemistry - Question 5 - 2015 - Paper 1
Step 1
Which of these is the balanced equation for this reaction?
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Answer
The balanced equation for the reaction of nitrogen and hydrogen to form ammonia is:
ightarrow 2NH_3$$
This indicates that one molecule of nitrogen reacts with three molecules of hydrogen to produce two molecules of ammonia.
Step 2
State the meaning of the symbol ⇌ in an equation.
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Answer
The symbol ⇌ indicates that the reaction is reversible, meaning the reactants can form products, and the products can also reform the reactants. It signifies that the reaction can proceed in both directions.
Step 3
Use the information in the table to explain why urea might be the best fertiliser.
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Answer
Urea has the highest percentage by mass of nitrogen at 47%, which is crucial for plant growth. Nitrogen is a key nutrient that promotes growth and contributes to the healthy development of plants. A higher nitrogen content means that urea can enhance plant growth more effectively compared to ammonium nitrate and ammonium sulfate, making it a better option for fertilisation.
