7. Fertilisers contain compounds that promote plant growth.
(a) (i) State the name of an element in these compounds that promotes plant growth.
(ii) Potassium nitr... show full transcript
Worked Solution & Example Answer:7. Fertilisers contain compounds that promote plant growth - Edexcel - GCSE Chemistry - Question 7 - 2019 - Paper 1
Step 1
(a) (i) State the name of an element in these compounds that promotes plant growth.
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Answer
One element that promotes plant growth is potassium.
Step 2
(a) (ii) Complete the balanced equation for this reaction.
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Answer
The balanced equation for the reaction between potassium hydroxide and nitric acid is:
ightarrow KNO₃ + H₂O $$
Step 3
(b) (i) Give the name of this type of reaction.
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Answer
This type of reaction is called a reversible reaction.
Step 4
(b) (ii) State the formula of a molecule of ammonia.
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Answer
The formula of a molecule of ammonia is NH₃.
Step 5
(b) (iii) State the overall trend in world ammonia production from 1945 to 2015.
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Answer
The overall trend in world ammonia production from 1945 to 2015 is an increase in production.
Step 6
(c) Give the name of the product formed in this fuel cell.
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Answer
The product formed in a hydrogen-oxygen fuel cell is water.
Step 7
(d) Describe in detail, using suitable apparatus, how this experiment should be carried out.
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Answer
To determine the volumes of ammonia solution and dilute sulfuric acid, the following apparatus should be used:
Pipette to measure out the ammonia solution (25 cm³).
Burette filled with dilute sulfuric acid.
Method:
Measure 25 cm³ of ammonia solution using the pipette and place it into a suitable container (e.g., conical flask).
Add a few drops of a suitable indicator, such as methyl orange, to the flask.
Place the flask under the burette containing dilute sulfuric acid.
Slowly add sulfuric acid from the burette to the ammonia solution while swirling the flask until the solution changes color, indicating neutralization.
Record the volume of sulfuric acid used.
Repeat the titration to get consistent results.
Preparation of Crystals:
After titration, the resulting ammonium sulfate solution should be transferred to an evaporating dish.
Heat gently to evaporate the water, allowing crystals to form.
Once dry crystals are obtained, they can be filtered out and left to cool, resulting in pure, dry ammonium sulfate crystals.
