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
Phosphorus is an essential element in fertilizers that promotes plant growth.
Step 2
(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:
KOH+HNO3→KNO3+H2O
Step 3
(b) (i) Give the name of this type of reaction.
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Answer
This type of reaction is known as a reversible reaction.
Step 4
(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
(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
Gather the necessary apparatus:
A pipette to measure out 25 cm³ of ammonia solution.
A suitable container to mix solutions.
A burette to dispense dilute sulfuric acid.
A suitable indicator, like methyl orange, to signal the endpoint of the titration.
Setup the titration:
Fill the burette with dilute sulfuric acid and record the initial volume.
Add the ammonia solution to the container along with a few drops of the indicator.
Carry out the titration:
Slowly release sulfuric acid from the burette into the ammonia solution while continually swirling the mixture until a color change indicates that the endpoint has been reached.
Record the final volume of the sulfuric acid in the burette to determine the volume used.
Prepare the ammonium sulfate solution:
After the reaction between ammonia and sulfuric acid, heat the resulting solution to evaporate some water.
Obtain crystals:
Allow the solution to cool so that crystals form.
Filter the crystals and leave them to dry.
By following these steps, you can successfully prepare pure, dry ammonium sulfate crystals.
