7. Fertilisers contain compounds that promote plant growth.
(i) State the name of an element in these compounds that promotes plant growth.
(ii) Potassium nitrate ... 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
State the name of an element in these compounds that promotes plant growth.
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Answer
Phosphorus is an essential element in many fertilizers that promotes plant growth.
Step 2
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 ext{KNO}_3 + ext{H}_2 ext{O}$$
Step 3
Give the name of this type of reaction.
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Answer
This type of reaction is called a reversible reaction.
Step 4
State the formula of a molecule of ammonia.
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Answer
The formula of a molecule of ammonia is NH3.
Step 5
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 shows a significant increase, steadily rising year by year.
Step 6
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
Describe in detail, using suitable apparatus, how this experiment should be carried out.
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Answer
To prepare pure, dry ammonium sulfate crystals, follow these steps:
Apparatus Needed:
A pipette to measure the ammonia solution (25 cm³)
A suitable container (e.g., beaker)
A burette with dilute sulfuric acid
A few drops of methyl orange indicator
Titration Process:
Fill the burette with dilute sulfuric acid and record the initial volume.
Measure 25 cm³ of ammonia solution using the pipette and transfer it to the container.
Add a few drops of methyl orange indicator to the ammonia solution.
Slowly add dilute sulfuric acid from the burette to the ammonia solution while stirring until the indicator changes color, indicating neutralization.
Record the final volume of sulfuric acid in the burette.
Prepare Ammonium Sulfate Solution:
Use the volumetric amounts determined in the titration to mix ammonia solution and sulfuric acid to form ammonium sulfate solution.
Evaporation to Crystallization:
Heat the solution gently to evaporate some water until it becomes saturated.
Allow the solution to cool: as it cools, ammonium sulfate crystals will form.
Filter the crystals using filter paper and rinse them with cold water.
Dry the crystallized ammonium sulfate in a warm oven or air-dry.
Final Steps:
Store the pure, dry ammonium sulfate crystals in a suitable container.
