This question is about sulfuric acid (H₂SO₄) and ethene - AQA - GCSE Chemistry - Question 4 - 2017 - Paper 1
Question 4
This question is about sulfuric acid (H₂SO₄) and ethene.
Sulfuric acid is used to produce copper sulfate (CuSO₄).
The equation for the reaction is:
CuO(s) + H₂SO₄... show full transcript
Worked Solution & Example Answer:This question is about sulfuric acid (H₂SO₄) and ethene - AQA - GCSE Chemistry - Question 4 - 2017 - Paper 1
Step 1
Describe a method for making copper sulfate crystals from copper oxide and sulfuric acid.
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Answer
To make copper sulfate crystals from copper oxide and sulfuric acid, follow these steps:
Add Copper Oxide: Begin by adding excess copper oxide to warm sulfuric acid in a beaker. This ensures that all of the sulfuric acid reacts.
Filter: After the reaction has occurred, filter the mixture to remove any unreacted copper oxide.
Evaporate: Heat the resulting solution gently to evaporate some of the water but do not let it dry completely.
Crystallize: Allow the solution to cool slowly to form copper sulfate crystals.
Step 2
Calculate the mass of copper oxide required to produce 24.95 g of copper sulfate crystals (CuSO₄·5H₂O).
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Answer
To find the mass of copper oxide required, we first need to calculate the moles of copper sulfate crystals produced:
Calculate Moles:
Mf=249.5 g/mol
The moles of CuSO₄·5H₂O are calculated using:
Moles=Mfmass=249.5 g/mol24.95 g≈0.1 mol
Calculate Mass of CuO:
The reaction equation indicates that 1 mole of CuO produces 1 mole of CuSO₄. Therefore,
Mass of CuO=M⋅Ar
where Ar=63.5extg/mol.
Hence,
Mass of CuO=0.1 mol×79.5 g/mol=7.95 g
Step 3
How does the wealth of countries relate to their production of ethene and sulfuric acid?
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Answer
As wealth decreases, ethene production decreases, with the exception of country C or D.
Furthermore, sulfuric acid production is not directly linked to wealth.
Step 4
Suggest why the use of ethene has increased in the last 50 years.
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Answer
The use of products of ethene has increased due to advancements in polymer production and the growing demand for plastics, ethanol, and other chemicals derived from ethene.
