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, first add copper oxide to dilute sulfuric acid in excess until the reaction completes. This means stirring until no more copper oxide dissolves. Next, filter the mixture to remove any excess undissolved copper oxide. Then, heat the filtered solution to evaporate some water, allowing the copper sulfate to crystallize as it cools.
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 calculate the mass of copper oxide needed, use the formula:
Calculate the mass of CuO for 24.95 g of CuSO₄.5H₂O:
249.524.95imes79.5=7.95extgofCuO
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 generally decreases, with the exception of country C or D. Furthermore, sulfuric acid production is not directly linked to the wealth of a country.
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 the rise in the application of polymers, plastics, ethanol, and biofuels, all of which utilize ethene as a key raw material.
