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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.
Answer
To make copper sulfate crystals from copper oxide and sulfuric acid, follow these steps:
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Addition: Start by adding copper oxide to dilute sulfuric acid in a beaker. Ensure there is sufficient copper oxide to react with all of the acid.
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Reaction: The mixture should be stirred until the copper oxide has completely reacted.
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Filtration: Filter the mixture to remove any excess copper oxide that has not reacted, yielding a clear copper sulfate solution.
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Crystallization: Heat the filtered solution gently to evaporate some of the water, then allow it to cool gradually. Crystals of copper sulfate will form as the solution evaporates.
Step 2
Calculate the mass of copper oxide required to produce 24.95 g of copper sulfate crystals (CuSO₄·5H₂O).
Answer
To calculate the mass of copper oxide needed, use the formula:
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Determine the molar masses:
- Molar mass of CuSO₄·5H₂O = 249.5 g/mol.
- Molar mass of CuO can be calculated as follows:
- M(Cu) = 63.5 g/mol,
- M(O) = 16 g/mol
Therefore, M(CuO) = 63.5 + 16 = 79.5 g/mol.
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Moles of copper sulfate: Calculate moles of CuSO₄·5H₂O produced:
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Stoichiometry: From the balanced equation, 1 mole of CuSO₄ is produced from 1 mole of CuO. Thus, moles of CuO needed = 0.1.
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Mass of copper oxide: Finally, calculate the mass of CuO:
Step 3
How does the wealth of countries relate to their production of ethene and sulfuric acid?
Answer
From the data in Table 1, it can be seen that as wealth decreases, ethene production tends to decrease as well, with the exception of country C or D.
Furthermore, the production of sulfuric acid does not appear to be linked to the wealth of a country, as it varies independently of the wealth values presented.
Step 4
Suggest why the use of ethene has increased in the last 50 years.
Answer
The use of products of ethene has increased largely due to advancements in polymer technologies and the growing demand for plastics. Ethene is a key raw material in the production of various polymers used in everyday items, thereby significantly raising its demand over time.