Crude oil is a mixture of hydrocarbons - AQA - GCSE Chemistry Combined Science - Question 1 - 2018 - Paper 2
Question 1
Crude oil is a mixture of hydrocarbons.
The hydrocarbons in crude oil are separated into fractions by fractional distillation.
Figure 1 shows a fractional distilla... show full transcript
Worked Solution & Example Answer:Crude oil is a mixture of hydrocarbons - AQA - GCSE Chemistry Combined Science - Question 1 - 2018 - Paper 2
Step 1
Complete the sentence.
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Answer
The crude oil condenses.
Step 2
Each fraction __________ at a different level.
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Answer
The fractions have different boiling points.
Step 3
Name the alkane.
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Answer
The alkane is propane.
Step 4
What is the general formula for alkanes?
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Answer
The general formula for alkanes is CₙH₂ₙ₊₂.
Step 5
Balance the equation for methane burning.
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Answer
CH4+2O2→CO2+2H2O
Step 6
Which reagent is used to test for alkenes?
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Answer
Bromine water.
Step 7
Why are life cycle assessments (LCA) done?
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Answer
They are done to assess the environmental impact of the stages in the life of a product.
Step 8
Compare the two methods for the disposal of biodegradable plastic bags.
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Answer
Burning 10,000 bags produces 10 kg more of carbon dioxide compared to landfill.
Putting 10,000 bags in landfill produces 0.02 kg of solid residue less than burning.
Landfill produces less sulfur dioxide than burning.
