6 (a) Methane is a hydrocarbon fuel - Edexcel - GCSE Chemistry - Question 6 - 2020 - Paper 1
Question 6
6 (a) Methane is a hydrocarbon fuel.
(i) Complete the word equation for the complete combustion of methane in oxygen.
methane + oxygen → water
(ii) The incomplete... show full transcript
Worked Solution & Example Answer:6 (a) Methane is a hydrocarbon fuel - Edexcel - GCSE Chemistry - Question 6 - 2020 - Paper 1
Step 1
Complete the word equation for the complete combustion of methane in oxygen.
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Answer
The complete word equation for the combustion of methane in oxygen is:
methane + oxygen → water
Step 2
Give the reason why carbon and carbon monoxide are produced in the incomplete combustion of methane.
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Answer
Carbon and carbon monoxide are produced in the incomplete combustion of methane due to a limited supply of oxygen. When oxygen is insufficient, the methane does not fully react and thus forms these by-products.
Step 3
Name the fraction in Figure 10 that is used to surface roads.
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Answer
The fraction used to surface roads is fuel oil.
Step 4
Name the fraction in Figure 10 that contains hydrocarbons with the lowest boiling point.
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Answer
The fraction that contains hydrocarbons with the lowest boiling point is gases.
Step 5
Which of the following shows the fractions where the relative demand is greater than the relative amount in the crude oil?
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Answer
The correct option is B: gases, petrol, diesel oil.
Step 6
Determine the value of x in the molecule of C₃H₈.
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Answer
In the molecule of C₃H₈, x represents the number of hydrogen atoms. Therefore, x = 8.
Step 7
Calculate the maximum mass of octane that could be produced when 340g of dodecane is cracked in this reaction.
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Answer
To find the maximum mass of octane, we first determine the number of moles of dodecane:
Since 1 mole of dodecane produces 1 mole of octane, the maximum moles of octane produced is also 2 moles. Then, we calculate the mass of octane produced:
[ \text{mass of octane} = 2\ mol \times 114\ g/mol = 228\ g ]
Thus, the maximum mass of octane that can be produced is 228 g.
