Figure 5 shows one molecule of a compound obtained from crude oil - Edexcel - GCSE Chemistry Combined Science - Question 3 - 2022 - Paper 1
Question 3
Figure 5 shows one molecule of a compound obtained from crude oil.
(i) Give the names of the two elements in this molecule:
(ii) What is the molecule in Figure 5?
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Worked Solution & Example Answer:Figure 5 shows one molecule of a compound obtained from crude oil - Edexcel - GCSE Chemistry Combined Science - Question 3 - 2022 - Paper 1
Step 1
Give the names of the two elements in this molecule:
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Answer
The two elements in the molecule are carbon and hydrogen.
Step 2
What is the molecule in Figure 5?
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Answer
The molecule in Figure 5 is a chain molecule (Option B).
Step 3
What is the relative formula mass of the compound in Figure 5?
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Answer
The relative formula mass of the compound is 44 (Option C). This is calculated as follows:
extRelativemass=(12imes2)+(1imes6)=24+6=30
Step 4
Draw one straight line from each fraction to a use of that fraction.
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Answer
Fraction
Use
petrol
fuel for cars
kerosene
fuel for aircraft
bitumen
making road surfaces
Step 5
State and explain the colour change you would observe in each test tube.
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Answer
For hydrogen chloride (HCl), blue litmus paper turns red. This is because HCl is an acid.
For sulfur dioxide (SO₂), blue litmus paper also turns red. SO₂ is acidic when dissolved in water.
