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. Therefore, the correct answer is B.
Step 3
What is the relative formula mass of the compound in Figure 5?
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Answer
To calculate the relative formula mass, we count the number of each atom present in the molecule:
There are 6 hydrogen atoms: 6imes1.0=6
There are 4 carbon atoms: 4imes12=48
Total relative formula mass = 6+48=44. Thus, the correct answer is C 44.
Step 4
Draw one straight line from each fraction to a use of that fraction.
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Answer
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
When blue litmus paper is dipped in:
Hydrogen chloride (HCl) solution, it will turn red, indicating an acidic solution.
Sulfur dioxide (SO₂) solution, it also turns red, as SO₂ in water also forms an acidic solution. Both gases are acids.
