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... show full transcript
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.
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:
Each carbon (C) contributes 12 and each hydrogen (H) contributes 1.
There are 6 H atoms and 2 C atoms:
Relative mass = (2 x 12) + (6 x 1) = 24 + 6 = 30
Since the closest option in choices is C 44, that would be the most appropriate based on provided context.
Step 4
Draw one straight line from each fraction to a use of that fraction.
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Answer
Fraction
Use for
petrol
fuel for cars
kerosene
fuel for ships
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 into the test tubes with hydrogen chloride (HCl) and sulfur dioxide (SO₂):
HCl solution will turn the litmus paper red because it is an acid.
SO₂ will also turn the litmus paper red, indicating acidity as well.
Both gases dissolve forming acidic solutions.
