(a) Figure 8 shows one molecule of a compound obtained from crude oil - Edexcel - GCSE Chemistry - Question 5 - 2022 - Paper 1
Question 5
(a) Figure 8 shows one molecule of a compound obtained from crude oil.
H H H
H - C - C - C - H
H H H
Figure 8
(i) Give the names of the two element... show full transcript
Worked Solution & Example Answer:(a) Figure 8 shows one molecule of a compound obtained from crude oil - Edexcel - GCSE Chemistry - Question 5 - 2022 - Paper 1
Step 1
Give the names of the two elements in this molecule
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Answer
The two elements in this molecule are carbon and hydrogen. The presence of carbon atoms and hydrogen atoms can be observed from the structure of the molecule.
Step 2
What is the molecule in Figure 8?
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Answer
The molecule in Figure 8 is a chain molecule. This refers to the linear arrangement of carbon atoms connected by single covalent bonds, characteristic of alkanes.
Step 3
What is the relative formula mass of the compound in Figure 8?
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Answer
The relative formula mass of the compound can be calculated by summing the atomic masses of all the atoms in the molecule. The molecule contains 3 carbon atoms and 8 hydrogen atoms:
extRelativeFormulaMass=(3imes12)+(8imes1)=36+8=44
Thus, the relative formula mass is 44.
Step 4
Draw one straight line from each fraction to a use of that fraction
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Answer
Fuel for aircraft - kerosene
Fuel for ships - petrol
Fuel for cars - bitumen
Making plastic - bitumen
Extracting iron - kerosene
Making road surfaces - bitumen.
Step 5
State and explain the colour change you would observe in each test tube
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Answer
In the test tube containing hydrogen chloride gas, the blue litmus paper will turn red, indicating an acidic solution. This is because hydrogen chloride is an acid. In the test tube with sulfur dioxide gas, the blue litmus paper will also turn red, as sulfur dioxide in water forms sulfurous acid, which is also acidic. Thus, both gases will result in a colour change of blue to red for the litmus paper.
