11 mark
What is the name of the process that converts large alkane molecules into smaller alkane molecules?
Cracking
Fractional distillation
Hydrogenation
Polymerisation
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Organic Chemistry (OCR Gateway GCSE Chemistry: Combined Science)
Exam Questions
51 mins21 questions21 mark
A student bubbles ethene gas into bromine water.
What is observed?
Colour change from blue to colourless
Colour change from colourless to orange
Colour change from orange to colourless
Orange precipitate is made
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31 mark
Crude oil is a resource that is being made extremely slowly.
Which word describes a resource that is being made extremely slowly?
Finite
Hydrocarbon
Non‐renewable
Petrochemical
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11 mark
Heptane is an alkane with seven carbons.
What is the chemical formula of heptane?
C7H10
C7H12
C7H14
C7H16
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21 mark
The complete combustion of pentane, C5H12, takes place in the following unbalanced equation:
_C5H12 + _O2 → _CO2 + _H2O
What numbers will balance the reaction?
1,4,5,3
1,8,5,6
2,8,5,6
2,4,5,6
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31 mark
Which of the following molecules is an alkene?
C6H10
C4H10
C5H10
C6H14
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41 mark
Which molecule can be cracked to produce hexane, C6H14?
C4H8
C4H10
C6H12
C10H22
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51 mark
Crude oil is a mixture of hydrocarbons.
Crude oil is separated into useful fractions.
Which of these mixtures of substances could be in a fraction from crude oil?
C2H4, C4H10, C4H10O
C2H4, C2H3Br, C4H10
C2H6, C3H8, C4H10
C2H6, C2H3Br, C4H10O
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61 mark
Crude oil is separated into fractions by fractional distillation.
Look at the diagram of the fractions made in fractional distillation.
Which of these fractions has the lowest boiling point?
Bitumen
Diesel oil
Gases
Petrol
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71 mark
The bar chart shows the amount of some fractions made from 100 tonnes of crude oil by fractional distillation.
It also shows the amount of each fraction needed for everyday uses.
Cracking converts large molecules into smaller more useful molecules to make the supply match the demand.
Which fractions are most likely to be cracked to make the supply match the demand?
Gas oil and fuel oil
Gas oil and petrol
Naphtha, paraffin and fuel oil
Petrol and gases
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81 mark
What is the general formula of the fractions produced by the fractional distillation of crude oil?
CnH2n
CnH2n+2
C2H2n+1OH
C2n+2H2
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11 mark
Crude oil is separated into fractions by fractional distillation.
Look at the diagram of the fractions made in fractional distillation
Which of these fractions has the strongest intermolecular forces?
Bitumen
Diesel oil
Gases
Kerosene
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21 mark
Which fraction is collected at the top of the fractional distillation column?
|
Melting point range (°C) |
Boiling point range (°C) |
|
|
A |
–70 – –60 |
20 – 25 |
|
B |
–50 – –40 |
30 – 50 |
|
C |
0 – 20 |
100 – 120 |
|
D |
20 – 40 |
130 – 160 |
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