2023 AQA AS CHEMISTRY 7404/2 Paper 2
Organic and Physical Chemistry Question
Paper & Mark scheme (Merged) June 2023
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AS
CHEMISTRY
Paper 2 Organic and Physical Chemistry
Tuesday 23 May 2023 Morning Time allowed: 1 hour 30 minutes
Materials For Examiner’s Use
For this paper you must have:
• the Periodic Table/Data Sheet, provided as an insert (enclosed) Question Mark
• a ruler with millimetre measurements
1
• a scientific calculator, which you are expected to use where appropriate.
2
Instructions 3
• Use black ink or black ball-point pen. 4
• Fill in the boxes at the top of this page.
5
• Answer all questions.
• You must answer the questions in the spaces provided. Do not write outside 6
the box around each page or on blank pages. 7
• If you need extra space for your answer(s), use the lined pages at the end of 8
this book. Write the question number against your answer(s).
Section B
• All working must be shown.
• Do all rough work in this book. Cross through any work you do not TOTAL
want to be marked.
Information
• The marks for questions are shown in brackets.
• The maximum mark for this paper is 80.
Advice
You are advised to spend about 65 minutes on Section A and 25 minutes on Section B.
, 2
Do not write
outside the
Section A box
Answer all questions in this section.
0 1This question is about the analysis of organic compounds.
For each pair of compounds in Questions 01.1 and 01.2, give a reagent (or
combination of reagents) that could be added separately to each compound in a
single reaction to distinguish between them.
State what is observed in each case.
0 1 . 1CH3CH2CH2CHO and CH3CH2CH(OH)CH3
[3 marks]
Reagent(s)
Observation with CH3CH2CH2CHO
Observation with CH3CH2CH(OH)CH3
0 1.2 Cyclohexane and cyclohexene
[3 marks]
Reagent(s)
Observation with cyclohexane
Observation with cyclohexene
*02*
IB/M/Jun23/7404/2
, 3
Do not write
outside the
0 1 . 3 Table 1 gives the precise relative molecular masses (Mr) of some organic compounds box
measured using high resolution mass spectrometry.
Table 1
Molecular formula C5H12 C5H10 C6H6
Mr 72.1416 70.1260 to be calculated
Use these data to find the relative atomic masses (Ar) of hydrogen and carbon.
Give your answers to 4 decimal places.
Use these calculated Ar values to find the relative molecular mass (Mr) of C6H6
Give your answer to 4 decimal places.
[3 marks]
Ar of hydrogen
Ar of carbon
Mr of C6H6 9
Turn over ►
*03*
IB/M/Jun23/7404/2
, 4
Do not write
outside the
0 2 This question is about fuels. box
0 2 . 1 Crude oil is separated into fractions by fractional distillation.
State the meaning of the term ‘fraction’ in this context.
[1 mark]
0 2 . 2 Petrol for cars contains branched and cyclic alkanes produced by catalytic cracking.
Identify the catalyst used in this process.
[1 mark]
0 2 . 3 3-Ethyl-4-methylhexane is a branched alkane in petrol.
Draw the skeletal formula of this alkane.
[1 mark]
0 2 . 4 Give the equation for the complete combustion of 3-ethyl-4-methylhexane.
Use the molecular formula for 3-ethyl-4-methylhexane in your equation.
[2 marks]
*04*
IB/M/Jun23/7404/2
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