A-Level Edexcel 2025 Chemistry Paper 2

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Pearson Edexcel Level 3 GCE
Monday 16 June 2025
Morning (Time: 1 hour 45 minutes) Paper
reference 9CH0/02
Chemistry  


Advanced
PAPER 2: Advanced Organic and Physical Chemistry

You must have: Total Marks
Scientific calculator, Data Booklet, ruler



Instructions
• Use black ink or ball‑point pen.
• IfFillpencil is used for diagrams/sketches/graphs it must be dark (HB or B).
• centre number
in the boxes at the top of this page with your name,
and candidate number.
• Answer all questions.
• Answer the questions in the spaces provided
– there may be more space than you need.

Information
• The total mark for this paper is 90.
• The marks for each question are shown in brackets
– use this as a guide as to how much time to spend on each question.
• toForstructure
the question marked with an asterisk (*), marks will be awarded for your ability
your answer logically, showing how the points that you make are related
or follow on from each other where appropriate.
• A Periodic Table is printed on the back cover of this paper.

Advice
• Read each question carefully before you start to answer it.
• Show all your working in calculations and include units where appropriate.
• your answers if you have time at the end.
Check
Turn over


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2

, Answer ALL questions.

Some questions must be answered with a cross in a box . If you change your mind about an
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answer, put a line through the box and then mark your new answer with a cross .

1 This question is about mass spectrometry.
(a) Which molecule would not give a molecular ion peak with m/z = 74?
(1)
A C2H5COOH

B CHOCOOH

C CH2(OH)COOH

D CH3COOCH3


(b) The fragmentation pattern in a mass spectrum can be used to distinguish
between structural isomers.
Which m/z peak would be present in the mass spectrum of propanal, CH3CH2CHO,
but not in the mass spectrum of propanone, CH3COCH3 ?
(1)
A 15

B 29

C 43

D 59
(Total for Question 1 = 2 marks)




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, 2 Intermolecular forces affect the physical properties of compounds.
(a) Which of these isomers, with the formula C8H18 , will have the




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lowest boiling temperature?
(1)
A (CH3)2CHCH2C(CH3)3

B (CH3)2CHCH2CH(CH3)CH2CH3

C CH3CH2CH2C(CH3)2CH2CH3

D CH3CH2CH2CH2CH2CH2CH2CH3


(b) Pentan‑1‑ol and hexane have the same number of electrons but pentan‑1‑ol is
much less volatile than hexane.
Explain this difference in volatility.
(2)

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(c) Iodine is a solid at room temperature but on gentle heating it vaporises.
What bonds or forces are being broken?
(1)
A covalent bonds

B ionic bonds

C London forces

D permanent dipole‑dipole forces




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