2025 Pearson Edexcel A level Chemistry Question Paper Option 2 June + Mark scheme

Candidate surname Other names


Centre Number Candidate Number




Paper


Chemistry 🟐 🟐


Advanced
PAPER 2: Advanced Organic and Physical Chemistry

Marks




Instructions
• Use black ink or ball‑point pen.
• Fill in theis used
If pencil for diagrams/sketches/graphs it must be dark (HB or B).
• centre number 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.
• For the question marked with an asterisk (*), marks will be awarded for your ability
to structure 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
Showeach question carefully before you
andstart to answer it.
• all your working in calculations include units where appropriate.

• Check your answers if you have time at the end.
2025 Pearson Edexcel A level Chemistry

Question Paper Option 2 June+ Mark

scheme

,DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA




■■■■
BLANK PAGE




2

, Answer ALL questions.

Some questions must be answered with a cross in a box . If you change your mind about an
DO NOT WRITE IN THIS AREA




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?
DO NOT WRITE IN THIS AREA




(1)
A 15

B 29

C 43

D 59

(Total for Question 1 = 2 marks)
DO NOT WRITE IN THIS AREA




3
■■■■ Turn over

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




DO NOT WRITE IN THIS AREA
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)

. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. .. ... .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. . . . ......................




DO NOT WRITE IN THIS AREA
. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. .. ... .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. .. .. .. ... .. .. ... .. ... .. . . ... .. .. ... .. .. ... .. ... .. .. . ......................



. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. .. ... .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. . .. .. .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. . ......................



. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. .. ... .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. . . . ......................



. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. .. ... .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. . . . ......................



. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. .. ... .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. . . . ......................



(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
DO NOT WRITE IN THIS AREA


C London forces

D permanent dipole‑dipole forces




4
■■■■