MERGED QUESTION PAPER AND MARK SCHEME 2025 Pearson Edexcel Level GCE Advance Subsidiary In Chemistry (8CH0) Paper 02: Core Organic and Physical Chemistry

Pearson Edexcel Level 3 GCE
Tuesday 20 May 2025
Morning (Time: 1 hour 30 minutes) Paper
reference 8CH0/02
Chemistry  


Advanced Subsidiary
PAPER 2: Core Organic and Physical Chemistry

, 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 a naturally‑occurring compound called myrcene, which is
found in many plants.
The skeletal formula of myrcene is shown.




(a) What is the molecular formula of myrcene?
(1)
A C5H5

B C5H8

C C10H10
D C10H16


(b) What is the maximum number of moles of bromine molecules that could react
with one mole of myrcene in the dark?
(1)
A 2

B 3

C 4

D 6


(c) Myrcene is a dimer of isoprene.
Isoprene has the skeletal formula shown.




Which is the IUPAC name for isoprene?
(1)
A 2‑methylbut‑1,3‑ene

B 2‑methylbuta‑1,3‑diene

C 1,3‑diene‑2‑methylbutane

D 2‑methylpent‑1,3‑ene


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, (d) Which reagent would convert an alkene group into a diol?
(1)
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A hydrogen gas and a nickel catalyst

B acidified potassium dichromate(VI)

C acidified potassium manganate(VII)

D steam and an acid catalyst
(Total for Question 1 = 4 marks)

2 Which compound must be named using the E/Z system and could not be named
using the cis/trans system?

A HOOC CH2 CH2 COOH

B HOOC CH2 CBr CH COOH

C HOOC CH2 CBr CBr2

D HOOC (CH2)2 CH CH (CH2)2 COOH
(Total for Question 2 = 1 mark)




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, 3 This question is about the combustion of alcohols.
The table shows the enthalpy change of combustion for a series of alcohols.




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Enthalpy change of combustion
Name Formula
/ kJ mol–1

methanol CH3OH –726

ethanol C2H5OH –1367

propan‑1‑ol C3H7OH –2021

butan‑1‑ol C4H9OH –2676


(a) Predict the enthalpy change of combustion of hexan‑1‑ol, C6H13OH.
(1)



.............................................................. kJ mol–1

(b) The enthalpy change of combustion of octan‑1‑ol can be determined using the
equipment shown in the diagram.
Procedure
A spirit burner was filled with liquid octan‑1‑ol.
The burner was weighed, lit and then used to raise the temperature of a quantity
of water in a calorimeter.
The burner was then extinguished and reweighed.

thermometer




calorimeter


water


spirit burner

octan-1-ol



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