2025 Pearson Edexcel Level 3 GCE Chemistry Advanced
Subsidiary PAPER 2: Core Organic and Physical Chemistry Combined Question Paper and Marking Scheme
Please check the examination details below before entering your candidate information
Candidate surname Other names
Centre Number Candidate Number
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
You must have: Total Marks
Scientific calculator, Data Booklet, ruler
Instructions
•• Use black ink or ball‑point pen.
If pencil is used for diagrams/sketches/graphs it must be dark (HB or B).
• Fillcentre
in the boxes at the top of this page with your name,
number and candidate number.
•• Answer
Answer all questions.
the questions in the spaces provided
– there may be more space than you need.
Information
• The total mark for this paper is 80.
• – use this asfora guide
The marks each question are shown in brackets
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 each question carefully before you start to answer it.
• Show all your working in calculations and include units where appropriate.
• Check your answers if you have time at the end. Turn over
P77831A
©2025 Pearson Education Ltd.
Y:1/1/1/
, 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 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
DO NOT WRITE IN THIS AREA
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. DO NOT WRITE IN THIS AREA
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
2
, (d) Which reagent would convert an alkene group into a diol?
(1)
DO NOT WRITE IN THIS AREA
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
DO NOT WRITE IN THIS AREA
(Total for Question 2 = 1 mark)
DO NOT WRITE IN THIS AREA
3
Turn over
, 3 This question is about the combustion of alcohols.
The table shows the enthalpy change of combustion for a series of alcohols.
DO NOT WRITE IN THIS AREA
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)
DO NOT WRITE IN THIS AREA
............................................................... 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
DO NOT WRITE IN THIS AREA
calorimeter
water
spirit burner
octan-1-ol
4
Subsidiary PAPER 2: Core Organic and Physical Chemistry Combined Question Paper and Marking Scheme
Please check the examination details below before entering your candidate information
Candidate surname Other names
Centre Number Candidate Number
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
You must have: Total Marks
Scientific calculator, Data Booklet, ruler
Instructions
•• Use black ink or ball‑point pen.
If pencil is used for diagrams/sketches/graphs it must be dark (HB or B).
• Fillcentre
in the boxes at the top of this page with your name,
number and candidate number.
•• Answer
Answer all questions.
the questions in the spaces provided
– there may be more space than you need.
Information
• The total mark for this paper is 80.
• – use this asfora guide
The marks each question are shown in brackets
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 each question carefully before you start to answer it.
• Show all your working in calculations and include units where appropriate.
• Check your answers if you have time at the end. Turn over
P77831A
©2025 Pearson Education Ltd.
Y:1/1/1/
, 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 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
DO NOT WRITE IN THIS AREA
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. DO NOT WRITE IN THIS AREA
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
2
, (d) Which reagent would convert an alkene group into a diol?
(1)
DO NOT WRITE IN THIS AREA
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
DO NOT WRITE IN THIS AREA
(Total for Question 2 = 1 mark)
DO NOT WRITE IN THIS AREA
3
Turn over
, 3 This question is about the combustion of alcohols.
The table shows the enthalpy change of combustion for a series of alcohols.
DO NOT WRITE IN THIS AREA
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)
DO NOT WRITE IN THIS AREA
............................................................... 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
DO NOT WRITE IN THIS AREA
calorimeter
water
spirit burner
octan-1-ol
4
