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June 2025 Edexcel: A Level Chemistry 9CH0/03 Paper 3 – General and Practical Principles in Chemistry – Merged Question Paper & Mark Scheme Exam Resource Summary This June 2025 Edexcel A Level Chemistry (9CH0) Paper 3 – General and Practical Principles in Chemistry – Merged Question Paper & Mark Scheme. This document brings together the official exam paper and the corresponding mark scheme for the 9CH0/03 paper. It covers content drawn from all topics of the A Level Chemistry specification—including inorganic, organic and physical chemistry—as well as indirect assessment of practical skills and synoptic questions that draw on multiple areas of the curriculum. The merged format supports students by providing clear guidance on how questions are structured, how marks are allocated, and what examiners look for in answers (including appropriate scientific terminology, logical argumentation, correct calculations, and reference to practical contexts). An excellent resource for focused revision, self-assessment and preparation for the practical- and theory-integrated demands of the 2025 Edexcel A Level Chemistry Paper 3. Answer ALL questions. Write your answers in the spaces provided. 1 This question is about ionisation energies. The table shows the first four ionisation energies of three elements in the same group of the Periodic Table. The letters used are not the symbols of the elements. Element First ionisation energy / kJ mol−1 Second ionisation energy / kJ mol−1 Third ionisation energy / kJ mol−1 Fourth ionisation energy / kJ mol−1 X Y Z (a) State what is meant by the term ‘first ionisation energy’. (2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . .. . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . .. . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . .. . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . .. . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . .. . . . . .. . . . . . . . . (b) Explain to which group the elements X, Y and Z belong.

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June 2025 Edexcel: A Level Chemistry 9CH0/03 Paper

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June 2025 Edexcel: A Level Chemistry 9CH0/03 Paper

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June 2025 Edexcel: A Level
Chemistry 9CH0/03 Paper 3 – General
and Practical Principles in Chemistry –
Merged Question Paper & Mark
Scheme

Morning (Time: 2 hours 30 minutes) Paper

Chemistry 🟐 🟐

Advanced
PAPER 3: General and Practical Principles in Chemistry

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This June 2025 Edexcel A Level Chemistry (9CH0) Paper 3 – General and Practical
•• Answer
Principles in Chemistry – Merged Question Paper & Mark Scheme.
Answer all
thequestions.
questions in the spaces provided
This document brings together the official exam paper and the corresponding mark
– there may be more space than you need.
scheme for the 9CH0/03 paper. It covers content drawn from all topics of the A Level
Chemistry specification—including inorganic, organic and physical chemistry—as well as
Information
indirect assessment of practical skills and synoptic questions that draw on multiple areas

•• of the curriculum. The merged format supports students by providing clear guidance on
The
how
The
total
answers
mark for
questions this
are paper is 120.
structured,
for each question
marks(including
how marks are allocated, and what examiners look for in
are scientific
appropriate shown in brackets
terminology, logical argumentation, correct

•
– use this as a guide as to how much time to spend
calculations, and reference to practical contexts). on each question.
For the question marked with an asterisk (*), marks will be awarded
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and preparation
ability to structure
practical- your answer logically,
and theory-integrated demandsshowing
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2025the pointsAthat
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Chemistry

•
are related or follow on from each other where appropriate.
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P77834A
©2025 Pearson Education Ltd.
Y:1/1/1/1/

, Answer ALL questions.
Write your answers in the spaces provided.

DO NOT WRITE IN THIS AREA
1 This question is about ionisation energies.

The table shows the first four ionisation energies of three elements in the same group
of the Periodic Table.
The letters used are not the symbols of the elements.

First ionisation Second ionisation Third ionisation Fourth ionisation
Element energy energy energy energy
/ kJ mol−1 / kJ mol−1 / kJ mol−1 / kJ mol−1

X 403 2632 3900 5080

Y 419 3051 4412 5877

Z 496 4563 6913 9544

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(a) State what is meant by the term ‘first ionisation energy’.
(2)

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(b) Explain to which group the elements X, Y and Z belong.
(2)

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, (c) Explain which of the elements X, Y and Z has the highest atomic number.
(3)
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(Total for Question 1 = 7 marks)
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3

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, 2 This question is about compounds that contain both an alkene and an alcohol
functional group.

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(a) Prop-2-en-1-ol, present in garlic, has the structure shown.

H CH2OH
C C
H H

(i) Describe a test, and the positive result, that confirms the presence of a
C C group.
(2)
Test

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

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Result

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(ii) Prop-2-en-1-ol reacts with hydrogen bromide to form 3-bromopropan-1-ol as
one of the products.

Draw a mechanism for this reaction.
Include curly arrows, and relevant lone pairs and dipoles.
(3)

H CH2OH
C C
H H
DO NOT WRITE IN THIS AREA

4

■■■■

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