2025 Pearson Edexcel GCE A Level In Chemistry (9CH0) Paper 03: General and Practical Principles in Chemistry ( Question Paper with Mark Scheme Combined, June 2025)

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Pearson Edexcel Level 3 GCE
Friday 20 June 2025
Morning (Time: 2 hours 30 minutes) Paper
reference 9CH0/03
Chemistry  


Advanced
PAPER 3: General and Practical Principles in 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).
• Fill in the boxes at the top of this page with your name,
centre number 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 120.
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 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


P77834A
©2025 Pearson Education Ltd.
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*P77834A0136*

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




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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

(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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*P77834A0236* 

, (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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 *P77834A0336* Turn over

, 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




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*P77834A0436* 