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May 2025 Edexcel: AS Level Chemistry 8CH0/01 Paper 1 – Core Inorganic and Physical Chemistry – Merged Question Paper & Mark Scheme

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May 2025 Edexcel: AS Level Chemistry 8CH0/01 Paper 1 – Core Inorganic and Physical Chemistry – Merged Question Paper & Mark Scheme Exam Resource Summary This May 2025 Edexcel AS Level Chemistry (8CH0) Paper 1 – Core Inorganic and Physical Chemistry – Merged Question Paper & Mark Scheme. It consolidates both the official question paper and the mark scheme into one document, covering key topics such as atomic structure, bonding, periodicity, energetics, kinetics, equilibria and inorganic chemistry. The integrated format offers students direct insight into examiner expectations, mark allocation, question styles and model answers — supporting efficient revision, self-assessment and examtechnique development. An invaluable resource for success in the 2025 Edexcel AS Level Chemistry Paper 1 examination

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May 2025 Edexcel: AS Level Chemistry
8CH0/01 Paper 1 – Core Inorganic and
Physical Chemistry – Merged Question
Paper & Mark Scheme




Morning (Time: 1 hour 30 minutes) Paper


Chemistry 🟐 🟐


Advanced Subsidiary
PAPER 1: Core Inorganic and Physical Chemistry




Instructions
•• Use black ink or ball-point pen.
If pencil is used for diagrams/sketches/graphs it must be dark (HB or B).
• centre
Fill in the boxesand
number at the top of this
candidate page with your name,
number.

•• Answer
Answer all
thequestions.
questions in the spaces provided
– there may be more space than you need.

Information

•• The total mark for this paper is 80.
The marks for each question are shown in brackets
Exam
– useResource Summary
•Physical
this as a guide as to how much time to spend on each question.
This
ForMay
the 2025 Edexcel
question markedASwith
Level
an Chemistry
asterisk (*),(8CH0)
marksPaper
will be1 awarded
– Core Inorganic
for your and
Chemistry
ability to structure –your
Merged Question
answer logically,Paper & Mark
showing Scheme.
how the points that you make


It consolidates
are related orboth the
follow onofficial question
from each other paper
where and the mark scheme into one
appropriate.
A Periodic Table is printed on the back cover of this paper. bonding, periodicity,
document, covering key topics such as atomic structure,
energetics, kinetics, equilibria and inorganic chemistry. The integrated format offers
Advice
students direct insight into examiner expectations, mark allocation, question styles

••
and model answers — supporting efficient revision, self-assessment and exam-
Read each
technique question carefully
development. before youresource
An invaluable start to answer it.
for success in the 2025 Edexcel AS
Show all your working in calculations and include units where appropriate.

Level Chemistry Paper 1 examination.
Check your answers if you have time at the end. Turn over


P77830A
©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 Chlorine, Cl2 , and silicon tetrachloride, SiC l4 , are covalently bonded molecules with
low boiling temperatures.

(a) The definition of electronegativity is the ability of an atom to attract
(1)
A a single bonding electron from a covalent bond

B a pair of electrons from a covalent bond

C electron density from a neighbouring atom
D two electrons from a positive ion

(b) Draw a dot-and-cross diagram of silicon tetrachloride, showing outer shells of
electrons only.
Use crosses (×) for silicon electrons and dots (•) for chlorine electrons.




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(2)




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2

■■■■

, (c) Explain, using electronegativity values, why both chlorine and
silicon tetrachloride are non-polar molecules.
(3)
DO NOT WRITE IN THIS AREA




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(d) Explain why the boiling temperature of chlorine (−34 °C) is lower than that of
silicon tetrachloride (57 °C).
(2)

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(Total for Question 1 = 8 marks)




3

■■■■ Turn over

, 2 At room temperature, both sodium metal and sodium chloride are solids
containing ions.




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(a) (i) Draw labelled 2-dimensional diagrams showing the structures of both
sodium metal and sodium chloride including nine ions in each diagram.
(3)




sodium metal sodium chloride




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(ii) Describe what holds the ions together in sodium metal and in sodium chloride.
(2)
Sodium metal

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Sodium chloride

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(iii) The melting temperature of sodium chloride is much higher than that of
sodium metal.
State what this information shows about the bonding in these
two substances.
(1)

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