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Exam (elaborations)

2025 Pearson Edexcel As level Chemistry Question Paper Option 1 June + Mark scheme

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2025 Pearson Edexcel As level Chemistry Question Paper Option 1 June + Mark scheme

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2025 Pearson Edexcel As level Chemistry Question
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2025 Pearson Edexcel As level Chemistry Question

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December 2, 2025
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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

• For
– use this as a guide as to how much time to spend on each question.
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.
2025 Pearson Edexcel As level Chemistry Question Paper Option 1 June+ Mark scheme

, 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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4
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