Disclaimer: This document was created by department heads with many years of experience teaching the
Pearson Edexcel IGCSE Chemistry course. We cannot however guarantee that it is an accurate representation
of the Summer 2025 examinations and students should not treat it as such. Please use this as an aid, alongside
other methods of revision.
Pearson Edexcel International GCSE (9-1)
Monday 19 May 2025
Morning (Time: 2 hours)
Chemistry
Unit: 4CH1
Paper: 1C
You must have:
Calculator, ruler
Instructions
• Use black ink or a ballpoint pen.
• Answer all questions.
• Answer the questions in the spaces provided.
○ There may be more space than you need.
• Show all the steps in any calculations and state the units.
Information
• The total mark for this paper is 110.
• The marks for each question are shown in brackets.
○ Use this as a guide as to how much time to spend on each question.
Advice
• Read each question carefully before you start to answer it.
• Write your answers neatly and in good English.
• Try to answer every question.
• Check your answers if you have time at the end.
Turn over →
© 2025 Empirical Tuition. All rights reserved.
, Answer all questions.
1. This question is about chlorine.
The diagram below represents the electronic configuration of an atom of chlorine.
(a) What is the electronic configuration of a chlorine atom? (1)
☒ A 2, 7
☒ B 2, 8, 7
☒ C 2, 8, 8
☒ D 17
(b) Which period of the periodic table does chlorine belong to? (1)
☒ A 2
☒ B 3
☒ C 4
☒ D 5
2
, (c) What is the charge on a chloride ion? (1)
☒ A 1-
☒ B 1+
☒ C 0
☒ D 2+
(d) Describe a simple test to prove that a gas is chlorine. (2)
When heated, magnesium reacts with chlorine to form the compound magnesium chloride (MgCl2).
(e) Calculate the relative formula mass (Mr) of magnesium chloride. Use the following relative atomic
masses: Mg = 24, Cl = 35.5. (2)
(Total for Question 1 = 7 marks)
2. Aspirin is a common painkiller used to reduce fever and inflammation.
The molecular formula of aspirin is C9H8O4.
3
Pearson Edexcel IGCSE Chemistry course. We cannot however guarantee that it is an accurate representation
of the Summer 2025 examinations and students should not treat it as such. Please use this as an aid, alongside
other methods of revision.
Pearson Edexcel International GCSE (9-1)
Monday 19 May 2025
Morning (Time: 2 hours)
Chemistry
Unit: 4CH1
Paper: 1C
You must have:
Calculator, ruler
Instructions
• Use black ink or a ballpoint pen.
• Answer all questions.
• Answer the questions in the spaces provided.
○ There may be more space than you need.
• Show all the steps in any calculations and state the units.
Information
• The total mark for this paper is 110.
• The marks for each question are shown in brackets.
○ Use this as a guide as to how much time to spend on each question.
Advice
• Read each question carefully before you start to answer it.
• Write your answers neatly and in good English.
• Try to answer every question.
• Check your answers if you have time at the end.
Turn over →
© 2025 Empirical Tuition. All rights reserved.
, Answer all questions.
1. This question is about chlorine.
The diagram below represents the electronic configuration of an atom of chlorine.
(a) What is the electronic configuration of a chlorine atom? (1)
☒ A 2, 7
☒ B 2, 8, 7
☒ C 2, 8, 8
☒ D 17
(b) Which period of the periodic table does chlorine belong to? (1)
☒ A 2
☒ B 3
☒ C 4
☒ D 5
2
, (c) What is the charge on a chloride ion? (1)
☒ A 1-
☒ B 1+
☒ C 0
☒ D 2+
(d) Describe a simple test to prove that a gas is chlorine. (2)
When heated, magnesium reacts with chlorine to form the compound magnesium chloride (MgCl2).
(e) Calculate the relative formula mass (Mr) of magnesium chloride. Use the following relative atomic
masses: Mg = 24, Cl = 35.5. (2)
(Total for Question 1 = 7 marks)
2. Aspirin is a common painkiller used to reduce fever and inflammation.
The molecular formula of aspirin is C9H8O4.
3
