Cambridge IGCSE · 0620 · Paper 3 · Theory (Core)

Chemistry 0620/31 May/June 2025 past paper

Cambridge IGCSE Chemistry (0620) Paper 3 (Theory (Core)), variant 1, May/June 2025: the question paper and its official mark scheme, 8 questions worth 80 marks, with the grade thresholds. Free to open, no account needed.

Questions: 8
Marks: 80
Grade A from: 44

Open the question paper Mark scheme

File names: 0620_s25_qp_31 · 0620_s25_ms_31

Grade thresholds for 0620/31 May/June 2025

The minimum raw marks Cambridge set for each grade on this component (out of 80). Thresholds change every session and variant, so always compare your score with the paper you actually sat.

A	B	C	D	E
44	35	26	17	8

Topics in this paper

Which syllabus chapters 0620/31 May/June 2025 tested, by marks. Each chapter links to every past-paper question on it.

Chapter	Questions	Marks
Stoichiometry	2	18
Metals	2	15
Organic chemistry	1	14
Electrochemistry	1	14
Atoms, elements and compounds	1	12
Chemical energetics	1	7

Questions in 0620/31 May/June 2025

Question 1Metals · 8 marks
A list of substances is shown. aluminium ammonia argon bromine carbon dioxide fluorine iron magnesium magnesium chloride nitrogen oxygen potassium Answer the following questions about these substances. Each substance may be used once, more than once or not at all. …
Question 2Atoms, elements and compounds · 12 marks
This question is about sea water and the substances found in sea water. (a) Table 2.1 shows the masses of the compounds formed when 1000 cm3 of sea water is evaporated. Table 2.1 compound formula mass of compound / g …
Question 3Stoichiometry · 11 marks
This question is about sulfur and its compounds. (a) (i) Explain why sulfur is placed in Group VI of the Periodic Table. (ii) Two isotopes of sulfur are shown in Fig. …
Question 4Organic chemistry · 14 marks
This question is about organic chemistry. (a) (i) Name the process that separates petroleum into its useful components. (ii) Fuel oil is obtained from petroleum. State one use of fuel oil. (iii) Natural gas is a fossil fuel. Draw a …
Question 5Metals · 7 marks
This question is about metals and their reactions. (a) A student investigates the reaction of four different metals, …
Question 6Electrochemistry · 14 marks
This question is about ionic and covalent compounds. (a) Complete the word equation to show the reaction between magnesium carbonate and nitric acid. magnesium carbonate + nitric acid …
Question 7Chemical energetics · 7 marks
This question is about energy changes in reactions. (a) Table 7.1 shows the results of four experiments. Table 7.1 experiment initial temperature / °C final temperature …
Question 8Stoichiometry · 7 marks
This question is about water and air. (a) River water needs to be treated to make it safe to drink. Two of the stages used in the treatment of domestic water are the addition of carbon and chlorination. Describe the …

Other Chemistry papers from May/June 2025

Questions students ask

Where can I get the 0620/31 May/June 2025 mark scheme?

Open the mark scheme above - it is the official Cambridge scheme for this exact paper (0620_s25_ms_31), and on a wide screen it sits beside the question you are reading.

What was the grade threshold for an A in 0620/31 May/June 2025?

44 marks out of 80, a C needed 26.

Which topics came up in 0620/31 May/June 2025?

Mostly Stoichiometry, Metals, Organic chemistry. The full list is in the table above.

Do I need an account to open 0620/31 May/June 2025?

No. Every paper opens for free without signing in. A free account also saves your pen marks and records your score against the grade thresholds.