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

Chemistry 0620/31 May/June 2021 past paper

Cambridge IGCSE Chemistry (0620) Paper 3 (Theory (Core)), variant 1, May/June 2021: 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: 38

Open the question paper Mark scheme

File names: 0620_s21_qp_31 · 0620_s21_ms_31

Grade thresholds for 0620/31 May/June 2021

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
38	30	22	14	6

Topics in this paper

Which syllabus chapters 0620/31 May/June 2021 tested, by marks. Each chapter links to every past-paper question on it.

Chapter	Questions	Marks
Experimental techniques and chemical analysis	1	15
Chemistry of the environment	1	13
The Periodic Table	1	11
States of matter	1	10
Organic chemistry	1	10
Acids, bases and salts	1	9
Atoms, elements and compounds	1	8
Electrochemistry	1	4

Questions in 0620/31 May/June 2021

Question 1Atoms, elements and compounds · 8 marks
(a) The electronic structures of five atoms, …
Question 2Experimental techniques and chemical analysis · 15 marks
The table shows the masses of some of the ions in 1000 cm3 of fruit juice. name of ion formula of ion mass of ion in 1000 cm3 of fruit juice / mg NH4 + 43 calcium Ca2+ 79 chloride …
Question 3States of matter · 10 marks
The table shows some properties of four Group I elements. element melting point / °C boiling point / °C atomic radius / nm sodium …
Question 4Organic chemistry · 10 marks
The structure of malic acid is shown. …
Question 5Chemistry of the environment · 13 marks
(a) Calcium oxide is made by the thermal decomposition of calcium carbonate. (i) State the meaning of the term thermal decomposition. (ii) Describe a test for calcium ions. test observations (b) Carbon dioxide is produced when dilute hydrochloric acid …
Question 6Acids, bases and salts · 9 marks
This question is about water. (a) The water in rivers often contains pollutants such as acids. Describe how universal indicator paper can be used to determine the pH value of the water. (b) The diagram shows some of the stages …
Question 7Electrochemistry · 4 marks
(a) Molten lead(II) bromide is electrolysed using carbon electrodes. (i) State the products of this electrolysis at: the negative electrode the positive electrode. (ii) State the name of another substance which can be used as an inert electrode. (b) …
Question 8The Periodic Table · 11 marks
This question is about elements in the Periodic Table. (a) The table shows some properties of five elements, …

Other Chemistry papers from May/June 2021

Questions students ask

Where can I get the 0620/31 May/June 2021 mark scheme?

Open the mark scheme above - it is the official Cambridge scheme for this exact paper (0620_s21_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 2021?

38 marks out of 80, a C needed 22.

Which topics came up in 0620/31 May/June 2021?

Mostly Experimental techniques and chemical analysis, Chemistry of the environment, The Periodic Table. The full list is in the table above.

Do I need an account to open 0620/31 May/June 2021?

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.