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

Chemistry 0620/31 Oct/Nov 2021 past paper

Cambridge IGCSE Chemistry (0620) Paper 3 (Theory (Core)), variant 1, Oct/Nov 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: 45

Open the question paper Mark scheme

File names: 0620_w21_qp_31 · 0620_w21_ms_31

Grade thresholds for 0620/31 Oct/Nov 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
45	39	33	27	22

Topics in this paper

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

Chapter	Questions	Marks
Organic chemistry	2	18
Acids, bases and salts	2	16
Metals	1	16
Chemistry of the environment	1	13
Electrochemistry	1	9
Chemical reactions	1	8

Questions in 0620/31 Oct/Nov 2021

Question 1Acids, bases and salts · 8 marks
(a) A list of formulae is shown. Al Cl 3 CaCO3 CO CO2 CoCl 2 CuSO4 MgCl 2 N2 NaCl NH3 O2 SO2 Answer the following questions using these formulae. Each formula may be used once, more than once or …
Question 2Organic chemistry · 9 marks
The table shows the masses of some of the ions in 1000 cm3 of rainwater. name of ion formula of ion mass of ion in 1000 cm3 of rainwater / mg NH4 + 0.08 calcium Ca2+ 0.13 chloride Cl – …
Question 3Metals · 16 marks
The diagram shows a blast furnace used in the extraction of iron. mixture of iron ore, coke and limestone molten slag molten iron …
Question 4Acids, bases and salts · 8 marks
The table shows some properties of the Group I elements. element melting point / °C density in g / cm3 observations during reaction with water lithium 181 slow bubbling no flame sodium 98 rapid bubbling no flame potassium 63 0.86 …
Question 5Organic chemistry · 9 marks
The table shows the structures of some organic compounds. compound structure of compound homologous series …
Question 6Electrochemistry · 9 marks
The diagram shows part of the structures of sodium bromide and graphite at room temperature and pressure. Na+ Br – Na+ Br – Na+ Br – Na+ Br – Br – Na+ Na+ Br – (a) Describe the physical properties …
Question 7Chemistry of the environment · 13 marks
This question is about nitrogen and compounds of nitrogen. (a) When nitrogen is cooled to below –196 °C it changes state from gas to liquid. (i) Name the change of state from gas to liquid. (ii) Use the kinetic particle …
Question 8Chemical reactions · 8 marks
The rate of decomposition of aqueous hydrogen peroxide, H2O2, is increased by an enzyme. …

Other Chemistry papers from Oct/Nov 2021

Questions students ask

Where can I get the 0620/31 Oct/Nov 2021 mark scheme?

Open the mark scheme above - it is the official Cambridge scheme for this exact paper (0620_w21_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 Oct/Nov 2021?

45 marks out of 80, a C needed 33.

Which topics came up in 0620/31 Oct/Nov 2021?

Mostly Organic chemistry, Acids, bases and salts, Metals. The full list is in the table above.

Do I need an account to open 0620/31 Oct/Nov 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.