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

Chemistry 0620/31 Oct/Nov 2020 past paper

Cambridge IGCSE Chemistry (0620) Paper 3 (Theory (Core)), variant 1, Oct/Nov 2020: 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: 42

Open the question paper Mark scheme

File names: 0620_w20_qp_31 · 0620_w20_ms_31

Grade thresholds for 0620/31 Oct/Nov 2020

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
42	36	28	22	16

Topics in this paper

Which syllabus chapters 0620/31 Oct/Nov 2020 tested, by marks. Each chapter links to every past-paper question on it.

Chapter	Questions	Marks
Atoms, elements and compounds	2	16
Acids, bases and salts	1	14
The Periodic Table	1	12
Organic chemistry	1	10
Electrochemistry	1	10
Chemical reactions	1	10
Chemistry of the environment	1	8

Questions in 0620/31 Oct/Nov 2020

Question 1Atoms, elements and compounds · 10 marks
(a) The diagram shows part of the Periodic Table. I II III IV V VI VII VIII Mg Ca Cr Fe Cu Zn Al Cl Br …
Question 2Chemistry of the environment · 8 marks
The table shows the mass of air pollutants, in nanograms, in 1000 cm3 samples of air taken over a four month period. mass of pollutant in 1000 cm3 of air / nanograms month oxides of nitrogen sulfur dioxide carbon monoxide …
Question 3Atoms, elements and compounds · 6 marks
Some properties of four substances, …
Question 4Acids, bases and salts · 14 marks
The structure of tartaric acid is shown. …
Question 5Organic chemistry · 10 marks
Ethene is an alkene. (a) Draw the structure of ethene to show all of the atoms and all of the bonds. (b) Ethene reacts with aqueous bromine. State the colour change observed when ethene reacts with aqueous bromine. from …
Question 6Electrochemistry · 10 marks
Electrolysis is used to extract metals from metal compounds. (a) Describe the electrolysis of molten lead(II) bromide. In your answer include: …
Question 7Chemical reactions · 10 marks
Catalysts increase the rate of chemical reactions. (a) Name the type of metals often used as catalysts. (b) A student investigated the reaction of zinc powder with excess dilute hydrochloric acid in the absence of a catalyst. Zn + 2HCl …
Question 8The Periodic Table · 12 marks
This question is about metals and compounds of metals. (a) Identify two correct statements about transition elements. Tick two boxes. All transition elements are metals which are brown in colour. Transition elements have high densities. Compounds of transition elements are …

Other Chemistry papers from Oct/Nov 2020

Questions students ask

Where can I get the 0620/31 Oct/Nov 2020 mark scheme?

Open the mark scheme above - it is the official Cambridge scheme for this exact paper (0620_w20_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 2020?

42 marks out of 80, a C needed 28.

Which topics came up in 0620/31 Oct/Nov 2020?

Mostly Atoms, elements and compounds, Acids, bases and salts, The Periodic Table. The full list is in the table above.

Do I need an account to open 0620/31 Oct/Nov 2020?

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.