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

Chemistry 0620/31 Oct/Nov 2018 past paper

Cambridge IGCSE Chemistry (0620) Paper 3 (Theory (Core)), variant 1, Oct/Nov 2018: 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: 53

Open the question paper Mark scheme

File names: 0620_w18_qp_31 · 0620_w18_ms_31

Grade thresholds for 0620/31 Oct/Nov 2018

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
53	46	38	31	24

Topics in this paper

Which syllabus chapters 0620/31 Oct/Nov 2018 tested, by marks. Each chapter links to every past-paper question on it.

Chapter	Questions	Marks
Acids, bases and salts	3	29
Stoichiometry	2	19
Electrochemistry	1	13
Organic chemistry	1	11
Atoms, elements and compounds	1	8

Questions in 0620/31 Oct/Nov 2018

Question 1Atoms, elements and compounds · 8 marks
(a) The electronic structures of five atoms, …
Question 2Stoichiometry · 9 marks
(a) The table shows the ions present in a 1000 cm3 sample of blood plasma. ion present formula of ion mass present in the 1000 cm3 sample / g sodium Na+ 3.25 potassium K+ 0.16 calcium Ca2+ 0.10 magnesium Mg2+ …
Question 3Acids, bases and salts · 11 marks
(a) The apparatus used for distillation is shown. aqueous copper(II) sulfate thermometer flask (i) Complete the box to name the apparatus. (ii) Describe and explain how the water is separated from the aqueous copper(II) sulfate by distillation. (b) A sample …
Question 4Organic chemistry · 11 marks
(a) The structure of citraconic acid is shown. …
Question 5Electrochemistry · 13 marks
(a) Some of the changes of state of water are shown. ice water water vapour P freezing Q evaporation (i) Give the names of the changes of state represented by P and …
Question 6Acids, bases and salts · 10 marks
(a) The diagrams show the structures of four substances, …
Question 7Acids, bases and salts · 8 marks
(a) A student investigates the reaction of calcium carbonate with dilute hydrochloric acid. CaCO3 + 2HCl CaCl 2 + CO2 + H2O The student measures the mass of the reaction mixture at 10 second intervals using the apparatus shown. 250.00 …
Question 8Stoichiometry · 10 marks
Glass can be made by heating a mixture of sand, sodium carbonate and limestone (calcium carbonate). (a) (i) Calculate the relative formula mass of sodium carbonate, Na2CO3. Show all your working. Use your Periodic Table to help you. relative …

Other Chemistry papers from Oct/Nov 2018

Questions students ask

Where can I get the 0620/31 Oct/Nov 2018 mark scheme?

Open the mark scheme above - it is the official Cambridge scheme for this exact paper (0620_w18_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 2018?

53 marks out of 80, a C needed 38.

Which topics came up in 0620/31 Oct/Nov 2018?

Mostly Acids, bases and salts, Stoichiometry, Electrochemistry. The full list is in the table above.

Do I need an account to open 0620/31 Oct/Nov 2018?

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.