Cambridge O Level · 5070 · Paper 2 · Theory

Chemistry 5070/21 Oct/Nov 2020 past paper

Cambridge O Level Chemistry (5070) Paper 2 (Theory), variant 1, Oct/Nov 2020: the question paper and its official mark scheme, 9 questions worth 85 marks, with the grade thresholds. Free to open, no account needed.

Questions: 9
Marks: 75
Grade A from: 43

Open the question paper Mark scheme

File names: 5070_w20_qp_21 · 5070_w20_ms_21

Grade thresholds for 5070/21 Oct/Nov 2020

The minimum raw marks Cambridge set for each grade on this component (out of 75). Thresholds change every session and variant, so always compare your score with the paper you actually sat.

A	B	C	D	E
43	32	21	17	13

Topics in this paper

Which syllabus chapters 5070/21 Oct/Nov 2020 tested, by marks. Each chapter links to every past-paper question on it.

Chapter	Questions	Marks
Electrochemistry	2	23
Organic chemistry	2	20
Acids, bases and salts	1	10
Chemical reactions	1	10
States of matter	1	9
The Periodic Table	1	8
Chemistry of the environment	1	5

Questions in 5070/21 Oct/Nov 2020

Question 1Chemistry of the environment · 5 marks
Choose from the following compounds to answer the questions. aluminium iodide ethanol glucose lead(IV) chloride lithium bromide magnesium carbonate methane potassium phosphate silver nitrate sodium sulfate sulfur dioxide Each compound may be used once, more than once or not at …
Question 2Organic chemistry · 10 marks
Part of the structures of carbon dioxide and calcium carbide are shown. …
Question 3Electrochemistry · 13 marks
This question is about copper and copper compounds. (a) Copper is a metal. Explain why copper conducts electricity. (b) Describe a test for copper(II) ions. test observations (c) Aqueous copper(II) sulfate is electrolysed using graphite electrodes. (i) Describe what is …
Question 4States of matter · 9 marks
This question is about halogens and halogen compounds. (a) A drop of bromine liquid was placed in a sealed glass jar. After a time, the colour of the bromine had spread throughout the jar. Explain this observation in terms of …
Question 5The Periodic Table · 8 marks
Platinum and vanadium are both transition elements. (a) Transition elements are metals which are hard, strong and have high melting points and boiling points. State two other properties which are typical of transition elements but not of all metals. …
Question 6Organic chemistry · 10 marks
(a) The table shows some properties of five alcohols. alcohol formula density in g / cm3 boiling point in °C methanol CH3OH 0.791 65 ethanol C2H5OH 0.789 79 propanol C3H7OH 0.803 97 butanol C4H9OH 0.810 117 pentanol C5H11OH …
Question 7Electrochemistry · 10 marks
Aluminium is extracted by the electrolysis of molten aluminium oxide. (a) (i) Explain why aluminium is extracted by electrolysis and not by reduction with carbon. (ii) The electrolyte is a mixture of aluminium oxide and cryolite. Explain the purpose of …
Question 8Acids, bases and salts · 10 marks
(a) Dilute nitric acid reacts with aqueous barium hydroxide. 2HNO3(aq) + Ba(OH)2(aq) Ba(NO3)2(aq) …
Question 9Chemical reactions · 10 marks
Calcium is a metal in Group II of the Periodic Table. (a) Calcium can be used as a reducing agent. Describe a test for reducing agents. test observations (b) An ion of calcium has the symbol 44 20Ca2+ Deduce the …

Other Chemistry papers from Oct/Nov 2020

Questions students ask

Where can I get the 5070/21 Oct/Nov 2020 mark scheme?

Open the mark scheme above - it is the official Cambridge scheme for this exact paper (5070_w20_ms_21), and on a wide screen it sits beside the question you are reading.

What was the grade threshold for an A in 5070/21 Oct/Nov 2020?

43 marks out of 75, a C needed 21.

Which topics came up in 5070/21 Oct/Nov 2020?

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

Do I need an account to open 5070/21 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.