Cambridge O Level · 5070 · Paper 2 · Theory

Chemistry 5070/21 May/June 2018 past paper

Cambridge O Level Chemistry (5070) Paper 2 (Theory), variant 1, May/June 2018: 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: 49

Open the question paper Mark scheme

File names: 5070_s18_qp_21 · 5070_s18_ms_21

Grade thresholds for 5070/21 May/June 2018

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
49	36	23	18	12

Topics in this paper

Which syllabus chapters 5070/21 May/June 2018 tested, by marks. Each chapter links to every past-paper question on it.

Chapter	Questions	Marks
Acids, bases and salts	2	21
States of matter	1	11
The Periodic Table	1	10
Electrochemistry	1	10
Chemical reactions	1	10
Stoichiometry	1	10
Organic chemistry	1	7
Chemistry of the environment	1	6

Questions in 5070/21 May/June 2018

Question 1Chemistry of the environment · 6 marks
Choose from the gases to answer the questions. argon carbon dioxide carbon monoxide ethane hydrogen methane neon ozone sulfur dioxide sulfur trioxide Each gas can be used once, more than once or not at all. Which gas: (a) is used …
Question 2The Periodic Table · 10 marks
The elements in Group VII of the Periodic Table are called the halogens. (a) Explain why the elements in Group VII have similar chemical properties. (b) A redox reaction happens when chlorine gas is bubbled through aqueous potassium iodide. Cl2(g) …
Question 3Acids, bases and salts · 11 marks
Barium chloride is a soluble salt and barium sulfate is an insoluble salt. (a) Barium sulfate can be prepared by the reaction between aqueous barium chloride and dilute sulfuric acid. (i) Describe the preparation of a pure, dry sample of …
Question 4Organic chemistry · 7 marks
This question is about ethanol and ethanoic acid. …
Question 5States of matter · 11 marks
Silicon is a non-metal found in Group IV of the Periodic Table. (a) Silicon is manufactured by the reduction of silicon dioxide with carbon. SiO2 + 2C Si + 2CO What is the maximum mass of silicon that can be …
Question 6Electrochemistry · 10 marks
Copper pyrites is an ore containing compounds of copper. One of the compounds in the ore is CuFeS2. (a) Calculate the mass of copper in 20.0 tonnes of CuFeS2. mass of copper tonnes (b) CuFeS2 is heated in air. Copper(II) …
Question 7Chemical reactions · 10 marks
A scientist investigates the reaction of iron with steam in a closed system. A dynamic equilibrium mixture is established. 3Fe(s) + 4H2O(g) Fe3O4(s) …
Question 8Acids, bases and salts · 10 marks
Methanesulfonic acid has the structure shown. …
Question 9Stoichiometry · 10 marks
Methylpropane is a saturated hydrocarbon. …

Other Chemistry papers from May/June 2018

Questions students ask

Where can I get the 5070/21 May/June 2018 mark scheme?

Open the mark scheme above - it is the official Cambridge scheme for this exact paper (5070_s18_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 May/June 2018?

49 marks out of 75, a C needed 23.

Which topics came up in 5070/21 May/June 2018?

Mostly Acids, bases and salts, States of matter, The Periodic Table. The full list is in the table above.

Do I need an account to open 5070/21 May/June 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.