Cambridge O Level · 5070 · Paper 2 · Theory

Chemistry 5070/22 May/June 2018 past paper

Cambridge O Level Chemistry (5070) Paper 2 (Theory), variant 2, May/June 2018: the question paper and its official mark scheme, 10 questions worth 85 marks, with the grade thresholds. Free to open, no account needed.

Questions: 10
Marks: 75
Grade A from: 51

Open the question paper Mark scheme

File names: 5070_s18_qp_22 · 5070_s18_ms_22

Grade thresholds for 5070/22 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
51	37	23	18	12

Topics in this paper

Which syllabus chapters 5070/22 May/June 2018 tested, by marks. Each chapter links to every past-paper question on it.

Chapter	Questions	Marks
Acids, bases and salts	2	20
Chemical reactions	2	17
Organic chemistry	2	15
Metals	1	10
Stoichiometry	1	10
Atoms, elements and compounds	1	8
Chemistry of the environment	1	5

Questions in 5070/22 May/June 2018

Question 1Chemistry of the environment · 5 marks
Choose from the gases to answer the questions. ammonia carbon dioxide chlorine butane hydrogen nitrogen oxygen propane sulfur dioxide Each gas can be used once, more than once or not at all. Which gas: (a) burns in air to give …
Question 2Chemical reactions · 7 marks
The transition elements occupy the central block of the Periodic Table. Iron and copper are typical transition elements. (a) The compounds of transition elements are often coloured. What is the colour of iron(III) hydroxide? (b) A redox reaction happens when …
Question 3Acids, bases and salts · 10 marks
Silver chloride, AgCl, is an insoluble salt and silver nitrate is a soluble salt. (a) Silver chloride can be prepared by the reaction between aqueous silver nitrate and dilute hydrochloric acid. (i) Describe the preparation of a pure, dry sample …
Question 4Atoms, elements and compounds · 8 marks
Phosphorus is a non-metal in Group V of the Periodic Table. (a) Phosphorus can be manufactured from calcium phosphate, Ca3(PO4)2. 2Ca3(PO4)2 + 6SiO2 + 10C 6CaSiO3 + 10CO + P4 What is the maximum mass of phosphorus that can be …
Question 5Organic chemistry · 10 marks
Naphtha is a fraction obtained from petroleum (crude oil). (a) Explain how naphtha is obtained from petroleum (crude oil). (b) One compound in the naphtha fraction has the formula C12H26. (i) From this formula, how can you deduce that this …
Question 6Organic chemistry · 5 marks
The diagram shows the partial structure of a polyester. …
Question 7Metals · 10 marks
Sphalerite is an ore containing compounds of zinc. One of the compounds in the ore is ZnS. (a) Calculate the mass of zinc in 30.0 tonnes of ZnS. mass of zinc tonnes (b) ZnS is heated in air. Zinc oxide …
Question 8Chemical reactions · 10 marks
A scientist investigates the thermal decomposition of calcium carbonate in a closed system. A dynamic equilibrium mixture is established. CaCO3(s) CaO(s) + CO2(g) (a) What is meant by the term dynamic equilibrium? (b) The pressure of the equilibrium mixture is …
Question 9Acids, bases and salts · 10 marks
Sulfamic acid has the structure shown. …
Question 10Stoichiometry · 10 marks
Ester A has the structure shown. …

Other Chemistry papers from May/June 2018

Questions students ask

Where can I get the 5070/22 May/June 2018 mark scheme?

Open the mark scheme above - it is the official Cambridge scheme for this exact paper (5070_s18_ms_22), and on a wide screen it sits beside the question you are reading.

What was the grade threshold for an A in 5070/22 May/June 2018?

51 marks out of 75, a C needed 23.

Which topics came up in 5070/22 May/June 2018?

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

Do I need an account to open 5070/22 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.