Cambridge O Level · 5070 · Paper 2 · Theory
Chemistry 5070/22 Oct/Nov 2020 past paper
Cambridge O Level Chemistry (5070) Paper 2 (Theory), variant 2, 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
- 45
File names: 5070_w20_qp_22 · 5070_w20_ms_22
Grade thresholds for 5070/22 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 |
|---|---|---|---|---|
| 45 | 34 | 22 | 16 | 10 |
Topics in this paper
Which syllabus chapters 5070/22 Oct/Nov 2020 tested, by marks. Each chapter links to every past-paper question on it.
| Chapter | Questions | Marks |
|---|---|---|
| Acids, bases and salts | 3 | 30 |
| Metals | 2 | 20 |
| Electrochemistry | 1 | 12 |
| Chemical reactions | 1 | 10 |
| Organic chemistry | 1 | 8 |
| Chemistry of the environment | 1 | 5 |
Questions in 5070/22 Oct/Nov 2020
- Question 1
Choose from the following compounds to answer these questions. aluminium sulfate ammonia calcium carbonate carbon dioxide chlorofluorocarbons copper(II) sulfate hydrogen chloride potassium nitrate sodium chloride Each compound may be used once, more than once or not at all. Which compound: …
- Question 2
Part of the structures of chlorine and sodium chloride are shown. Cl–Cl Cl–Cl Cl–Cl Cl–Cl Cl–Cl Na+ Na+ Na+ Na+ Na+ Na+ Na+ Na+ Cl – Cl – Cl – Cl – Cl – Cl – Cl – Cl – …
- Question 3
(a) A drop of black ink is placed at the bottom of a beaker of water. After a time, the colour of the ink spreads throughout the water. Explain this observation in terms of the kinetic particle theory. (b) In …
- Question 4
Water from natural sources contains dissolved substances which are not pollutants, such as mineral salts. (a) Name another substance found naturally in water which is not a mineral salt or a pollutant. (b) When lithium reacts with water, aqueous lithium …
- Question 5
Alkenes are made in an oil refinery by cracking hydrocarbons. (a) (i) Give one other reason why petroleum companies carry out cracking. (ii) Complete the equation for the cracking of tridecane, C13H28, to form propene, C3H6, and one other hydrocarbon. …
- Question 6
Methanoic acid and ethanoic acid are weak acids. (a) What does the term weak mean, when applied to acids? (b) Methanoic acid, HCO2H, reacts with magnesium powder. (i) Construct the equation for this reaction. (ii) State and explain how the …
- Question 7
Iron is extracted from iron ore in a blast furnace using limestone and coke (carbon). (a) Name a common ore of iron. (b) The coke burns to form carbon dioxide. This reaction is exothermic. Explain, in terms of bond making …
- Question 8
This question is about some compounds of sulfur. (a) Dilute sulfuric acid reacts with aqueous sodium hydroxide as shown. H2SO4(aq) + 2NaOH(aq) Na2SO4(aq) …
- Question 9
Lead is a metal in Group IV of the Periodic Table. (a) An ion of lead has the symbol 207 82 Pb2+ Deduce the number of electrons and neutrons in this ion. number of electrons number of neutrons (b) Lead(IV) …
Other Chemistry papers from Oct/Nov 2020
- 5070/11 Multiple choice
- 5070/12 Multiple choice
- 5070/21 Theory
- 5070/41 Alternative to Practical
- 5070/42 Alternative to Practical