Cambridge IGCSE · 0620 · Paper 4 · Theory (Extended)
Chemistry 0620/42 Oct/Nov 2022 past paper
Cambridge IGCSE Chemistry (0620) Paper 4 (Theory (Extended)), variant 2, Oct/Nov 2022: the question paper and its official mark scheme, 6 questions worth 80 marks, with the grade thresholds. Free to open, no account needed.
- Questions
- 6
- Marks
- 80
- Grade A from
- 48
File names: 0620_w22_qp_42 · 0620_w22_ms_42
Grade thresholds for 0620/42 Oct/Nov 2022
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 | F | G |
|---|---|---|---|---|---|---|
| 48 | 38 | 29 | 24 | 18 | 13 | 8 |
Topics in this paper
Which syllabus chapters 0620/42 Oct/Nov 2022 tested, by marks. Each chapter links to every past-paper question on it.
| Chapter | Questions | Marks |
|---|---|---|
| Acids, bases and salts | 2 | 34 |
| Chemical reactions | 1 | 16 |
| Organic chemistry | 1 | 12 |
| Chemical energetics | 1 | 10 |
| Chemistry of the environment | 1 | 8 |
Questions in 0620/42 Oct/Nov 2022
- Question 1
Diamond and graphite are different solid forms of carbon. The carbon atoms in diamond and graphite are arranged in different ways. (a) State the number of covalent bonds each carbon atom has in diamond. (b) State the term used to …
- Question 2
Sodium is a reactive metal. (a) Suggest why sodium is stored under oil. (b) Sodium burns in air to form sodium oxide, Na2O. (i) State the term given to a reaction in which a substance burns. (ii) State the colour …
- Question 3
Sulfuric acid is manufactured by an industrial process. Sulfur is obtained from sulfur-containing metal ores. The sulfur in the metal ore is converted to sulfur dioxide which is then oxidised to sulfur trioxide as shown. 2SO2(g) + O2(g) 2SO3(g) (a) …
- Question 4
A student prepares magnesium sulfate crystals, MgSO4, by adding excess magnesium to dilute sulfuric acid. (a) Write the chemical equation for this reaction. (b) Describe two observations which show the reaction has finished. …
- Question 5
Ethane is an alkane which undergoes a photochemical reaction with chlorine as shown. C2H6(g) + Cl 2(g) → C2H5Cl (l) + HCl (g) (a) Write the general formula of alkanes. (b) State why this reaction is described as a photochemical …
- Question 6
A carboxylic acid Y has the structure shown. …
Other Chemistry papers from Oct/Nov 2022
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