Cambridge IGCSE · 0620 · Paper 4 · Theory (Extended)
Chemistry 0620/43 Oct/Nov 2025 past paper
Cambridge IGCSE Chemistry (0620) Paper 4 (Theory (Extended)), variant 3, Oct/Nov 2025: 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
- 55
File names: 0620_w25_qp_43 · 0620_w25_ms_43
Grade thresholds for 0620/43 Oct/Nov 2025
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 |
|---|---|---|---|---|---|---|
| 55 | 43 | 30 | 26 | 21 | 17 | 13 |
Topics in this paper
Which syllabus chapters 0620/43 Oct/Nov 2025 tested, by marks. Each chapter links to every past-paper question on it.
| Chapter | Questions | Marks |
|---|---|---|
| Metals | 1 | 17 |
| Chemical reactions | 1 | 17 |
| Organic chemistry | 1 | 17 |
| The Periodic Table | 1 | 12 |
| Atoms, elements and compounds | 1 | 9 |
| States of matter | 1 | 8 |
Questions in 0620/43 Oct/Nov 2025
- Question 1
Atoms and ions are made from particles called electrons, neutrons and protons. (a) Complete Table 1.1. Table 1.1 particle relative charge relative mass electron …
- Question 2
Table 2.1 shows the melting points, boiling points and electrical conductivities of seven substances, …
- Question 3
This question is about aluminium and other metallic elements. (a) Aluminium is extracted from purified bauxite by electrolysis. Fig. 3.1 shows a diagram of the electrolytic cell used. waste gases negative electrode aluminium electrolyte positive electrodes Fig. 3.1 (i) State …
- Question 4
This question is about chlorine and compounds of chlorine. (a) Gaseous chlorine reacts with gaseous phosphorus(III) chloride to form gaseous phosphorus(V) chloride. The reaction is a reversible reaction. When the three gases are in a closed container the system reaches …
- Question 5
This question is about metallic compounds. (a) Insoluble metal salts, such as lead(II) sulfate, are made by precipitation. When aqueous lead(II) ions react with aqueous sulfate ions, a precipitate of lead(II) sulfate forms. A sample of pure lead(II) sulfate can …
- Question 6
This question is about organic compounds. (a) Organic compound Q has the following composition by mass. …
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