Cambridge IGCSE · 0620 · Paper 4 · Theory (Extended)
Chemistry 0620/42 Feb/March 2025 past paper
Cambridge IGCSE Chemistry (0620) Paper 4 (Theory (Extended)), variant 2, Feb/March 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
- 61
File names: 0620_m25_qp_42 · 0620_m25_ms_42
Grade thresholds for 0620/42 Feb/March 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 |
|---|---|---|---|---|---|---|
| 61 | 51 | 40 | 34 | 28 | 21 | 14 |
Topics in this paper
Which syllabus chapters 0620/42 Feb/March 2025 tested, by marks. Each chapter links to every past-paper question on it.
| Chapter | Questions | Marks |
|---|---|---|
| Atoms, elements and compounds | 2 | 23 |
| Electrochemistry | 1 | 16 |
| Chemical reactions | 1 | 14 |
| Organic chemistry | 1 | 14 |
| The Periodic Table | 1 | 13 |
Questions in 0620/42 Feb/March 2025
- Question 1
Using numbers only, state the: (a) percentage of oxygen in clean, dry air (b) typical operating temperature, in °C, used in the Haber process (c) number of atoms in a diatomic molecule (d) maximum number of electrons in the second …
- Question 2
This question is about ionic compounds. (a) State what is meant by the term ionic bond. (b) Potassium sulfide, K2S, is an ionic compound. Complete the dot-and-cross diagram in Fig. 2.1 of the ions in potassium sulfide. Show the charges …
- Question 3
The halogens are a group of elements in the Periodic Table. Chlorine is a member of this group. (a) State the group number of the halogens. (b) State how many halogens there are in this group. (c) Suggest the identity …
- Question 4
Carbonyl chloride, COCl 2, is manufactured by reacting carbon monoxide with chlorine. CO(g) + Cl 2(g) COCl …
- Question 5
Manganese is the element with atomic number 25 in the Periodic Table. Calcium is the element with atomic number 20 in the Periodic Table. (a) Complete Table 5.1 to show the number of protons, neutrons and electrons in the 55Mn …
- Question 6
The structural formulae of two compounds, A and B, are shown. A B CH2=CHCH3 CH3CH=CHCH3 A and B are members of the same homologous series. (a) Give two reasons why the structural formulae of A and B show they are …
Other Chemistry papers from Feb/March 2025
- 0620/12 Multiple choice (Core)
- 0620/22 Multiple choice (Extended)
- 0620/32 Theory (Core)
- 0620/62 Alternative to Practical