Cambridge IGCSE · 0620 · Paper 4 · Theory (Extended)
Chemistry 0620/42 May/June 2025 past paper
Cambridge IGCSE Chemistry (0620) Paper 4 (Theory (Extended)), variant 2, May/June 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
- 57
File names: 0620_s25_qp_42 · 0620_s25_ms_42
Grade thresholds for 0620/42 May/June 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 |
|---|---|---|---|---|---|---|
| 57 | 45 | 32 | 27 | 22 | 17 | 12 |
Topics in this paper
Which syllabus chapters 0620/42 May/June 2025 tested, by marks. Each chapter links to every past-paper question on it.
| Chapter | Questions | Marks |
|---|---|---|
| Atoms, elements and compounds | 3 | 38 |
| Chemical reactions | 2 | 27 |
| Electrochemistry | 1 | 15 |
Questions in 0620/42 May/June 2025
- Question 1
Using numbers only, state the: (a) percentage of nitrogen in clean, dry air (b) typical operating temperature of the Contact process in °C (c) number of metals in Period 3 of the Periodic Table (d) number of halogens which are …
- Question 2
This question is about covalent compounds. (a) State what is meant by a covalent bond. (b) Chlorine(I) oxide, Cl 2O, is a simple molecule with covalent bonds. (i) State what is meant by (I) in the name chlorine(I) oxide. (ii) …
- Question 3
This question is about electrolysis. (a) Complete the definition of electrolysis by filling in the missing words. The decomposition of compounds when or by the passage of an electric current. (b) Electrolysis of aqueous copper(II) sulfate is carried out using …
- Question 4
Chromium is the element with atomic number 24 in the Periodic Table. (a) The main ore of chromium is chromite. Chromite contains FeCr2O4. FeCr2O4 reacts with carbon. (i) Complete the equation for this reaction. FeCr2O4 + 4C Fe + 2Cr …
- Question 5
Alkali metals are reactive elements. (a) State the group number of the alkali metals. (b) Identify the alkali metal which: (i) has the highest melting point (ii) has the highest density (iii) has the lowest reactivity (iv) burns with a …
- Question 6
Ethene, C2H4, is the first member of a family of similar compounds which contains the alkene functional group. (a) State the term for a family of similar compounds which contain the same functional group. (b) Determine the difference in relative …
Other Chemistry papers from May/June 2025
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- 0620/12 Multiple choice (Core)
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- 0620/21 Multiple choice (Extended)
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- 0620/31 Theory (Core)
- 0620/32 Theory (Core)
- 0620/33 Theory (Core)
- 0620/41 Theory (Extended)
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- 0620/61 Alternative to Practical
- 0620/62 Alternative to Practical
- 0620/63 Alternative to Practical