Cambridge IGCSE · 0620 · Paper 3 · Theory (Core)
Chemistry 0620/33 May/June 2025 past paper
Cambridge IGCSE Chemistry (0620) Paper 3 (Theory (Core)), variant 3, May/June 2025: the question paper and its official mark scheme, 8 questions worth 80 marks, with the grade thresholds. Free to open, no account needed.
- Questions
- 8
- Marks
- 80
- Grade A from
- 45
File names: 0620_s25_qp_33 · 0620_s25_ms_33
Grade thresholds for 0620/33 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 |
|---|---|---|---|---|
| 45 | 36 | 27 | 18 | 9 |
Topics in this paper
Which syllabus chapters 0620/33 May/June 2025 tested, by marks. Each chapter links to every past-paper question on it.
| Chapter | Questions | Marks |
|---|---|---|
| Stoichiometry | 2 | 20 |
| Chemistry of the environment | 2 | 15 |
| Organic chemistry | 1 | 15 |
| Electrochemistry | 1 | 13 |
| Atoms, elements and compounds | 1 | 12 |
| Chemical energetics | 1 | 5 |
Questions in 0620/33 May/June 2025
- Question 1
A list of substances is shown. calcium calcium oxide carbon carbon dioxide chlorine copper gold iodine neon nitrogen oxygen potassium sulfur dioxide Answer the following questions about these substances. Each substance may be used once, more than once or not …
- Question 2
This question is about sea water and the substances found in sea water. (a) Table 2.1 shows the masses of the compounds present when a 2000 cm3 sample of sea water is evaporated. Table 2.1 compound formula mass of compound …
- Question 3
This question is about organic chemistry. (a) Petroleum is a mixture of hydrocarbons and is separated by fractional distillation in an industrial process. (i) State which physical property of hydrocarbons allows them to be separated by fractional distillation. (ii) Describe …
- Question 4
This question is about nitrogen and its compounds. (a) (i) Explain why nitrogen is in Group V of the Periodic Table. (ii) Two isotopes of nitrogen are shown in Fig. …
- Question 5
This question is about ionic compounds and simple molecular compounds. (a) Complete the word equation to show the reaction between copper(II) carbonate and nitric acid. copper(II) carbonate + nitric acid …
- Question 6
This question is about chemical reactions and their energy changes. (a) Tick (✓) one box that shows a chemical change. boiling ethanol decomposing vegetation dissolving salt mixing ink and water (b) Table 6.1 shows the results of four experiments. Table …
- Question 7
This question is about air and water. (a) Water needs to be treated to make it safe to drink. Complete Fig. 7.1 to show the three stages needed in the treatment of domestic water. The second stage has been completed. …
- Question 8
This question is about metals. …
Other Chemistry papers from May/June 2025
- 0620/11 Multiple choice (Core)
- 0620/12 Multiple choice (Core)
- 0620/13 Multiple choice (Core)
- 0620/21 Multiple choice (Extended)
- 0620/22 Multiple choice (Extended)
- 0620/23 Multiple choice (Extended)
- 0620/31 Theory (Core)
- 0620/32 Theory (Core)
- 0620/41 Theory (Extended)
- 0620/42 Theory (Extended)
- 0620/43 Theory (Extended)
- 0620/61 Alternative to Practical
- 0620/62 Alternative to Practical
- 0620/63 Alternative to Practical