Cambridge IGCSE · 0620 · Paper 4 · Theory (Extended)
Chemistry 0620/43 May/June 2021 past paper
Cambridge IGCSE Chemistry (0620) Paper 4 (Theory (Extended)), variant 3, May/June 2021: the question paper and its official mark scheme, 7 questions worth 80 marks, with the grade thresholds. Free to open, no account needed.
- Questions
- 7
- Marks
- 80
- Grade A from
- 40
File names: 0620_s21_qp_43 · 0620_s21_ms_43
Grade thresholds for 0620/43 May/June 2021
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 |
|---|---|---|---|---|---|---|
| 40 | 30 | 20 | 16 | 12 | 9 | 6 |
Topics in this paper
Which syllabus chapters 0620/43 May/June 2021 tested, by marks. Each chapter links to every past-paper question on it.
| Chapter | Questions | Marks |
|---|---|---|
| Electrochemistry | 2 | 25 |
| Acids, bases and salts | 1 | 15 |
| Stoichiometry | 1 | 15 |
| Metals | 1 | 13 |
| Chemical reactions | 1 | 7 |
| Atoms, elements and compounds | 1 | 5 |
Questions in 0620/43 May/June 2021
- Question 1
Give the name of the process that is used: (a) to produce large molecules from monomers (b) to separate oxygen from liquid air (c) to make ethanol from glucose (d) to separate water from aqueous sodium chloride (e) to produce …
- Question 2
Complete the table to: ● deduce the number of protons, electrons and neutrons in the boron atom and chloride ion shown ● identify the atom or ion represented by the final row. formula number of protons number of electrons number …
- Question 3
Sodium reacts with fluorine to form sodium fluoride, NaF. (a) Write a chemical equation for this reaction. (b) Sodium fluoride is an ionic compound. Complete the diagram to show the electron arrangement in the outer shells of the ions present …
- Question 4
Hydrogen iodide, HI, decomposes into iodine and hydrogen. The reaction is reversible. 2HI(g) …
- Question 5
This question is about salts. (a) Salts that are soluble in water can be made by the reaction between insoluble carbonates and dilute acids. Zinc sulfate is soluble in water. You are provided with solid zinc carbonate, ZnCO3, and dilute …
- Question 6
This question is about metals. (a) Iron is extracted from its main ore in a blast furnace. waste gases slag air air A (i) Coke and iron ore are added at the top of the blast furnace. Name one other …
- Question 7
Many organic compounds contain carbon, hydrogen and oxygen only. (a) An organic compound R has the following composition by mass. …
Other Chemistry papers from May/June 2021
- 0620/11 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)
- 0620/33 Theory (Core)
- 0620/41 Theory (Extended)
- 0620/42 Theory (Extended)
- 0620/61 Alternative to Practical
- 0620/62 Alternative to Practical
- 0620/63 Alternative to Practical