Cambridge IGCSE · 0620 · Paper 4 · Theory (Extended)
Chemistry 0620/43 Oct/Nov 2021 past paper
Cambridge IGCSE Chemistry (0620) Paper 4 (Theory (Extended)), variant 3, Oct/Nov 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
- 45
File names: 0620_w21_qp_43 · 0620_w21_ms_43
Grade thresholds for 0620/43 Oct/Nov 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 |
|---|---|---|---|---|---|---|
| 45 | 35 | 25 | 21 | 17 | 13 | 9 |
Topics in this paper
Which syllabus chapters 0620/43 Oct/Nov 2021 tested, by marks. Each chapter links to every past-paper question on it.
| Chapter | Questions | Marks |
|---|---|---|
| Chemistry of the environment | 2 | 25 |
| Organic chemistry | 1 | 16 |
| Electrochemistry | 1 | 12 |
| Acids, bases and salts | 1 | 11 |
| Chemical reactions | 1 | 10 |
| Atoms, elements and compounds | 1 | 6 |
Questions in 0620/43 Oct/Nov 2021
- Question 1
A list of substances is shown. ammonia bauxite carbon dioxide carbon monoxide ethanol hematite oxygen sodium chloride sulfur dioxide Answer the questions using the list of substances. Each substance may be used once, more than once or not at all. …
- Question 2
This question is about electrolysis. (a) State the meaning of the term electrolyte. (b) The table gives information about the electrolysis of two electrolytes. Carbon (graphite) electrodes are used in each experiment. (i) Complete the table to show the observations …
- Question 3
Lead is a metallic element in Group IV. One of the ores of lead is galena, which is an impure form of lead(II) sulfide, PbS. Lead also occurs in the ore cerussite, which contains lead(II) carbonate, PbCO3. (a) Calculate the …
- Question 4
Carbon is an important element. (a) Carbon exists as the isotopes 12C 6 and …
- Question 5
(a) Dilute sulfuric acid and aqueous sodium hydroxide can be used to prepare sodium sulfate crystals using a method that involves titration. 25.0 cm3 aqueous sodium hydroxide conical flask dilute sulfuric acid (i) Suggest why universal indicator is not suitable …
- Question 6
A student investigates the decomposition of hydrogen peroxide in the presence of a catalyst of manganese(IV) oxide. 2H2O2(aq) …
- Question 7
(a) Ethanol is a member of the homologous series of alcohols. Give two characteristics of members of a homologous series. …
Other Chemistry papers from Oct/Nov 2021
- 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)
- 0620/33 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