Cambridge IGCSE · 0620 · Paper 4 · Theory (Extended)
Chemistry 0620/42 May/June 2021 past paper
Cambridge IGCSE Chemistry (0620) Paper 4 (Theory (Extended)), variant 2, May/June 2021: 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
- 40
File names: 0620_s21_qp_42 · 0620_s21_ms_42
Grade thresholds for 0620/42 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 | 19 | 15 | 11 | 8 | 5 |
Topics in this paper
Which syllabus chapters 0620/42 May/June 2021 tested, by marks. Each chapter links to every past-paper question on it.
| Chapter | Questions | Marks |
|---|---|---|
| Chemistry of the environment | 2 | 27 |
| Stoichiometry | 1 | 19 |
| Electrochemistry | 1 | 12 |
| Organic chemistry | 1 | 12 |
| Acids, bases and salts | 1 | 10 |
Questions in 0620/42 May/June 2021
- Question 1
The symbols of the elements of Period 3 of the Periodic Table are shown. Na Mg Al Si P S Cl Ar Answer the following questions about these elements. Each element may be used once, more than once or not …
- Question 2
Silver has an atomic number of 47. (a) Naturally occurring atoms of silver are 107Ag and 109Ag. (i) State the name given to atoms of the same element with different nucleon numbers. (ii) Complete the table to show the number …
- Question 3
Sodium hydrogencarbonate is found in baking powder. When sodium hydrogencarbonate is heated it forms three products. 2NaHCO3 → Na2CO3 …
- Question 4
A student carries out an electrolysis experiment using the apparatus shown. + – carbon electrodes wire dilute aqueous sodium chloride The student uses dilute aqueous sodium chloride. (a) State the name given to any solution which undergoes electrolysis. (b) Hydroxide …
- Question 5
This question is about compounds of nitrogen. (a) Nitrogen reacts with lithium to form lithium nitride, Li3N. (i) Write the chemical equation for the reaction between lithium and nitrogen. (ii) Lithium nitride is ionically bonded. Complete the diagram to show …
- Question 6
Molecules A and B can form condensation polymers. A HO OH B HOOC COOH (a) Each molecule has two identical functional groups. (i) Name the functional group in B. (ii) Draw the part of the structure of the synthetic polymer …
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)
- 0620/43 Theory (Extended)
- 0620/61 Alternative to Practical
- 0620/62 Alternative to Practical
- 0620/63 Alternative to Practical