Cambridge O Level · 5070 · Paper 2 · Theory
Chemistry 5070/21 May/June 2023 past paper
Cambridge O Level Chemistry (5070) Paper 2 (Theory), variant 1, May/June 2023: the question paper and its official mark scheme, 10 questions worth 80 marks, with the grade thresholds. Free to open, no account needed.
- Questions
- 10
- Marks
- 80
- Grade A from
- 52
File names: 5070_s23_qp_21 · 5070_s23_ms_21
Grade thresholds for 5070/21 May/June 2023
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 |
|---|---|---|---|---|
| 52 | 37 | 22 | 18 | 14 |
Topics in this paper
Which syllabus chapters 5070/21 May/June 2023 tested, by marks. Each chapter links to every past-paper question on it.
| Chapter | Questions | Marks |
|---|---|---|
| Chemical reactions | 2 | 18 |
| Organic chemistry | 2 | 17 |
| Acids, bases and salts | 2 | 14 |
| Atoms, elements and compounds | 1 | 9 |
| Chemical energetics | 1 | 8 |
| Chemistry of the environment | 1 | 8 |
| Electrochemistry | 1 | 6 |
Questions in 5070/21 May/June 2023
- Question 1
Choose from the following oxides to answer the questions. Al2O3 CO CO2 CaO Fe2O3 H2O Na2O SO2 SiO2 Each oxide may be used once, more than once or not at all. State which oxide: (a) is a solid made during …
- Question 2
Group I includes the elements lithium, sodium and potassium. (a) State two physical properties of lithium. …
- Question 3
This question is about the preparation of salts. (a) Zinc chloride is a soluble salt. It is prepared by the reaction of an insoluble base with a dilute acid. The equation for this reaction is shown. ZnO(s) + 2HCl (aq) …
- Question 4
This question is about compounds that contain phosphorus. (a) The formula for a phosphide ion can be written as 31 15P3–. Complete Table 4.1 to show the number of particles in this phosphide ion. Table 4.1 particle number of particles …
- Question 5
Ammonium chloride decomposes when heated to make hydrogen chloride and ammonia. This reaction is reversible. The forward reaction absorbs thermal energy. NH4Cl (s) HCl (g) + NH3(g) (a) An equilibrium mixture is formed when the reversible reaction happens in a …
- Question 6
This question is about the energy changes that take place during chemical reactions. (a) Methane reacts with chlorine to make chloromethane. The reaction is exothermic. CH4(g) + Cl2(g) CH3Cl (g) + HCl (g) Draw, on the axes provided in Fig. …
- Question 7
Methanol, propan-1-ol and propan-2-ol are alcohols. The displayed formulae of methanol and propan-1-ol are shown in Fig. 7.1. methanol H propan-1-ol …
- Question 8
This question is about electrolysis. (a) The table shows some information about the electrolysis of three different electrolytes using graphite electrodes. Complete Table 8.1 with the names of the products at each electrode. Table 8.1 electrolyte product at anode product …
- Question 9
Oxides of nitrogen such as nitrogen monoxide, NO, are atmospheric pollutants. The exhaust gas from a car engine contains 0.00200% by volume of nitrogen monoxide. (a) Calculate the number of molecules of nitrogen monoxide in 960 dm3 of exhaust gas …
- Question 10
PVC and poly(propene) are polymers made by a reaction called addition polymerisation. (a) The diagram in Fig. 10.1 shows the structure of PVC. …
Other Chemistry papers from May/June 2023
- 5070/11 Multiple choice
- 5070/12 Multiple choice
- 5070/22 Theory
- 5070/41 Alternative to Practical
- 5070/42 Alternative to Practical