Cambridge O Level · 5070 · Paper 2 · Theory
Chemistry 5070/21 Oct/Nov 2021 past paper
Cambridge O Level Chemistry (5070) Paper 2 (Theory), variant 1, Oct/Nov 2021: the question paper and its official mark scheme, 10 questions worth 85 marks, with the grade thresholds. Free to open, no account needed.
- Questions
- 10
- Marks
- 75
- Grade A from
- 42
File names: 5070_w21_qp_21 · 5070_w21_ms_21
Grade thresholds for 5070/21 Oct/Nov 2021
The minimum raw marks Cambridge set for each grade on this component (out of 75). Thresholds change every session and variant, so always compare your score with the paper you actually sat.
| A | B | C | D | E |
|---|---|---|---|---|
| 42 | 31 | 20 | 17 | 14 |
Topics in this paper
Which syllabus chapters 5070/21 Oct/Nov 2021 tested, by marks. Each chapter links to every past-paper question on it.
| Chapter | Questions | Marks |
|---|---|---|
| Chemistry of the environment | 2 | 20 |
| Acids, bases and salts | 2 | 15 |
| Chemical energetics | 2 | 12 |
| Chemical reactions | 1 | 11 |
| Atoms, elements and compounds | 1 | 10 |
| States of matter | 1 | 10 |
| Organic chemistry | 1 | 7 |
Questions in 5070/21 Oct/Nov 2021
- Question 1
Choose from the following oxides to answer the questions. aluminium oxide calcium oxide iron(II) oxide magnesium oxide silicon dioxide sodium oxide sulfur dioxide Each oxide may be used once, more than once or not at all. State which oxide: (a) …
- Question 2
Dry air contains nitrogen, oxygen, noble gases and carbon dioxide. (a) State the percentage of oxygen present in dry air. (b) Carbon dioxide is removed from a sample of air by passing the air through aqueous sodium hydroxide. Explain why …
- Question 3
Iron powder reacts with dilute sulfuric acid. Fe(s) + H2SO4(aq) FeSO4(aq) …
- Question 4
Alkenes are a homologous series of hydrocarbons. (a) Alkenes are produced by cracking. State the meaning of the term cracking. (b) Margarine is manufactured from vegetable oils using a nickel catalyst. (i) Name the other reactant used in this reaction. …
- Question 5
Magnesium undergoes oxidation when it reacts with aqueous silver nitrate. Mg + 2Ag+ Mg2+ + 2Ag (a) Explain how this equation shows that magnesium is oxidised. (b) The reaction of magnesium with silver nitrate is exothermic. Complete the energy profile …
- Question 6
Chlorine reacts with phosphorus to form phosphorus(III) chloride. 3Cl2 + 2P 2PCl3 The reaction is exothermic. (a) Explain in terms of bond breaking and bond forming why the reaction is exothermic. (b) (i) When chlorine reacts with aqueous potassium iodide …
- Question 7
This question is about metals and metal compounds. (a) Silver is a transition element. Potassium is a metal in Group I of the Periodic Table. State two differences in the physical properties of silver and potassium. …
- Question 8
The structure of angelic acid is shown. H CH3 …
- Question 9
This question is about ammonia and nitrates. (a) State the source of the hydrogen and nitrogen used in the manufacture of ammonia by the Haber process. source of hydrogen source of nitrogen (b) Ammonia is formed when aqueous ammonium sulfate …
- Question 10
This question is about elements in Group IV of the Periodic Table. (a) The table shows some properties of the Group IV elements. element density at room temperature in g / cm3 melting point in °C boiling point in °C …
Other Chemistry papers from Oct/Nov 2021
- 5070/11 Multiple choice
- 5070/12 Multiple choice
- 5070/22 Theory
- 5070/41 Alternative to Practical
- 5070/42 Alternative to Practical