Cambridge IGCSE · 0620 · Paper 3 · Theory (Extended)
Chemistry 0620/31 Oct/Nov 2015 past paper
Cambridge IGCSE Chemistry (0620) Paper 3 (Theory (Extended)), variant 1, Oct/Nov 2015: 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
- 44
File names: 0620_w15_qp_31 · 0620_w15_ms_31
Grade thresholds for 0620/31 Oct/Nov 2015
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 |
|---|---|---|---|---|---|---|
| 44 | 32 | 21 | 19 | 16 | 11 | 6 |
Topics in this paper
Which syllabus chapters 0620/31 Oct/Nov 2015 tested, by marks. Each chapter links to every past-paper question on it.
| Chapter | Questions | Marks |
|---|---|---|
| Acids, bases and salts | 2 | 20 |
| Stoichiometry | 2 | 20 |
| Chemical reactions | 1 | 15 |
| Atoms, elements and compounds | 1 | 13 |
| Organic chemistry | 1 | 12 |
Questions in 0620/31 Oct/Nov 2015
- Question 1
(a) The symbols of six particles are shown below. Na+ Ca2+ Kr P Si O2– Select from the list of particles to answer the following questions. A particle may be selected once, more than once or not at all. (i) …
- Question 2
Describe how to separate the following. In each example, give a description of the procedure used and explain why this method works. (a) Copper powder from a mixture containing copper and zinc powders. procedure explanation (b) Nitrogen from a mixture …
- Question 3
Sulfuric acid is made by the Contact process. (a) Sulfur is burned by spraying droplets of molten sulfur into air. Suggest and explain an advantage of using this method. (b) The following equation represents the equilibrium in the Contact process. …
- Question 4
(a) Synthetic polymers are disposed of in landfill sites and by burning. (i) Describe two problems caused by the disposal of synthetic polymers in landfill sites. (ii) Describe one problem caused by burning synthetic polymers. (b) State two uses of …
- Question 5
(a) A compound, X, contains 55.85% carbon, 6.97% hydrogen and 37.18% oxygen. (i) How does this prove that compound X contains only carbon, hydrogen and oxygen? (ii) Use the above percentages to calculate the empirical formula of compound X. (iii) …
- Question 6
Carbon and silicon are elements in Group IV. They both form oxides of the type XO2. (a) Silicon(IV) oxide, SiO2, has a macromolecular structure. (i) Describe the structure of silicon(IV) oxide. (ii) State three properties which silicon(IV) oxide and diamond …
- Question 7
The rate of a photochemical reaction is affected by light. (a) The decomposition of silver bromide is the basis of film photography. This is a redox reaction. 2AgBr → 2Ag + Br2 cream black step 1 2Br – → Br2 …
Other Chemistry papers from Oct/Nov 2015
- 0620/11 Multiple choice (Core)
- 0620/12 Multiple choice (Core)
- 0620/13 Multiple choice (Core)
- 0620/21 Theory (Core)
- 0620/22 Theory (Core)
- 0620/23 Theory (Core)
- 0620/32 Theory (Extended)
- 0620/33 Theory (Extended)
- 0620/61 Alternative to Practical
- 0620/62 Alternative to Practical
- 0620/63 Alternative to Practical