Cambridge O Level · 5070 · Paper 2 · Theory
Chemistry 5070/21 Oct/Nov 2016 past paper
Cambridge O Level Chemistry (5070) Paper 2 (Theory), variant 1, Oct/Nov 2016: 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
- 47
File names: 5070_w16_qp_21 · 5070_w16_ms_21
Grade thresholds for 5070/21 Oct/Nov 2016
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 |
|---|---|---|---|---|
| 47 | 35 | 23 | 18 | 13 |
Topics in this paper
Which syllabus chapters 5070/21 Oct/Nov 2016 tested, by marks. Each chapter links to every past-paper question on it.
| Chapter | Questions | Marks |
|---|---|---|
| Stoichiometry | 3 | 30 |
| Acids, bases and salts | 2 | 15 |
| Organic chemistry | 1 | 11 |
| Chemical energetics | 1 | 10 |
| Chemical reactions | 1 | 8 |
| Chemistry of the environment | 1 | 6 |
| Electrochemistry | 1 | 5 |
Questions in 5070/21 Oct/Nov 2016
- Question 1
A1 Choose from the following compounds to answer the questions below. Ba(NO3)2 CaCO3 CaO CH4 C3H8 Fe2O3 KMnO4 NaNO3 NO SO2 V2O5 Zn(NO3)2 Each of these compounds can be used once, more than once or not at all. Which compound …
- Question 2
A2 Sulfuric acid is a strong acid. (a) (i) What is meant by the term strong acid ? (ii) Describe how you could measure the pH of dilute sulfuric acid. (b) Many plants cannot grow in soils which are too …
- Question 3
A3 The alcohols are a homologous series with the general formula CnH2n+1OH. (a) Deduce the molecular formula of the alcohol having eight carbon atoms. (b) The table shows some information about different alcohols. alcohol formula melting point / °C boiling …
- Question 4
A4 Peroxodisulfate ions, S2O8 2–, react with iodide ions in aqueous solution. S2O8 2–(aq) + 2I–(aq) 2SO4 2–(aq) + I2(aq) The table shows how the relative rate of this reaction changes when different concentrations of peroxodisulfate ions and iodide ions …
- Question 5
A5 Potassium chlorate, KCl O3, decomposes to form potassium chloride and oxygen. 2KCl O3(s) 2KCl …
- Question 6
A6 Dry air contains nitrogen, oxygen, argon and other gases. (a) State the percentage compositions by volume of nitrogen and oxygen present in dry air. nitrogen % oxygen % (b) The formula for oxygen gas is O2. (i) Draw a …
- Question 7
B7 Ethenyl ethanoate, CH3CO2CH=CH2, is manufactured by passing a mixture of ethanoic acid, ethene and oxygen over a catalyst at 200 °C. CH3CO2H + CH2=CH2 + ½O2 CH3CO2CH=CH2 + H2O The reaction is exothermic. (a) Draw an energy profile diagram …
- Question 8
B8 Ethanol can be manufactured by reacting ethene with steam in a closed reaction vessel. …
- Question 9
B9 Tin and silver are metals. (a) State two properties which are characteristic of most metals. (b) Draw a labelled diagram to show how a tin rod can be electroplated with silver. …
- Question 10
B10 A student prepared some crystals of hydrated lithium nitrate by reacting aqueous lithium hydroxide with dilute nitric acid. LiOH + HNO3 + 2H2O LiNO3.3H2O (a) Explain how you would carry out this procedure to obtain pure dry crystals of …
Other Chemistry papers from Oct/Nov 2016
- 5070/11 Multiple choice
- 5070/12 Multiple choice
- 5070/22 Theory
- 5070/41 Alternative to Practical
- 5070/42 Alternative to Practical