Cambridge O Level · 5070 · Paper 1 · Multiple choice
Chemistry 5070/12 Oct/Nov 2020 past paper
Cambridge O Level Chemistry (5070) Paper 1 (Multiple choice), variant 2, Oct/Nov 2020: the question paper and its official mark scheme, 40 questions worth 40 marks, with the grade thresholds. Free to open, no account needed.
- Questions
- 40
- Marks
- 40
- Grade A from
- 26
File names: 5070_w20_qp_12 · 5070_w20_ms_12
Grade thresholds for 5070/12 Oct/Nov 2020
The minimum raw marks Cambridge set for each grade on this component (out of 40). Thresholds change every session and variant, so always compare your score with the paper you actually sat.
| A | B | C | D | E |
|---|---|---|---|---|
| 26 | 20 | 15 | 13 | 11 |
Topics in this paper
Which syllabus chapters 5070/12 Oct/Nov 2020 tested, by marks. Each chapter links to every past-paper question on it.
Questions in 5070/12 Oct/Nov 2020
- Question 1
During a titration experiment, an acid is transferred into a burette. The diagrams show part of the burette at the start of the titration and at the end-point. …
- Question 2
When calcium carbonate is added to dilute hydrochloric acid, carbon dioxide gas is released. Three sets of apparatus are shown. CaCO3(s) + HCl (aq) gas syringe CaCO3(s) + HCl (aq) water measuring cylinder thistle funnel mass balance tap funnel …
- Question 3
Chromatography can be used to separate and identify dyes present in a mixture. Which statement is correct? A A dye with an Rf value of 1.2 can be present in a mixture. B A dye could have a different Rf …
- Question 4
Petroleum (crude oil) is separated into useful fractions by fractional distillation. The positions at which fractions X and Y are collected from the fractionating column are shown. petroleum fractions X Y Which statement is correct? A The temperature increases up …
- Question 5
Aqueous zinc chloride is tested with various reagents. Which observation is correct? A Aqueous ammonia gives a white precipitate which is soluble in excess reagent. B Copper turnings give a precipitate of zinc. C Acidified aqueous silver nitrate gives a …
- Question 6
When aqueous sodium hydroxide is added to a solution, a white precipitate forms which dissolves when excess sodium hydroxide is added. Which ion could be present in the solution? A Al 3+(aq) B Ca2+(aq) C Cu2+(aq) D Na+(aq)
- Question 7
A sample of a gas occupies a volume of 2.0 dm3 at room temperature and pressure. Which changes in the conditions would both decrease the volume occupied by the gas? temperature pressure A decreased decreased B increased decreased C decreased …
- Question 8
An ion contains 20 electrons and has a charge of +3. From which element was the ion formed? A aluminium B calcium C iron D vanadium
- Question 9
Which statement is correct? A Diamond conducts electricity while graphite does not. B Graphite has delocalised ions between its layers. C In diamond, each carbon atom is joined to three other carbon atoms only. D The layered structure of graphite …
- Question 10
Which material has the highest melting point? A ammonia B methane C sodium chloride D water
- Question 11
Which statement describes ionic bonds? A a lattice of ions in a ‘sea of electrons’ B electrostatic attraction between oppositely charged ions C the sharing of electrons between atoms to gain a noble gas configuration D the transfer of electrons …
- Question 12
Which substances contain at least one double bond? …
- Question 13
Magnesium will react with aqueous copper(II) sulfate to form copper and aqueous magnesium sulfate. What is the correct equation for this reaction? A Mg + CuSO4 Cu + MgSO4 B Mg + Cu2SO4 2Cu + MgSO4 C 2Mg …
- Question 14
A sample of magnesium hydroxide has a mass of 4.63 g. How many moles of magnesium hydroxide are present? …
- Question 15
Which statement is correct? A The concentration of a solution is expressed in dm3 / mol. B The empirical formula of a compound always gives the actual numbers of each type of atom in one molecule. C The molecular formula …
- Question 16
Which sample contains the most atoms? A 0.5 mol of water B 1.0 mol of carbon dioxide C 1.0 mol of methane D 2.0 mol of hydrogen chloride
- Question 17
The equation shows the production of iron by the reduction of iron(III) oxide. Fe2O3 + 3CO 2Fe + 3CO2 80 tonnes of iron(III) oxide produces 50 tonnes of iron. What is the percentage yield? …
- Question 18
Aqueous copper(II) sulfate is electrolysed using copper electrodes. The current is constant and the anode is weighed at regular time intervals. Which graph is obtained when the mass of the anode is plotted against time? mass of anode time A …
- Question 19
The diagram shows the electrolysis of a mixture of aqueous copper(II) nitrate, Cu(NO3)2(aq), and aqueous silver nitrate, AgNO3(aq). Electrodes X and Y are inert. + – mixture of AgNO3(aq) and Cu(NO3)2(aq) Y X Copper is above silver in the reactivity …
- Question 20
The energy profile diagram of a chemical reaction is shown. …
- Question 21
Which statement describes the conversion of magnesium atoms to magnesium ions? A The change is reduction because there has been a gain of electrons. B The change is oxidation because there has been a loss of electrons. C The change …
- Question 22
When water is liquid, it ionises slightly. H2O(l) H+(aq) + OH–(aq) The forward reaction is endothermic. When the temperature of water is increased, which changes take place? 1 The water becomes acidic. 2 The water becomes alkaline. 3 More water …
- Question 23
Which salts could be prepared by precipitation? 1 barium sulfate 2 lead chloride 3 copper(II) chloride 4 zinc sulfate A 1 and …
- Question 24
Silver is below hydrogen in the reactivity series. Which row describes the chemicals used and the method of separation used to prepare a pure sample of silver chloride? chemicals used method of separation of product A silver and hydrochloric acid …
- Question 25
Ammonia is manufactured by the Haber process. …
- Question 26
The table contains some facts about sulfur dioxide and sulfuric acid and comments on these facts. Which row is correct? fact comment A In the manufacture of sulfuric acid, sulfur reacts with oxygen to make sulfur trioxide. The equation for …
- Question 27
An atom of which element has the same electronic configuration as an atom of an ion of strontium? A calcium B krypton C rubidium D selenium
- Question 28
Metals have high melting points. What is the reason for this? A Their atoms are joined by strong covalent bonds in a giant lattice. B They have strong forces of attraction between negative ions and delocalised electrons. C They have …
- Question 29
What happens when a strip of silver is immersed in aqueous copper(II) sulfate? A Bubbles of gas will appear. B No reaction occurs. C Pink copper will be deposited on the silver strip. D The silver strip will start to …
- Question 30
Four metals and hydrogen are arranged in order of decreasing reactivity. potassium decreasing reactivity aluminium zinc hydrogen copper Which statement about these elements is correct? A Aluminium is formed when aluminium oxide is heated with hydrogen. B Copper displaces zinc …
- Question 31
Aluminium is extracted from its ore using electrolysis. Which statement about the electrodes used is correct? A The anode is made of graphite. B The anode is made of steel. C The cathode is made of bauxite. D The cathode …
- Question 32
Gas X is present in dry air and may contribute to global warming. What is X? A carbon monoxide B methane C nitrogen oxide D sulfur dioxide
- Question 33
Four processes are used during the purification of water. ● use of carbon ● desalination ● chlorination ● filtration The purposes, …
- Question 34
Propane undergoes substitution reactions when mixed with chlorine gas in the presence of ultraviolet light. Which compound could be formed when propane and chlorine are mixed in the presence of ultraviolet light? A CH3CCl 2CH3 B CH2Cl CH2Cl C CH3CH2CH3Cl …
- Question 35
The hydrocarbon CH3CHCH2 will undergo a number of chemical reactions. In which reaction will the carbon to carbon single bond be broken? A combustion with oxygen B hydrogenation C polymerisation D reaction with steam
- Question 36
Hydrocarbon compounds can form rings of carbon atoms as well as chains. The structures of two hydrocarbon rings are shown. …
- Question 37
A sample of aqueous glucose is fermented with yeast at 37 C in the absence of air. The main organic product, X, is purified by fractional distillation. X is then oxidised, by heating under reflux with acidified potassium manganate(VII), to …
- Question 38
The diagram shows the structure of a compound called ethanoic anhydride. …
- Question 39
Burning polymers can cause atmospheric pollution. Which polymer, on burning, could produce nitrogen oxides? A nylon B poly(ethene) C starch D Terylene
- Question 40
The diagram shows the repeat unit of a polymer. …
Other Chemistry papers from Oct/Nov 2020
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