Cambridge O Level · 5070 · Paper 1 · Multiple choice
Chemistry 5070/12 May/June 2021 past paper
Cambridge O Level Chemistry (5070) Paper 1 (Multiple choice), variant 2, May/June 2021: 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
- 23
File names: 5070_s21_qp_12 · 5070_s21_ms_12
Grade thresholds for 5070/12 May/June 2021
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 |
|---|---|---|---|---|
| 23 | 19 | 15 | 13 | 11 |
Topics in this paper
Which syllabus chapters 5070/12 May/June 2021 tested, by marks. Each chapter links to every past-paper question on it.
Questions in 5070/12 May/June 2021
- Question 1
The formula of magnesium oxide can be investigated by using the fact that when magnesium is heated it reacts with oxygen to form magnesium oxide. Which apparatus is used for this investigation? gas syringe balance crucible …
- Question 2
Which property of a liquid ester can be used to check its purity before use as a food flavouring? A boiling point B colour C smell D solubility in water
- Question 3
Which separation method would give pure samples of both substances from the mixture? mixture separation method A copper sulfate crystals and water crystallisation B ethanol and water evaporation C salt and sand filtration D nitrogen and oxygen fractional distillation
- Question 4
An aqueous solution of J is a colourless solution that contains cations and chloride ions. Separate samples of the solution give a white precipitate with a few drops of aqueous sodium hydroxide and with a few drops of aqueous ammonia. …
- Question 5
Gas X has the following properties. 1 colourless 2 no effect on either damp red or blue litmus papers 3 no effect on limewater 4 flammable What is gas X? A ammonia B chlorine C hydrogen D oxygen
- Question 6
Which statement about states of matter is correct? A When a liquid freezes it becomes a solid and energy is released to the surroundings. B When a liquid reaches its boiling point it becomes a gas. This process is called …
- Question 7
Use the Periodic Table to answer this question. Which two particles have the same number of electrons? A Ar and Ca B Na+ and K+ C Fe2+ and Fe3+ D Ca2+ and Sc3+
- Question 8
The table shows data for particles …
- Question 9
Which dot-and-cross diagram correctly shows a molecule of ethene? …
- Question 10
The names and formulae of three nitrogen compounds are shown. ammonia hydrazine hydroxylamine NH3 N2H4 NH2OH Which compound has the highest relative molecular mass, Mr, and in which compound is the percentage by mass of hydrogen the greatest? highest Mr …
- Question 11
The relative formula masses of four compounds are given. A student has …
- Question 12
10 cm3 of propane is burned in 70 cm3 of oxygen in a closed container. …
- Question 13
When a mixture of sodium chloride and sodium hydrogencarbonate is heated, the reaction shown takes place. 2NaHCO3(s) Na2CO3(s) + CO2(g) + H2O(g) Sodium chloride is unchanged on heating. When 6.0 g of the mixture is heated, the loss in …
- Question 14
Molten sodium chloride is electrolysed. Which change occurs at the cathode? A Sodium ions are oxidised. B Sodium ions are reduced. C Chloride ions are oxidised. D Chloride ions are reduced.
- Question 15
Which positive ions are present in aqueous copper(II) sulfate? A copper(II) ions only B copper(II) ions and hydrogen ions C sulfate ions only D sulfate ions and hydroxide ions
- Question 16
Natural gas is used as a source of energy. What is the main compound in natural gas? A ethane B ethene C methane D methanol
- Question 17
Ethanol is produced by the fermentation of glucose from sugar cane. In some countries ethanol is used as a fuel. Which statements are correct? 1 Sugar cane is a non-renewable (finite) resource. 2 When sugar cane is growing it removes …
- Question 18
Aqueous sodium thiosulfate reacts with hydrochloric acid. The rate of the reaction increases if the concentration of both reactants is increased. Nitrogen gas reacts with hydrogen gas. The rate of the reaction increases if the pressure in the reaction vessel …
- Question 19
Magnesium reacts with dilute sulfuric acid. Mg(s) + H2SO4(aq) MgSO4(aq) + H2(g) Two experiments are carried out at 25 C. experiment …
- Question 20
Solution X is colourless. A few drops of aqueous potassium iodide solution are added to a sample of X. No change is seen. Solution Y is colourless. A few drops of aqueous acidified potassium manganate(VII) solution are added to a …
- Question 21
Brown nitrogen dioxide reacts to form colourless dinitrogen tetroxide in a reversible reaction. The forward reaction is exothermic. 2NO2(g) N2O4(g) brown colourless Which changes would make the equilibrium mixture darker in colour? temperature pressure A decrease decrease B decrease increase …
- Question 22
Which row shows the pH values for 0.1 mol / dm3 solutions of ammonia, hydrochloric acid, sodium chloride and sodium hydroxide? pH values NH3 HCl NaCl NaOH …
- Question 23
Four test-tubes are set up as shown. AgNO3(aq) W Cu(NO3)2(aq) X Pb(NO3)2(aq) Y NaNO3(aq) Z What is the effect of adding dilute hydrochloric acid to each test-tube? …
- Question 24
Aqueous ammonia reacts with a compound to form a salt, ammonium phosphate. What type of reaction will ammonia undergo to form ammonium phosphate? A combustion B neutralisation C oxidation D precipitation
- Question 25
Sulfuric acid is manufactured in the contact process. Several substances are involved in this process, including vanadium(V) oxide and water. Which roles are played by vanadium(V) oxide and water in the contact process? vanadium(V) oxide water A catalyst reactant B …
- Question 26
Some properties which indicate the differences in elements are listed. 1 metallic character 2 number of electron shells in an atom 3 number of protons in an atom 4 total number of electrons in an atom Which two properties increase …
- Question 27
Germanium is in Group IV of the Periodic Table. It has a proton number of 32. Selenium is in Group VI of the Periodic Table. It has a proton number of 34. Which prediction can be made, based on the …
- Question 28
The proton number of caesium is 55. Compared with lithium, the melting point of caesium is 1 and the reaction of caesium with water is 2 vigorous. The number of valence electrons in caesium is 3 compared to lithium. Which …
- Question 29
Nickel is a transition element. Which properties does it have? 1 It can act as a catalyst. 2 It conducts electricity when molten. 3 It forms coloured compounds. 4 It has only one oxidation state in its compounds. …
- Question 30
Which metal reacts with steam and can be extracted from its ore by reduction with carbon? A magnesium B calcium C copper D zinc
- Question 31
Three correct statements about aluminium are listed. 1 Aluminium is the most common metal in the Earth’s crust. 2 It is costly to extract aluminium from its ore, bauxite. 3 The world’s supply of bauxite is limited. Which statements explain …
- Question 32
Attaching pieces of magnesium to underground iron pipes can protect the iron from corrosion. Which reaction protects the iron from corrosion? A Fe2+(aq) …
- Question 33
Iron is extracted from its ore, haematite, in a blast furnace. Which statement about this extraction process is correct? A Air is blown into the blast furnace to react with carbon. B At the bottom of a blast furnace a …
- Question 34
Which statement about the preparation and properties of aluminium is correct? A Aluminium is obtained by heating aluminium oxide with carbon. B Aluminium is produced at the anode by electrolysis of aluminium oxide dissolved in molten cryolite. C Aluminium is …
- Question 35
How many moles of hydrogen chloride are formed when one mole of methane reacts with a large excess of chlorine in sunlight? …
- Question 36
Vegetable oils can be made into margarine. Which row describes the changes which take place? hydrogen viscosity A is added increases B is removed decreases C is added decreases D is removed increases
- Question 37
Which statements about alcohols are correct? 1 All alcohols contain the hydroxide ion, OH–. 2 Ethanol can be formed from ethene using a reaction catalysed by yeast. 3 Methanol can be oxidised to methanoic acid. 4 The alcohols X and …
- Question 38
Which circled structure shows only the functional group of a carboxylic acid? …
- Question 39
Which statement about polymers is correct? A Nylon and Terylene are both polyesters. B Proteins and nylon have the same monomer units. C Proteins have the same amide linkages as nylon. D Terylene and fats are esters but with different …
- Question 40
Some information about compound X is given. X contains the elements carbon, hydrogen and oxygen only. The product of the hydrolysis of X is the simple sugar, glucose. What is …
Other Chemistry papers from May/June 2021
- 5070/11 Multiple choice
- 5070/21 Theory
- 5070/22 Theory
- 5070/41 Alternative to Practical
- 5070/42 Alternative to Practical