Cambridge O Level · 5070 · Paper 1 · Multiple choice
Chemistry 5070/11 May/June 2021 past paper
Cambridge O Level Chemistry (5070) Paper 1 (Multiple choice), variant 1, 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
- 24
File names: 5070_s21_qp_11 · 5070_s21_ms_11
Grade thresholds for 5070/11 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 |
|---|---|---|---|---|
| 24 | 21 | 16 | 14 | 12 |
Topics in this paper
Which syllabus chapters 5070/11 May/June 2021 tested, by marks. Each chapter links to every past-paper question on it.
Questions in 5070/11 May/June 2021
- Question 1
A student has to measure 28.2 cm3 of aqueous sodium bromide. Which piece of apparatus should the student select? …
- 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 sequence of procedures is used to separate a pure, dry sample of hydrated copper(II) sulfate, CuSO4•5H2O, from a mixture containing hydrated copper(II) sulfate and calcium carbonate, CaCO3? A dissolve in water distillation crystallisation B dissolve in water …
- Question 4
J is an aqueous solution. On addition of aqueous sodium hydroxide to J a green precipitate is formed. The resulting mixture is heated and no gas is formed. Aluminium foil is added to the warmed mixture. A gas is formed …
- 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 particle contains most electrons? …
- Question 7
The diagrams show the structures of two solids, P and …
- Question 8
What is a covalent bond? A a pair of electrons shared by two non-metallic atoms B electrons being shared by a lattice of positively charged ions C elements losing electrons to achieve a noble gas structure D oppositely charged particles …
- Question 9
The empirical formula of compound X is CH2 and the relative molecular mass, Mr, of X is 70. What is the molecular formula of X? A CH2 …
- Question 10
A chemist wants to make calcium nitrate. They start with 8.00 g of pure calcium oxide and an excess of dilute nitric acid. They produce 12.65 g of pure, dry anhydrous calcium nitrate crystals. What is the percentage yield of …
- Question 11
The relative formula masses of four compounds are given. A student has …
- Question 12
How many elements combine to form the compound ammonium sulfate? …
- Question 13
An aqueous mixture of copper(II) nitrate and silver nitrate is electrolysed with pure copper electrodes. Which half-equation correctly describes the change occurring at the anode? A Cu Cu2+ …
- Question 14
The diagram shows the electrolysis of concentrated and dilute aqueous sodium chloride using inert electrodes. Gases are produced and collected in each of the test-tubes …
- 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
These statements refer to hydrogen and its use as a fuel. 1 Both water and hydrocarbons can be used as a source of hydrogen. 2 In a fuel cell hydrogen reacts with oxygen to generate electricity. 3 The reaction taking …
- 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
Which changes will speed up a chemical reaction? 1 decreasing the pressure in a reaction between gases 2 increasing the size of the solid particles in a reaction involving solids 3 increasing the temperature of any reaction 4 increasing the …
- 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
In which equations is the change in the underlined species correct? 1 CH4 …
- Question 21
The Haber process converts nitrogen and hydrogen into ammonia. …
- 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
The water in a lake is acidic and the fish are dying. The water in the lake needs to be neutralised. Which compound can be added in excess to neutralise the water in the lake? A calcium carbonate B phosphoric …
- Question 24
Two incomplete statements about the preparation of an insoluble salt are given. 1 can be used to prepare insoluble salts, such as 2 . The salt is collected by 3 and it is then 4 . Which words correctly complete …
- Question 25
The Haber process is used to make ammonia at a temperature of 400 C and a pressure of 20 000 kPa. The temperature is changed to 500 C but the pressure is kept the same. What will be the effects …
- 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
Elements X and Y combine to form an ionic compound. Atoms of X have more protons than atoms of Y. Atoms of Y have more valence electrons than atoms of X. Which statement is correct? A Ions of X are …
- Question 28
The elements in Group I of the Periodic Table show trends in both their reactivities and their melting points. Rubidium is in Group I. Which statement about rubidium is correct? A It has a higher melting point than potassium. B …
- Question 29
The properties of four substances are shown. Which substance is a metal? A It conducts electricity when dissolved in water but not when solid. B It has a high melting point and conducts heat when solid. C It has a …
- Question 30
Group I elements and transition elements are metals. Student X suggests that the Group I elements are above hydrogen in the metal reactivity series but that not all transition elements are. Student Y suggests that the densities of Group I …
- Question 31
Tin is more reactive than lead but less reactive than iron. Which method would be most suitable for extracting tin from its ore? A electrolysis B heating alone C heating with carbon D reacting with hydrogen
- 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
Which reactions take place during the extraction of aluminium from aluminium oxide using carbon electrodes? …
- Question 34
Which statement about gases in the atmosphere is correct? A Carbon monoxide is a pollutant which causes acid rain. B Catalytic converters reduce carbon monoxide to carbon dioxide. C Methane in the atmosphere depletes the ozone layer. D Photosynthesis adds …
- 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
Compound X is shown in the dot-and-cross diagram. …
- 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
An ester has the formula C2H5COOC2H5. Which pair of compounds would react together to form this ester? A ethanoic acid and ethanol B ethanol and propanoic acid C propanoic acid and propanol D propanol and ethanoic 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
X is a polymer. When X is hydrolysed one of the products is substance Y. C NH2 CH3 H COOH Y Which type of polymer is …
Other Chemistry papers from May/June 2021
- 5070/12 Multiple choice
- 5070/21 Theory
- 5070/22 Theory
- 5070/41 Alternative to Practical
- 5070/42 Alternative to Practical