Cambridge O Level · 5070 · Paper 1 · Multiple choice
Chemistry 5070/12 May/June 2025 past paper
Cambridge O Level Chemistry (5070) Paper 1 (Multiple choice), variant 2, May/June 2025: 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
- 29
File names: 5070_s25_qp_12 · 5070_s25_ms_12
Grade thresholds for 5070/12 May/June 2025
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 |
|---|---|---|---|---|
| 29 | 23 | 17 | 15 | 13 |
Topics in this paper
Which syllabus chapters 5070/12 May/June 2025 tested, by marks. Each chapter links to every past-paper question on it.
Questions in 5070/12 May/June 2025
- Question 1
At temperature X, the volume of samples of hexane and pentane are not affected by changing the pressure from 1 atm to 2 atm. At temperature X, the pentane molecules are free to move. At temperature X, the hexane molecules …
- Question 2
A gas is produced by a chemical reaction at one side of a laboratory. After a few minutes, the gas is detected at the other side of the laboratory. Which process explains why the gas is detected at the other …
- Question 3
Which statement is correct? A All compounds are ionic. B All compounds conduct electricity when molten. C Each atom of an element contains the same number of protons. D In a mixture of substances, the proportions of the substances are …
- Question 4
Atoms of element Q form positive ions. An ion of Q has 10 electrons and 14 neutrons. Which statement is correct? A An atom of Q has only two occupied electron shells. B Q is a non-metal. C The atomic …
- Question 5
Which particle contains the greatest number of electrons? A Mg2+ …
- Question 6
The table shows data about the two isotopes in a sample of the element europium. relative mass of isotope percentage abundance of isotope …
- Question 7
Which statement about magnesium oxide is correct? A It has a high melting point and good electrical conductivity at r.t.p. B It is made up of magnesium anions and oxygen cations. C It is an ionic compound and has good …
- Question 8
Which statement about silicon(IV) oxide is correct? A It conducts electricity. B It has a giant covalent structure. C It is an alloy. D It is ionically bonded.
- Question 9
Which compound has the highest relative formula mass, Mr? [Ar: …
- Question 10
100 cm3 of ethene is completely combusted in 400 cm3 of oxygen. The volumes of both gases are measured at r.t.p. What is the final volume of gas in the mixture measured at …
- Question 11
The formula of hydrated sodium carbonate is Na2CO3•10H2O. What is the percentage composition by mass of oxygen in hydrated sodium carbonate? …
- Question 12
The diagram shows the electrolysis of molten lead bromide with inert electrodes. power supply …
- Question 13
What are the products formed at the two electrodes when aqueous copper(II) sulfate is electrolysed using copper electrodes? anode product cathode product A aqueous copper(II) ions copper metal B aqueous copper(II) ions hydrogen gas C oxygen gas copper metal D …
- Question 14
Which statement about a hydrogen–oxygen fuel cell is correct? A It uses a chemical reaction that has only one product. B It works by burning hydrogen in air. C It requires a continuous input of electrical energy. D It is …
- Question 15
A reaction pathway diagram is shown. reactants products energy progress of reaction Which equation does the reaction pathway diagram show? …
- Question 16
Which process is a chemical change? A the distillation of aqueous ethanol B the evaporation of water from aqueous sodium chloride C the melting of wax D the rusting of iron
- Question 17
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 18
Magnesium reacts with dilute sulfuric acid. Mg(s) + H2SO4(aq) MgSO4(aq) + H2(g) Two experiments are carried out at 25 °C. experiment …
- Question 19
Which row gives the catalyst for each of the two processes? Contact process Haber process A iron iron B iron nickel C vanadium(V) oxide iron D vanadium(V) oxide nickel
- Question 20
The diagram shows the change in pH as a strong alkali is added to a weak acid. …
- Question 21
Which row shows the equations for the dissociation of methanoic acid and of nitric acid? methanoic acid nitric acid A HCOOH(aq) H+(aq) + HCOO–(aq) HNO3(aq) H+(aq) + NO3 –(aq) B HCOOH(aq) H+(aq) + HCOO–(aq) HNO3(aq) H+(aq) + …
- Question 22
Which statement about elements in the Periodic Table is correct? A Across a period, elements at the left-hand side of the Periodic Table are more metallic than those at the right-hand side. B Down a group, elements at the top …
- Question 23
Rubidium and caesium are both elements in Group I of the Periodic Table. Which prediction comparing rubidium and caesium is correct? A Caesium has the higher density and the greater reactivity. B Caesium has the higher density; rubidium has the …
- Question 24
Three statements about the halogens are listed. 1 All halogens are non-metallic diatomic molecules. 2 Chlorine displaces both bromine and iodine from aqueous solutions of their salts. 3 The halogens become more reactive on descending Group VII of the Periodic …
- Question 25
Which statements about neon are correct? 1 It is unreactive. 2 It has strong intermolecular forces. 3 It has a full outer shell of electrons. …
- Question 26
Substance X has the following properties. ● melting point …
- Question 27
Which statement explains why objects manufactured from aluminium corrode very slowly? A Aluminium is above hydrogen in the reactivity series. B Aluminium is below hydrogen in the reactivity series. C The objects become coated with a protective layer of aluminium …
- Question 28
The iron(III) oxide used in a blast furnace contains the impurity silicon(IV) oxide, SiO2. Which reaction removes the silicon(IV) oxide? A 3SiO2 + Fe2O3 2Fe + 3SiO3 B SiO2 …
- Question 29
The domestic water supply is treated before it is supplied to houses. Three treatments are listed. ● sedimentation and filtration ● treatment with chlorine ● treatment with carbon Which row shows the purpose of the treatments? sedimentation and filtration treatment …
- Question 30
Nitrates and ammonium salts are used as fertilisers. Which fertiliser contains the greatest mass of nitrogen in 50 kg of the compound? [Ar: …
- Question 31
Which strategy reduces methane emissions? A flue gas desulfurisation B planting more trees C reduction in livestock farming D use of catalytic converters
- Question 32
Compound P is an alcohol with the molecular formula C4H10O. How many structural isomers are there of compound …
- Question 33
Alkanes undergo a substitution reaction with chlorine. Which row shows two correct statements about the reaction between alkanes and chlorine? statement 1 statement …
- Question 34
A molecule of the compound C4H6 is shown. …
- Question 35
Which statement about members of the homologous series of alcohols is correct? A An alcohol with two carbon atoms in each molecule is called methanol. B Butanol can be combusted to give carbon dioxide and water only. C Ethanol is …
- Question 36
The diagram shows the structure of a compound called ethanoic anhydride. …
- Question 37
Four samples are analysed using paper chromatography. P, Q and R are pure substances. M is a mixture of different substances. solvent front baseline …
- Question 38
A student is making a sample of aqueous copper(II) sulfate. The student adds an excess of copper(II) oxide powder to warm sulfuric acid and stirs the mixture. Which apparatus is used to separate aqueous copper(II) sulfate from the excess copper(II) …
- Question 39
How can a pure sample of barium sulfate be obtained from barium carbonate? A Dissolve it in dilute hydrochloric acid, add dilute sulfuric acid, filter and crystallise. B Dissolve it in dilute hydrochloric acid, add dilute sulfuric acid, filter and …
- Question 40
A sample of a white powder, X, is dissolved in water. Tests are done on separate portions of this solution and the observations are shown in the table. test observation add aqueous sodium hydroxide a drop at a time until …
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