Cambridge O Level · 5070 · Paper 1 · Multiple choice
Chemistry 5070/11 May/June 2025 past paper
Cambridge O Level Chemistry (5070) Paper 1 (Multiple choice), variant 1, 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_11 · 5070_s25_ms_11
Grade thresholds for 5070/11 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 | 18 | 16 | 14 |
Topics in this paper
Which syllabus chapters 5070/11 May/June 2025 tested, by marks. Each chapter links to every past-paper question on it.
Questions in 5070/11 May/June 2025
- Question 1
Four gases are listed. 1 CH4 2 NH3 3 CO2 4 N2 What is the order of their rate of diffusion at room temperature and pressure? slowest fastest …
- Question 2
Sodium is added to water and a chemical reaction occurs. Hydrogen and aqueous sodium hydroxide are produced. Which row describes the reactants and products in this reaction? reactants and products that are elements reactants and products that are compounds reactants …
- Question 3
An atom of element X is shown. key = electrons = protons = neutrons Which element is X? A beryllium B boron C carbon D magnesium
- Question 4
Which definition of isotopes is correct? A atoms of different elements that have the same number of electrons B atoms of different elements that have the same number of neutrons C atoms of the same element that have different numbers …
- Question 5
A pure sample of element X has a relative atomic mass of 51.8. The sample consists of three isotopes. The table shows the relative masses and percentage abundances of two of the isotopes. relative mass of isotope percentage abundance of …
- Question 6
Magnesium reacts with oxygen to form magnesium oxide. 2Mg …
- Question 7
Which statement about solid calcium chloride is correct? A It conducts electricity. B It has a low melting point. C It has an ionic lattice structure. D It is insoluble in water.
- Question 8
Which description of metallic bonding is correct? A the electrostatic attraction between negative ions in a lattice and a ‘sea’ of electrons B the electrostatic attraction between negative ions in a lattice and a ‘sea’ of protons C the electrostatic …
- Question 9
The ions Ca2+ and PO4 3– combine to form an ionic compound. What is the formula of the compound? A Ca2PO4 B Ca(PO4)3 C Ca2(PO4)3 D Ca3(PO4)2
- Question 10
Magnesium reacts 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 11
An organic compound has an Mr of 88. What is the molecular formula of this compound? …
- Question 12
10 cm3 of hydrogen gas is mixed with x cm3 of chlorine gas. The equation for the reaction that takes place is shown. H2(g) + Cl 2(g) 2HCl (g) All the hydrogen reacts. The total volume of gas at …
- Question 13
100 cm3 of aqueous potassium hydroxide with a concentration of 1.00 mol / dm3 reacts with excess dilute sulfuric acid. 2KOH(aq) + H2SO4(aq) K2SO4(aq) …
- Question 14
Which statement about electrolysis is correct? A Negative anions move towards the positive cathode. B Negative cations move towards the positive cathode. C Positive anions move towards the negative cathode. D Positive cations move towards the negative cathode.
- Question 15
The diagram shows an electrolysis experiment using inert electrodes. L M aqueous copper(II) sulfate electrolyte dilute sulfuric acid electrolyte Which row shows what happens to the concentration of the electrolyte in L and in M as the electrolysis proceeds? …
- Question 16
Which row is correct for a chemical reaction in which H is negative? bond energy change type of reaction A energy of bonds broken greater than energy of bonds formed endothermic B energy of bonds broken less than energy of …
- Question 17
The diagram shows apparatus used to investigate two different reactions that produce gases. balance 5 g of solid X 100 cm3 1.0 mol / dm3 HCl The reactants for each experiment are mixed and the mass of flask plus contents …
- Question 18
In a closed flask, gases Q and R reach a dynamic equilibrium. …
- Question 19
Which row shows the typical conditions used for the conversion of sulfur dioxide to sulfur trioxide in the Contact process? catalyst pressure / kPa A iron …
- Question 20
The pH of dilute ethanoic acid is measured. The equation for the partial dissociation of ethanoic acid is shown. CH3COOH(aq) CH3COO–(aq) + H+(aq) Aqueous sodium ethanoate, CH3COONa, is added to the dilute ethanoic acid and the pH is measured again. …
- Question 21
Which element reacts with oxygen to produce an amphoteric oxide? A carbon B copper C sulfur D zinc
- Question 22
Element X is in Period 2 of the Periodic Table. X reacts with magnesium to form an ionic compound with the formula MgX2. What is X? A chlorine B fluorine C oxygen D sulfur
- Question 23
Rubidium is an element in Group I of the Periodic Table. Which statement about rubidium is correct? A It has a higher melting point than potassium. B It reacts with water to produce an acidic solution. C It reacts with …
- Question 24
Which statement is correct? A Noble gases are unreactive because they all have eight electrons in their outer shells. B The Group VII element astatine, At2, is expected to be a black solid at room temperature. C The reactivity of …
- Question 25
M is a metal that forms coloured compounds. M is extracted from its oxide either by heating with carbon or by electrolysis. M reacts with dilute hydrochloric acid. What is M? A copper or magnesium B copper only C iron …
- Question 26
Which statement about brass is correct? A It is a compound. B It is an alloy. C It is an isomer. D It is an isotope.
- Question 27
Iron is galvanised with zinc to prevent rusting. Which type of protection is provided by galvanising? A alloy formation B barrier and sacrificial C barrier only D sacrificial only
- Question 28
Iron is extracted from its ore hematite 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 the blast furnace, a …
- Question 29
Chlorine and carbon are both used in the treatment of the domestic water supply. Which row describes one reason for the use of each substance? chlorine carbon A causes the sedimentation of some solids removes tastes from the water B …
- Question 30
Which row states an adverse effect for the named pollutant? air pollutant adverse effect A carbon dioxide increases plant growth B methane causes cancer C oxides of nitrogen photochemical smog D particulates acid rain
- Question 31
Three statements about global warming and greenhouse gases are listed. 1 Global warming is occurring because more of the Earth’s thermal energy is released to space. 2 Greenhouse gases both absorb and emit thermal energy. 3 Greenhouse gas levels in …
- Question 32
Which compound is an alcohol? …
- Question 33
An ester has the structural formula CH3COOCH2CH2CH3. What is the name of this ester? A ethyl propanoate B methyl propanoate C propyl ethanoate D propyl methanoate
- Question 34
Petroleum is separated into fractions in a fractionating column. Which property of the fractions increases from the bottom to the top of the column? A boiling point B chain length C viscosity D volatility
- Question 35
Three statements about alkanes are listed. 1 They contain carbon and hydrogen only. 2 They contain only single covalent bonds. 3 They are saturated hydrocarbons. Which statements are correct? …
- Question 36
The flowchart shows some reactions of hydrocarbons. saturated hydrocarbon with large molecules unsaturated hydrocarbons with small molecules saturated hydrocarbons with small molecules process …
- Question 37
The structure of a condensation polymer is shown. N H CH2 C O CH2 CH2 …
- Question 38
A titration is completed. 25.0 cm3 of aqueous sodium hydroxide is added to a conical flask. A few drops of methyl orange indicator are added. Dilute hydrochloric acid is added slowly to the mixture until the colour changes. Which row …
- Question 39
An impure sample of compound X has a melting point of …
- Question 40
Samples of two compounds, P and Q, are tested. The result of each test is shown. test P Q add dilute hydrochloric acid gas given off that turns limewater milky no observable change acidify with dilute nitric acid then add …
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