Cambridge O Level · 5070 · Paper 1 · Multiple choice
Chemistry 5070/12 Oct/Nov 2023 past paper
Cambridge O Level Chemistry (5070) Paper 1 (Multiple choice), variant 2, Oct/Nov 2023: 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
- 25
File names: 5070_w23_qp_12 · 5070_w23_ms_12
Grade thresholds for 5070/12 Oct/Nov 2023
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 |
|---|---|---|---|---|
| 25 | 20 | 16 | 14 | 12 |
Topics in this paper
Which syllabus chapters 5070/12 Oct/Nov 2023 tested, by marks. Each chapter links to every past-paper question on it.
Questions in 5070/12 Oct/Nov 2023
- Question 1
A solid substance is placed in a flask. The flask is gently heated and the temperature of the substance is recorded at regular time intervals. The diagram shows a graph of temperature against time for this experiment. At which point …
- Question 2
A crystal of sodium chloride is dropped into a beaker of water and the crystal dissolves. There are four stages in this process. 1 The water molecules collide with the ions in the crystal lattice. 2 The ionic bonds in …
- Question 3
W is ethene, X is air, Y is iodine and Z is brass. Which row is correct? element compound mixture …
- Question 4
Which statement about the isotopes of bromine is correct? A They are atoms with the same number of electrons and a different number of protons. B They are atoms with the same number of neutrons and the same number of …
- Question 5
Which diagram shows a section of the ionic lattice of sodium chloride? Na+ Na+ A Na+ Na+ Cl – Cl – Cl – Cl – Na+ Na+ B Cl – Cl – Cl – Na+ Na+ Cl – Na– Na– …
- Question 6
When dilute hydrochloric acid is added to aqueous lead(II) nitrate, a white precipitate of lead(II) chloride is formed. What is the ionic equation for this reaction? A Pb2+(aq) + 2HCl (aq) PbCl 2(s) + 2H+(aq) B Pb2+(aq) + 2HCl …
- Question 7
Which row shows a pair of molecules where the Mr of compound X is exactly half that of compound Y? [Ar: C, 12; Cl, …
- Question 8
One volume of a gaseous element, X2, combines with an equal volume of gaseous hydrogen to form two volumes of a gaseous hydride. What is the formula for the hydride of …
- Question 9
Which reaction would produce the greatest volume of carbon dioxide at room temperature and pressure? [Mr: CaCO3, 100; Na2CO3, 106; CuCO3, 124] A burning 1 g of carbon in excess oxygen …
- Question 10
Chrome alum is the common name for a salt which has the formula CrK(SO4)2. What is the percentage by mass of chromium in chrome alum? …
- Question 11
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 12
Aqueous copper(II) sulfate is electrolysed using copper electrodes. Which row correctly describes what happens? mass of anode mass of cathode colour of electrolyte A increases decreases remains blue B remains the same decreases becomes colourless C decreases increases remains blue …
- Question 13
Hydrogen reacts with chlorine to form hydrogen chloride. H2(g) + Cl 2(g) 2HCl (g) The enthalpy change, H, for this reaction can be calculated using bond energies. bond bond energy in kJ / mol H–H 436 Cl –Cl 242 …
- Question 14
Nitrogen and oxygen react as shown. …
- Question 15
Physical changes and chemical changes can occur in substances. Which process describes a chemical change? A covalent bonds in methane molecules are broken B intermolecular attractions between water molecules are broken C ionic bonds in a sodium chloride lattice are …
- Question 16
Two methods used by students to measure the rate of a reaction are the ‘disappearing cross’ method and the ‘loss of mass’ method. ● For the ‘disappearing cross’ method, the student measures the time taken for the reaction mixture to …
- Question 17
Hydrogen is used as a reactant both in the Haber process and in its addition to alkenes. Which row is correct? catalyst in the Haber process product of addition of hydrogen to an alkene A iron alkane B iron alcohol …
- Question 18
Chlorine, Cl 2, reacts with iron(II), Fe2+, ions. Cl 2 + 2Fe2+ 2Cl – + 2Fe3+ Which statement about this reaction is correct? A Chlorine is oxidised. B Cl – ions are formed by loss of electrons. C Fe2+ …
- Question 19
Which statement is correct? A A base will react with an ammonium salt to produce a gas that turns damp blue litmus paper red. B Adding a base to an acidic solution will increase the pH of the solution. C …
- Question 20
Information about three oxides, Q, R and T, is given. Q reacts with dilute sulfuric acid to form a salt and water. R reacts with both acids and bases to form a salt and water. T reacts with aqueous sodium …
- Question 21
Which definition of a hydrated substance is correct? A A hydrated substance is a soluble ionic compound such as barium sulfate. B A hydrated substance is an ionic compound that contains no water. C A hydrated substance is one that …
- Question 22
A student has five reagents. ● dilute hydrochloric acid ● dilute sulfuric acid ● dilute nitric acid ● solid calcium carbonate ● solid copper(II) carbonate How many soluble salts can be prepared from these five reagents? …
- Question 23
The table shows the number of electrons in one atom of each of the elements …
- Question 24
Some properties of elements in Group VII and the reasons for these properties are shown. Which row shows a property and the reason for this property? property reason for the property A all the elements exist as diatomic molecules each …
- Question 25
Aircraft manufacture requires a metal that: 1 has a relatively low density 2 is resistant to corrosion. Which properties apply to aluminium? A both 1 and …
- Question 26
Which diagram represents an alloy? …
- Question 27
A small piece of metal is added to a large beaker of water. A vigorous reaction occurs. When the reaction stops, a few drops of litmus are added to the solution. What is the metal and which colour is the …
- Question 28
The rusting of iron can be prevented by coating the iron with another material. Which statement explains why coating with zinc is more effective than painting? A If the coating is damaged, zinc corrodes instead of iron. B Iron is …
- Question 29
The list shows the position of metal X in the reactivity series of metals. Na Al Fe X Cu Ag Which methods could be used to extract metal X? 1 electrolysis of the solid metal oxide 2 heating the metal …
- Question 30
Which statement about water is correct? A Distillation is used to remove insoluble impurities from the domestic water supply. B Water containing impurities turns anhydrous copper(II) sulfate blue. C Water containing impurities turns cobalt(II) chloride paper blue. D Water containing …
- Question 31
Some compounds that can be used as fertilisers are listed. ● ammonium nitrate ● potassium nitrate ● potassium phosphate ● sodium phosphate Three of the elements required for plant growth have the atomic symbols N, P and K. How many …
- Question 32
Different strategies to reduce the effects of environmental issues have been suggested. Which row is correct? strategy to reduce the effects of climate change strategy to reduce the effects of acid rain A reduction in livestock farming planting trees B …
- Question 33
Which statement about organic compounds is correct? A Each molecule of propan-1-ol has one –OH group and each molecule of propan-2-ol has two –OH groups. B Octane and decane are in a homologous series with the general formula CnH2n. C …
- Question 34
In the fractional distillation of petroleum, different fractions are obtained at the top and bottom of the fractionating column. Which properties does the fraction obtained at the top of the fractionating column have, compared with the fraction obtained at the …
- Question 35
A chlorine atom can replace a hydrogen atom in a molecule of butane, CH3CH2CH2CH3, to form chlorobutane. How many different structural isomers of chlorobutane can be formed? …
- Question 36
Two statements are shown. 1 When ethanol is made from glucose by fermentation, each glucose molecule produces three molecules of ethanol. 2 When ethanoic acid is made from ethanol, the ethanol acts as an oxidising agent. Which row about these …
- Question 37
Polymer X is an addition polymer. The monomer used to make X is but-1-ene. Polymer Y is a condensation polymer. The monomers used to make Y are HOCH2CH2OH and HOOCCH2COOH. Which statement about X and Y is correct? A The …
- Question 38
Which statement is correct? A A filtrate is a substance that remains on the filter paper after filtration. B A saturated solution has the maximum amount of solvent dissolved in the solute. C A solution is a compound produced when …
- Question 39
The diagram shows a chromatogram. Which spot has an Rf value of 0.75? baseline solvent front …
- Question 40
The results of some tests on polluted river water are shown. reagent observation on adding reagent slowly observation on adding excess reagent aqueous sodium hydroxide white precipitate precipitate dissolves to give a colourless solution aqueous ammonia white precipitate no further …
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