Cambridge IGCSE · 0620 · Paper 2 · Multiple choice (Extended)
Chemistry 0620/23 Oct/Nov 2024 past paper
Cambridge IGCSE Chemistry (0620) Paper 2 (Multiple choice (Extended)), variant 3, Oct/Nov 2024: 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
- 28
File names: 0620_w24_qp_23 · 0620_w24_ms_23
Grade thresholds for 0620/23 Oct/Nov 2024
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 | F | G |
|---|---|---|---|---|---|---|
| 28 | 24 | 21 | 19 | 17 | 15 | 13 |
Topics in this paper
Which syllabus chapters 0620/23 Oct/Nov 2024 tested, by marks. Each chapter links to every past-paper question on it.
Questions in 0620/23 Oct/Nov 2024
- Question 1
A sample of ethanol is left in an open beaker at room temperature. After 24 hours, no ethanol remains in the beaker. What has happened to the ethanol? A It has boiled. B It has condensed. C It has evaporated. …
- Question 2
A gas is in a sealed container with a fixed volume. Which statements describe what happens to the molecules in the gas when the temperature is increased? 1 They move more slowly. 2 They collide with the walls of the …
- Question 3
What happens when sodium atoms combine with chlorine atoms to form sodium chloride? A Sodium atoms each gain one electron, and chlorine atoms each lose one electron. B Sodium atoms each lose one electron, and chlorine atoms each gain one …
- Question 4
The table shows some properties of four substances. substance melting point electrical conductivity when solid electrical conductivity when molten 1 high poor poor 2 high poor good 3 low poor poor 4 high good good Which substances are ionic? …
- Question 5
Which statement about methane is correct? A In methane, positive hydrogen ions are attracted to negative carbon ions. B In methane, electrons are shared between carbon atoms and hydrogen atoms. C Methane has a high boiling point. D Methane is …
- Question 6
A sample of iridium has a relative atomic mass of 192.29. The sample contains two isotopes only. 64.50% of the sample is 193Ir. What is the other isotope in the sample? A 189Ir B 190Ir C 191Ir D 192Ir
- Question 7
Ammonium iron(III) citrate contains in its formula: ● more than one ammonium ion ● one iron ion ● two C6H4O7 4– ions. What is the formula of ammonium iron(III) citrate? A (NH4)4Fe(C6H4O7)2 B (NH4)5Fe(C6H4O7)2 C (NH4)6Fe(C6H4O7)2 D (NH4)7Fe(C6H4O7)2
- Question 8
Silicon(IV) oxide reacts with chlorine and carbon to form liquid silicon(IV) chloride, SiCl 4, and carbon dioxide gas. If the reaction is carried out at r.t.p., which symbol equation represents this reaction? A SiO2(l) + 2Cl …
- Question 9
The structure of ethene is shown. …
- Question 10
A known volume and concentration of aqueous sodium hydroxide is titrated against dilute hydrochloric acid. The volume of dilute hydrochloric acid needed to exactly neutralise the sodium hydroxide is measured. Five calculation steps are shown. 1 Calculate the amount of …
- Question 11
Two different substances are electrolysed using inert electrodes in two separate experiments. Hydrogen is produced in both experiments. Which row identifies the two substances and the electrode at which hydrogen is produced? substance 1 substance 2 electrode A molten sodium …
- Question 12
Aqueous copper(II) sulfate can be electrolysed using either carbon electrodes or copper electrodes. Which statement describes what happens at the positive electrode? A Copper is deposited if the electrode is made from carbon. B Copper is deposited if the electrode …
- Question 13
Which statement about a hydrogen–oxygen fuel cell is not correct? A Chemical energy is converted into electrical energy. B Hydrogen is oxidised. C The reaction that takes place is endothermic. D Water is the only chemical product.
- Question 14
Which reaction pathway diagram is correctly labelled? energy progress of reaction A reactants products Ea H Ea H energy progress of reaction B reactants products Ea H energy progress of reaction C reactants products H energy progress of reaction D …
- Question 15
Which row describes a reaction where the overall energy change is exothermic? energy needed for breaking bonds / kJ energy released by forming bonds / kJ temperature of the surroundings …
- Question 16
Which process involves a physical change only? A heating calcium carbonate strongly B burning wood C melting an ice cube D mixing an acid and a base
- Question 17
In the Haber process, an equilibrium is established. …
- Question 18
The flow chart shows some properties of a metal oxide. water + salt reduction metal oxide component of brass water + salt reaction with HCl (aq) reaction with NaOH(aq) What is the metal oxide? A aluminium oxide B copper(II) oxide …
- Question 19
Which statement about reactants in redox reactions is correct? A An oxidising agent donates electrons, and a reducing agent accepts electrons. B When one element gains electrons, the oxidation number of a different element increases. C When the oxidation number …
- Question 20
Aluminium is extracted from aluminium oxide by electrolysis. The ionic half-equation for the reaction at one of the electrodes is shown. Al …
- Question 21
Which statement about dilute hydrochloric acid is correct? A It is a strong acid as it fully dissociates. B It is a strong acid as it partially dissociates. C It is a weak acid as it fully dissociates. D It …
- Question 22
Which row describes and gives the formula of hydrated copper(II) sulfate? description of hydrated copper(II) sulfate formula of hydrated copper(II) sulfate A aqueous copper(II) sulfate CuSO4•5H2O B aqueous copper(II) sulfate CuSO4(aq) C copper(II) sulfate chemically combined with water molecules CuSO4(aq) …
- Question 23
The equations for three reactions are shown. 1 Pb(NO3)2(aq) + 2KI(aq) PbI2(s) + 2KNO3(aq) 2 2AgNO3(aq) + CuI2(aq) Cu(NO3)2(aq) + 2AgI(s) 3 CuO(s) + H2SO4(aq) CuSO4(aq) + H2O(l) Which reactions are suitable for making a salt by …
- Question 24
Acidified potassium dichromate(VI), K2Cr2O7, is used to oxidise ethanol, C2H5OH. The ionic equation for the reaction is shown. 3C2H5OH + 2Cr2O7 …
- Question 25
Which statements describe the Periodic Table? 1 The elements are arranged in order of their nucleon number. 2 The elements are arranged in order of their proton number. 3 It is used to predict the properties of elements. A 1 …
- Question 26
Which row shows the correct order of reactivity of the four named metals? most reactive least reactive A magnesium copper zinc silver B magnesium zinc copper silver C silver copper zinc magnesium D silver zinc copper magnesium
- Question 27
Four iron nails are added to four different metal sulfate solutions. In which solution does a displacement reaction occur? A copper(II) sulfate B magnesium sulfate C sodium sulfate D zinc sulfate
- Question 28
A fertiliser contains ammonium nitrate and potassium phosphate. Why is the fertiliser described as an NPK fertiliser? A It provides nitrogen, which is an essential element for improved plant growth. B It contains the element oxygen, which neutralises acidic soil. …
- Question 29
What are the approximate percentages of oxygen and nitrogen in clean, dry air? percentage of oxygen percentage of nitrogen …
- Question 30
Which compounds have similar chemical properties? A butanol and butanoic acid B ethane and ethene C methane and butane D propene and propanol
- Question 31
Four statements about organic compounds …
- Question 32
The structure of an organic compound is shown. …
- Question 33
Which statement about the manufacture of ethene from larger alkane molecules is correct? A A low temperature is required. B The process is called cracking. C The process requires an excess of oxygen. D Water is also a product.
- Question 34
Which processes are used to make ethanoic acid? 1 heating ethanol with acidified aqueous potassium manganate(VII) 2 bacterial oxidation of ethanol 3 distilling ethanol using a fractionating column A 1 and …
- Question 35
Which statement about propene, C3H6, is correct? A Propene reacts with bromine in the dark in a substitution reaction. B Propene reacts with steam in the presence of an alkaline catalyst, forming an alcohol. C Propene undergoes addition polymerisation, forming …
- Question 36
How many of each type of bond are present in ethanoic acid, CH3COOH? type of bond …
- Question 37
Which diagram represents the structure of a protein? …
- Question 38
The chromatogram of substance S is shown. Some distances, …
- Question 39
Some information about solid silver chloride and solid sodium chloride is shown. ● Silver chloride and sodium chloride do not dissolve in kerosene. ● Silver chloride is insoluble in water, but sodium chloride is soluble in water. ● The boiling …
- Question 40
Which statement describes how a flame test is done? A The tip of a clean wire is dipped into the substance and the wire is placed in a blue Bunsen burner flame. B The tip of a clean wire is …
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