Cambridge IGCSE · 0620 · Paper 2 · Multiple choice (Extended)
Chemistry 0620/21 Oct/Nov 2023 past paper
Cambridge IGCSE Chemistry (0620) Paper 2 (Multiple choice (Extended)), variant 1, 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
- 27
File names: 0620_w23_qp_21 · 0620_w23_ms_21
Grade thresholds for 0620/21 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 | F | G |
|---|---|---|---|---|---|---|
| 27 | 22 | 18 | 17 | 15 | 13 | 11 |
Topics in this paper
Which syllabus chapters 0620/21 Oct/Nov 2023 tested, by marks. Each chapter links to every past-paper question on it.
Questions in 0620/21 Oct/Nov 2023
- Question 1
A gas is placed in a sealed container. The gas has a pressure of one atmosphere and a temperature of 50 C. It is heated to 100 C. Which row describes the cause of the pressure of the gas and …
- Question 2
Four experiments, each containing a different acidic gas, are set up as shown. The dividing glass plates are removed at the same time. In which set of apparatus does the litmus turn red first? A air glass plate damp blue …
- Question 3
The Group I element potassium forms an ionic bond with the Group VII element fluorine. Which two ions are produced? A K+ and …
- Question 4
X and Y are atoms. ● X and Y have the same number of electron shells. ● X and Y have the same number of outer electrons. ● X and Y have different mass numbers. Which statements about X and …
- Question 5
Lithium chloride is an ionic compound and silicon(IV) oxide is a covalent compound. Which statement about both compounds is correct? A They are not soluble in water. B They conduct electricity when melted. C They do not conduct electricity in …
- Question 6
Which equations are balanced? 1 Fe2O3 + 3CO 2Fe + 3CO2 2 ZnCO3 + 2HCl ZnCl 2 + CO2 …
- Question 7
Which row shows the formulae of sodium carbonate, zinc nitrate and ammonium sulfate? sodium carbonate zinc nitrate ammonium sulfate A Na2CO3 ZnNO3 (NH4)2SO4 B Na2CO3 Zn(NO3)2 (NH4)2SO4 C NaCO3 ZnNO3 (NH3)2SO4 D NaCO3 Zn(NO3)2 (NH3)2SO4
- Question 8
Which statements about hydrogen and oxygen are correct? hydrogen and oxygen can react to produce electrical energy hydrogen and oxygen can be made by the electrolysis of dilute aqueous sodium chloride …
- Question 9
Graphite has a giant covalent structure. Which statements about graphite are correct? 1 Carbon atoms form four covalent bonds with neighbouring atoms. 2 There are delocalised electrons between layers of carbon atoms. 3 Graphite is a useful lubricant. 4 Graphite …
- Question 10
Which reaction pathway diagram represents an endothermic reaction? energy reactants products …
- Question 11
Hydrogen burns in oxygen. The equation for the reaction is shown. …
- Question 12
Which process involves a chemical change? A adding sodium to water B boiling water C dissolving sodium chloride in water D producing water from aqueous sodium chloride
- Question 13
An experiment is carried out to find the rate of reaction between hydrochloric acid and zinc. Zn(s) + 2HCl (aq) ZnCl 2(aq) + H2(g) The results of the experiment are shown. time y-axis 0 0 What is the label …
- Question 14
Hydrogen peroxide, H2O2, decomposes to form water and oxygen. 2H2O2(aq) …
- Question 15
Sulfuric acid is produced by the Contact process. Which row shows the typical conditions used in the process? catalyst pressure / kPa temperature …
- Question 16
Which equation shows the reduction of copper? A CuO …
- Question 17
Which statement about acids is correct? A A weak acid partially dissociates in aqueous solution. B An acid accepts protons when added to water. C Ethanoic acid acts as a strong acid when added to water. D Hydrochloric acid is …
- Question 18
Copper(II) sulfate is formed by reacting excess solid copper(II) carbonate with dilute sulfuric acid. Which processes are part of the preparation of solid copper(II) sulfate? 1 crystallisation 2 distillation 3 filtration 4 titration A 1 and …
- Question 19
Which type of reaction is represented by the equation shown? Pb2+(aq) + 2NO3 –(aq) + 2Na+(aq) + 2I–(aq) PbI2(s) + 2Na+(aq) + 2NO3 –(aq) A addition B redox C neutralisation D precipitation
- Question 20
Which compound is likely to be coloured? A KMnO4 B KNO3 C K2CO3 D K2SO4
- Question 21
Which statements about the metal zinc are correct? 1 It is extracted from the ore bauxite. 2 It is used to galvanise steel. 3 It is used to make the alloy brass. 4 It reacts with dilute hydrochloric acid to …
- Question 22
The electronic configurations of four elements, …
- Question 23
Which row compares the strength of alloys with pure metals and explains the difference in strength? strength of an alloy compared to a pure metal explanation A weaker larger atoms slide more easily over smaller atoms B weaker larger atoms …
- Question 24
Zinc oxide reacts with carbon to produce zinc. Which equation represents this reaction? A 2ZnO …
- Question 25
When a piece of aluminium foil is added to dilute hydrochloric acid, no effervescence is seen. Which statement explains why no effervescence is seen? A Aluminium does not make a gas when it reacts with an acid. B Aluminium has …
- Question 26
Iron nails are stored in an airtight container. lid air iron nails The nails begin to rust after a few days. How can the rusting of the nails be prevented? A Leave the lid off. B Replace the air with …
- Question 27
Four substances present in the blast furnace during iron extraction are listed. 1 calcium carbonate 2 carbon dioxide 3 carbon monoxide 4 iron(III) oxide Which substances are both a reactant and a product during the reactions occurring in the blast …
- Question 28
Aluminium is extracted from purified bauxite by electrolysis. Which row shows the ionic half-equations for the reaction at each electrode? anode cathode A Al Al …
- Question 29
Which test is used to show that a sample of water is pure? A Evaporate the water to see if any solids remain. B Heat the water to check its boiling point. C Test with anhydrous cobalt(II) chloride. D Use …
- Question 30
Catalytic converters in car exhausts change polluting gases into non-polluting gases. Which statements about oxides of nitrogen and car engines are correct? 1 The nitrogen in oxides of nitrogen comes from compounds in gasoline. 2 The oxygen in oxides of …
- Question 31
The structures of two molecules, X and Y, are shown. …
- Question 32
What is the structure of butanoic acid? …
- Question 33
When a mixture of methane and chlorine is exposed to ultraviolet light, a reaction takes place. Which statements about this reaction are correct? 1 It is an addition reaction. 2 The ultraviolet light provides the activation energy. 3 An equation …
- Question 34
Esters are formed when a carboxylic acid reacts with an alcohol. What is the catalyst for this reaction? A aqueous potassium manganate(VII) B iron C sulfuric acid D vanadium(V) oxide
- Question 35
The diagram shows part of a polymer. …
- Question 36
Nylon and PET are polymers. Which statements about these polymers are correct? 1 They are both condensation polymers. 2 HOCH2CH2CH2OH could be a monomer for both polymers. 3 The complete combustion of both polymers gives two products only. A 1 …
- Question 37
Ethane is used as a fuel. Which equation shows the complete combustion of ethane? …
- Question 38
The painkiller paracetamol is synthesised from 4-aminophenol. Chromatography is done on an impure sample of paracetamol. The results are shown. The diagram is not drawn to scale. P S solvent front baseline key …
- Question 39
The equation for the reaction of aqueous calcium nitrate and aqueous sodium hydroxide is shown. Ca(NO3)2(aq) + 2NaOH(aq) Ca(OH)2(s) + 2NaNO3(aq) Which process is used to remove calcium hydroxide from the mixture? A chromatography B crystallisation C distillation D …
- Question 40
The results of two tests on aqueous compound X are given. test result warm with aluminium foil and aqueous sodium hydroxide ammonia is produced aqueous sodium hydroxide brown precipitate What is X? A iron(III) nitrate B iron(II) nitrate C iron(III) …
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