Cambridge IGCSE · 0620 · Paper 2 · Multiple choice (Extended)
Chemistry 0620/21 May/June 2021 past paper
Cambridge IGCSE Chemistry (0620) Paper 2 (Multiple choice (Extended)), variant 1, May/June 2021: 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
- 26
File names: 0620_s21_qp_21 · 0620_s21_ms_21
Grade thresholds for 0620/21 May/June 2021
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 |
|---|---|---|---|---|---|---|
| 26 | 22 | 18 | 16 | 14 | 12 | 10 |
Topics in this paper
Which syllabus chapters 0620/21 May/June 2021 tested, by marks. Each chapter links to every past-paper question on it.
Questions in 0620/21 May/June 2021
- Question 1
A gas is released at point P in the apparatus shown. P damp universal indicator paper Which gas turns the damp universal indicator paper red most quickly? A ammonia, NH3 B chlorine, Cl 2 C hydrogen chloride, HCl D sulfur …
- Question 2
A mixture is separated using the apparatus shown. mixture funnel filter paper What is the mixture? A aqueous copper(II) sulfate and aqueous sodium chloride B aqueous copper(II) sulfate and copper C copper and sulfur D ethanol and ethanoic acid
- Question 3
Which statement about paper chromatography is correct? A A solvent is needed to dissolve the paper. B Paper chromatography separates mixtures of solvents. C The solvent should cover the baseline. D The baseline should be drawn in pencil.
- Question 4
Element X has 7 protons. Element Y has 8 more protons than X. Which statement about element Y is correct? A Y has more electron shells than …
- Question 5
A covalent molecule Q contains only six shared electrons. What is Q? A ammonia, NH3 B chlorine, Cl 2 C methane, CH4 D water, H2O
- Question 6
The arrangement of particles in each of two solids, S and T, are shown. S T What are S and …
- Question 7
Which statement about metals is correct? A Metals conduct electricity when molten because negative ions are free to move. B Metals conduct electricity when solid because positive ions are free to move. C Metals are malleable because the bonds between …
- Question 8
Two elements, P and Q, are in the same period of the Periodic Table. P and Q react together to form an ionic compound. Part of the lattice of this compound is shown. …
- Question 9
2.56 g of a metal oxide, MO2, is reduced to 1.92 g of the metal, M. What is the relative atomic mass of …
- Question 10
In separate experiments, electricity was passed through concentrated aqueous sodium chloride and molten lead(II) bromide. What would happen in both experiments? A A halogen would be formed at the anode. B A metal would be formed at the cathode. C …
- Question 11
What is the ionic half-equation for the reaction that occurs at the cathode when molten lead(II) bromide is electrolysed? A Pb2+ …
- Question 12
The complete combustion of propane is exothermic. The equation for this reaction is shown. …
- Question 13
Which equation represents a reaction that takes place in a fuel cell? …
- Question 14
When sulfur is heated it undergoes a 1 change as it melts. Further heating causes the sulfur to undergo a 2 change and form sulfur dioxide. Which words complete gaps 1 and …
- Question 15
Four statements about the effect of increasing temperature on a reaction are shown. 1 The activation energy becomes lower. 2 The particles move faster. 3 There are more collisions between reacting particles per second. 4 There are more collisions which …
- Question 16
An example of a redox reaction is shown. Zn + Cu2+ Zn2+ + Cu Which statement about the reaction is correct? A Zn is the oxidising agent and it oxidises Cu2+. B Zn is the oxidising agent and it …
- Question 17
Which statement about a reaction in equilibrium is correct? A Both the forward and the backward reactions are proceeding at the same rate. B Neither the forward nor the backward reaction is proceeding. C The amount of product present is …
- Question 18
Element X forms an oxide, XO, that neutralises sulfuric acid. Which row describes X and XO? element X nature of oxide, XO A metal acidic B metal basic C non-metal acidic D non-metal basic
- Question 19
Copper(II) sulfate is prepared by adding excess copper(II) oxide to warm dilute sulfuric acid. Which purification methods are used to obtain pure solid copper(II) sulfate from the reaction mixture? 1 crystallisation 2 filtration 3 chromatography 4 distillation A 1 and …
- Question 20
Some reactions of element M are shown. element M oxide of M solution add blue litmus add to purple acidified potassium manganate(VII) goes red burn add water goes colourless What is element M? A carbon B iron C magnesium D …
- Question 21
In which equation is the underlined reactant acting as a base? A CH3COO– …
- Question 22
Why is helium used to fill balloons? A Helium is monoatomic. B Helium is in Group VIII of the Periodic Table. C Helium has a full outer electron shell. D Helium is less dense than air.
- Question 23
Which elements in the table are transition elements? element property E forms E3+ ions only F forms F+ and F2+ ions G forms only white salts H used in catalytic converters A E and …
- Question 24
Element R forms a covalent compound R2Si with silicon. Which row describes R? metallic or non-metallic character group number in the Periodic Table A metallic II B metallic VI C non-metallic II D non-metallic VI
- Question 25
Some properties of metal J are listed. ● J does not react with cold water. ● J reacts with dilute hydrochloric acid. ● No reaction occurs when the oxide of J is heated with carbon. What is J? A copper …
- Question 26
Some metal nitrates and carbonates decompose when heated strongly. Metal Q has a nitrate that decomposes to give a salt and a colourless gas only. The carbonate of metal Q does not decompose when heated with a Bunsen burner. What …
- Question 27
Which substances are used in the extraction of aluminium? A bauxite and cryolite B bauxite and hematite C cryolite and zinc blende D hematite and zinc blende
- Question 28
Different types of steel alloys are manufactured by changing the percentage of carbon in the alloy. The properties of four steel alloys are shown. alloy mixture percentage of carbon in the alloy strength of the alloy hardness of the alloy …
- Question 29
Ammonia is made by reacting nitrogen with hydrogen in the Haber process. The equation for the process is shown. …
- Question 30
Which process removes carbon dioxide from the atmosphere? A combustion of fossil fuels B fermentation C photosynthesis D respiration
- Question 31
Which catalyst is used in the Contact process? A calcium oxide B iron C manganese(II) oxide D vanadium(V) oxide
- Question 32
A white solid Z reacts with dilute hydrochloric acid to produce a gas. The same gas is produced when compound Z is heated strongly. What is Z? A calcium B calcium carbonate C calcium hydroxide D calcium oxide
- Question 33
What is the structure of butanoic acid? A CH3CH2CO2H B CH3CH2CH2CO2H C CH3CH2CH2CH2CO2H D CH3CH2CH2CO2CH3
- Question 34
Compound Z contains carbon, hydrogen and oxygen. Molecules of compound Z have four hydrogen atoms and two carbon atoms. Compound Z can be made by oxidation of an alcohol. What is compound Z? A ethene B ethanol C ethanoic acid …
- Question 35
Which statement about homologous series and isomerism is correct? A Butane and butene are structural isomers. B Compounds in the same homologous series have the same general formula. C Compounds in the same homologous series have the same molecular formula. …
- Question 36
Which statement about alkanes is correct? A They burn in oxygen. B They contain carbon, hydrogen and oxygen atoms. C They contain double bonds. D They contain ionic bonds.
- Question 37
What is an advantage of manufacturing ethanol by fermentation? A The process is very fast. B The ethanol requires no separation. C The raw materials used are renewable. D There are no other products formed.
- Question 38
P, Q, R and S are four organic compounds. P is an unsaturated hydrocarbon. Q burns but otherwise is unreactive. R contains a C–C single bond and a C=C double bond. S undergoes addition polymerisation. Which compounds are alkenes? A …
- Question 39
The structure of a synthetic polymer is shown. …
- Question 40
Which substance is a natural polymer? A ethene B Terylene C nylon D protein Group The Periodic Table of Elements 1 H hydrogen 1 2 He helium 4 I II III IV V VI VII VIII 3 Li lithium 7 …
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