Cambridge IGCSE · 0620 · Paper 2 · Multiple choice (Extended)
Chemistry 0620/23 Oct/Nov 2021 past paper
Cambridge IGCSE Chemistry (0620) Paper 2 (Multiple choice (Extended)), variant 3, Oct/Nov 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
- 25
File names: 0620_w21_qp_23 · 0620_w21_ms_23
Grade thresholds for 0620/23 Oct/Nov 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 |
|---|---|---|---|---|---|---|
| 25 | 21 | 18 | 16 | 14 | 13 | 12 |
Topics in this paper
Which syllabus chapters 0620/23 Oct/Nov 2021 tested, by marks. Each chapter links to every past-paper question on it.
Questions in 0620/23 Oct/Nov 2021
- Question 1
Brownian motion and the diffusion of gases provide evidence for the particulate nature of matter. Which row identifies an example of Brownian motion and how molecular mass determines the rate of diffusion of gas molecules? Brownian motion diffusion A pollen …
- Question 2
A student put exactly 25.00 cm3 of dilute hydrochloric acid into a conical flask. The student added 2.5 g of solid sodium carbonate and measured the change in temperature of the mixture. Which apparatus does the student need to use? …
- Question 3
A student separates sugar from pieces of broken glass by dissolving the sugar in water and filtering off the broken glass. filtrate What is the filtrate? A broken glass only B broken glass and sugar solution C pure water D …
- Question 4
The nucleus of a particular atom consists of nineteen particles. Nine of them are positively charged and ten of them are uncharged. Which statement about this nucleus is correct? A The nucleus has a nucleon number of nine. B The …
- Question 5
Which description of brass is correct? A alloy B compound C element D non-metal
- Question 6
A Group I element combines with a Group VII element and forms an ionic bond. Which row shows how the electronic structures change? Group I element Group VII element before bonding after bonding before bonding after bonding …
- Question 7
Which statement describes the attractive forces between molecules? A They are strong covalent bonds which hold molecules together. B They are strong ionic bonds which hold molecules together. C They are weak forces formed between covalently-bonded molecules. D They are …
- Question 8
Which diagram shows the outer electron arrangement in a molecule of carbon dioxide? …
- Question 9
Aluminium oxide is an ionic compound containing Al 3+ ions and O2– ions. Aluminium hydroxide is an ionic compound containing Al 3+ ions and OH– ions. In which row are the formulae for aluminium oxide and aluminium hydroxide correct? aluminium …
- Question 10
Effervescence is observed at the negative electrode (cathode) during the electrolysis of concentrated aqueous sodium chloride. Which element is produced at the negative electrode (cathode)? A chlorine B hydrogen C oxygen D sodium
- Question 11
The energy level diagram for a chemical reaction is shown. energy progress of reaction reactants products Which statement about this reaction is correct? A The reaction is endothermic and energy is given out to the surroundings. B The reaction is …
- Question 12
Chlorine reacts with ethane to produce chloroethane and hydrogen chloride. …
- Question 13
What is the concentration of the solution when 31.8 g of sodium carbonate, Na2CO3, is dissolved in water to make a solution of 250 cm3? A 0.075 mol / dm3 B 0.30 mol / dm3 C 1.2 mol / dm3 …
- Question 14
A fuel cell is used to generate electricity. Which chemicals are used in a fuel cell? A hydrogen and methane B hydrogen and oxygen C nitrogen and methane D nitrogen and oxygen
- Question 15
Sulfuric acid is manufactured using the Contact process. One of the reactions is shown. 2SO2(g) + O2(g) 2SO3(g) The forward reaction is exothermic. statement 1 The equation has more molecules on the left-hand side than on the right-hand side. statement …
- Question 16
Iron(II) chloride solution reacts with chlorine gas. The equation is shown. 2FeCl 2(aq) + Cl 2(g) 2FeCl 3(aq) Which statements about this reaction are correct? 1 Fe2+ ions are reduced to Fe3+ ions. 2 Chlorine acts as a reducing …
- Question 17
Excess dilute hydrochloric acid is added to equal masses of powdered calcium carbonate in two separate experiments. Two different concentrations of hydrochloric acid are used. The temperature in both experiments is the same. The results show the change in mass …
- Question 18
Basic oxides are neutralised by acidic oxides. Which element forms an oxide that neutralises calcium oxide? A hydrogen B magnesium C sodium D sulfur
- Question 19
Four solid oxides are added to dilute hydrochloric acid and aqueous sodium hydroxide. Which row describes an amphoteric oxide? hydrochloric acid sodium hydroxide …
- Question 20
Which row describes an acid and an oxidising agent? acid oxidising agent A proton acceptor electron acceptor B proton acceptor electron donor C proton donor electron acceptor D proton donor electron donor
- Question 21
A period of the Periodic Table is shown. group I II III IV V VI VII VIII element …
- Question 22
Part of the Periodic Table is shown. …
- Question 23
Which property is shown by transition metals but not shown by Group I metals? A good electrical conductivity B good thermal conductivity C loss of electrons to form positive ions D variable oxidation states
- Question 24
The noble gases are in Group VIII of the Periodic Table. Which statement explains why noble gases are unreactive? A They all have eight electrons in their outer shells. B They all have full outer shells. C They are all …
- Question 25
Which statement is correct for all metals? A They conduct electricity when molten. B They gain electrons when they form ions. C They have a low density. D They have a low melting point.
- Question 26
Chromium is a more reactive metal than iron but less reactive than zinc. Which statements are correct? 1 Chromium does not react with dilute hydrochloric acid. 2 Chromium oxide is reduced when it is heated with carbon. 3 Chromium reacts …
- Question 27
Aluminium objects do not need protection from corrosion. Iron objects must be protected from corrosion. Which statement explains why aluminium resists corrosion? A Aluminium does not form ions easily. B Aluminium does not react with water or air. C Aluminium …
- Question 28
Which statement describes how oxides of nitrogen are formed in a car engine? A Nitrogen from the air reacts with oxygen from petrol. B Nitrogen from the air reacts with oxygen from the air. C Nitrogen from petrol reacts with …
- Question 29
Ships are made of steel, an alloy of iron. Blocks of magnesium are attached to the underside of ships to prevent rusting. Which statement explains how the magnesium prevents rusting? A Magnesium oxidises instead of iron. B Magnesium stops air …
- Question 30
Which process is used to produce hydrogen for the Haber process? A electrolysis of water B reacting aluminium with sodium hydroxide C reacting iron with sulfuric acid D reacting methane with steam
- Question 31
One of the steps in manufacturing sulfuric acid in the Contact process is shown. 2SO2(g) + O2(g) 2SO3(g) Which catalyst is used to increase the rate of this reaction? A aluminium oxide B iron C phosphoric acid D vanadium(V) oxide
- Question 32
Lime (calcium oxide) is used to treat waste water from a factory. Which substance is removed by the lime? A ammonia B sodium chloride C sodium hydroxide D sulfuric acid
- Question 33
What is the structure of propanol? …
- Question 34
Fuel X produces carbon dioxide and water when it is burned in air. So does fuel Y. What could X and Y be? …
- Question 35
What is the main constituent of natural gas? A hydrogen B carbon monoxide C methane D nitrogen
- Question 36
Which statement describes the members of a homologous series? A compounds with the same physical properties B compounds containing the same functional group C compounds containing the same number and type of bonds D compounds obtained from the same raw …
- Question 37
The structures of two compounds are shown. …
- Question 38
Some reactions of substance Q are shown. Q P add bromine add hydrogen and a catalyst add steam under pressure and a catalyst 1,2-dibromoethane is made ethanol is made What is P? A ethane B ethanoic acid C ethene D …
- Question 39
Proteins and starch are natural polymers. Which row identifies the method of polymerisation of proteins and starch? proteins starch A addition addition B condensation condensation C addition condensation D condensation addition
- Question 40
The diagram shows the partial structure of Terylene. …
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