Cambridge IGCSE · 0620 · Paper 2 · Multiple choice (Extended)
Chemistry 0620/21 May/June 2023 past paper
Cambridge IGCSE Chemistry (0620) Paper 2 (Multiple choice (Extended)), variant 1, May/June 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_s23_qp_21 · 0620_s23_ms_21
Grade thresholds for 0620/21 May/June 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 | 17 | 15 | 13 | 12 | 11 |
Topics in this paper
Which syllabus chapters 0620/21 May/June 2023 tested, by marks. Each chapter links to every past-paper question on it.
Questions in 0620/21 May/June 2023
- Question 1
The diagram shows the result of dropping a purple crystal into water. water purple crystal after five hours purple solution Which processes take place in this experiment? chemical reaction diffusing dissolving …
- Question 2
Which row about elements, mixtures and compounds is correct? metallic element non-metallic element mixture compound A copper methane brass sulfur B brass sulfur copper methane C copper sulfur brass methane D brass methane copper sulfur
- Question 3
The atomic structures of four particles, …
- Question 4
Which statement explains why isotopes of the same element have the same chemical properties? A They have the same number of outer shell electrons. B They have the same number of neutrons. C They have different numbers of protons. D …
- Question 5
Nitrogen forms a nitride ion with the formula N3–. Which particle does not have the same electronic configuration as the nitride ion? A Al 3+ B Cl – C Na+ D O2–
- Question 6
Which row describes the formation of single covalent bonds in methane? A atoms share a pair of electrons both atoms gain a noble gas electronic structure B atoms share a pair of electrons both atoms have the same number of …
- Question 7
Which formula is an empirical formula? …
- Question 8
Heating iron sulfide, FeS2, in air produces sulfur dioxide. 4FeS2 …
- Question 9
Which substance produces hydrogen and bromine when electrolysed? A concentrated aqueous copper(II) bromide B concentrated aqueous sodium bromide C dilute aqueous potassium bromide D molten lead(II) bromide
- Question 10
Which statements about hydrogen fuel cells are correct? 1 Water is formed as the only waste product. 2 Both water and carbon dioxide are formed as waste products. 3 The overall reaction is …
- Question 11
Ethene gas, C2H4, is completely burned in excess oxygen to form carbon dioxide and water. The equation for this exothermic reaction is shown. …
- Question 12
Which row describes the effect on the activation energy and the frequency of particle collisions when the temperature of a chemical reaction is increased? activation energy frequency of collisions A increases increases B no change increases C increases no change …
- Question 13
Solid copper(II) sulfate exists in two different forms, anhydrous and hydrated. One of these forms is blue and the other is white. The change between these two forms is reversible. blue form white form What is the blue form and …
- Question 14
Sodium ions, Na+, and oxygen ions, O2–, combine with chromium ions to form a salt. The salt sodium dichromate has the formula Na2Cr2O7. What is the oxidation state of chromium in this salt? …
- Question 15
The concentration of hydrogen ions in 100 cm3 of 0.1 mol / dm3 hydrochloric acid is higher than the concentration of hydrogen ions in 100 cm3 of 0.1 mol / dm3 ethanoic acid. Which statement explains the difference in hydrogen …
- Question 16
Which oxide is classified as an amphoteric oxide? A aluminium oxide B calcium oxide C copper(II) oxide D nitrogen oxide
- Question 17
Which method produces the salt copper(II) carbonate? A Add copper(II) oxide to water, then add excess aqueous sodium carbonate. Filter off the precipitate. B Add copper(II) oxide to dilute sulfuric acid, then add excess aqueous sodium carbonate. Filter off the …
- Question 18
Which statements about the trends across a period of the Periodic Table are correct? 1 Aluminium is more metallic than sodium. 2 Beryllium is more metallic than carbon. 3 Boron is more metallic than lithium. 4 Magnesium is more metallic …
- Question 19
Some information about elements in Group II of the Periodic Table is shown. element time taken to make 10 cm3 of hydrogen gas when 1 g of metal is added to cold water density in g / cm3 melting point …
- Question 20
A new element oxfordium, Ox, was discovered with the following properties. solubility electrical conduction formula of element bonding in a molecule of Ox2 insoluble in water does not conduct Ox2 Ox Ox In which group of the Periodic Table should …
- Question 21
Which row describes a similarity and a difference between chlorine and bromine? similarity difference A both are gases at room temperature and pressure chlorine and bromine have different colours B both exist as diatomic molecules chlorine is more dense than …
- Question 22
Which statement describes transition elements? A They have high densities and high melting points. B They have high densities and low melting points. C They have low densities and high melting points. D They have low densities and low melting …
- Question 23
Which gas is made when powdered zinc is added to dilute hydrochloric acid? A carbon dioxide B chlorine C hydrogen D oxygen
- Question 24
The diagram represents the structure of a solid. Which solids does the diagram represent? brass graphite sodium chloride …
- Question 25
Steel is an alloy of iron. Which statement explains why steel is stronger than iron? A Steel contains carbon which is a very hard substance. B The carbon atoms in steel bond together very strongly. C The carbon atoms in …
- Question 26
Three students, X, Y and Z, are told that solid P reacts with dilute acids and also conducts electricity. The table shows the students’ suggestions about the identity of …
- Question 27
Which statement explains why aluminium appears to be unreactive? A It is coated in an oxide layer. B It has a low density. C It is low in the reactivity series. D It is solid at room temperature.
- Question 28
During the electrolysis of aluminium oxide, the mass of the carbon anode changes. Which row describes the change and gives a reason for this change? mass change of the anode reason A decreases carbon reacts to form carbon dioxide B …
- Question 29
Several processes are used to treat domestic water. Which row identifies a reason for the given process? process reason A chlorination removes impurities B filtration removes insoluble solids C sedimentation removes soluble solids D use of carbon kills bacteria
- Question 30
What is the equation for photosynthesis? A CO2 …
- Question 31
Which statement describes how the C–H bonds in methane gas in the atmosphere contribute to global warming? A They absorb thermal energy from the Sun and emit some of this energy into space. B They absorb thermal energy from the …
- Question 32
The structural formulae of two hydrocarbons are shown. CH3CH2CH2CH3 CH3CH(CH3)CH3 Which statement about the hydrocarbons is correct? A They are both alkenes. B They decolourise aqueous bromine. C They are structural isomers. D They undergo addition reactions.
- Question 33
The structural formula of compound Q is given. CH3CH2CH2COOCH2CH2CH3 What is compound Q? A butyl butanoate B butyl propanoate C propyl butanoate D propyl propanoate
- Question 34
The fractional distillation of petroleum is shown. Which fraction contains hydrocarbons with the longest chain length? A fuel gas bitumen …
- Question 35
Which equation represents the cracking of an alkane? …
- Question 36
What is the structure of the product of the reaction of propene with bromine? …
- Question 37
In reaction R, 2000 molecules of CH2=CH2 react to form a single molecule X only. 2000 CH2=CH2 → X Which terms describe reaction R, CH2=CH2 and X? reaction R CH2=CH2 X A addition monomer polymer B addition polymer monomer C …
- Question 38
Part of the structure of a polymer is shown. …
- Question 39
The concentration of acids and alkalis can be determined by titration. Which pieces of equipment are needed to perform a titration? …
- Question 40
Which chromatogram shows how the Rf value of a substance is calculated? …
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