Cambridge IGCSE · 0620 · Paper 2 · Multiple choice (Extended)
Chemistry 0620/21 Oct/Nov 2020 past paper
Cambridge IGCSE Chemistry (0620) Paper 2 (Multiple choice (Extended)), variant 1, Oct/Nov 2020: 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
- 30
File names: 0620_w20_qp_21 · 0620_w20_ms_21
Grade thresholds for 0620/21 Oct/Nov 2020
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 |
|---|---|---|---|---|---|---|
| 30 | 26 | 22 | 19 | 16 | 14 | 12 |
Topics in this paper
Which syllabus chapters 0620/21 Oct/Nov 2020 tested, by marks. Each chapter links to every past-paper question on it.
Questions in 0620/21 Oct/Nov 2020
- Question 1
Which gas has the slowest rate of diffusion? …
- Question 2
A mixture of colourless amino acids is separated using chromatography. The solvent used is propanol. The chromatogram is sprayed with a locating agent. Which row describes the purpose of the propanol and the locating agent? purpose of propanol purpose of …
- Question 3
Which piece of apparatus can only measure a single fixed volume? A 250 cm3 beaker B 50 cm3 burette C 100 cm3 measuring cylinder D 25 cm3 pipette
- Question 4
In the chromatography experiment shown, which label represents the solvent front? …
- Question 5
The atomic structure of four particles are shown. electrons protons neutrons …
- Question 6
The arrangements of the electrons in two ions formed from elements X and Y are shown. …
- Question 7
Which diagram shows the outer shell electron arrangement in a molecule of methanol, CH3OH? …
- Question 8
Which statement about silicon dioxide, SiO2, is correct? A It conducts electricity because it contains free electrons. B It is a macromolecule with four oxygen atoms bonded to each silicon atom. C It is a simple covalent molecule. D Its …
- Question 9
Rubidium is in Group I of the Periodic Table and bromine is in Group VII. Rubidium reacts with bromine to form an ionic compound. Which row shows the electron change taking place for rubidium and the correct formula of the …
- Question 10
Which statement explains why graphite is used as a lubricant? A All bonds between the atoms are weak. B It conducts electricity. C It has a low melting point. D Layers in the structure can slide over each other.
- Question 11
Sodium carbonate reacts with sulfuric acid to form carbon dioxide, water and a sodium salt. An incomplete equation for the reaction is shown. Na2CO3 + H2SO4 CO2 …
- Question 12
The relative atomic mass of chlorine is 35.5. When calculating relative atomic mass, which particle is the mass of a chlorine atom compared to? A a neutron B a proton C an atom of carbon-12 D an atom of hydrogen-1
- Question 13
What is the empirical formula of an oxide of iron, formed by reacting 2.24 g of iron with 0.96 g of oxygen? A FeO B Fe2O C Fe2O3 D Fe3O4
- Question 14
Which reaction takes place at the cathode during the electrolysis of molten nickel(II) chloride? A Cl …
- Question 15
Sodium nitrate is added to water in a beaker and stirred until it dissolves. At the end of the experiment, the beaker feels cold. Which row describes the reaction? temperature of solution type of reaction A decreases endothermic B decreases …
- Question 16
Which substance does not require oxygen in order to produce energy? A coal B hydrogen C natural gas D 235U
- Question 17
Ethene reacts with hydrogen to form ethane. …
- Question 18
A sign displayed in a flour mill is shown. Explosion Hazard No Smoking No Open Flames DANGER Which statement explains why there is a danger of explosion in a flour mill? A Flour burns very quickly because it is a …
- Question 19
A student investigates the effect of concentration on the rate of reaction between calcium carbonate and hydrochloric acid. He follows the method shown. ● Place 1 g of calcium carbonate in a conical flask. ● Add excess hydrochloric acid. ● …
- Question 20
The reaction between sulfur dioxide and oxygen is shown. 2SO2(g) + O2(g) 2SO3(g) The reaction is exothermic. Which of the changes shifts the position of equilibrium to the right? 1 Increase the concentration of oxygen. 2 Increase the pressure. 3 …
- Question 21
The reaction between chlorine and bromide ions is a redox reaction. Cl 2 + 2Br – 2Cl – + Br2 What is the change in oxidation state of the reducing agent in this reaction? A –2 to …
- Question 22
What is a characteristic of acids? A Acids turn methyl orange indicator yellow. B Acids have a high pH value. C Acids react with ammonium salts to give ammonia gas. D Acids react with carbonates to produce salts.
- Question 23
Zinc oxide is an amphoteric oxide. Which row describes the reactions of zinc oxide? reaction with alkalis reaction with acids …
- Question 24
A student carries out an experiment to prepare pure magnesium sulfate crystals. The diagram shows the first stage of the preparation. dilute sulfuric acid stirrer magnesium carbonate He adds magnesium carbonate until no more reacts. Which process should he use …
- Question 25
Elements P and Q have the same number of electron shells. Q has more electrons in its outer shell than P. Which statements are correct? 1 P and Q are in the same group of the Periodic Table. 2 P …
- Question 26
The positions of four elements in the Periodic Table are shown. Which element is a gas that displaces iodine from sodium iodide? …
- Question 27
A flammable gas needs to be removed from a tank at an industrial plant. For safety reasons, an inert gas is used. Which gas is suitable? A argon B hydrogen C methane D oxygen
- Question 28
A strip of aluminium is placed into a test-tube containing aqueous lead(II) nitrate and left for several minutes. Aluminium is higher than lead in the reactivity series. Pb(NO3)2 solution strip of aluminium no change Which statement explains why lead is …
- Question 29
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 30
What is the symbol of the metal used in the manufacture of aircraft because of its strength and low density? A Al B Cu C Fe D Zn
- Question 31
Ammonia is manufactured using the Haber process. Which statement about this process is correct? A The catalyst used for this reaction is vanadium pentoxide. B The hydrogen used is extracted from air. C Using a high pressure increases the yield …
- Question 32
Iron can be protected from rusting by attaching a piece of a more reactive metal, e.g. magnesium, to the iron. Which equation represents the reaction that takes place? A Fe(s) Fe2+(aq) …
- Question 33
Which row describes two uses of sulfur dioxide? use 1 use 2 A bleaching paper pulp neutralising acidic industrial waste B bleaching paper pulp preserving food and drink C extracting iron from hematite neutralising acidic industrial waste D extracting iron …
- Question 34
Part of the carbon cycle is shown. glucose combustion P Q CO2 R plant CH4 What are processes P, Q and …
- Question 35
The structures of four organic molecules are shown. …
- Question 36
Which chemical equation for the substitution of an alkane with chlorine is correct? …
- Question 37
Propene is an alkene that reacts with bromine, steam and hydrogen as shown. …
- Question 38
The flow chart shows the preparation of ethanol and some important chemistry of ethanol. ethanol carbon dioxide + substance Z substance X process Y fermentation What are X, Y and …
- Question 39
Which statements about aqueous ethanoic acid are correct? 1 It is an alkane. 2 It reacts with sodium carbonate to form carbon dioxide. 3 It changes the colour of litmus solution from blue to red. 4 It is a hydrocarbon. …
- Question 40
The structure of a polymer is shown. …
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