Cambridge IGCSE · 0620 · Paper 2 · Multiple choice (Extended)
Chemistry 0620/21 Oct/Nov 2019 past paper
Cambridge IGCSE Chemistry (0620) Paper 2 (Multiple choice (Extended)), variant 1, Oct/Nov 2019: the question paper and its official mark scheme, 40 questions, with the grade thresholds. Free to open, no account needed.
- Questions
- 40
- Marks
- 40
- Grade A from
- 30
File names: 0620_w19_qp_21 · 0620_w19_ms_21
Grade thresholds for 0620/21 Oct/Nov 2019
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 | 25 | 20 | 18 | 15 | 13 | 11 |
Topics in this paper
Which syllabus chapters 0620/21 Oct/Nov 2019 tested, by marks. Each chapter links to every past-paper question on it.
Questions in 0620/21 Oct/Nov 2019
- Question 1
Samples of four gases are released in a room at the same time. The gases are carbon dioxide, CO2, hydrogen chloride, HCl, hydrogen sulfide, H2S, and nitrogen dioxide, NO2. Which gas diffuses fastest? A carbon dioxide B hydrogen chloride C …
- Question 2
A student is asked to measure the time taken for 0.4 g of magnesium carbonate to react completely with 25.0 cm3 of dilute hydrochloric acid. Which pieces of apparatus does the student need? A balance, stop-clock, pipette B balance, stop-clock, …
- Question 3
Four different food colourings are analysed using chromatography. The results are shown on the chromatogram. The diagram is not drawn to scale. Which food colouring contains a component with an Rf value of 0.3? 10 cm 8 cm 6 cm …
- Question 4
Which statement about an ionic compound is not correct? A It conducts electricity when dissolved in water. B It has a high melting point due to strong attractive forces between ions. C It has a regular lattice of oppositely charged …
- Question 5
An isotope of chromium is represented by Cr …
- Question 6
- Question 7
How are the structures of diamond and silicon(IV) oxide similar? A Molecules of both diamond and silicon(IV) oxide are held together by weak attractive forces. B They both contain atoms arranged in planes held together by weak bonds. C They …
- Question 8
Which statement describes the structure of copper? A It has a lattice of negative ions in a ‘sea of electrons’. B It has a lattice of negative ions in a ‘sea of protons’. C It has a lattice of positive …
- Question 9
Four fertilisers are each supplied in 100 kg bags. Which fertiliser supplies the greatest mass of nitrogen per 100 kg bag? A ammonium nitrate, NH4NO3 B ammonium phosphate, (NH4)3PO4 C ammonium sulfate, (NH4)2SO4 D urea, CO(NH2)2
- Question 10
Calcium carbonate reacts with dilute hydrochloric acid. The equation for the reaction is shown. CaCO3 + 2HCl → CaCl …
- Question 11
Which rows correctly show cathode and anode products from the electrolysis of the named electrolyte? electrolyte cathode product anode product 1 copper(II) sulfate solution using copper electrodes copper oxygen 2 molten lead(II) bromide lead bromine 3 dilute sodium bromide solution …
- Question 12
What are the ionic half-equations for the electrode reactions during the electrolysis of concentrated aqueous sodium chloride? anode cathode A Cl …
- Question 13
Which statements about endothermic reactions are correct? 1 The energy of the products is greater than the energy of the reactants. 2 The energy of the reactants is greater than the energy of the products. 3 The temperature of the …
- Question 14
Which gases are used to generate electricity in a fuel cell? A carbon dioxide and oxygen B hydrogen and methane C hydrogen and oxygen D methane and carbon dioxide
- Question 15
Which is a chemical change? A boiling water B cooking an egg C dissolving sugar D melting ice cubes
- Question 16
The rate of reaction between magnesium and dilute hydrochloric acid is increased by increasing the concentration of the acid. How does this affect the reacting particles? collision rate of particles proportion of particles with sufficient energy to react A increases …
- Question 17
Dinitrogen tetroxide, N2O4, is converted into nitrogen dioxide, NO2, in a reversible reaction. N2O4(g) 2NO2(g) The forward reaction is endothermic. Which conditions give the highest equilibrium yield of nitrogen dioxide? pressure / atmospheres temperature A 2 high B 2 low …
- Question 18
The equation for the reaction between iron(II) sulfate and bromine is shown. 6FeSO4 + 3Br2 → 2Fe2(SO4)3 + 2FeBr3 Which row identifies the oxidising agent and the reducing agent? oxidising agent reducing agent A Br2 FeSO4 B FeSO4 Br2 C …
- Question 19
Which statement about amphoteric oxides is correct? A They are made by combining an acidic oxide with a basic oxide. B They react with water to give a solution of pH 7. C They react with both acids and bases. …
- Question 20
Carbonic acid is a weak acid formed when carbon dioxide dissolves in water. What is the pH of the solution? …
- Question 21
A method used to make copper(II) sulfate crystals is shown. 1 Place dilute sulfuric acid in a beaker. 2 Warm the acid. 3 Add copper(II) oxide until it is in excess. 4 Filter the mixture. 5 Evaporate the filtrate until …
- Question 22
Lead(II) sulfate is an insoluble salt. Which process is not used to prepare a pure sample of this salt? A crystallisation B drying C filtration D precipitation
- Question 23
Part of the Periodic Table is shown. Which element is used to provide an inert atmosphere? …
- Question 24
Which pair of elements reacts together most violently? A chlorine and lithium B chlorine and potassium C iodine and lithium D iodine and potassium
- Question 25
Which pair of compounds shows that transition elements have variable oxidation states? A Cr2O3 and CrBr3 B CuSO4 and CuCl 2 C Fe2O3 and FeCl 2 D NiO and NiCl 2
- Question 26
Some properties of substance X are listed. ● It conducts electricity when molten. ● It has a high melting point. ● It burns in oxygen and the oxide dissolves in water to give a solution with pH 11. What is …
- Question 27
Which statement is correct? A Aluminium is used in the manufacture of aircraft because it has a high density. B Copper is used for cooking utensils because it is a good conductor of heat. C Mild steel is used for …
- Question 28
Iron rusts but aluminium does not easily corrode. Which statement explains why aluminium does not easily corrode? A It is an alloy. B It is below iron in the reactivity series. C It is not a transition element. D Its …
- Question 29
Which statement about the extraction of aluminium is correct? A Aluminium is formed at the cathode during the electrolysis of aluminium oxide. B Hematite is mainly aluminium oxide. C Molten cryolite is used to raise the melting point of the …
- Question 30
River water contains soluble impurities, insoluble impurities and bacteria. River water is made safe to drink by filtration and chlorination. Which statement is correct? A Filtration removes bacteria and insoluble impurities, and chlorination removes soluble impurities. B Filtration removes insoluble …
- Question 31
Which physical property is used to separate the nitrogen and oxygen from air? A boiling point B density C electrical conductivity D molecular mass
- Question 32
The apparatus shown is set up and left for a week. damp iron wool air water Which diagram shows the level of the water at the end of the week? …
- Question 33
Which statement about the carbon cycle is correct? A Carbon is absorbed from the atmosphere by combustion and released into it by respiration. B Carbon is absorbed from the atmosphere by photosynthesis and released into it by combustion. C Carbon …
- Question 34
Ammonium sulfate is used as a fertiliser. It is made from ammonia and sulfuric acid. Which words complete gaps 1, 2 and 3? The 1 is made by the 2 process in which 3 is used as a catalyst. …
- Question 35
Which process is used to obtain lime from limestone? A cracking B fractional distillation C neutralisation D thermal decomposition
- Question 36
Petroleum is separated by fractional distillation. Which statement about the fractions produced is correct? A Bottled gas for heating and cooking is obtained from the naphtha fraction. B Diesel oil is used as a fuel for jet aircraft. C Substances …
- Question 37
Which products are obtained by the cracking of an alkane? alkene hydrogen water …
- Question 38
Ethanol is manufactured by the catalytic addition of steam to ethene and by fermentation. Which statement describes an advantage of fermentation compared to the catalytic addition of steam to ethene? A Fermentation is a more rapid reaction. B Fermentation produces …
- Question 39
The diagram shows the structure of a monomer and of the polymer made from it. …
- Question 40
Which polymers possess the same linkage? A nylon and protein B protein and starch C starch and nylon D nylon and Terylene Group The Periodic Table of Elements 1 H hydrogen 1 2 He helium 4 I II III IV …
Other Chemistry papers from Oct/Nov 2019
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- 0620/61 Alternative to Practical
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