Cambridge IGCSE · 0620 · Paper 2 · Multiple choice (Extended)
Chemistry 0620/23 Oct/Nov 2019 past paper
Cambridge IGCSE Chemistry (0620) Paper 2 (Multiple choice (Extended)), variant 3, 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_23 · 0620_w19_ms_23
Grade thresholds for 0620/23 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 | 27 | 22 | 19 | 16 | 14 | 12 |
Topics in this paper
Which syllabus chapters 0620/23 Oct/Nov 2019 tested, by marks. Each chapter links to every past-paper question on it.
Questions in 0620/23 Oct/Nov 2019
- Question 1
Which two gases will diffuse at the same rate, at the same temperature? A carbon monoxide and carbon dioxide B carbon monoxide and nitrogen C chlorine and fluorine D nitrogen and oxygen
- 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
A substance is separated using chromatography. The chromatogram is shown. …
- 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
The numbers of protons, neutrons and electrons present in the atoms …
- Question 6
Carbon has three isotopes, 12C, 13C and 14C. Why do all three isotopes have the same chemical properties? A They all have the same atomic mass. B They all have the same number of electrons in their outer shell. C …
- Question 7
Silicon(IV) oxide is a covalently bonded compound. Which statements are correct? 1 Silicon atoms form four single bonds in silicon(IV) oxide. 2 Oxygen atoms form two double bonds in silicon(IV) oxide. 3 Silicon(IV) oxide has a high melting point. 4 …
- 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
Magnesium carbonate decomposes on heating to form magnesium oxide and carbon dioxide as shown. MgCO3 → MgO + CO2 How much magnesium carbonate is needed to make 5.0 g of magnesium oxide? …
- Question 10
90 g of glucose is dissolved in water. The glucose solution is fermented. C6H12O6 → 2CO2 + 2C2H5OH glucose, Mr = 180 ethanol, Mr = 46 After the fermentation finishes, 6.8 g of ethanol is obtained from the solution. What …
- Question 11
The diagram shows a simple cell. dilute sulfuric acid copper metal P wire voltmeter Which metal P produces the smallest voltage? A calcium B iron C magnesium D zinc
- 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
An energy level diagram for a reaction is shown. energy progress of reaction Which statement and explanation about this reaction are correct? statement explanation A the reaction is endothermic the products have more energy than the reactants B the reaction …
- 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
A sequence of changes involving sulfur is shown. S(s) change 1 S(l) SO2(g) change 2 Which row describes the changes? change 1 change 2 A chemical chemical B chemical physical C physical chemical D physical physical
- Question 16
Magnesium reacts with dilute hydrochloric acid. Which statement about the particles in the reaction is correct? A Increasing the concentration of dilute hydrochloric acid increases the collision rate but has no effect on the activation energy. B Increasing the concentration …
- Question 17
Two molecules of nitrogen dioxide combine in a reversible reaction to form dinitrogen tetroxide. The forward reaction is exothermic. 2NO2(g) N2O4(g) Which changes in reaction conditions would both increase the amount of dinitrogen tetroxide at equilibrium? A decreasing the temperature …
- Question 18
Chlorine displaces bromine from aqueous potassium bromide. The ionic equation for the reaction is shown. Cl 2 + 2Br– → 2Cl – + Br2 Which statement about this reaction is correct? A Bromide ions act as an oxidising agent. B …
- Question 19
Which substance is a neutral oxide? A aluminium oxide B carbon monoxide C sulfur dioxide D zinc oxide
- Question 20
Which statements about dilute sulfuric acid are correct? 1 It turns red litmus paper blue. 2 It reacts with magnesium(II) oxide to form magnesium(II) sulfate and water. 3 It reacts with magnesium to form magnesium(II) sulfate and carbon dioxide. 4 …
- 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) iodide is formed as a precipitate in the reaction shown. Pb(NO3)2(aq) + 2NaI(aq) → PbI2(s) + 2NaNO3(aq) Which method is used to separate the lead(II) iodide from the mixture? A crystallisation B distillation C evaporation D filtration
- Question 23
Which statement describes a gas which is in Group VIII of the Periodic Table? A A colourless gas that helps substances burn. B A pollutant gas present in car exhausts. C A gas that is less dense than air and …
- 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
Iron reacts with dilute hydrochloric acid to form iron(II) chloride, FeCl 2. Iron reacts with chlorine to form iron(III) chloride, FeCl 3. Which property of transition elements is shown by this information? A Transition elements have high melting points. B …
- 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 about metals and their uses is correct? A Aluminium is used in the manufacture of aircraft because it has a high density. B Copper is used to make cooking utensils because it is a poor conductor of heat. …
- Question 28
Which word equation represents a reaction which occurs? A sodium oxide + carbon → sodium + carbon dioxide B sodium oxide + iron → sodium + iron(II) oxide C iron(II) oxide + copper → iron + copper(II) oxide D iron(III) …
- Question 29
Why is cryolite used in the extraction of aluminium by electrolysis? A It changes bauxite to aluminium oxide. B It decreases the melting point of the aluminium. C It dissolves the aluminium oxide. D It protects the anodes from corrosion.
- 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
How are oxygen and nitrogen separated from air? A chromatography B condensation and filtration C crystallisation D fractional distillation
- 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
The following processes are part of the carbon cycle. 1 photosynthesis 2 combustion 3 respiration Which processes decrease the amount of carbon dioxide in the atmosphere? A 1 only B 1 and 2 only C 1 and 3 only D …
- 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 type of reaction occurs when lime is manufactured from limestone? A combustion B neutralisation C redox D thermal decomposition
- Question 36
Which statement is correct? A Bitumen is used as a fuel for ships. B Coal, natural gas and oxygen are all fuels. C Hydrogen is the main constituent of natural gas. D Petroleum is separated into useful substances by fractional …
- Question 37
Which products are obtained by the cracking of an alkane? alkene hydrogen water …
- Question 38
Ethanol is made by fermentation of sugars and by the catalytic addition of steam to ethene. What are two advantages of making ethanol by the catalytic addition of steam to ethene rather than by fermentation of sugars? A faster reaction …
- Question 39
The diagram shows the structure of a monomer and of the polymer made from it. …
- Question 40
Proteins and starch are both natural polymers. Both proteins and starch are hydrolysed by dilute acids. What are the products of hydrolysis of proteins and of starch? products of hydrolysis of proteins products of hydrolysis of starch A amines and …
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