Cambridge IGCSE · 0620 · Paper 2 · Multiple choice (Extended)
Chemistry 0620/23 May/June 2018 past paper
Cambridge IGCSE Chemistry (0620) Paper 2 (Multiple choice (Extended)), variant 3, May/June 2018: 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
- 27
File names: 0620_s18_qp_23 · 0620_s18_ms_23
Grade thresholds for 0620/23 May/June 2018
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 | 18 | 16 | 14 | 12 | 10 |
Topics in this paper
Which syllabus chapters 0620/23 May/June 2018 tested, by marks. Each chapter links to every past-paper question on it.
Questions in 0620/23 May/June 2018
- Question 1
Ammonia gas is reacted with hydrogen chloride gas using the apparatus shown. Solid ammonium chloride is produced. cotton wool soaked in ammonia solution cotton wool soaked in hydrogen chloride solution long glass tube solid ammonium chloride Which statement explains why …
- Question 2
Paper chromatography is done in the same way with three different mixtures of dyes. Each mixture contains at least one of the dyes …
- Question 3
Solid R reacted with dilute sulfuric acid. The initial temperature of the dilute sulfuric acid and the final temperature of the solution are shown. …
- Question 4
The ‘lead’ in a pencil is made of a mixture of graphite and clay. ‘lead’ When the percentage of graphite is increased, the pencil slides across the paper more easily. Which statement explains this observation? A Graphite has a high …
- Question 5
Iron has an atomic number of 26. It occurs as the isotopes 54Fe, 56Fe, 57Fe and 58Fe. Which statement explains why these isotopes have the same chemical properties? A They have similar mass numbers. B They have the same number …
- Question 6
How many silicon atoms are bonded to each oxygen atom in a crystal of silicon(IV) oxide? …
- Question 7
Which substance is not a macromolecule? A diamond B graphite C silicon(IV) oxide D sulfur
- Question 8
An experiment was done to determine the formula of a hydrocarbon, CxHy. 10 cm3 of the gaseous hydrocarbon, CxHy, was burned in an excess of oxygen to form 20 cm3 of carbon dioxide and 30 cm3 of water vapour. What …
- Question 9
4.00 g of solid sodium hydroxide is added to water to make a solution with a concentration of 0.200 mol / dm3. What is the volume of water used? A 0.5 cm3 B 20 cm3 C 500 cm3 D 2000 …
- Question 10
Aqueous copper(II) sulfate is electrolysed using copper electrodes. Which statement is correct? A Oxygen gas is produced at the positive electrode. B The blue colour of the solution gradually fades. C The concentration of copper ions in the solution stays …
- Question 11
Dilute sulfuric acid is electrolysed using inert electrodes. What are the ionic half-equations for the reactions that take place at each electrode? positive electrode negative electrode …
- Question 12
Information about two reactions is given. • The neutralisation reaction between citric acid and sodium hydrogencarbonate is endothermic. • The displacement reaction between magnesium and carbon dioxide is exothermic. Which statements about the two reactions are correct? 1 The energy …
- Question 13
Ethene reacts with hydrogen. The equation is shown. CH2=CH2 …
- Question 14
Which row describes the effects of increasing both concentration and temperature on the collisions between reacting particles? increasing concentration increasing temperature A more collisions per second only more collisions per second only B more collisions per second and more collisions …
- Question 15
In the Contact process, sulfur dioxide is converted into sulfur trioxide in a reversible reaction. 2SO2(g) + O2(g) 2SO3(g) The forward reaction is exothermic. Which conditions give the highest yield of sulfur trioxide at equilibrium? pressure / atmospheres temperature A …
- Question 16
The equation for a redox reaction is shown. 2Fe3+ + Zn → 2Fe2+ + Zn2+ Which statements are correct? 1 Fe3+ is reduced to form Fe2+. 2 Zn oxidises the Fe3+ ions. 3 Fe3+ is an oxidising agent. …
- Question 17
Which statement about oxides is correct? A A solution of magnesium oxide has a pH less than pH …
- Question 18
The equation represents an equilibrium in aqueous ammonia. NH3(aq) + H2O(l) NH4 +(aq) + OH–(aq) How does aqueous ammonia behave in this reaction? A as a strong acid B as a strong base C as a weak acid D as …
- Question 19
An excess of aqueous sodium sulfate was added to aqueous barium chloride and the mixture was filtered. Which row shows the identity of the residue and the substances present in the filtrate? residue substances in filtrate A barium sulfate barium …
- Question 20
Which methods are suitable for preparing both zinc sulfate and copper(II) sulfate? 1 reacting the metal oxide with warm dilute aqueous sulfuric acid 2 reacting the metal with dilute aqueous sulfuric acid 3 reacting the metal carbonate with dilute aqueous …
- Question 21
Which element is classified as a non-metal in the Periodic Table? A calcium B chlorine C chromium D copper
- Question 22
Part of the Periodic Table is shown. Element Q has a low boiling point, low density and does not conduct electricity. Which element is …
- Question 23
Which row describes a typical transition element? density in g / cm3 melting point in °C boiling point in °C colour of oxide …
- Question 24
Which diagram represents a solid alloy? …
- Question 25
The ionic equations for four reactions are shown. …
- Question 26
Which equation represents the first stage in the extraction of zinc from zinc blende? A 2ZnS …
- Question 27
Which statement explains why aluminium is used to manufacture aircraft? A It has a low density. B It is a good conductor of electricity. C It is a good conductor of heat. D It is ductile.
- Question 28
Dry air is passed over hot copper until all the oxygen has reacted. heat copper dry air The volume of gas at the end of the reaction is 120 cm3. What is the starting volume of dry air? A 132 …
- Question 29
A steel bicycle which had been left outdoors for several months was starting to rust. What would not reduce the rate of corrosion? A Remove the rust and paint the bicycle. B Remove the rust and store the bicycle in …
- Question 30
Which statements about water are correct? 1 Household water contains dissolved salts. 2 Water for household use is filtered to remove soluble impurities. 3 Water is treated with chlorine to kill bacteria. 4 Water is used in industry for cooling. …
- Question 31
Ammonia is manufactured by reacting hydrogen with nitrogen in the Haber process. Which row describes the sources of hydrogen and nitrogen and the conditions used in the manufacture of ammonia in the Haber process? source of hydrogen source of nitrogen …
- Question 32
Which statements about the carbon cycle are correct? 1 Carbon dioxide is added to the atmosphere by respiration. 2 Carbon dioxide is added to the atmosphere by combustion of coal. 3 Carbon dioxide is removed from the atmosphere by photosynthesis. …
- Question 33
Element Z forms an oxide, ZO2. Three uses of ZO2 are listed. ● bleaching agent ● killing bacteria ● manufacturing an important acid What is Z? A carbon B lead C nitrogen D sulfur
- Question 34
Limestone is an important material with many uses. Limestone is heated to produce 1 and carbon dioxide. This reaction is called 2 . Which words correctly complete gaps 1 and …
- Question 35
What is not the correct use of the fraction named? name of fraction use A fuel oil making waxes B gas oil fuel in diesel engines C kerosene jet fuel D naphtha making chemicals
- Question 36
Methane, ethane and propane belong to a family of hydrocarbons called alkanes. What is the general formula of an alkane? A CnH2n B CnH2n+1 C CnH2n–1 D CnH2n+2
- Question 37
Which substances can be obtained by cracking hydrocarbons? A ethanol and ethene B ethanol and hydrogen C ethene and hydrogen D ethene and poly(ethene)
- Question 38
Which row describes an advantage and a disadvantage of making ethanol by fermentation? advantage disadvantage A uses a renewable resource occurs at a slow rate B needs a high temperature produces impure ethanol as a product C produces pure ethanol …
- Question 39
Which esters have the molecular formula C5H10O2? 1 ethyl propanoate 2 propyl ethanoate 3 butyl methanoate 4 methyl butanoate …
- Question 40
A polymer linkage contains carbon, hydrogen, nitrogen and oxygen atoms. Which row about the polymer is correct? type of polymer formed by A polyamide addition polymerisation B polyamide condensation polymerisation C polyester addition polymerisation D polyester condensation polymerisation Group The …
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