Cambridge IGCSE · 0620 · Paper 2 · Multiple choice (Extended)
Chemistry 0620/21 May/June 2018 past paper
Cambridge IGCSE Chemistry (0620) Paper 2 (Multiple choice (Extended)), variant 1, 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_21 · 0620_s18_ms_21
Grade thresholds for 0620/21 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 | 23 | 19 | 16 | 14 | 12 | 10 |
Topics in this paper
Which syllabus chapters 0620/21 May/June 2018 tested, by marks. Each chapter links to every past-paper question on it.
Questions in 0620/21 May/June 2018
- Question 1
A student investigated the diffusion of ammonia gas, NH3, and hydrogen chloride gas, HCl. Two sets of apparatus were set up as shown at room temperature and pressure. apparatus 1 source of ammonia gas damp red litmus paper apparatus 2 …
- Question 2
Chromatography is a technique used to separate coloured dyes. Which dye has an Rf value of 0.7? solvent front baseline A B dyes C D
- Question 3
Which piece of apparatus is used to measure exactly 26.3 cm3 of a liquid? …
- 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
Chlorine exists as two common isotopes, 35Cl and 37Cl. Information about these two isotopes is shown. number of protons number of neutrons number of electron shells 35Cl …
- Question 6
Which substance is not a macromolecule? A diamond B graphite C silicon(IV) oxide D sulfur
- Question 7
Copper is a metallic element. Which statements about copper are correct? 1 Copper is malleable because layers of ions are in fixed positions and cannot move. 2 The structure of copper consists of negative ions in a lattice. 3 Copper …
- Question 8
The equation for the combustion of ethane is shown. …
- Question 9
A solution of ethanoic acid, CH3COOH, has a concentration of 2 mol / dm3. Which statement about this solution is correct? …
- Question 10
Aqueous copper(II) sulfate is electrolysed using copper electrodes. Which statement is correct? A A reduction reaction occurs at the positive electrode. B The blue colour of the solution becomes darker. C The concentration of copper ions in the solution decreases. …
- 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
Plant cells use energy from sunlight for photosynthesis. Which row describes and explains the energy change that occurs? type of energy change explanation A endothermic less energy is released making bonds than is absorbed to break bonds B endothermic more …
- Question 13
Hydrogen bromide decomposes to form hydrogen and bromine. The equation is shown. 2HBr(g) …
- 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
The formation of sulfur trioxide is a reversible reaction. The equation is shown. 2SO2(g) + O2(g) 2SO3(g) The forward reaction is exothermic. Which conditions produce the highest equilibrium yield of sulfur trioxide? pressure temperature A high high B high low …
- Question 16
Chlorine displaces iodide ions from potassium iodide. Cl …
- Question 17
Which statement about oxides is correct? A A solution of magnesium oxide has a pH less than pH …
- Question 18
Which solution has the lowest pH? A 0.1 mol / dm3 ammonia solution B 0.1 mol / dm3 ethanoic acid C 0.1 mol / dm3 lithium hydroxide D 0.1 mol / dm3 nitric acid
- Question 19
A student mixes silver nitrate and barium chloride to form a white precipitate of silver chloride. The equation is shown. 2AgNO3 + BaCl 2 → 2AgCl + Ba(NO3)2 Which row describes the solubility of the salts? soluble insoluble A silver …
- 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 in the same period of the Periodic Table as silicon? A germanium B scandium C sodium D strontium
- Question 22
Which statement about the halogens is correct? A A sample of bromine reacts with potassium chloride solution. B A sample of bromine reacts with potassium iodide solution. C A sample of chlorine has a higher density than a sample of …
- Question 23
Which row shows the catalytic activity of transition elements and their compounds? catalytic activity of transition elements catalytic activity of compounds of transition elements A good good B good poor C poor good D poor poor
- Question 24
The following statements are made about the metals copper, iron, magnesium and zinc. 1 Their oxides are acidic. 2 They all conduct electricity in the solid state. 3 They all have high melting points. 4 They all react with dilute …
- Question 25
Silver is a less reactive metal than cadmium. Cadmium is a less reactive metal than barium. Which statement is correct? A Barium does not react when heated with silver oxide. B Cadmium displaces barium from a solution of barium chloride. …
- Question 26
Aluminium metal is extracted from aluminium oxide using electrolysis. Which statement about the extraction process is not correct? A A large amount of electricity is required. B Molten cryolite is used to dissolve the aluminium oxide. C Oxygen gas is …
- Question 27
Which statement explains why aluminium is used in the manufacture of aircraft? A It conducts heat well. B It has a low density. C It is a good conductor of electricity. D It is easy to recycle.
- 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
Which statement about sulfur and its compounds is not correct? A Sulfur dioxide is used as a food preservative. B Sulfur dioxide turns acidified aqueous potassium manganate(VII) from purple to colourless. C Sulfur forms a basic oxide. D Sulfur is …
- Question 34
Which process is used to convert limestone (calcium carbonate) into lime? A electrolysis B fractional distillation C incomplete combustion D thermal decomposition
- 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
Which reaction is not a reaction which alkenes undergo? A bromination B hydration C hydrogenation D hydrolysis
- 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
Ethanol is produced by fermentation or from ethene. What is a disadvantage of producing ethanol by fermentation? A Distillation is needed to purify the ethanol produced. B Fermentation uses glucose from plants. C Fermentation is catalysed by enzymes in yeast. …
- Question 39
Which structural formula represents methyl propanoate? A CH3CH2COOCH3 B CH3COOCH2CH2CH3 C CH3CH2CH2COOCH3 D HCOOCH2CH2CH3
- Question 40
Which row describes addition polymerisation and condensation polymerisation? addition polymerisation condensation polymerisation A monomers have a C=C double bond and the polymer is the only product monomers have a C=C double bond and the polymer is the only product B …
Other Chemistry papers from May/June 2018
- 0620/11 Multiple choice (Core)
- 0620/12 Multiple choice (Core)
- 0620/13 Multiple choice (Core)
- 0620/22 Multiple choice (Extended)
- 0620/23 Multiple choice (Extended)
- 0620/31 Theory (Core)
- 0620/32 Theory (Core)
- 0620/33 Theory (Core)
- 0620/41 Theory (Extended)
- 0620/42 Theory (Extended)
- 0620/43 Theory (Extended)
- 0620/61 Alternative to Practical
- 0620/62 Alternative to Practical
- 0620/63 Alternative to Practical