Cambridge IGCSE · 0620 · Paper 2 · Multiple choice (Extended)
Chemistry 0620/23 Oct/Nov 2018 past paper
Cambridge IGCSE Chemistry (0620) Paper 2 (Multiple choice (Extended)), variant 3, Oct/Nov 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
- 29
File names: 0620_w18_qp_23 · 0620_w18_ms_23
Grade thresholds for 0620/23 Oct/Nov 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 |
|---|---|---|---|---|---|---|
| 29 | 25 | 22 | 19 | 16 | 14 | 12 |
Topics in this paper
Which syllabus chapters 0620/23 Oct/Nov 2018 tested, by marks. Each chapter links to every past-paper question on it.
Questions in 0620/23 Oct/Nov 2018
- Question 1
Gases are separated from liquid air by fractional distillation. The boiling points of four gases are shown. Which gas is both monatomic and a liquid at –200 °C? gas boiling point …
- Question 2
The diagrams show four pieces of laboratory equipment. thermometer stop-clock pipette balance Which equipment is essential to find out if dissolving a salt in water is an exothermic process? balance pipette stop-clock thermometer …
- Question 3
Which statement describes isotopes? A Isotopes of the same element have different electron arrangements. B Isotopes of the same element have different nuclear charges. C Isotopes of the same element have nuclei with masses that are the same. D Isotopes …
- Question 4
X and Y are both atoms. X and Y have the same chemical properties as each other. Which row describes the atomic structures of X and …
- Question 5
Which covalent molecule contains two atoms bonded together by exactly four shared electrons? …
- Question 6
The formula of ammonia is NH3. Which statement about a molecule of ammonia is correct? A The bonding in a molecule of ammonia is ionic. B The nitrogen atom has a noble gas configuration, the hydrogen atoms do not. C …
- Question 7
Which gas sample has the greatest mass? A 5.0 moles of Cl …
- Question 8
Which sample of magnesium chloride, MgCl 2, contains the same number of moles as 69.6 g of potassium sulfate, K2SO4? …
- Question 9
Iron(III) chromate is a yellow solid. It contains the ions Fe3+ and CrO4 2–. What is the formula of iron(III) chromate? A FeCrO4 B Fe3(CrO4)2 C Fe2CrO4 D Fe2(CrO4)3
- Question 10
Electrolysis of copper(II) sulfate can be done using either carbon electrodes or copper electrodes. Which statement describes what happens at the positive electrode? A Copper is deposited if the electrode is made from carbon. B Copper is deposited if the …
- Question 11
The diagram shows a circuit used to electrolyse aqueous copper(II) sulfate. …
- Question 12
Ethene burns in oxygen to form carbon dioxide and water vapour. …
- Question 13
The equation for the formation of ammonia is shown. …
- Question 14
Dilute hydrochloric acid reacts with 1 g of limestone. Which conditions produce the fastest rate of reaction? A 2 mol / dm3 hydrochloric acid and a single lump of limestone B 4 mol / dm3 hydrochloric acid and a single …
- Question 15
The reversible reaction between methane and steam is shown. CH4(g) + H2O(g) CO(g) + 3H2(g) The forward reaction is endothermic. Which changes in pressure and temperature move the equilibrium to the right? pressure temperature A decrease decrease B decrease increase …
- Question 16
The equation for the reaction between zinc and copper(II) oxide is shown. Zn + CuO → ZnO + Cu Which row shows the oxidising agent and the reducing agent? oxidising agent reducing agent A CuO Cu B CuO Zn C …
- Question 17
The results of some experiments with sulfur dioxide are shown. experiment description result 1 mix with dilute hydrochloric acid does not react 2 mix with concentrated sodium hydroxide a salt forms 3 add Universal Indicator Universal Indicator turns purple 4 …
- Question 18
A white precipitate is produced when small amounts of two colourless solutions are mixed together. Which pairs of solutions produce a white precipitate? 1 sodium hydroxide and zinc nitrate 2 sodium hydroxide and aluminium chloride 3 barium chloride and sulfuric …
- Question 19
Solution Q is warmed with ammonium chloride. In a separate experiment, solution Q is added to methyl orange. Which observations show that solution Q is basic? warmed with ammonium chloride added to methyl orange A gas is produced turns red …
- Question 20
Some general rules for the solubility of salts in water are listed. ● Carbonates are insoluble (except ammonium carbonate, potassium carbonate and sodium carbonate). ● Chlorides are soluble (except lead(II) chloride and silver chloride). ● Nitrates are soluble. ● Sulfates …
- Question 21
Elements in Group I of the Periodic Table react with water. Which row describes the products made in the reaction and the trend in reactivity of the elements? products trend in reactivity A metal hydroxide and hydrogen less reactive down …
- Question 22
The equation shows the reaction between a halogen and aqueous bromide ions. X2 + 2Br– …
- Question 23
An inert gas R is used to fill weather balloons. Which descriptions of R are correct? number of outer shell electrons in atoms of R structure of gas …
- Question 24
Heating copper(II) carbonate produces copper(II) oxide and carbon dioxide. Heating the copper(II) oxide formed with carbon produces copper. Which colour changes are observed during these reactions? A green → black → brown B green → white → brown C blue …
- Question 25
Calcium reacts with cold water to produce hydrogen. Lead reacts slowly when heated in air to form an oxide but has almost no reaction with steam. Silver does not react with either air or water. Zinc reacts when heated with …
- Question 26
Which row describes the use of a metal and the property upon which the use depends? metal use property A aluminium aircraft bodies aluminium is a heat conductor B aluminium cooking utensils aluminium has a low density C copper cooking …
- Question 27
Which statement about the manufacture of aluminium by electrolysis is correct? A Aluminium ions are oxidised to aluminium by gaining electrons. B Aluminium is extracted from its ore hematite. C Molten cryolite is used to dissolve the aluminium oxide. D …
- Question 28
Ammonia is manufactured by the Haber process from nitrogen and hydrogen. Which row gives the main sources of these two gases? hydrogen nitrogen A air air B air natural gas C natural gas air D natural gas natural gas
- Question 29
Which equation represents the incomplete combustion of propane, …
- Question 30
Argon is a noble gas used to fill light bulbs. What is the approximate percentage of argon in air? …
- Question 31
The diagrams show experiments involving the rusting of iron. water boiled to remove the air water anhydrous calcium chloride to dry the air oil iron nails tube Q tube R tube P A student predicted the following results. 1 In …
- Question 32
Which statement about the carbon cycle is correct? A Animals and plants need carbon dioxide for respiration. B Combustion of plants and natural gas produces carbon dioxide. C Plants produce glucose from carbon dioxide and oxygen. D Oxygen is produced …
- Question 33
Which statement about sulfur or one of its compounds is correct? A Sulfur occurs naturally as the element sulfur. B Sulfur dioxide is used to kill bacteria in drinking water. C Sulfuric acid is a weak acid. D Dilute sulfuric …
- Question 34
Which equation represents the formation of lime? A CaCO3 → CaO + CO2 B CaO …
- Question 35
Which equation representing a reaction of methane is correct? A CH4 + Cl 2 → CH3Cl + HCl B CH4 + Cl 2 → CH4Cl 2 C CH4 + Cl 2 → CH2Cl …
- Question 36
Which two compounds are molecules which both contain a double bond? A ethane and ethanoic acid B ethane and ethanol C ethene and ethanoic acid D ethene and ethanol
- Question 37
Ethanol can be formed by: 1 fermentation 2 reaction between steam and ethene. Which of these processes use a catalyst? …
- Question 38
Sugar can be fermented to produce ethanol. Some of the stages in the process to produce and purify ethanol are listed. 1 Leave in a warm place. 2 Add yeast. 3 Fractionally distil the solution. 4 Dissolve the sugar in …
- Question 39
Which statement about ethanoic acid is correct? A It contains a –C2H5 group. B It is a strong acid. C It is formed by the reduction of ethanol. D It reacts with alcohols to form esters.
- Question 40
The structure of a polymer is shown. …
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