Cambridge IGCSE · 0620 · Paper 2 · Multiple choice (Extended)
Chemistry 0620/21 Oct/Nov 2018 past paper
Cambridge IGCSE Chemistry (0620) Paper 2 (Multiple choice (Extended)), variant 1, 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
- 28
File names: 0620_w18_qp_21 · 0620_w18_ms_21
Grade thresholds for 0620/21 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 |
|---|---|---|---|---|---|---|
| 28 | 24 | 21 | 18 | 15 | 13 | 11 |
Topics in this paper
Which syllabus chapters 0620/21 Oct/Nov 2018 tested, by marks. Each chapter links to every past-paper question on it.
Questions in 0620/21 Oct/Nov 2018
- Question 1
When smoke particles are observed with a microscope they are seen to move around randomly. This is called Brownian motion. What causes Brownian motion? A diffusion of the smoke particles B molecules in the air hitting the smoke particles C …
- 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
Iodine, I, has a lower relative atomic mass than tellurium, Te, but is placed after it in the Periodic Table. Te I Which statement explains why iodine is placed after tellurium in the Periodic Table? A Iodine has fewer neutrons …
- Question 4
Which statement about the isotopes of an element is correct? A Their physical properties are different because they have different proton numbers. B Their atomic masses are different because they have different numbers of electron shells. C They have the …
- Question 5
Which two molecules contain the same number of electrons? A Cl 2 and SO2 B CH4 and H2O C CO and NH3 D CO2 and HCl
- Question 6
Which statement describes the lattice structure of a metal? A The lattice consists of alternating positive ions and negative ions. B The lattice consists of neutral atoms arranged in layers. C The lattice consists of positive ions in a ‘sea …
- Question 7
Which gas sample contains the most molecules? A 24 dm3 of carbon dioxide, CO2 …
- Question 8
A student mixed together 25.0 cm3 of 1.00 mol / dm3 hydrochloric acid and 25.0 g of calcium carbonate. 2HCl (aq) + CaCO3(s) → CaCl 2(aq) …
- Question 9
Iron can react with sulfur to form two ionic compounds. The iron is present as Fe2+ in one compound and as Fe3+ in the other compound. The sulfur ion is present as S2– in both compounds. What are the formulae …
- Question 10
Aqueous copper(II) sulfate is electrolysed using carbon electrodes. What is the product at each electrode? product at the positive electrode product at the negative electrode A copper oxygen B hydrogen oxygen C oxygen copper D oxygen hydrogen
- Question 11
The diagram shows a circuit used to electrolyse aqueous copper(II) sulfate. …
- Question 12
Methane burns in an excess of oxygen. The equation is shown. CH4(g) …
- Question 13
The equation for the formation of ammonia is shown. …
- Question 14
The effects of a change in conditions on a chemical reaction are listed. 1 The total number of collisions per minute increased. 2 The number of effective collisions per minute increased. 3 The average energy of the particles increased. Which …
- Question 15
When BiCl 3 reacts with water, a white precipitate of BiOCl is formed. The equation for the reaction is shown. BiCl 3(aq) + H2O(l) BiOCl (s) + 2HCl (aq) Which statements are correct? 1 The reaction is reversible. 2 When …
- Question 16
An excess of iron(II) chloride is added to acidified potassium manganate(VII). Which statements are correct? 1 The purple colour disappears. 2 Iron(II) is reduced to iron(III). 3 Manganate(VII) ions are oxidised to manganese(II) ions. 4 Potassium manganate(VII) is an oxidising …
- Question 17
Part of the Periodic Table is shown. Which element forms an oxide that reacts with dilute acid to form a salt and water? I II III IV V VI VII VIII …
- Question 18
Aqueous sodium hydroxide is added to solid Q in a test-tube. A gas is produced which turns damp red litmus blue. What is Q? A aluminium B ammonia C ammonium chloride D sodium nitrate
- Question 19
Potassium hydroxide is a base. Which statement describes a reaction of potassium hydroxide? A Chlorine is formed when it is heated with ammonium chloride. B It turns Universal Indicator green. C It reacts with an acid to produce a salt …
- 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
A student heated copper(II) carbonate and copper(II) nitrate in separate test-tubes. Both compounds decomposed. Which row shows the gases produced from each reaction? copper(II) carbonate copper(II) nitrate A carbon dioxide nitrogen dioxide only B carbon dioxide oxygen only C carbon …
- Question 25
Metal X reacts with steam but not with cold water. What is X? A calcium B copper C sodium D zinc
- Question 26
Which row shows uses of the metals listed? aluminium copper mild steel A aircraft manufacture food containers cutlery B cutlery electrical wiring chemical plant C electrical wiring aircraft manufacture cooking utensils D food containers cooking utensils car bodies
- Question 27
Aluminium objects do not need protection from corrosion. Iron objects must be protected from corrosion. Why does aluminium resist corrosion? A Aluminium does not form ions easily. B Aluminium does not react with water or air. C Aluminium has a …
- Question 28
Which statement describes the role of iron in the Haber process? A It is used as a catalyst. B It is used as a reducing agent. C It is used to condense the ammonia gas into a liquid. D It …
- Question 29
Which statement about air pollutants is not correct? A Carbon monoxide is formed from the complete combustion of petroleum. B Lead compounds are formed from some types of petrol. C Oxides of nitrogen are formed from the combustion reactions inside …
- 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
A diagram of the carbon cycle is shown. dead organisms animals plants carbon dioxide fossil fuels …
- 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 reaction is endothermic? A CaCO3 → CaO + CO2 B CaO + 2HCl → CaCl …
- 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
When the alcohol CH3CH2CH2OH reacts with the carboxylic acid CH3CH2CH2COOH an ester is formed. What is the name and structural formula of this ester? name structural formula A butyl propanoate CH3CH2COOCH2CH2CH2CH3 B butyl propanoate CH3CH2CH2COOCH2CH2CH3 C propyl butanoate CH3CH2COOCH2CH2CH2CH3 D …
- Question 39
A solution of ethanol and water is left to stand in an open beaker in a warm room for three weeks. Which statement explains what happens to the ethanol in the solution? A The ethanol is dehydrated to ethene. B …
- Question 40
The structure of a polymer is shown. …
Other Chemistry papers from Oct/Nov 2018
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