Cambridge IGCSE · 0620 · Paper 2 · Multiple choice (Extended)
Chemistry 0620/23 Oct/Nov 2020 past paper
Cambridge IGCSE Chemistry (0620) Paper 2 (Multiple choice (Extended)), variant 3, Oct/Nov 2020: the question paper and its official mark scheme, 40 questions worth 40 marks, with the grade thresholds. Free to open, no account needed.
- Questions
- 40
- Marks
- 40
- Grade A from
- 30
File names: 0620_w20_qp_23 · 0620_w20_ms_23
Grade thresholds for 0620/23 Oct/Nov 2020
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 | 26 | 22 | 19 | 16 | 14 | 12 |
Topics in this paper
Which syllabus chapters 0620/23 Oct/Nov 2020 tested, by marks. Each chapter links to every past-paper question on it.
Questions in 0620/23 Oct/Nov 2020
- Question 1
Which gas has the slowest rate of diffusion? …
- Question 2
When a dark grey solid element is heated, it changes directly into a purple gas. Which word describes this change? A boiling B evaporation C melting D sublimation
- Question 3
Nickel(II) sulfate is a green solid that is soluble in water. Which method is used to obtain a pure sample of nickel(II) sulfate crystals from a mixture of nickel(II) sulfate and sand? A Heat the mixture with water and distil …
- Question 4
In the chromatography experiment shown, which label represents the solvent front? …
- Question 5
Molecules containing only non-metal atoms are covalently bonded. The formulae of four covalently bonded molecules are given below: 1 nitrogen, N2 2 carbon dioxide, CO2 3 ethene, C2H4 4 methanol, CH3OH Which of the molecules contain double bonds? A 1 …
- Question 6
The arrangements of the electrons in two ions formed from elements X and Y are shown. …
- Question 7
Magnesium reacts with sulfuric acid. What are the formulae of the products formed in this reaction? A MgSO4 and H2 B MgSO4 and H2O C Mg(SO4)2 and H2 D Mg(SO4)2 and H2O
- Question 8
Sodium reacts with chlorine to form sodium chloride. Which row describes the bonding in the three substances? sodium chlorine sodium chloride A covalent covalent covalent B covalent metallic ionic C metallic covalent ionic D metallic metallic covalent
- Question 9
Rubidium is in Group I of the Periodic Table and bromine is in Group VII. Rubidium reacts with bromine to form an ionic compound. Which row shows the electron change taking place for rubidium and the correct formula of the …
- Question 10
Which statement explains why graphite is used as a lubricant? A All bonds between the atoms are weak. B It conducts electricity. C It has a low melting point. D Layers in the structure can slide over each other.
- Question 11
The relative atomic mass of chlorine is 35.5. When calculating relative atomic mass, which particle is the mass of a chlorine atom compared to? A a neutron B a proton C an atom of carbon-12 D an atom of hydrogen-1
- Question 12
What is the empirical formula of an oxide of iron, formed by reacting 2.24 g of iron with 0.96 g of oxygen? A FeO B Fe2O C Fe2O3 D Fe3O4
- Question 13
Electrolysis is carried out on dilute aqueous potassium bromide. Which products are formed at the anode and the cathode? anode cathode A bromine hydrogen B bromine potassium C hydrogen bromine D hydrogen potassium
- Question 14
Which substance does not require oxygen in order to produce energy? A coal B hydrogen C natural gas D 235U
- Question 15
Ethanol is used as a fuel. ethanol + oxygen carbon dioxide + water Which statements are correct? 1 The reaction is endothermic. 2 The products have more energy than the reactants. 3 The oxygen for this reaction comes from …
- Question 16
The reaction between hydrogen and oxygen releases 486 kJ / mol of energy. …
- Question 17
Which reaction of hydrochloric acid is a redox reaction? A 2Na + 2HCl 2NaCl …
- Question 18
Which reaction is an example of a photochemical reaction? A glucose forming carbon dioxide and water B magnesium reacting with oxygen C potassium reacting with water D silver chloride forming silver metal
- Question 19
An excess of calcium carbonate is added to dilute hydrochloric acid, X. The carbon dioxide gas given off is collected and its volume recorded at regular time intervals. Line X on the graph shows the results obtained. The experiment is …
- Question 20
Period 3 of the Periodic Table contains the elements sodium to argon. Element Q is a non-metal from this period. Which statement about Q is correct? A It conducts electricity. B It has a lower proton number than sodium. C …
- Question 21
Which metal has variable oxidation states? A aluminium B calcium C copper D sodium
- Question 22
An aqueous cation reacts with aqueous sodium hydroxide to form a white precipitate. The precipitate is insoluble in excess sodium hydroxide. What is the aqueous cation? A aluminium ion B calcium ion C chromium ion D zinc ion
- Question 23
Zinc oxide is an amphoteric oxide. Which row describes the reactions of zinc oxide? reaction with alkalis reaction with acids …
- Question 24
A student carries out an experiment to prepare pure magnesium sulfate crystals. The diagram shows the first stage of the preparation. dilute sulfuric acid stirrer magnesium carbonate He adds magnesium carbonate until no more reacts. Which process should he use …
- Question 25
Which statement about the halogens and their compounds is correct? A The colour of the element gets lighter going down Group VII. B The elements get less dense going down Group VII. C When chlorine is added to sodium iodide …
- Question 26
Elements in Group II of the Periodic Table show the same trends in their reaction with water and their density as Group I. Which row shows how the properties of barium compare with calcium? reaction with water density A faster …
- Question 27
A flammable gas needs to be removed from a tank at an industrial plant. For safety reasons, an inert gas is used. Which gas is suitable? A argon B hydrogen C methane D oxygen
- Question 28
An experiment is performed to determine the order of reactivity of metals X and Y compared to lead. Strips of each metal were added to separate test-tubes containing aqueous lead(II) nitrate, Pb(NO3)2. The results are shown. metal X Pb(NO3)2(aq) metal …
- Question 29
The equation for the reaction between iron(III) oxide and carbon monoxide is shown. Fe2O3 + xCO yFe + zCO2 Which values of x, y and z balance the equation? …
- Question 30
Which process is used to separate oxygen from liquid air? A chromatography B distillation C filtration D fractional distillation
- Question 31
What is the catalyst in the Haber process? A Fe B Ni C Pt D V2O5
- Question 32
Ammonia is manufactured in an exothermic reaction. …
- Question 33
Part of the carbon cycle is shown. glucose combustion P Q CO2 R plant CH4 What are processes P, Q and …
- Question 34
Which row shows the conditions used for the manufacture of sulfuric acid in the Contact process? pressure / atm temperature / C catalyst …
- Question 35
Which calcium compound does not neutralise an acid soil? A calcium oxide B calcium sulfate C calcium hydroxide D calcium carbonate
- Question 36
Which product is obtained when bromine reacts with propene, CH3CH=CH2? A CH3CH=CHBr B CH3CBr=CHBr C CH3CH2CHBr2 D CH3CHBrCH2Br
- Question 37
Propanol is oxidised by acidified potassium manganate(VII) in a similar way to ethanol. Which compound is produced by the oxidation of propanol with acidified potassium manganate(VII)? A CH3CH2OH B CH3CH2CH2OH C CH3COOH D CH3CH2COOH
- Question 38
The flow chart shows the preparation of ethanol and some important chemistry of ethanol. ethanol carbon dioxide + substance Z substance X process Y fermentation What are X, Y and …
- Question 39
Which equation represents the formation of poly(propene) from propene? …
- Question 40
Which type of linkage joins the amino acids in a protein? …
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