IGCSE Chemistry (0620) — October–November 2024, Paper 22
40 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Oxygen melts at -219 °C and boils at -183 °C. At which temperature is oxygen a liquid? A -225 °C B -189 °C C -175 °C D 25 °C
Answer this question and get it marked →The pressure of a sample of gas is decreased. The temperature is kept constant. Which row describes the effects on the particles? movement of particles collisions between…
Answer this question and get it marked →Rubidium has two isotopes, 85/37 Rb and 87/37 Rb. Which statement explains why both isotopes have the same chemical properties? A They have the same number of protons. B They have…
Answer this question and get it marked →Which pair of elements react to form a compound with a strong attraction between oppositely charged ions? A carbon and bromine B carbon and nitrogen C sodium and oxygen D sodium…
Answer this question and get it marked →Four substances, P, Q, R and S, are described. - P is diatomic. - Q is a good conductor of electricity when solid and when molten. - R is a silver solid with a very high melting…
Answer this question and get it marked →Which diagram shows the covalent bonding in a molecule of carbon dioxide? A O-C-O B O=C-O C O=C=O D O≡C≡O
Answer this question and get it marked →The bonding, structure and melting point of sodium chloride and sulfur dichloride are shown: sodium chloride is ionic, giant lattice, melting point 801 °C; sulfur dichloride is…
Answer this question and get it marked →Diamond and graphite have giant covalent structures of carbon atoms. Which statement describes graphite? A It has a strong, rigid three-dimensional structure. B It has four strong…
Answer this question and get it marked →Which row explains the malleability and electrical conductivity of a solid metal? malleability electrical conductivity --- --- --- A Delocalised electrons can move freely through…
Answer this question and get it marked →The equation for the decomposition of ammonium carbonate, (NH4)2CO3, is shown. (NH4)2CO3(s) - 2NH3(g) + CO2(g) + H2O(l) [Mr of (NH4)2CO3 = 96] The total volume of gas produced is…
Answer this question and get it marked →What is the empirical formula of a compound that contains 3.66 g of hydrogen, 37.8 g of phosphorus and 58.5 g of oxygen? A H6P2O6 B H4PO4 C H3PO3 D HPO
Answer this question and get it marked →Aqueous copper(II) sulfate is electrolysed using graphite electrodes. Which row identifies the product and observations at each electrode during the electrolysis? anode product…
Answer this question and get it marked →Molten sodium chloride is electrolysed using inert electrodes. Which row shows the products formed at the cathode and anode? cathode anode --- --- --- A chlorine hydrogen B…
Answer this question and get it marked →The equation for the formation of ammonia is shown. N2 + 3H2 - 2NH3 The reaction pathway diagram shows activation energy = +250 kJ/mol from the reactants N2 + 3H2 up to the peak,…
Answer this question and get it marked →Sulfur dioxide is converted to sulfur trioxide in the Contact process. The conditions used are 450 °C and 200 kPa with a vanadium(V) oxide catalyst. Which row describes and…
Answer this question and get it marked →Hydrogen gas reacts with iodine gas to form hydrogen iodide gas in an equilibrium reaction. H2(g) + I2(g) ⇌ 2HI(g) ΔH = +26.5 kJ/mol Which changes increase the yield of HI at…
Answer this question and get it marked →The equation for the reaction of carbon with carbon dioxide is shown. C + CO2 - 2CO Which row identifies the carbon atom that is reduced and its change in oxidation number? atom…
Answer this question and get it marked →Aqueous iron(II) sulfate is added to acidified potassium manganate(VII). The purple colour disappears. Aqueous potassium iodide is added to acidified potassium dichromate(VI). A…
Answer this question and get it marked →Which row shows the difference between a weak acid and a strong acid? weak acid strong acid --- --- --- A fully dissociated partially dissociated B concentrated dilute C dilute…
Answer this question and get it marked →Which substance turns methyl orange red? A aqueous ammonia B dilute hydrochloric acid C aqueous sodium hydroxide D distilled water
Answer this question and get it marked →Which row describes zinc oxide and calcium oxide? zinc oxide calcium oxide --- --- --- A basic acidic B acidic basic C amphoteric acidic D amphoteric basic
Answer this question and get it marked →Which row shows the properties of a transition element? catalyst colour of oxide electrical conductivity --- --- --- --- A yes red good B yes green poor C no yellow good D no…
Answer this question and get it marked →Fluorine is the element at the top of Group VII of the Periodic Table. Which statement describes fluorine? A It is inert. B It is monatomic. C It is non-metallic. D It is a solid…
Answer this question and get it marked →When aluminium is placed in dilute hydrochloric acid, there is no reaction. When zinc is placed in dilute hydrochloric acid, bubbles of gas are immediately given off. Which…
Answer this question and get it marked →Which statements about the use of sacrificial protection to prevent iron from rusting are correct? 1 A more reactive metal than iron is used as a sacrificial protector because it…
Answer this question and get it marked →Aluminium is extracted from its ore by electrolysis. What is the role of cryolite in this process? A to lower the operating temperature B to lower the boiling point of bauxite C…
Answer this question and get it marked →Which row identifies two greenhouse gases and three processes by which they contribute to global warming? two greenhouse gases three processes --- --- --- A carbon dioxide and…
Answer this question and get it marked →Which mixture contains all of the elements in a typical NPK fertiliser? A ammonium nitrate and calcium phosphate B ammonium phosphate and potassium chloride C potassium nitrate…
Answer this question and get it marked →Bromine reacts with but-2-ene. What is the displayed formula of the product of this reaction? (Four displayed formulae A-D are shown; the correct one has a Br atom added to each…
Answer this question and get it marked →Which statement is correct? A Bitumen is used as a fuel for ships. B Coal, natural gas and oxygen are all fuels. C Hydrogen is the main constituent of natural gas. D Petroleum is…
Answer this question and get it marked →Which statement explains why ethanoic acid is saturated? A The molecule dissociates completely in water. B There is a carbon-oxygen double bond in the molecule. C The…
Answer this question and get it marked →Which statement about compounds in the same homologous series is correct? A They have the same chemical properties because they have the same number of carbon atoms. B They have…
Answer this question and get it marked →Which row shows the properties of methane? soluble in water state at room temperature gives a positive test with aqueous bromine --- --- --- --- A no gas no B no gas yes C yes…
Answer this question and get it marked →The table shows two methods used to make ethanol: fermentation (batch, 35 °C, 1 atm, yeast, sugar cane); adding steam to ethene (continuous, 300 °C, 60 atm, acid catalyst,…
Answer this question and get it marked →Which equation represents an addition reaction? A CH3CHO + HCN - CH3CH(OH)CN B C6H6 + Br2 - C6H5Br + HBr C NH4Br - NH3 + HBr D C14H30 - C2H4 + C8H18 + C4H8
Answer this question and get it marked →The structure of part of a polymer is shown, containing an amide (N-C=O) linkage and an ester (C-O-C=O) linkage. How many amide and ester linkages are included in the structure…
Answer this question and get it marked →Which structure represents part of a protein? (Four structures A-D are shown; the correct one shows repeating amino-acid units joined by amide/peptide -N-C(=O)- linkages.) A B C D
Answer this question and get it marked →Which piece of apparatus can only measure a single fixed volume? A a 250 cm3 beaker B a 50 cm3 burette C a 100 cm3 measuring cylinder D a 25 cm3 volumetric pipette
Answer this question and get it marked →Pure solid copper(II) nitrate can be obtained from a mixture of copper(II) nitrate and copper powder. Three stages in the method are listed. X add water and stir Y crystallise Z…
Answer this question and get it marked →Which row describes a test and the observation for aqueous sulfate ions? test observation --- --- --- A add dilute nitric acid a gas is produced which turns limewater cloudy B add…
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