IGCSE Chemistry (0971) — October–November 2023, Paper 12
40 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →The melting points and boiling points of four elements are shown (melting point / degrees C, boiling point / degrees C): W -7, 60; X -101, -34; Y 114, 184; Z 39, 688. In which…
Answer this question and get it marked →Which statements about clean, dry air are correct? 1 It is a mixture of elements only. 2 It is a mixture of elements and compounds. 3 It contains only non-metals. A 1 and 3 B 1…
Answer this question and get it marked →A representation of an atom is shown, with a nucleus containing 6 protons (+) and a number of neutrons, surrounded by electrons (-). What is the nucleon number of this atom? A 6 B…
Answer this question and get it marked →Which statement describes isotopes of the same element? A They have different electron arrangements. B They have different nuclear charges. C They have nuclei with masses that are…
Answer this question and get it marked →Potassium reacts with iodine to form potassium iodide. Which statement about potassium iodide is correct? A Each potassium atom shares a pair of electrons with an iodine atom. B…
Answer this question and get it marked →Which row describes the properties of a simple molecular substance? Columns: boiling point, electrical conductivity when solid. A low, poor B high, poor C low, good D high, good
Answer this question and get it marked →Different forms of an element G are used as lubricants and in cutting tools. What is the structure of G? A giant covalent B ionic C metallic D simple covalent
Answer this question and get it marked →The diagram shows the structure of a molecule of ethyl ethanoate (CH3-C(=O)-O-CH2-CH3). What is the molecular formula of a molecule of ethyl ethanoate? A CHO B C4H8O2 C…
Answer this question and get it marked →The formula of a compound containing element X is Na2X2O3. The relative formula mass of the compound is 158. What is the relative atomic mass of X? A 32 B 59.5 C 64 D 119
Answer this question and get it marked →Limestone is used to reduce sulfur dioxide emissions from coal-fired power stations: CaCO3 + SO2 - CaSO3 + CO2. What is the smallest mass of CaCO3 required to remove 1 tonne of…
Answer this question and get it marked →Which statement about electrolysis is correct? A Bromine and hydrogen are formed during the electrolysis of molten lead(II) bromide. B Metals are formed at the positive electrode.…
Answer this question and get it marked →Which statements about hydrogen-oxygen fuel cells are correct? 1 The reaction between hydrogen and oxygen is endothermic. 2 The waste product in a hydrogen-oxygen fuel cell is…
Answer this question and get it marked →The initial and final temperatures of four different reactions are measured. Which reaction is the least exothermic? Columns: initial temperature / degrees C, final temperature /…
Answer this question and get it marked →Solid calcium carbonate reacts with dilute hydrochloric acid. Which changes to the reaction conditions increase the rate of reaction? Columns: concentration of hydrochloric acid,…
Answer this question and get it marked →Zinc reacts slowly with dilute sulfuric acid at room temperature. Bubbles of a gas, L, form on the surface of the zinc. When a small amount of copper is added, the reaction is…
Answer this question and get it marked →Which reaction shows a colour change from white to blue? A adding water to anhydrous copper(II) sulfate B adding water to hydrated copper(II) sulfate C heating anhydrous…
Answer this question and get it marked →In a blast furnace, iron(III) oxide is converted to iron and carbon monoxide is converted to carbon dioxide: Fe2O3 + 3CO - 2Fe + 3CO2. What happens to each of these reactants? A…
Answer this question and get it marked →Which products are formed when magnesium carbonate reacts with dilute hydrochloric acid? A carbon dioxide, hydrogen and magnesium chloride B carbon dioxide and magnesium chloride…
Answer this question and get it marked →Which element forms an oxide that reacts with an aqueous solution of a base? A argon B sulfur C magnesium D copper
Answer this question and get it marked →Which salt is insoluble? A barium sulfate B lead(II) nitrate C magnesium chloride D sodium carbonate
Answer this question and get it marked →Some properties of element R are shown: melting point 98 degrees C; boiling point 883 degrees C; reaction with cold water gives off H2 gas; reaction when heated with oxygen burns…
Answer this question and get it marked →Lithium, sodium and potassium are elements in Group I. Statements: 1 Lithium is more dense than sodium. 2 Sodium is more reactive than potassium. 3 They all conduct electricity at…
Answer this question and get it marked →An outline of the Periodic Table is shown, with column Y indicated (the second column from the right, i.e. Group VII). Which name is given to the elements in column Y? A alkali…
Answer this question and get it marked →Which row describes the properties of a metal that can be used in the manufacture of aircraft? Columns: strength, density, ease of corrosion. A high, high, corrodes easily B high,…
Answer this question and get it marked →Which metallic element is added to iron in the manufacture of stainless steel? A carbon B copper C lead D nickel
Answer this question and get it marked →Which statement about the uses of metals is correct? A Aluminium is used in the manufacture of overhead electrical cables as it has a high density. B Aluminium is used to make…
Answer this question and get it marked →The list gives the order of some metals and hydrogen in the reactivity series (most reactive first): K, Mg, Zn, H, X, Cu (least reactive). Which row shows the properties of metal…
Answer this question and get it marked →Which gas in the air is needed for iron to rust? A argon B carbon dioxide C nitrogen D oxygen
Answer this question and get it marked →Why is limestone added to the blast furnace? A It neutralises the molten slag produced. B It reacts with impurities to form slag. C It releases carbon dioxide which reduces the…
Answer this question and get it marked →Which process removes carbon dioxide from the atmosphere? A photosynthesis B thermal decomposition of calcium carbonate C combustion of fossil fuels D reaction of sodium carbonate…
Answer this question and get it marked →The flow chart shows stages in the treatment of river water to produce drinking water: river water - sedimentation tank - stage J - stage K - drinking water. What occurs at stages…
Answer this question and get it marked →Which two compounds can be mixed together to form an NPK fertiliser? A ammonium phosphate and calcium hydroxide B calcium phosphate and ammonium nitrate C potassium nitrate and…
Answer this question and get it marked →What are the main substances produced by the fractional distillation of liquid air? A oxygen and carbon dioxide B oxygen and nitrogen C helium and nitrogen D hydrogen and oxygen
Answer this question and get it marked →Which diagram shows the displayed formula for the named organic compound? Four displayed formulae A-D are shown, labelled ethanoic acid, ethene, ethanol and methane; the correct…
Answer this question and get it marked →Poly(ethene) is formed from petroleum using three separate processes. In which order are the processes used? A cracking - fractional distillation - polymerisation B cracking -…
Answer this question and get it marked →Gas oil and naphtha are two fractions obtained from petroleum. What are uses of gas oil and naphtha? Columns: gas oil, naphtha. A jet fuel, making chemicals B jet fuel, making…
Answer this question and get it marked →Ethene can be polymerised. Which diagram represents the structure of the product formed? Four structures A-D are shown; the correct one is the poly(ethene) repeat unit -(CH2-CH2)-…
Answer this question and get it marked →An acid-base titration is described: 25.0 cm3 of dilute aqueous alkali is put into a conical flask; indicator is added; dilute acid is added until the indicator changes colour;…
Answer this question and get it marked →The apparatus shown (a flask heated with a condenser, i.e. simple distillation) is used to separate a mixture. What is the mixture? A anhydrous copper(II) sulfate and hydrated…
Answer this question and get it marked →The results of tests on three gases, X, Y and Z, are shown. aqueous potassium manganate(VII): X purple to colourless, Y no change, Z no change damp red litmus paper: X no change,…
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