IGCSE Chemistry (0620) — 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 boiling element point / °C point / °C W –7 60 X –101 –34 Y 114 184 Z 39 688 In which elements do the…
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. – + + – – + + + – – + – What is the nucleon number of this atom? A 6 B 7 C 12 D 13
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? electrical boiling point 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. H O H C C H H H O C C H H H 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. The equation for the reaction is shown. CaCO3 + SO2 → CaSO3 + CO2 What is the smallest mass 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? initial final temperature temperature / °C / °C A 19 25 B 21…
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? concentration of surface area of hydrochloric…
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 in °C 98 boiling point in °C 883 reaction with cold water gives off H2 gas reaction when heated with oxygen burns to give a…
Answer this question and get it marked →Lithium, sodium and potassium are elements in Group I. Statements about these elements are listed. 1 Lithium is more dense than sodium. 2 Sodium is more reactive than potassium. 3…
Answer this question and get it marked →An outline of the Periodic Table is shown. Y Which name is given to the elements in column Y? A alkali metals B halogens C noble gases D transition elements
Answer this question and get it marked →Which row describes the properties of a metal that can be used in the manufacture of aircraft? strength density ease of corrosion A high high corrodes easily B high low resists…
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. Metal X is also included. most reactive K Mg Zn H X least reactive Cu Which row shows the properties…
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 sedimentation stage stage drinking water tank J K water What occurs at stages J and K?…
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? A B C D H O H H H O H H H H C C O O H H C C H H C C H H C C H H H H H H H H ethanoic acid ethene ethanol…
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? gas oil naphtha A jet fuel making chemicals B jet fuel making roads C diesel…
Answer this question and get it marked →Ethene can be polymerised. Which diagram represents the structure of the product formed? A B C D H H H H H H H H H H C C C C C C H C C C C H H H H H n H H n H H H H
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 to the flask. ● Dilute acid is added to the aqueous…
Answer this question and get it marked →The apparatus shown is used to separate a mixture. heat What is the mixture? A anhydrous copper(II) sulfate and hydrated copper(II) sulfate B sodium chloride and sand C ethanol…
Answer this question and get it marked →The results of tests on three gases, X, Y and Z, are shown. test X Y Z aqueous potassium manganate(VII) purple to colourless no change no change damp red litmus paper no change…
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