IGCSE Chemistry (0620) — May–June 2025, Paper 13
40 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Liquid iron is cooled to form solid iron. Which statement about the particles in iron is correct? A The particles move further apart. B The particles move faster. C The position…
Answer this question and get it marked →Which diagram shows a mixture of an element and a compound? Each option (A, B, C, D) shows a box containing particles drawn as circles, where open (white) circles represent atoms…
Answer this question and get it marked →Which statement about elements and their atoms is correct? A Aluminium is in the second period of the Periodic Table and has two occupied electron shells. B Helium is in Group…
Answer this question and get it marked →An atom of the element erbium is represented by 167/68 Er (mass number 167, proton number 68). Which row shows the number of protons, neutrons and electrons in this atom? protons…
Answer this question and get it marked →Rubidium is in Group I of the Periodic Table and bromine is in Group VII of the Periodic Table. Rubidium reacts with bromine to form an ionic compound. Which row shows the…
Answer this question and get it marked →Which dot-and-cross diagram represents the electronic configuration for the outer shell electrons in ammonia, NH3? Each option (A, B, C, D) shows a dot-and-cross diagram of an…
Answer this question and get it marked →Which statements about graphite are correct? 1 Each carbon atom is covalently bonded to four other carbon atoms. 2 Graphite is an electrical conductor because it contains ions…
Answer this question and get it marked →Which equation represents the reaction of magnesium with dilute hydrochloric acid? A Mg(s) + 2HCl(aq) - MgCl2(aq) + H2(g) B Mg(s) + 2HCl(l) - MgCl2(s) + H2(g) C 2Mg(s) + 2HCl(aq)…
Answer this question and get it marked →The relative formula mass, Mr, of calcium carbonate, CaCO3, is 100. What is the mass of carbon present in 100 g of calcium carbonate? A 12 g B 36 g C 40 g D 60 g
Answer this question and get it marked →What is the definition of relative atomic mass? A It is the average mass of the isotopes of an element compared to 1/12 th of the mass of an atom of 12-C. B It is the total mass…
Answer this question and get it marked →Which row describes the electrolysis of molten potassium bromide? product at anode product at cathode --- --- --- A bromine hydrogen B bromine potassium C hydrogen bromine D…
Answer this question and get it marked →What is produced in a hydrogen-oxygen fuel cell? A hydrogen and oxygen B hydrogen only C carbon dioxide D water
Answer this question and get it marked →When ammonium nitrate is added to water, the temperature of the mixture decreases. The ammonium nitrate can be recovered by evaporating the water. Which statement explains these…
Answer this question and get it marked →Magnesium is reacted with dilute hydrochloric acid. The table shows the total volume of hydrogen produced every 15 seconds. time / s 0 15 30 45 60 75 90 105 120 --- --- --- ---…
Answer this question and get it marked →Which substance forms a blue solution when it is added to water? A cobalt(II) chloride B copper(II) sulfate C thymolphthalein D universal indicator
Answer this question and get it marked →Steam reacts with carbon to produce carbon monoxide and hydrogen. C(s) + H2O(g) - CO(g) + H2(g) Which substance is reduced in the reaction? A C B CO C H2 D H2O
Answer this question and get it marked →Three compounds are listed. 1 aluminium nitrate 2 ammonium chloride 3 ammonium nitrate All three compounds are heated with aqueous sodium hydroxide. Which compounds produce…
Answer this question and get it marked →A solution containing hydroxide ions, OH-(aq), is added to a solution containing hydrogen ions, H+(aq). An equation representing the reaction is shown. H+(aq) + OH-(aq) - H2O(l)…
Answer this question and get it marked →Which compound is an acidic oxide? A barium oxide B carbon dioxide C copper(II) oxide D magnesium oxide
Answer this question and get it marked →Which statement describes a hydrated salt? A It is an aqueous solution of a salt. B It is a solid salt that is chemically combined with water. C It is a solid salt that contains…
Answer this question and get it marked →In the Periodic Table, how does the metallic character of the elements vary from left to right across a period? A It decreases. B It increases. C It increases then decreases. D It…
Answer this question and get it marked →Lithium, sodium and potassium are elements in Group I of the Periodic Table. Which statements about these elements are correct? 1 They react with water to produce hydrogen. 2 The…
Answer this question and get it marked →X, Y and Z are each one of the elements chlorine, bromine and iodine. When aqueous X is mixed with aqueous ions of Y, there is no reaction. When aqueous Y is mixed with aqueous…
Answer this question and get it marked →Which row describes the properties of a transition element? melting point / degC density at r.t.p. colour and state of its oxide at r.t.p. --- --- --- --- A -210 low brown gas B…
Answer this question and get it marked →Which statements about the elements in Group VIII are correct? 1 They all have eight electrons in their outer electron shell. 2 They all react with sodium to form ionic compounds.…
Answer this question and get it marked →Sulfur and potassium are two elements in the Periodic Table. Which row identifies the element with the higher thermal conductivity and the element with the lower malleability?…
Answer this question and get it marked →Three statements about aluminium and copper are listed. 1 The density of aluminium is less than that of copper. 2 The electrical conductivity of copper is higher than that of…
Answer this question and get it marked →The table gives some information about the reactions of four metals, J, K, L and M. metal reactions --- --- J reacts with steam and hydrochloric acid but not with cold water K…
Answer this question and get it marked →What is the chemical name for rust? A anhydrous iron(II) oxide B anhydrous iron(III) oxide C hydrated iron(II) oxide D hydrated iron(III) oxide
Answer this question and get it marked →Water from natural sources can contain many dissolved substances. Which substances are often harmful to aquatic life? 1 dissolved oxygen 2 nitrates 3 phosphates A 1, 2 and 3 B 1…
Answer this question and get it marked →Which gas is over 30% of clean, dry air? A argon B carbon dioxide C nitrogen D oxygen
Answer this question and get it marked →Farmers use fertilisers to replace elements in the soil that have been removed by the crops they grow. Which elements in the soil are replaced by adding fertilisers? A Ca, P, O B…
Answer this question and get it marked →The equation for the reaction between carbon dioxide and water in the presence of chlorophyll and sunlight is shown. carbon dioxide + water --(chlorophyll / sunlight)-- glucose +…
Answer this question and get it marked →Which statement about members of a homologous series is correct? A They are elements with the same chemical properties. B They are compounds with the same functional group. C They…
Answer this question and get it marked →The molecular formulae of four organic compounds, W, X, Y and Z, are shown. W X Y Z --- --- --- --- C3H8O C3H6 C4H8O2 C6H14 Which statement about compounds W, X, Y and Z is…
Answer this question and get it marked →Fractional distillation is used to separate petroleum into useful fractions. Which statement about the properties of the fractions of petroleum is correct? A The refinery gas…
Answer this question and get it marked →Which statements about the alkanes are correct? 1 They are generally unreactive except in terms of combustion and substitution by chlorine. 2 They have the general formula…
Answer this question and get it marked →Which products can be formed by the cracking of one molecule of hexane, C6H14? A C4H10 and C2H4 only B C12H26 and H2 only C C3H7 only D C2H6 and C4H10 only
Answer this question and get it marked →Three coloured inks, P, Q and R, are tested using paper chromatography. The chromatogram is shown. On the chromatogram, ink P produced two spots, ink Q produced three spots (one…
Answer this question and get it marked →The table shows the results of two separate tests on a sample of aqueous T. test observation --- --- flame test yellow flame add dilute nitric acid effervescence What is the…
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