IGCSE Chemistry (0971) — May–June 2025, Paper 22
40 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →An ice cube melts. The diagram shows an ice cube changing into a pool of water. What happens to the molecules of water in the ice cube? A They evaporate. B They dissolve. C They…
Answer this question and get it marked →A sample of a liquid, X, is heated to a temperature above its boiling point. X is then cooled, so that it condenses and then freezes. Which graph describes the change in…
Answer this question and get it marked →Which row gives the number of protons, electrons and neutrons in an atom of zinc? protons electrons neutrons --- --- --- --- A 30 30 35 B 30 35 35 C 35 30 30 D 35 35 30
Answer this question and get it marked →Which particles have the electronic configuration 2,8,8? 1 an argon atom, Ar 2 an aluminium ion, Al^3+ 3 a sodium ion, Na^+ 4 a chloride ion, Cl^- A 1 and 3 B 1 and 4 C 2 and 3 D…
Answer this question and get it marked →A sample of element Q has two isotopes. Their relative masses and abundances are shown. relative mass of isotope abundance /% --- --- 238 66 244 34 What is the relative atomic…
Answer this question and get it marked →Which statement about silicon(IV) oxide, SiO2, is correct? A It conducts electricity because it contains delocalised electrons. B It has a giant covalent structure with each…
Answer this question and get it marked →When 65 g of zinc reacts with 32 g of sulfur, 97 g of zinc sulfide is produced. When 65 g of zinc reacts with 40 g of sulfur, the mass of zinc sulfide produced is still 97 g.…
Answer this question and get it marked →Aluminium reacts with iron(III) oxide to form aluminium oxide and iron. Which chemical equation for the reaction between aluminium and iron(III) oxide is correct? A Al + FeO - AlO…
Answer this question and get it marked →The concentration of a solution of aqueous sodium hydroxide is 0.50 mol/dm^3. Which mass of sodium hydroxide is used to make 500 cm^3 of this solution? A 10 g B 20 g C 40 g D 160 g
Answer this question and get it marked →Molten zinc oxide is electrolysed using inert electrodes. Which row identifies the product at each electrode? anode cathode --- --- --- A zinc oxygen B hydrogen oxygen C oxygen…
Answer this question and get it marked →Dilute aqueous sodium chloride is electrolysed using platinum electrodes. What is the half-equation for the reaction at the cathode? A 2H^+ + 2e^- - H2 B Na^+ + e^- - Na C 2Cl^- -…
Answer this question and get it marked →Hydrogen-oxygen fuel cells can be used to power vehicles. Which statement about hydrogen-oxygen fuel cells is correct? A The equation for the overall reaction is H2 + O2 - H2O2. B…
Answer this question and get it marked →A reaction pathway diagram is shown. The energy of the products is higher than the energy of the reactants, with an energy barrier (activation energy) between them. Which row…
Answer this question and get it marked →The average bond energy for the C-H bond is 413 kJ/mol. What is the enthalpy change when 1.0 mol of methane molecules is formed from carbon and hydrogen atoms? A -1652 kJ B -413…
Answer this question and get it marked →Which statement describes the effect of adding a catalyst to a chemical reaction? A The activation energy, Ea, of the reaction is increased. B The enthalpy change, ΔH, of the…
Answer this question and get it marked →Which row describes the conditions used in the manufacture of sulfuric acid by the Contact process? catalyst pressure temperature --- --- --- --- A iron high high B iron low low C…
Answer this question and get it marked →Which equations show the underlined species acting as a reducing agent? (The underlined species is shown in brackets.) 1 [Fe2O3] + 3CO - 2Fe + 3CO2 2 [Fe] + CuSO4 - FeSO4 + Cu 3…
Answer this question and get it marked →A farmer incorrectly adds two substances to the soil at the same time. They react together to form a gas which turns damp red litmus paper blue. What are the two substances? A a…
Answer this question and get it marked →Which row shows the equations for the dissociation of hydrochloric acid and of ethanoic acid in aqueous solution? hydrochloric acid ethanoic acid --- --- --- A HCl(aq) - H^+(aq) +…
Answer this question and get it marked →Which three oxides are all acidic? A CaO, NO2, SO2 B CaO, CO2, Na2O C CO2, NO2, SO2 D CO2, Na2O, SO2
Answer this question and get it marked →The table shows some properties of noble gases. noble gas density in g/dm^3 boiling point in °C --- --- --- helium 0.2 -269 neon 0.9 -246 argon 1.8 -186 krypton xenon 5.9 -108…
Answer this question and get it marked →Sodium is a Group I metal. What is a physical property of sodium? A non-conductor of electricity B high melting point C high density D malleable
Answer this question and get it marked →Tennessine (atomic number 117) is a manufactured element that is below astatine in Group VII of the Periodic Table. What is the expected state of tennessine at room temperature…
Answer this question and get it marked →When chlorine is bubbled into aqueous sodium bromide, a displacement reaction occurs. Which description of this reaction is correct? A Chloride displaces bromide. B Chlorine…
Answer this question and get it marked →Brass is an alloy of copper. Which statement about brass or copper is correct? A Brass does not conduct electricity because it is a compound. B Copper conducts electricity because…
Answer this question and get it marked →The ionic equations for some reactions between metals and aqueous metal ions are shown. Cu + 2Ag^+ - 2Ag + Cu^2+ Mg + Zn^2+ - Mg^2+ + Zn Zn + Cu^2+ - Cu + Zn^2+ Sn + Cu^2+ - Sn^2+…
Answer this question and get it marked →Zinc is used to galvanise iron to prevent it from rusting. Which statements are correct? 1 Galvanising is an example of a barrier method. 2 If the zinc is scratched, the iron will…
Answer this question and get it marked →Which equation represents a reaction that occurs in a blast furnace during the extraction of iron from hematite? A Ca + CO2 - CaO + CO B Fe2O3 + 3Ca - 2Fe + 3CaO C Ca(OH)2 - CaO +…
Answer this question and get it marked →Water is added separately to anhydrous copper(II) sulfate and to anhydrous cobalt(II) chloride. Which row shows the colour changes? anhydrous copper(II) sulfate anhydrous…
Answer this question and get it marked →Gases which cause acid rain form in car engines. These gases can be removed using a catalytic converter. Which equation represents the removal of one of these gases using a…
Answer this question and get it marked →Which statements about carbon dioxide are correct? 1 Carbon dioxide absorbs thermal energy from the Earth. 2 Carbon dioxide increases the thermal energy loss to space. 3 The level…
Answer this question and get it marked →What is the structural formula of butan-2-ol? A CH3CH2CH2OH B CH3CH(OH)CH3 C CH3CH2CH2CH2OH D CH3CH2CH(OH)CH3
Answer this question and get it marked →Methanol reacts with ethanoic acid to form an ester. What is the displayed formula for this ester? A, B, C and D are displayed formulae of esters showing all bonds. A an ester…
Answer this question and get it marked →Petroleum can be separated into useful fractions by fractional distillation. Which row shows a correct use of the named fraction? fraction use --- --- --- A bitumen lubricant B…
Answer this question and get it marked →Ethane reacts with chlorine in the presence of ultraviolet light. Which products are formed? A ClCH2CH2Cl and H2 B 2CH3Cl and H2 C C2H5Cl and HCl D CH2=CH2 and 2HCl
Answer this question and get it marked →Ethanol can be made by the fermentation of aqueous glucose and by the catalytic addition of steam to ethene. What are two advantages of making ethanol by the catalytic addition of…
Answer this question and get it marked →The structure of a polymer repeat unit is shown. The repeat unit contains an amide (N-C linkage with adjacent C=O groups), indicating a condensation polymer (polyamide/nylon type)…
Answer this question and get it marked →Which item of apparatus is used to measure exactly 26.3 cm^3 of a liquid? A, B, C and D are diagrams of laboratory apparatus. A a burette (long graduated tube with a tap) B a…
Answer this question and get it marked →A mixture containing an aqueous salt and an insoluble salt is filtered. The diagram shows a filter funnel with filter paper (labelled X) sitting in a conical flask, with the…
Answer this question and get it marked →Pure ethanol has a melting point of -114 °C and a boiling point of 78 °C. What are the melting and boiling points of a sample of ethanol with glucose dissolved in it? melting…
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