IGCSE Chemistry (0971) — May–June 2023, Paper 22
40 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Four physical changes of ethanol are listed. 1 condensation 2 evaporation 3 freezing 4 boiling In which changes do the particles move further apart? A 1 and 2 B 1 and 3 C 2 and 4…
Answer this question and get it marked →An atom of element X contains: 5 protons, 6 neutrons, 5 electrons. Which statements about element X are correct? 1 X has an atomic number of 6. 2 X has a nucleon number of 11. 3 X…
Answer this question and get it marked →Ammonia, NH3, is a covalent molecule. Which diagram shows the outer-shell electron arrangement in a molecule of ammonia? Four dot-and-cross diagrams A, B, C, D show H-N-H with an…
Answer this question and get it marked →Which structure does silicon(IV) oxide most closely resemble? A carbon dioxide B diamond C graphite D sodium chloride
Answer this question and get it marked →Substance P conducts electricity when solid. Which particles move in solid P so that it can conduct electricity? 1 anions 2 cations 3 electrons A 1 and 2 B 1 only C 2 and 3 D 3…
Answer this question and get it marked →Which equation represents a chemical change? A BaCl2(s) - BaCl2(l) B Ca2+(aq) + SO42-(aq) - CaSO4(s) C KCl(s) + H2O(l) - K+(aq) + Cl-(aq) D Na+(aq) + NO3-(aq) - NaNO3(aq)
Answer this question and get it marked →Which sample contains the largest number of molecules? A 16 g of methane, CH4(g) B 16 g of oxygen, O2(g) C 16 g of phosphorus, P4(s) D 16 dm3 of methane at r.t.p., CH4(g)
Answer this question and get it marked →The concentration of a sample of dilute aqueous sodium hydroxide is found by titration, using dilute aqueous hydrochloric acid HCl(aq) in the burette and dilute aqueous sodium…
Answer this question and get it marked →In experiment 1, aqueous copper(II) sulfate is electrolysed using graphite electrodes. In experiment 2, aqueous copper(II) sulfate is electrolysed using copper electrodes. Which…
Answer this question and get it marked →Which substance is not produced during the electrolysis of concentrated aqueous sodium chloride? A chlorine B hydrogen C sodium D sodium hydroxide
Answer this question and get it marked →Methane burns in excess oxygen: CH4(g) + 2O2(g) - CO2(g) + 2H2O(g). Bond energies (kJ/mol): C=O 805, C-H 410, O=O 496, O-H 460. What is the energy change for the reaction? A (4 x…
Answer this question and get it marked →Which change increases the rate of reaction by decreasing the activation energy, Ea? A addition of a catalyst B decrease in size of solid reactants C increase in concentration of…
Answer this question and get it marked →In the Contact process, sulfur dioxide is reacted with oxygen to form sulfur trioxide. Which conditions are used in this reaction? Columns: temperature / degrees C, pressure /…
Answer this question and get it marked →Which reaction is reversible? A an iron nail rusting when left in moist air B limestone reacting with an acid to form carbon dioxide gas C magnesium burning in air to produce a…
Answer this question and get it marked →The equation for the reaction of sulfur dioxide with acidified potassium dichromate(VI) is shown: 3SO2 + Cr2O72- + 2H+ - 3SO42- + 2Cr3+ + H2O. What is oxidised and what is the…
Answer this question and get it marked →What is the definition of a strong acid? A a proton acceptor that is completely dissociated in aqueous solution B a proton acceptor that is partially dissociated in aqueous…
Answer this question and get it marked →Which statement about amphoteric oxides is correct? A They are made by combining an acidic oxide with a basic oxide. B They react with water to give a solution of pH 7. C They…
Answer this question and get it marked →Copper(II) carbonate is formed when aqueous sodium carbonate is added to aqueous copper(II) nitrate. The ionic equation is: CO32-(aq) + Cu2+(aq) - CuCO3(s). How is pure copper(II)…
Answer this question and get it marked →Q and R are elements in the same period of the Periodic Table. Q has 7 electrons in its outer shell and R has 2 electrons in its outer shell. Which statement about Q and R is…
Answer this question and get it marked →Lead(II) sulfate is an insoluble salt. Which reaction produces a mixture from which lead(II) sulfate is obtained by filtration? A adding solid lead(II) carbonate to dilute…
Answer this question and get it marked →Which statement about alkali metals is correct? A Lithium is more dense than sodium. B Sodium is more reactive than potassium. C Sodium has a higher melting point than potassium.…
Answer this question and get it marked →Which row describes the properties of a transition element? Columns: melting point, density, forms coloured compounds. A high, low, no B high, high, yes C low, low, no D low, low,…
Answer this question and get it marked →Which row identifies the properties of zinc? Columns: thermal conductivity, reacts with dilute acid. A good, yes B good, no C poor, yes D poor, no
Answer this question and get it marked →Uses of metals depend on their properties. Which property is necessary for the use given? Columns: use of the metal, property of the metal. A car bodies, ductile B cutlery,…
Answer this question and get it marked →Which compounds both contribute to acid rain? A carbon monoxide and carbon dioxide B carbon monoxide and oxides of nitrogen C oxides of nitrogen and sulfur dioxide D sulfur…
Answer this question and get it marked →P, Q, R and S are metals. P reacts with dilute hydrochloric acid, forming hydrogen. Q reacts violently with water. R reacts with water to give hydrogen. S is formed by heating its…
Answer this question and get it marked →Which compound is formed when iron rusts? A anhydrous iron(II) oxide B anhydrous iron(III) oxide C hydrated iron(III) hydroxide D hydrated iron(III) oxide
Answer this question and get it marked →Why is cryolite used in the extraction of aluminium by electrolysis? A It dissolves the aluminium oxide. B It protects the anodes from corrosion. C It changes bauxite to aluminium…
Answer this question and get it marked →A wax candle is made from a mixture of hydrocarbons. The candle is lit and placed in a gas jar along with a strip of cobalt(II) chloride test paper. After a short time, the oxygen…
Answer this question and get it marked →The hydrocarbon C4H8 has two structural isomers, but-1-ene and but-2-ene. Which statement is correct? A But-2-ene has the structural formula CH3CH=CHCH3 and the same general…
Answer this question and get it marked →Which compound rapidly decolourises aqueous bromine? A propane B propanoic acid C propanol D propene
Answer this question and get it marked →What are the products of the addition reactions of ethene with bromine and hydrogen? Columns: bromine, hydrogen. A CH2BrCH2Br, CH3CH3 B CH2BrCH2Br, CH2CH2 C CH3CH2Br, CH3CH3 D…
Answer this question and get it marked →Ethanol is manufactured by fermentation and the catalytic addition of steam to ethene. Which row describes an advantage of both methods? Columns: from sugar by fermentation, from…
Answer this question and get it marked →Methanoic acid and propan-1-ol react to form an ester. What is the structural formula of the ester? A HCOOCH2CH2CH3 B CH3CH2COOCH3 C CH3COOCH2CH3 D CH3CH2CH2COOH
Answer this question and get it marked →What is the correct structure of PET? Four displayed polymer structures A, B, C, D are shown; the correct one (PET, a polyester) has ester (-O-CO-) linkages between the repeating…
Answer this question and get it marked →Alkanes undergo substitution reactions in the presence of UV light. Which equation represents a substitution reaction of ethane? A C2H6 + Cl2 - C2H4 + 2HCl B C2H6 + Cl2 - C2H5Cl +…
Answer this question and get it marked →Methane reacts with chlorine in substitution reactions. How many different products, containing a single carbon atom, can be made during the reactions? A 2 B 3 C 4 D 5
Answer this question and get it marked →Rock salt is a mixture of salt and sand. The method used to separate the sand from the salt is listed. step 1 Crush the rock salt, add to warm water and stir. step 2 Pour the…
Answer this question and get it marked →Two compounds, M and N, are dissolved in water and separated by chromatography. The results show a baseline and a solvent front at 10 cm; spot M moved 2 cm and spot N moved a…
Answer this question and get it marked →When acid is added to salt X, a gas is produced which turns limewater milky. When sodium hydroxide is added to salt X, a gas is produced which turns litmus paper blue. What is X?…
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