IGCSE Chemistry (0620) — 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.…
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? A B H N H H N H H H C D H N H H N H H H
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 BaCl 2(s) → BaCl 2(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. The apparatus used is shown. dilute aqueous hydrochloric acid, HCl (aq) dilute aqueous…
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. The equation is shown. CH4(g) + 2O2(g) → CO2(g) + 2H2O(g) Bond energies are shown. bond energy bond in kJ / mol C=O 805 C–H 410 O=O 496 O–H 460…
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? temperature pressure catalyst / °C / kPa A 300…
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 for the reaction is shown. CO32–(aq) + Cu2+(aq) → CuCO3(s)…
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? melting forms coloured density point compounds A high low no B high high yes C low low no D low low yes
Answer this question and get it marked →Which row identifies the properties of zinc? thermal reacts with conductivity 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? use of the metal property of the metal A car bodies ductile B cutlery conducts heat C…
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 as shown. cobalt(II) chloride…
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? bromine hydrogen A CH2BrCH2Br CH3CH3 B CH2BrCH2Br CH2CH2 C CH3CH2Br CH3CH3 D CH3CH2Br CH2CH2
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? from sugar by fermentation from ethene and…
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? O O H O O A C C N N C C N N H H H O O O O B C C O O C C O O O O H O O H C C C N N C C N N H H O O O O D C C O C O C O
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 + Cl 2 → C2H4 + 2HCl B C2H6 + Cl 2 → 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 are shown. solvent front N 10 cm M 2 cm baseline What is the Rf value of M and which…
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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