IGCSE Chemistry (0620) — May–June 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 →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 →Which statement explains why water is a compound? A The hydrogen and oxygen atoms in a molecule of water can only be separated by chemical means. B The hydrogen and oxygen atoms…
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 →Which row describes properties of lithium fluoride? electrical conductivity electrical conductivity melting point when solid when molten A does not conduct conducts high B does…
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 substance has a giant covalent structure? A ethanol B graphite C methane D sodium chloride
Answer this question and get it marked →Sodium burns in oxygen to form sodium oxide. What is the balanced equation for the reaction? A 4Na + 2O → 2Na2O B 4Na + O2 → 2Na2O C 2Na2 + O2 → 2Na2O D 2Na2 + 2O → 2Na2O
Answer this question and get it marked →What is the relative formula mass of Mg(OH)2? A 21 B 30 C 42 D 58
Answer this question and get it marked →Dilute sulfuric acid is electrolysed using inert electrodes. The apparatus is set up as shown. dilute sulfuric acid graphite graphite cathode anode – + 30 cm3 of a gas is…
Answer this question and get it marked →Four statements about hydrogen fuel cells are listed. 1 The fuel cell converts chemical energy into electrical energy. 2 In the fuel cell, hydrogen combines with oxygen. 3 Carbon…
Answer this question and get it marked →5 g of four different fuels are set alight and placed under a beaker containing 50 cm3 of water. The temperature of the water is taken at the start and after five minutes. Which…
Answer this question and get it marked →Which changes increase the rate of reaction? 1 increasing the concentration of the reactants 2 increasing the particle size of a solid reactant 3 increasing the temperature A 1, 2…
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 between iron(III) oxide and carbon is shown. 2Fe2O3 + 3C → 4Fe + 3CO2 Which type of reaction does iron(III) oxide undergo? A reduction B…
Answer this question and get it marked →Copper(II) chloride is made when copper(II) carbonate reacts with dilute hydrochloric acid. What are the other products in this reaction? A water and carbon dioxide B carbon…
Answer this question and get it marked →Rubidium is in Group I and strontium is in Group II of the Periodic Table. Which row describes the nature of rubidium oxide, Rb2O, and strontium oxide, SrO? Rb2O SrO A acidic…
Answer this question and get it marked →Magnesium sulfate is a soluble solid which is formed when insoluble magnesium oxide reacts with dilute sulfuric acid. Which method is used to prepare solid magnesium sulfate? A…
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 →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 →Aqueous bromine is added to aqueous sodium iodide. bromine + sodium iodide → ......1...... + ......2...... What are the products of this reaction? 1 2 A iodide sodium bromide B…
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 describes the properties of argon? property 1 property 2 A inert diatomic B inert monatomic C reactive diatomic D reactive monatomic
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 →Which reaction in the blast furnace releases heat energy? A C + O2 → CO2 B CaCO3 → CaO + CO2 C CO2 + C → 2CO D Fe2O3 + 3CO → 2Fe + 3CO2
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 →Urea, CO(NH2)2, is used as a fertiliser. Which element that plants need for improved plant growth is provided by urea? A carbon B hydrogen C nitrogen D oxygen
Answer this question and get it marked →The percentage composition of gases on Neptune is shown. percentage gas composition / % hydrogen 80 helium 18 methane 1.5 other gases 0.5 Which statement about the atmospheres on…
Answer this question and get it marked →Which row shows the general formula for alkenes and for alcohols? alkenes alcohols A CnH2n CnH2n+1COOH B CnH2n CnH2n+1OH C CnH2n+2 CnH2n+1COOH D CnH2n+2 CnH2n+1OH
Answer this question and get it marked →A molecule has the formula C2H5Cl. What is its chemical name? A chloroethane B chloroethanol C chloroethene D chloromethanol
Answer this question and get it marked →Which compound rapidly decolourises aqueous bromine? A ethane B ethanoic acid C ethanol D ethene
Answer this question and get it marked →Compound Z has the molecular formula C2H6O. Which statement about compound Z is correct? A Z is unsaturated. B Z is a carboxylic acid. C Z is formed by the reaction of ethane with…
Answer this question and get it marked →What is the formula of the salt formed when aqueous ethanoic acid reacts with calcium carbonate? A Ca(CH3COOH)2 B Ca(CH3COO)2 C Ca2CH3COOH D Ca2CH3COO
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 →Chromatography is carried out on mixture Y and dyes E, F, G and H. The chromatogram is shown. solvent front baseline Y E F G H Which dyes are present in mixture Y? A E and G B E…
Answer this question and get it marked →A fractionating column is used to separate the hydrocarbon fractions in petroleum by fractional distillation. Which row describes the properties of the fractions that condense at…
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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