IGCSE Chemistry (0620) — May–June 2023, Paper 13
40 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Nitrogen is heated in a balloon, which expands slightly. Which statements about the molecules of nitrogen are correct? 1 They move further apart. 2 They move more quickly. 3 They…
Answer this question and get it marked →The diagrams represent some elements, compounds and mixtures. 1 2 3 4 Which row describes the numbered substances? 1 2 3 4 A element mixture of compounds compound mixture of…
Answer this question and get it marked →Two atoms, X and Y, have the same mass number but different atomic numbers. Which statement about X and Y is correct? A They have the same number of protons. B They have the same…
Answer this question and get it marked →The symbols for two different isotopes of element S are shown. m p nS qS The letters m, n, p and q represent whole numbers. Which statements about the values of m, n, p and q are…
Answer this question and get it marked →Which statement about potassium fluoride is correct? A It can conduct electricity when it is solid. B It dissolves in water. C It has a low melting point. D It is a molecule.
Answer this question and get it marked →In which molecule are all the outer-shell electrons involved in covalent bonding? A Cl 2 B CH4 C HCl D NH3
Answer this question and get it marked →What is the formula of potassium oxide? A P2O B PO2 C KO D K2O
Answer this question and get it marked →The compound magnesium nitrate has the formula Mg(NO3)2. What is the relative formula mass of magnesium nitrate? A 86 B 134 C 148 D 172
Answer this question and get it marked →Dilute sulfuric acid is electrolysed using inert electrodes. What is produced at the anode? A hydrogen B oxygen C sulfur D sulfur dioxide
Answer this question and get it marked →The flow diagram represents a hydrogen–oxygen fuel cell. input 1 output 1 fuel cell input 2 output 2 Which row shows the inputs and outputs? input 1 input 2 output 1 output 2 A…
Answer this question and get it marked →Which statement describes an exothermic reaction? A Thermal energy is transferred to the surroundings leading to a decrease in the temperature of the surroundings. B Thermal…
Answer this question and get it marked →Which row shows the changes that all increase the rate of a chemical reaction? concentration temperature particle size of reactants A decrease decrease decrease B decrease…
Answer this question and get it marked →A student heats hydrated copper(II) sulfate. The blue crystals change to a white powder. How can the student reverse this reaction? A Add anhydrous copper(II) sulfate to the white…
Answer this question and get it marked →Acidified aqueous potassium manganate(VII) is a purple solution. What does the (VII) in the name potassium manganate(VII) represent? A the charge on the potassium ion B the charge…
Answer this question and get it marked →Excess hydrochloric acid is added to aqueous sodium hydroxide containing thymolphthalein. Which colour change is observed? A blue to colourless B colourless to blue C red to…
Answer this question and get it marked →Information about four oxides, J, K, L and M, is listed. J releases ammonia when added to aqueous ammonium chloride. K reacts with aqueous sodium hydroxide. L is the oxide of a…
Answer this question and get it marked →Three methods of preparing salts are listed. 1 acid + metal 2 acid + metal carbonate 3 acid + metal oxide Which methods can be used to make copper(II) chloride? A 1, 2 and 3 B 1…
Answer this question and get it marked →Which set of elements shows the change from metallic to non-metallic character across a period of the Periodic Table? A beryllium → magnesium → calcium B fluorine → bromine →…
Answer this question and get it marked →The diagram shows the reaction that occurs when potassium is dropped into water. 2K + 2H2O → 2KOH + H2 lilac flame water potassium Which row is correct? density of pH of resulting…
Answer this question and get it marked →Which statement about bromine is correct? A Bromine has a greater density than chlorine. B Bromine is a gas at room temperature and pressure. C Bromine has a grey-black colour. D…
Answer this question and get it marked →What is a typical property of transition elements? A can act as catalysts B poor electrical conductivity C low melting point D low density
Answer this question and get it marked →Which description of elements in Group VIII of the Periodic Table is correct? A They are diatomic. B All atoms have eight outer electrons. C They have high melting points. D They…
Answer this question and get it marked →The flow chart shows some properties of four solid elements. Does it react with water to produce hydrogen? no yes element 1 Does it conduct electricity? no yes element 2 Does it…
Answer this question and get it marked →Which statement about copper or aluminium is correct? A Aluminium is more dense than copper. B Aluminium is less reactive than copper. C Copper has high ductility. D Copper has…
Answer this question and get it marked →Water from a reservoir flows to the water works where purification process 1 takes place followed by process 2. What are processes 1 and 2? process 1 process 2 A chlorination…
Answer this question and get it marked →Calcium reacts with cold water to produce hydrogen. Lead reacts slowly when heated in air to form an oxide but has almost no reaction with steam. Silver does not react with either…
Answer this question and get it marked →Which statement about rusting is correct? A Rust is anhydrous iron(II) oxide. B Oxygen is required for iron to rust. C Iron covered in grease rusts more quickly. D Iron rusts more…
Answer this question and get it marked →Which statements about the extraction of iron in a blast furnace are correct? 1 The temperature inside the blast furnace is increased by burning carbon. 2 Iron(III) oxide is…
Answer this question and get it marked →Which statements about water are correct? 1 Tap water has fewer impurities than distilled water. 2 Tap water will turn anhydrous cobalt(II) chloride pink. 3 The domestic water…
Answer this question and get it marked →Which substance is used by farmers to improve plant growth? A ammonium nitrate B phosphoric acid C potassium D sodium oxide
Answer this question and get it marked →Three air pollutants, X, Y and Z, are described. X is a toxic gas formed by the incomplete combustion of an alkane. Y is formed by decomposing vegetation and increases global…
Answer this question and get it marked →The displayed formula of an organic compound is shown. H H C C C H H H H To which homologous series does this compound belong? A alcohols B alkanes C alkenes D carboxylic acids
Answer this question and get it marked →Kerosene is one of the fractions of petroleum. What is kerosene used for? A jet fuel B petrol C road making D waxes
Answer this question and get it marked →A hydrocarbon P is cracked to make compound Q and hydrogen. Compound R is formed by the addition polymerisation of compound Q. To which homologous series do P, Q and R belong?…
Answer this question and get it marked →Which process involves combustion? (Some of the reaction products are not shown on the diagram.) B carbon dioxide A sugar + yeast ethanol in water D C ethene poly(ethene)
Answer this question and get it marked →What are the products when ethanoic acid reacts with aqueous sodium hydroxide? A carbon dioxide and water B carbon dioxide and sodium ethanoate C sodium ethanoate and hydrogen D…
Answer this question and get it marked →Which statements are correct? 1 The polymer of ethene is poly(ethane). 2 Monomers are small molecules. 3 Monomers join together to form polymers. A 1 and 3 B 1 only C 2 and 3 D 2…
Answer this question and get it marked →Dilute hydrochloric acid is titrated into a conical flask containing sodium hydroxide solution and a few drops of methyl orange indicator. Which piece of apparatus is used to add…
Answer this question and get it marked →What could be the melting point and boiling point of water containing a dissolved impurity? melting point boiling point / °C / °C A +3 96 B +3 104 C –3 96 D –3 104
Answer this question and get it marked →Element X burns in air to form an acidic gas that decolourises potassium manganate(VII). What is X? A carbon B nitrogen C magnesium D sulfur
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