2 1 A gas is released at point P in the apparatus shown. P damp universal indicator paper Which gas turns the damp universal indicator paper red most quickly? A ammonia, NH3 B chlorine, Cl 2 C hydrogen chloride, HCl D sulfur dioxide, SO2 2 A mixture is separated using the apparatus shown. mixture funnel filter paper What is the mixture? A aqueous copper(II) sulfate and aqueous sodium chloride B aqueous copper(II) sulfate and copper C copper and sulfur D ethanol and ethanoic acid 3 Which statement about paper chromatography is correct? A A solvent is needed to dissolve the paper. B Paper chromatography separates mixtures of solvents. C The solvent should cover the baseline. D The baseline should be drawn in pencil. © UCLES 2021 0620/21/M/J/21
3 4 Element X has 7 protons. Element Y has 8 more protons than X. Which statement about element Y is correct? A Y has more electron shells than X. B Y has more electrons in its outer shell than X. C Y is in a different group of the Periodic Table from X. D Y is in the same period of the Periodic Table as X. 5 A covalent molecule Q contains only six shared electrons. What is Q? A ammonia, NH3 B chlorine, Cl 2 C methane, CH4 D water, H2O 6 The arrangement of particles in each of two solids, S and T, are shown. S T What are S and T? S T A diamond silicon(IV) oxide B diamond sodium chloride C graphite silicon(IV) oxide D graphite sodium chloride © UCLES 2021 0620/21/M/J/21 [Turn over
4 7 Which statement about metals is correct? A Metals conduct electricity when molten because negative ions are free to move. B Metals conduct electricity when solid because positive ions are free to move. C Metals are malleable because the bonds between the atoms are weak. D Metals are malleable because the layers of ions can slide over each other. 8 Two elements, P and Q, are in the same period of the Periodic Table. P and Q react together to form an ionic compound. Part of the lattice of this compound is shown. P+ Q– Q– P+ Q– P+ P+ Q– Which statement is correct? A An ion of P has more electrons than an ion of Q. B Element P is non-metallic. C P is to the left of Q in the Periodic Table. D The formula of the compound is P4Q4. 9 2.56 g of a metal oxide, MO2, is reduced to 1.92 g of the metal, M. What is the relative atomic mass of M? A 48 B 96 C 128 D 192 10 In separate experiments, electricity was passed through concentrated aqueous sodium chloride and molten lead(II) bromide. What would happen in both experiments? A A halogen would be formed at the anode. B A metal would be formed at the cathode. C Hydrogen would be formed at the anode. D Hydrogen would be formed at the cathode. © UCLES 2021 0620/21/M/J/21
5 11 What is the ionic half-equation for the reaction that occurs at the cathode when molten lead(II) bromide is electrolysed? A Pb2+ + 2e– Pb B 2Br – Br2 + 2e– C Br2 + 2e– 2Br – D Pb Pb2+ + 2e– 12 The complete combustion of propane is exothermic. The equation for this reaction is shown. C3H8 + 5O2 3CO2 + 4H2O Which energy level diagram represents the complete combustion of propane? A B C3H8 + 5O2 3CO2 + 4H2O energy energy 3CO2 + 4H2O C3H8 + 5O2 progress of reaction progress of reaction C D 3CO2 + 4H2O C3H8 + 5O2 energy energy C3H8 + 5O2 3CO2 + 4H2O progress of reaction progress of reaction © UCLES 2021 0620/21/M/J/21 [Turn over
6 13 Which equation represents a reaction that takes place in a fuel cell? A C + O2 CO2 B 2H2 + O2 2H2O C CH4 + 2O2 CO2 + 2H2O D C3H8 + 5O2 3CO2 + 4H2O 14 When sulfur is heated it undergoes a ......1...... change as it melts. Further heating causes the sulfur to undergo a ......2...... change and form sulfur dioxide. Which words complete gaps 1 and 2? 1 2 A chemical chemical B chemical physical C physical chemical D physical physical 15 Four statements about the effect of increasing temperature on a reaction are shown. 1 The activation energy becomes lower. 2 The particles move faster. 3 There are more collisions between reacting particles per second. 4 There are more collisions which have energy greater than the activation energy. Which statements are correct? A 1, 2 and 3 B 1, 3 and 4 C 2, 3 and 4 D 2 and 3 only © UCLES 2021 0620/21/M/J/21
7 16 An example of a redox reaction is shown. Zn + Cu2+ Zn2+ + Cu Which statement about the reaction is correct? A Zn is the oxidising agent and it oxidises Cu2+. B Zn is the oxidising agent and it reduces Cu2+. C Zn is the reducing agent and it oxidises Cu2+. D Zn is the reducing agent and it reduces Cu2+. 17 Which statement about a reaction in equilibrium is correct? A Both the forward and the backward reactions are proceeding at the same rate. B Neither the forward nor the backward reaction is proceeding. C The amount of product present is no longer affected by changes in temperature or pressure. D The amount of product present is only affected by a change in pressure. 18 Element X forms an oxide, XO, that neutralises sulfuric acid. Which row describes X and XO? element X nature of oxide, XO A metal acidic B metal basic C non-metal acidic D non-metal basic 19 Copper(II) sulfate is prepared by adding excess copper(II) oxide to warm dilute sulfuric acid. Which purification methods are used to obtain pure solid copper(II) sulfate from the reaction mixture? 1 crystallisation 2 filtration 3 chromatography 4 distillation A 1 and 4 B 1 and 2 C 2 and 3 D 3 and 4 © UCLES 2021 0620/21/M/J/21 [Turn over
8 20 Some reactions of element M are shown. burn add water element M oxide of M solution add to purple acidified add blue litmus potassium manganate(VII) goes colourless goes red What is element M? A carbon B iron C magnesium D sulfur 21 In which equation is the underlined reactant acting as a base? A CH3COO– + H3O+ CH3COOH + H2O B NH4+ + OH– NH3 + H2O C CO2 + 2H2O H3O+ + HCO3– D H+ + OH– H2O 22 Why is helium used to fill balloons? A Helium is monoatomic. B Helium is in Group VIII of the Periodic Table. C Helium has a full outer electron shell. D Helium is less dense than air. 23 Which elements in the table are transition elements? element property E forms E3+ ions only F forms F+ and F2+ ions G forms only white salts H used in catalytic converters A E and G B E and H C F and G D F and H © UCLES 2021 0620/21/M/J/21
9 24 Element R forms a covalent compound R2Si with silicon. Which row describes R? metallic or group number in non-metallic character the Periodic Table A metallic II B metallic VI C non-metallic II D non-metallic VI 25 Some properties of metal J are listed. ● J does not react with cold water. ● J reacts with dilute hydrochloric acid. ● No reaction occurs when the oxide of J is heated with carbon. What is J? A copper B iron C magnesium D sodium 26 Some metal nitrates and carbonates decompose when heated strongly. Metal Q has a nitrate that decomposes to give a salt and a colourless gas only. The carbonate of metal Q does not decompose when heated with a Bunsen burner. What is metal Q? A calcium B copper C sodium D zinc © UCLES 2021 0620/21/M/J/21 [Turn over
10 27 Which substances are used in the extraction of aluminium? A bauxite and cryolite B bauxite and hematite C cryolite and zinc blende D hematite and zinc blende 28 Different types of steel alloys are manufactured by changing the percentage of carbon in the alloy. The properties of four steel alloys are shown. alloy percentage of strength of hardness of mixture carbon in the alloy the alloy the alloy 1 0.00 to 0.20 high low 2 0.21 to 0.30 high medium 3 0.31 to 0.40 medium high 4 0.41 to 1.50 low high What are the properties of the steel alloy containing 0.23% of carbon? strength hardness A high low B low high C high medium D medium high 29 Ammonia is made by reacting nitrogen with hydrogen in the Haber process. The equation for the process is shown. N2 + 3H2 2NH3 Which changes in reaction conditions would produce a greater yield of ammonia? 1 adding more iron catalyst 2 increasing the reaction pressure 3 increasing the particle size of the iron catalyst A 1 only B 2 only C 1 and 2 D 2 and 3 © UCLES 2021 0620/21/M/J/21
11 30 Which process removes carbon dioxide from the atmosphere? A combustion of fossil fuels B fermentation C photosynthesis D respiration 31 Which catalyst is used in the Contact process? A calcium oxide B iron C manganese(II) oxide D vanadium(V) oxide 32 A white solid Z reacts with dilute hydrochloric acid to produce a gas. The same gas is produced when compound Z is heated strongly. What is Z? A calcium B calcium carbonate C calcium hydroxide D calcium oxide 33 What is the structure of butanoic acid? A CH3CH2CO2H B CH3CH2CH2CO2H C CH3CH2CH2CH2CO2H D CH3CH2CH2CO2CH3 © UCLES 2021 0620/21/M/J/21 [Turn over