Chemistry 0620/11 May/June 2023: question paper and mark scheme

Question

The diagram shows the result of dropping a purple crystal into water. after water five hours purple solution purple crystal Which processes take place in this experiment? chemical diffusing dissolving reaction A B C D

Question

Which row about elements, mixtures and compounds is correct? metallic non-metallic mixture compound element element A copper methane brass sulfur B brass sulfur copper methane C copper sulfur brass methane D brass methane copper sulfur

Question

What are the relative charge and relative mass of an electron? relative relative charge mass A 0 1 1 B 0 2000 C –1 1 –1 1 D 2000

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The atomic structures of four particles, W, X, Y and Z, are shown. electrons neutrons protons W 2 2 2 X 2 2 3 Y 2 3 2 Z 3 2 3 Which particles are isotopes of the same element? A W and X B W and Y C X and Y D X and Z

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Which row shows the properties of an ionic compound? electrical melting point conductivity / °C of solid A good 98 B good 3652 C poor 78 D poor 801

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Which row describes the formation of single covalent bonds in methane? A atoms share a pair of electrons both atoms gain a noble gas electronic structure B atoms share a pair of electrons both atoms have the same number of electrons in their outer shell C electrons are transferred from one both atoms gain a atom to another noble gas electronic structure D electrons are transferred from one both atoms have the same number atom to another of electrons in their outer shell

Question

Which equation represents the neutralisation of nitric acid using sodium hydroxide? A NaOH(aq) + HNO3(aq) → NaNO3(aq) + H2O(l) B NaOH(aq) + HNO3(aq) → NaNO3(l) + H2O(l) C NaOH(l) + HNO3(l) → NaNO3(l) + H2O(aq) D NaOH(l) + HNO3(l) → NaNO3(l) + H2O(l)

Question

What is the relative formula mass of ammonium nitrate, NH4NO3? A 80 B 108 C 122 D 150

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Concentrated aqueous sodium chloride is electrolysed using inert electrodes. Gases X and Y are produced at the electrodes shown. X Y concentrated aqueous sodium chloride – + – + What are X and Y? X Y A chlorine hydrogen B hydrogen chlorine C hydrogen oxygen D oxygen hydrogen

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Which statement about hydrogen fuel cells is correct? A Hydrogen fuel cells do not produce carbon dioxide. B Hydrogen fuel cells do not need oxygen. C The waste from a hydrogen fuel cell is an acidic gas. D The reaction in a fuel cell is endothermic.

Question

A reaction pathway diagram is shown. products energy reactants progress of reaction Which statement about this reaction is correct? A The reaction rate increases during the reaction. B The reaction is endothermic. C The reaction transfers thermal energy to the surroundings. D The temperature of the surroundings increases.

Question

Lumps of calcium carbonate react with dilute hydrochloric acid as shown. CaCO3 + 2HCl → CaCl 2 + H2O + CO2 Which change in conditions decreases the rate of the reaction? A increasing the concentration of the acid B increasing the volume of the acid C increasing the size of the lumps of calcium carbonate D increasing the temperature

Question

Solid copper(II) sulfate exists in two different forms, anhydrous and hydrated. One of these forms is blue and the other is white. The change between these two forms is reversible. blue form white form What is the blue form and how is the change from the blue form to the white form brought about? change to blue form white form A anhydrous add water B anhydrous heat C hydrated add water D hydrated heat

Question

Four redox equations and statements about the equations are shown. reaction statement 1 C + O2 → CO2 carbon is oxidised 2 CO2 + C → 2CO carbon dioxide is oxidised 3 CO2 + C → 2CO carbon is oxidised 4 Fe2O3 + 3CO → 2Fe + 3CO2 iron(III) oxide is oxidised Which statements about the equations are correct? A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

Question

Sodium hydroxide forms an alkaline solution with a pH of 14. Which indicator turns yellow when added to this solution? A litmus B methyl orange C thymolphthalein D universal indicator

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Which row identifies an acidic oxide and a basic oxide? acidic oxide basic oxide A CaO CuO B CaO SO2 C CO2 CuO D CO2 SO2

Question

A student makes aqueous copper(II) chloride by adding excess copper(II) carbonate to dilute hydrochloric acid. What is the next step in the method in the formation of solid copper(II) chloride? A crystallisation B evaporation C filtration D titration

Question

Which statements about the trends across a period of the Periodic Table are correct? 1 Aluminium is more metallic than sodium. 2 Beryllium is more metallic than carbon. 3 Boron is more metallic than lithium. 4 Magnesium is more metallic than silicon. A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

Question

Which row shows the trend in melting point, density and reactivity as Group I is descended? melting point density reactivity A increases decreases decreases B decreases increases increases C increases decreases increases D decreases increases decreases

Question

Which row describes a similarity and a difference between chlorine and bromine? similarity difference A both are gases at room chlorine and bromine temperature and pressure have different colours B both exist as chlorine is more diatomic molecules dense than bromine C both have atoms with only bromine will react with seven outer-shell electrons aqueous sodium chloride D both react with aqueous chlorine is more reactive potassium iodide than bromine

Question

Which statement describes transition elements? A They have high densities and high melting points. B They have high densities and low melting points. C They have low densities and high melting points. D They have low densities and low melting points.

Question

Which diagram shows the electronic structure of a noble gas? A B C D

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Which gas is made when powdered zinc is added to dilute hydrochloric acid? A carbon dioxide B chlorine C hydrogen D oxygen

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Which metal is used in aircraft manufacture because it has a low density? A aluminium B copper C iron D potassium

Question

The diagram represents the structure of a solid. Which solids does the diagram represent? brass graphite sodium chloride A B C D

Question

Three students, X, Y and Z, are told that solid P reacts with dilute acids and also conducts electricity. The table shows the students’ suggestions about the identity of P. X Y Z copper iron graphite Which students are correct? A X, Y and Z B X only C Y only D Z only

Question

Which substances in the air are needed for iron to rust? A oxygen and water B oxygen only C water and carbon dioxide D water only

Question

Part of the reactivity series of metals is shown. metal P decreasing reactivity carbon metal Q metal R Which row shows how each metal is extracted from its ore? metal P metal Q metal R A electrolysis of molten ore electrolysis of molten ore heating with carbon B heating with carbon electrolysis of molten ore electrolysis of molten ore C heating with carbon heating with carbon electrolysis of molten ore D electrolysis of molten ore heating with carbon heating with carbon

Question

Several processes are used to treat domestic water. Which row identifies a reason for the given process? process reason A chlorination removes impurities B filtration removes insoluble solids C sedimentation removes soluble solids D use of carbon kills bacteria

Question

Which pair of compounds make an NPK fertiliser? A ammonium sulfate and potassium phosphate B calcium hydroxide and ammonium nitrate C calcium phosphate and potassium chloride D potassium nitrate and ammonium sulfate

Question

Some information about gas X is listed. ● It is not present in clean, dry air. ● It is not a cause of respiratory problems. ● It is responsible for global warming. What is X? A carbon dioxide B carbon monoxide C methane D nitrogen dioxide

Question

Part of the structure of a molecule of vitamin A is shown. H H C H H H C C C C C O H H H H Which statements about this part of the structure are correct? 1 It is saturated. 2 There are two alkene groups. 3 The structure shows a carboxylic acid. A 1 and 3 B 1 only C 2 and 3 D 2 only

Question

The fractional distillation of petroleum is shown. Which fraction contains hydrocarbons with the longest chain length? fuel gas A B C D petroleum bitumen

Question

Which equation represents the cracking of an alkane? A 3C2H4 → C6H12 B C6H12 + H2 → C6H14 C C6H14 → 6C + 7H2 D C6H14 → C2H4 + C4H10

Question

Which statements about ethanol are correct? 1 Ethanol is made by reacting steam with ethene at 300 °C. 2 Ethanol is made by fermentation at 55 °C. 3 Ethanol burns to produce carbon dioxide and water. 4 Ethanol contains a carbon–carbon double bond. A 1 and 2 B 1 and 3 C 2 and 3 D 3 and 4

Question

Which substances react with aqueous ethanoic acid to form a gas? 1 magnesium 2 magnesium carbonate 3 magnesium oxide A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

Question

In reaction R, 2000 molecules of CH2=CH2 react to form a single molecule X only. 2000 CH2=CH2 → X Which terms describe reaction R, CH2=CH2 and X? reaction R CH2=CH2 X A addition monomer polymer B addition polymer monomer C substitution monomer polymer D substitution polymer monomer

Question

The concentration of acids and alkalis can be determined by titration. Which pieces of equipment are needed to perform a titration? 1 2 3 4 A 1 and 2 B 1 and 3 C 2 and 3 D 2 and 4

Question

Which process is used to produce drinking water from sea water? A crystallisation B distillation C filtration D chlorination

Question

The results of two separate tests on a white solid X are shown. test result add dilute nitric acid effervescence add aqueous a gas is formed which turns sodium hydroxide and warm damp red litmus paper blue What is X? A aluminium carbonate B aluminium nitrate C ammonium carbonate D ammonium nitrate The Periodic Table of Elements Group I II III IV V VI VII VIII 1 2 H He hydrogen helium Key 1 4 3 4 atomic number 5 6 7 8 9 10 Li Be atomic symbol B C N O F Ne lithium beryllium name boron carbon nitrogen oxygen fluorine neon 7 9 relative atomic mass 11 12 14 16 19 20 11 12 13 14 15 16 17 18 Na Mg Al Si P S Cl Ar sodium magnesium aluminium silicon phosphorus sulfur chlorine argon 23 24 27 28 31 32 35.5 40 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr potassium calcium scandium titanium vanadium chromium manganese iron cobalt nickel copper zinc gallium germanium arsenic selenium bromine krypton 39 40 45 48 51 52 55 56 59 59 64 65 70 73 75 79 80 84 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe rubidium strontium yttrium zirconium niobium molybdenum technetium ruthenium rhodium palladium silver cadmium indium tin antimony tellurium iodine xenon 16 85 88 89 91 93 96 – 101 103 106 108 112 115 119 122 128 127 131 55 56 57–71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 lanthanoids Cs Ba Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn caesium barium hafnium tantalum tungsten rhenium osmium iridium platinum gold mercury thallium lead bismuth polonium astatine radon 133 137 178 181 184 186 190 192 195 197 201 204 207 209 – – – 87 88 89–103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 actinoids Fr Ra Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og francium radium rutherfordium dubnium seaborgium bohrium hassium meitnerium darmstadtium roentgenium copernicium nihonium flerovium moscovium livermorium tennessine oganesson – – – – – – – – – – – – – – – – – 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 lanthanoids La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu lanthanum cerium praseodymium neodymium promethium samarium europium gadolinium terbium dysprosium holmium erbium thulium ytterbium lutetium 139 140 141 144 – 150 152 157 159 163 165 167 169 173 175 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 actinoids Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr actinium thorium protactinium uranium neptunium plutonium americium curium berkelium californium einsteinium fermium mendelevium nobelium lawrencium – 232 231 238 – – – – – – – – – – – The volume of one mole of any gas is 24 dm3 at room temperature and pressure (r.t.p.).