Chemistry 0620/11 May/June 2025: question paper and mark scheme

Question

Which process happens when water vapour changes to rain? A boiling B condensing C evaporating D freezing

Question

The diagrams show the arrangement of particles in three different states of matter. state 1 state 2 state 3 Which row describes the change in energy of the particles and in particle motion for the given change in state? change in state energy of particles particle motion A 1→2 decreases decreases B 2→1 decreases increases C 3→1 increases increases D 1→3 increases decreases

Question

An atom of element Q contains 19 electrons, 19 protons and 20 neutrons. What is Q? A calcium B potassium C strontium D yttrium

Question

Which part of an atom has a relative mass of 1 and a relative charge of 0? A electron B neutron C nucleus D proton

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Which row identifies the number of electrons, neutrons and protons in a particle which is an isotope of 115 B? electrons neutrons protons A 5 5 5 B 5 6 5 C 6 5 6 D 6 6 6

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Which statements about potassium iodide are correct? 1 It is formed from potassium anions and iodide cations. 2 It is a good electrical conductor when molten or in aqueous solution. 3 Potassium atoms share electrons with iodine atoms. A 1 and 3 B 1 only C 2 and 3 D 2 only

Question

Which substances contain one or more shared pairs of electrons? 1 argon 2 methane 3 iron(III) oxide 4 chlorine A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

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Which substance has a giant covalent structure at room temperature and pressure? A ammonia B carbon dioxide C diamond D water

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Which row shows the correct formula for the named substance? substance formula A cobalt(II) chloride Cu2Cl B sodium carbonate Na2CO3 C xenon Xe2 D ammonium sulfate NH4SO4

Question

The equation shows the thermal decomposition of magnesium carbonate. MgCO3 → MgO + CO2 [Mr: MgCO3, 84] Which mass of magnesium oxide is formed when 21.0 g of magnesium carbonate is completely decomposed? A 1.9 g B 4.0 g C 10.0 g D 40.0 g

Question

Concentrated aqueous sodium chloride is electrolysed using inert electrodes. What is the main product formed at the positive electrode (anode)? A chlorine B hydrogen C oxygen D sodium

Question

A hydrogen–oxygen fuel cell uses 630 dm3 of oxygen. The oxygen for the reaction is extracted from clean, dry air. What is the minimum volume of clean, dry air needed to provide this volume of oxygen? A 788 dm3 B 808 dm3 C 3000 dm3 D 3316 dm3

Question

Three statements about energy changes in chemical reactions are listed. 1 In an endothermic reaction, the temperature of the surroundings increases. 2 In an exothermic reaction, thermal energy is taken in from the surroundings. 3 In the reaction pathway diagram for an exothermic reaction, the energy level of the products is lower than the energy level of the reactants. Which statements are correct? A 1 and 2 B 1 only C 2 and 3 D 3 only

Question

When a small piece of a Group I metal is placed into a large beaker of cold water, a reaction occurs. Four statements about this reaction are listed. 1 The metal melts. 2 Hydrogen is produced. 3 Steam is produced. 4 The pH of the solution increases. Which statements about this reaction describe a physical change? A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

Question

The equation for the decomposition of hydrogen peroxide is shown. 2H2O2 → 2H2O + O2 The reaction is exothermic. When a small amount of a catalyst is added, the oxygen is produced more quickly. Which statement about the catalyst is correct? A The catalyst makes the reaction more exothermic. B The mass of catalyst is the same before and after the reaction. C The catalyst increases the final volume of oxygen produced. D All of the catalyst is used up in the reaction.

Question

The equation for the reaction between copper(II) oxide and carbon is shown. 2CuO + C → 2Cu + CO2 Which statement about this reaction is correct? A CuO is reduced. B CO2 is oxidised. C Cu is oxidised. D C is reduced.

Question

Which row gives the colours observed when thymolphthalein and methyl orange are added separately to the named solution? colour with colour with solution thymolphthalein methyl orange A dilute HCl colourless yellow B dilute HCl blue red C aqueous NaOH colourless red D aqueous NaOH blue yellow

Question

A mixture of two substances, R and S, is heated gently. The damp red litmus paper turns blue. damp red litmus paper R and S gentle heat What are R and S? R S A a basic oxide ammonium chloride B a basic oxide sodium nitrate C an acidic oxide ammonium chloride D an acidic oxide sodium nitrate

Question

Which reactants are used to make the salt copper(II) sulfate? A dilute acid + alkali B dilute acid + metal carbonate C dilute acid + metal D dilute acid + non-metal oxide

Question

Which statement about the Periodic Table is correct? A The elements are arranged in order of increasing relative atomic mass. B The reactivity of the elements in Group I and in Group VII increases as the groups are descended. C Elements in the same period have similar chemical properties. D Elements in Group II form ions with a 2+ charge.

Question

Part of the Periodic Table is shown. Which element shows the most metallic character? A B C D

Question

E is an element from Group I of the Periodic Table. Two properties of E are listed. ● It has a higher melting point than caesium. ● It has a lower density than sodium. What is the identity of E? A lithium B potassium C rubidium D francium

Question

An equation for the displacement reaction between aqueous halogen, X2, and aqueous halide ions, Y–, is shown. X2(aq) + 2Y–(aq) → 2X–(aq) + Y2(aq) Which row identifies X2 and Y– and explains why the reaction takes place? X2 Y– explanation A chlorine iodide chlorine is less reactive than iodine B chlorine iodide chlorine is more reactive than iodine C iodine chloride chlorine is less reactive than iodine D iodine chloride chlorine is more reactive than iodine

Question

Some information about an element is shown. melting point / °C 1555 boiling point / °C 2963 colour of oxide brown use of element as a catalyst What is the position of this element in the Periodic Table? A Group I B Group VII C Group VIII D transition elements

Question

The table shows the observations when four metals, Q, R, S and T, are added separately to cold water and to dilute hydrochloric acid. observation with observation with metal cold water dilute hydrochloric acid Q slow fizzing fizzing R no reaction fizzing S no reaction no reaction T vigorous fizzing vigorous fizzing Which row gives the order of reactivity of the metals? least most reactive reactive A S Q R T B T R Q S C S R Q T D T Q R S

Question

Magnesium is reacted separately with dilute sulfuric acid and with steam. Which row correctly identifies if hydrogen is formed as a product in each reaction? reaction with reaction with dilute sulfuric acid steam A key B = hydrogen is formed C = hydrogen is not formed D

Question

Which statements about aluminium are correct? 1 It is more reactive than calcium. 2 The main ore of aluminium is bauxite. 3 It can be extracted from its oxide using carbon. 4 Brass is an alloy of aluminium and copper. A 1 and 2 B 1 and 3 C 2 only D 3 and 4

Question

Steel is a mixture of iron and one or more other elements. The table gives some information about three common types of steel. elements type of steel properties added to iron 1 high-carbon steel carbon only strong, brittle and corrodes 2 low-carbon steel carbon only soft, easily shaped and corrodes slowly 3 stainless steel carbon, chromium hard and resistant and nickel to corrosion Which rows identify a type of steel that is suitable to make cutlery? A 1 and 2 B 1 only C 2 and 3 D 3 only

Question

The diagram shows an experiment to investigate the corrosion of iron. P Q greased iron iron air water What happens to the water level in tubes P and Q? tube P tube Q A rises falls B no change rises C falls rises D no change no change

Question

Fertilisers are used to provide the three elements needed for improved plant growth. Which two compounds would provide all three of these elements? A ammonium nitrate and calcium phosphate B ammonium nitrate and potassium sulfate C potassium nitrate and calcium phosphate D potassium phosphate and potassium sulfate

Question

Which substances can be used to detect the presence of water? 1 anhydrous cobalt(II) chloride 2 anhydrous copper(II) sulfate 3 litmus 4 methyl orange A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

Question

What is produced by the incomplete combustion of methane? A carbon monoxide B hydrogen C lead compounds D sulfur dioxide

Question

Which row identifies compounds in the same homologous series? chemical functional properties group A different different B different same C similar different D similar same

Question

The molecular formula of compound Z is C4H10. Which row identifies the substance that reacts with Z and describes the type of reaction that occurs? substance type of reaction A chlorine addition B chlorine substitution C steam addition D steam substitution

Question

Which list shows the fractions obtained from the fractional distillation of petroleum, in order of increasing boiling point? A bitumen → diesel oil → fuel oil → lubricating oil B diesel oil → gasoline → naphtha → kerosene C gasoline → naphtha → kerosene → diesel oil D kerosene → lubricating oil → naphtha → refinery gas

Question

Three statements about cracking of larger alkane molecules are listed. 1 Cracking produces petrol for cars. 2 Cracking only produces short-chain alkenes. 3 Cracking produces alkenes used to make polymers. Which statements are correct? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

Question

Some words used to describe organic compounds are listed. 1 hydrocarbon 2 monomer 3 saturated 4 unreactive Which words describe ethene? A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

Question

A student measures 25.00 cm3 of dilute hydrochloric acid accurately. Which piece of apparatus is most suitable? A beaker B measuring cylinder C burette D dropping pipette

Question

Excess solid magnesium oxide is added to dilute nitric acid. Which separation technique is used to remove the excess solid magnesium oxide after the reaction finishes? A chromatography B crystallisation C distillation D filtration

Question

Four different aqueous metal nitrates are tested separately with aqueous sodium hydroxide, with dilute sulfuric acid and with a flame test. Which row shows the correct set of results for the named aqueous metal nitrate? aqueous with aqueous with dilute flame test metal nitrate sodium hydroxide sulfuric acid A sodium nitrate no visible change white precipitate yellow flame B copper(II) nitrate blue precipitate no visible change blue-green flame C barium nitrate white precipitate no visible change blue-green flame D calcium nitrate no visible change white precipitate yellow flame 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.).