Chemistry 0620/12 May/June 2020: question paper and mark scheme

Question

Each rectangle shows the arrangement of particles in each of the three states of matter. X, Y and Z represent the processes needed to change from one state to another. X Y Z What are the processes X, Y and Z? X Y Z A evaporating subliming condensing B evaporating subliming freezing C subliming evaporating condensing D subliming evaporating freezing

Question

Which piece of apparatus is used to measure 25.0 cm3 of aqueous sodium hydroxide? A B C D

Question

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

Question

The diagram shows the electronic structure of a particle with a nucleon number (mass number) of 40. e e e e e e e e e e e 40 e e e e e e e The table shows the suggestions that three students, 1, 2 and 3, made to identify the particle. student 1 2 3 particle Ar Cl Ca2+ Which students are correct? A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

Question

The Group I element sodium forms an ionic bond with the Group VII element fluorine. Which two ions are produced? A Na+ and F+ B Na+ and F– C Na– and F– D Na– and F+

Question

The electronic structures of two atoms, P and Q, are shown. P Q P and Q combine together to form a compound. What is the type of bonding in the compound and what is the formula of the compound? type of bonding formula A ionic PQ B ionic PQ2 C covalent PQ2 D covalent PQ

Question

Graphite is a macromolecule. Which statements about graphite are correct? 1 Carbon atoms form four covalent bonds with neighbouring atoms. 2 There are free electrons between layers of carbon atoms. 3 Graphite is a useful lubricant. 4 Graphite is a good conductor of electricity. A 1 and 2 B 1, 3 and 4 C 2, 3 and 4 D 3 and 4 only

Question

Aluminium oxide has the formula Al 2O3. Which statement about aluminium oxide is correct? A 2 g of aluminium atoms are combined with 3 g of oxygen atoms. B 2 g of aluminium atoms are combined with 3 g of oxygen molecules. C Aluminium oxide has a relative formula mass of 102. D Pure aluminium oxide contains a higher mass of oxygen than of aluminium.

Question

Dilute sulfuric acid is electrolysed using carbon electrodes. Which row shows the products formed at each electrode? anode cathode A hydrogen oxygen B hydrogen sulfur C oxygen hydrogen D oxygen sulfur

Question

Which fuel does not rely on combustion to release energy? A gasoline B hydrogen C methane D uranium

Question

The energy level diagram shows the energy of the reactants and products in a chemical reaction. reactants energy products progress of reaction Which row correctly describes the energy change and the type of reaction shown? description of type of reaction energy change A energy is given out endothermic to the surroundings B energy is given out exothermic to the surroundings C energy is taken in from endothermic the surroundings D energy is taken in from exothermic the surroundings

Question

Which list contains only chemical changes? A melting, evaporating, dissolving B rusting, freezing, subliming C neutralisation, polymerisation, combustion D boiling, condensing, distillation

Question

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 increase increase C increase decrease increase D increase increase decrease

Question

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 white ash D white anhydrous copper(II) sulfate turning blue when water is added

Question

When heated strongly, silicon(IV) oxide reacts with carbon. SiO2 + 2C → Si + 2CO Which term describes what happens to silicon(IV) oxide? A thermal decomposition B neutralisation C oxidation D reduction

Question

The graph shows how the pH of a solution changes as an acid is added to an alkali. acid + alkali → salt + water Which letter represents the area of the graph where both acid and salt are present? A 14 B C pH 7 D 0 volume of acid added

Question

Element G is a metal in Group I of the Periodic Table and element H is a non-metal in Group VII. Both of these elements form oxides. Which statement about their oxides is correct? A Both oxides are acidic. B Both oxides are basic. C The oxide of G is acidic and the oxide of H is basic. D The oxide of H is acidic and the oxide of G is basic.

Question

The apparatus shown is used to prepare aqueous copper(II) sulfate. filter paper stirrer excess of solid X solid X Y aqueous copper(II) sulfate heat What are X and Y? X Y A copper aqueous iron(II) sulfate B copper(II) chloride dilute sulfuric acid C copper(II) oxide dilute sulfuric acid D sulfur aqueous copper(II) chloride

Question

An aqueous solution of a compound M is tested. The results are shown. ● It gave a lilac colour in a flame test. ● It produced a white precipitate when tested with acidified barium nitrate. What is M? A copper(II) chloride B copper(II) sulfate C potassium carbonate D potassium sulfate

Question

The character of the elements and charges on the ions of the elements change across the Periodic Table. Which row describes the elements on the left of the table and the elements on the right? elements on the left elements on the right character charge on ion character charge on ion A metallic positive non-metallic negative B metallic negative non-metallic positive C non-metallic positive metallic negative D non-metallic negative metallic positive

Question

Which statement about Group I and Group VII elements is correct? A Group VII elements are monoatomic non-metals. B Lithium is more reactive with water than caesium. C The melting points of Group I metals increase down the group. D Potassium bromide reacts with chlorine to produce an orange solution.

Question

The properties of the element titanium, Ti, can be predicted from its position in the Periodic Table. Which row identifies the properties of titanium? can be used conducts electricity forms coloured has low density as a catalyst when solid compounds A B C D

Question

Which diagram shows a mixture of noble gases? A B C D

Question

Which property is shown by all metals? A They are extracted from their ores by heating with carbon. B They conduct electricity. C They form acidic oxides. D They react with hydrochloric acid to form hydrogen.

Question

The reactions of four metals, W, X, Y and Z, are shown. metal observations W reacts with steam and hydrochloric acid but not cold water X reacts with hydrochloric acid but not with steam or cold water Y reacts with hydrochloric acid and cold water Z does not react with hydrochloric acid What is the order of reactivity for metals W, X, Y and Z? most least reactive reactive A Y W X Z B Y X W Z C Z W X Y D Z X W Y

Question

Molten iron from the blast furnace contains impurities. The process of turning the impure iron into steel involves blowing oxygen into the molten iron and adding calcium oxide. What are the reasons for blowing in oxygen and adding calcium oxide? blowing in oxygen adding calcium oxide A carbon is removed by reacting with oxygen reacts with acidic impurities making slag B carbon is removed by reacting with oxygen reacts with slag and so removes it C iron reacts with the oxygen reacts with acidic impurities making slag D iron reacts with the oxygen reacts with slag and so removes it

Question

Which statement about mild steel explains why it is a good choice for car bodies? A It is cheap and strong. B It is a good conductor. C It is low density. D It resists rusting.

Question

Which statement about pure water is not correct? A It condenses at 100 °C. B It freezes at 0 °C. C It turns cobalt(II) chloride paper blue. D It turns anhydrous copper(II) sulfate blue.

Question

Which compounds both contribute to ‘acid rain’? A carbon monoxide and lead compounds B carbon monoxide and oxides of nitrogen C oxides of nitrogen and sulfur dioxide D sulfur dioxide and lead compounds

Question

The diagrams show experiments to investigate rusting of iron nails. 1 2 3 layer of oil tap salt boiled water water water In which test-tubes do the nails rust? A 1 only B 1 and 2 only C 1 and 3 only D 1, 2 and 3

Question

Which bag is not suitable for use as a fertiliser? A B C D ammonium potassium sodium sodium nitrate sulfate chloride phosphate NH4NO3 K2SO4 NaCl Na3PO4

Question

X is a colourless greenhouse gas. It is a waste product from digestion in animals. It is generally unreactive, but it can be burnt. What is X? A carbon dioxide B methane C nitrogen D sulfur dioxide

Question

The list shows four methods that were suggested for the formation of carbon dioxide. 1 cracking methane using steam 2 action of heat on a carbonate 3 complete combustion of methane 4 reaction of a carbonate with oxygen Which methods would result in the production of carbon dioxide? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

Question

A student suggests three uses of calcium carbonate (limestone). 1 manufacture of cement 2 manufacture of iron 3 treating alkaline soils Which suggestions are correct? A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

Question

Which list shows the fractions obtained from distilling 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

The structures of four compounds are shown. 1 2 3 4 H H H H H H H H H H C C H C C H C C O H H C C C H H H H H H H H H H Which compounds are members of the same homologous series? A 1 and 2 only B 1 and 4 C 1, 2 and 3 D 2 and 4

Question

Increasing the number of atoms in one molecule of a hydrocarbon increases the amount of energy released when it burns. What is the correct order? less energy more energy released released A ethene ethane methane B ethene methane ethane C methane ethane ethene D methane ethene ethane

Question

Which statement about alcohols is correct? A Alcohols and carboxylic acids have the same functional group. B Ethanoic acid is produced from the reduction of ethanol. C Ethanol is produced in an addition reaction between ethene and hydrogen. D Water is produced from the combustion of alcohols.

Question

An organic compound, P, reacts with zinc to produce a gas, Q. What are P and Q? P Q A ethanoic acid carbon dioxide B ethanoic acid hydrogen C ethanol carbon dioxide D ethanol hydrogen

Question

Which substances are natural polymers? 1 proteins 2 carbohydrates 3 nylon 4 poly(ethene) A 1 and 2 B 1 and 3 C 2 and 3 D 3 and 4 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 89–103 104 105 106 107 108 109 110 111 112 114 116 actinoids Fr Ra Rf Db Sg Bh Hs Mt Ds Rg Cn Fl Lv francium radium rutherfordium dubnium seaborgium bohrium hassium meitnerium darmstadtium roentgenium copernicium flerovium livermorium – – – – – – – – – – – – – 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.).