Chemistry 0620/13 May/June 2020: question paper and mark scheme

Question

Descriptions of the three states of matter are shown. particle particle type of motion separation arrangement 1 small random move past each other at low speed 2 large random rapid motion in straight lines 3 small regular vibration Which row is correct? 1 2 3 A gas liquid solid B liquid solid gas C liquid gas solid D solid gas liquid

Question

Which piece of apparatus is used to measure 13.7 cm3 of dilute hydrochloric acid? A balance B burette C conical flask D pipette

Question

Ethanol can be made by fermentation of sugar, using yeast. This produces a mixture of ethanol and water. How is ethanol separated from this mixture? A Filter the mixture. B Heat to evaporate the water. C Heat to evaporate most of the water, and allow the ethanol to crystallise. D Distil the mixture using a fractionating column.

Question

The structure of an atom of element X is shown. key 5p = electron 6n n = neutron p = proton What is element X? A boron B carbon C sodium D sulfur

Question

Which statement about the bonding in sodium chloride is correct? A Pairs of electrons are shared between the sodium and chlorine atoms. B Chlorine atoms give electrons to sodium atoms to form positive and negative ions. C There is covalent bonding between sodium and chlorine. D The positive and negative ions have noble gas electronic structures.

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

Diamond and graphite are macromolecules. Which statement is correct for both diamond and graphite? A They act as lubricants. B They conduct electricity. C They have high melting points. D They are very hard.

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

Which statement about electrolysis is not correct? A Bromine is produced at the cathode in the electrolysis of molten lead bromide. B Electrolysis is the breakdown of a substance by electricity. C Hydrogen is one of the products in the electrolysis of concentrated aqueous sodium chloride. D Platinum is used as an inert electrode.

Question

Which statements about 235U are correct? 1 It is a radioactive isotope. 2 It burns in air to produce greenhouse gases. 3 It is used as an energy source. A 1 only B 1 and 3 only C 1, 2 and 3 D 2 and 3 only

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

In which tube is a physical change taking place? A B C D water water dilute dilute hydrochloric hydrochloric acid acid iron nail magnesium calcium sodium carbonate chloride

Question

Magnesium is reacted with dilute hydrochloric acid of the same concentration in four experiments using different conditions. Which reaction finished in the shortest time? A 2 g of magnesium powder in 50 cm3 of dilute HCl at 45 °C B 2 g of magnesium powder in 50 cm3 of dilute HCl at 50 °C C 2 g of magnesium ribbon in 50 cm3 of dilute HCl at 45 °C D 2 g of magnesium ribbon in 50 cm3 of dilute HCl at 50 °C

Question

Blue copper(II) sulfate crystals are heated in air until they turn into a white powder. The powder is allowed to cool and after a few days it starts to turn blue. Why does the white powder start to turn blue? A Carbon dioxide in the air reacts with the powder to form copper(II) carbonate. B The powder reacts with water in the air to form copper(II) hydroxide. C The white copper compound is slowly oxidised. D Water is absorbed from the air and causes the reaction to reverse.

Question

Steam reacts with carbon to produce carbon monoxide and hydrogen. C(s) + H2O(g) → CO(g) + H2(g) Which substance is reduced in the reaction? A carbon B carbon monoxide C hydrogen D water

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 E is in Group II of the Periodic Table. Which row describes element E and its oxide? element E oxide of E A metal acidic B metal basic C non-metal acidic D non-metal 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

Four different colourless solutions are each tested separately with aqueous sodium hydroxide and with acidified silver nitrate. Which solution is sodium chloride? aqueous acidified sodium hydroxide silver nitrate A no visible reaction white precipitate B no visible reaction no visible reaction C white precipitate no visible reaction D white precipitate white precipitate

Question

Which statement about elements in Period 3 of the Periodic Table is correct? A Aluminium is a non-metal in Group III. B Argon is in Group VIII and has eight electrons in its outer shell. C Magnesium is in Group II and has three electrons in its outer shell. D Sulfur is a metal in Group VI.

Question

The elements in Group I include lithium, sodium and potassium. Which statements about these elements are correct? 1 Sodium is denser than lithium. 2 Lithium has a lower melting point than potassium. 3 Potassium is a relatively soft metal. 4 Sodium is less reactive than lithium but more reactive than potassium. A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

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 statement about the noble gases is correct? A Argon is used in light bulbs and balloons. B Helium reacts with oxygen in the air. C They all have full outer electron shells. D They are all diatomic molecules.

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

P, Q, R and S are metals. P reacts with dilute hydrochloric acid forming hydrogen. Q reacts violently with water. R reacts with water to give hydrogen. S is formed by heating its oxide with carbon Which row identifies the metals? P Q R S A copper sodium potassium iron B zinc magnesium calcium iron C zinc sodium calcium magnesium D iron potassium sodium zinc

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

Why is stainless steel used to make cutlery? A It does not corrode. B It has a low density. C It is a good conductor of electricity. D It is a good conductor of heat.

Question

Which substances can be used to detect the presence of water? 1 cobalt(II) chloride 2 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

Which two compounds are formed by the burning of fossil fuels and are atmospheric pollutants? A carbon dioxide and hydrogen chloride B carbon monoxide and sulfur dioxide C oxides of nitrogen and water D oxides of nitrogen and ammonia

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

A farmer knows his soil needs phosphorus and potassium. He has a choice of four fertilisers. 1 NH4NO3 2 (NH4)3PO4 3 KNO3 4 (NH2)2CO Which fertilisers should he use? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

Question

Which process is a source of methane? A respiration B combustion of ethanol C decomposition of calcium carbonate D decomposition of vegetation

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

Which structure represents a compound in the alcohol homologous series? A B C D H H H H O H H H H H H C C H H C C C H C C C H C C C H H H H H O H H O H H H H H

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

Compound X has the molecular formula C2H6O. Which statement about compound X is correct? A X is unsaturated. B X is a carboxylic acid. C X is formed by the reaction of ethane with steam. D X is used as a fuel.

Question

A small quantity of a solid chemical is added to a large excess of aqueous ethanoic acid. No bubbles of gas are seen and the solid dissolves to give a colourless solution. What was the solid chemical? A calcium hydroxide B copper(II) oxide C magnesium D sodium carbonate

Question

Which statement about carbohydrates and proteins is correct? A Carbohydrates and proteins are constituents of food. B Carbohydrates and proteins are natural polymers used to make larger molecules called monomers. C Carbohydrates and proteins are synthetic polymers. D Carbohydrates and proteins cause pollution as they are non-biodegradable. 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.).