Chemistry 0620/12 May/June 2019: question paper and mark scheme

Question

Which row describes the arrangement and motion of particles in a solid? arrangement motion A random move in all directions B random stay in one place C regular move freely D regular vibrate about a fixed point

Question

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

Question

Which sequence is used to separate a soluble salt from a mixture of a soluble and an insoluble salt? A add solvent, heat the mixture, crystallise the mixture B add solvent, heat the mixture, filter, crystallise the filtrate C heat the mixture, filter, crystallise the filtrate D heat the mixture, filter, add solvent, crystallise the filtrate

Question

Which diagram shows the correct level of the solvent at the start of a chromatography experiment? A B spot of sample spot of sample level of solvent level of solvent C D level of solvent spot of sample spot of sample level of solvent 31

Question

What is an isotope of 15 E? 31 33 31 33 A 14 E B 15 E C 16 E D 16 E

Question

Which statement about the formation of ions in chemical reactions is correct? A A bromine atom loses an electron and forms a –1 ion. B A chlorine atom gains an electron and forms a –1 ion. C A potassium atom gains an electron and forms a +1 ion. D A sodium atom loses an electron and forms a –1 ion.

Question

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 statement explains why graphite is used as a lubricant? A Each carbon atom in graphite forms three bonds. B The bonding in graphite is covalent. C The carbon atoms are arranged in hexagons. D There are weak forces between the layers of carbon atoms.

Question

The compound magnesium nitrate has the formula Mg(NO3)2. What is the relative formula mass of magnesium nitrate? A 86 B 134 C 148 D 172

Question

Samples of dilute sulfuric acid and concentrated hydrochloric acid are separately electrolysed. Which row describes the product at each electrode during the electrolysis of both substances? product at product at each anode each cathode A different different B different same C same different D same same

Question

Which row describes the energy level diagram and energy change in an exothermic reaction? energy level diagram energy is A reactants higher than products absorbed B reactants higher than products released C reactants lower than products absorbed D reactants lower than products released

Question

Which process is a physical change? A a firework exploding B burning wood C chocolate melting D iron rusting

Question

An experiment is set up as shown. The mass of the conical flask and its contents is measured at 30 second intervals. 50 cm3 dilute hydrochloric acid 1 g calcium carbonate balance Which statement about the reaction and about changes to the reaction conditions is correct? A Adding 10 cm3 of water to the 50 cm3 of acid increases the rate of the reaction. B Increasing the size of the pieces of calcium carbonate increases the rate of the reaction. C Increasing the temperature increases the rate of the reaction. D The mass of the conical flask increases as carbon dioxide is formed.

Question

When blue-green crystals of nickel(II) sulfate are heated, water is produced and a yellow solid remains. When water is added to the yellow solid, the blue-green colour returns. Which process describes these changes? A combustion B corrosion C neutralisation D reversible reaction

Question

Different types of reaction are listed. 1 oxidation 2 decomposition 3 combustion 4 reduction The equation shows the reaction of magnesium with oxygen. 2Mg + O2 → 2MgO Which types of reaction does magnesium undergo in this reaction? A 1 and 3 B 1 only C 2 and 4 D 4 only

Question

Which colours are seen when litmus and methyl orange are added to separate samples of aqueous sodium hydroxide? litmus methyl orange A blue orange B blue yellow C purple orange D purple yellow

Question

The positions of elements W, X, Y and Z in the Periodic Table are shown. W Y X Z Which elements form basic oxides? A W, X and Y B W and X only C Y only D Z only

Question

An acid is neutralised by adding an excess of an insoluble solid base. A soluble salt is formed. How is the pure salt obtained from the reaction mixture? A crystallisation → evaporation → filtration B evaporation → crystallisation → filtration C filtration → crystallisation → evaporation D filtration → evaporation → crystallisation

Question

A substance is tested with three different reagents. Which row shows the results obtained with aqueous iron(II) nitrate? aqueous acidified aqueous acidified aqueous sodium hydroxide silver nitrate barium nitrate A green precipitate, no reaction no reaction insoluble in excess B green precipitate, white precipitate white precipitate insoluble in excess C white precipitate, cream precipitate no reaction insoluble in excess D white precipitate that no reaction white precipitate dissolves in excess

Question

Part of the Periodic Table is shown. X Y Z Which row describes the properties of X, Y and Z? good conductor high melting of electricity point A X Z B Y Z and X C Y and Z Z D Z and X X

Question

The melting points and boiling points of the elements of Group I of the Periodic Table are shown. melting point boiling point element / °C / °C lithium 181 1330 sodium 98 883 potassium 63 759 rubidium 39 688 caesium 28 671 Which pair of elements are liquid at 800 °C? A caesium and rubidium B potassium and sodium C lithium and sodium D potassium and caesium

Question

The table gives some information about four metals, Q, R, S and T. melting point density colour of catalytic in °C in g / dm3 metal sulfate activity Q 650 1.74 white no R 1455 green S 842 1.55 white no T 1085 8.96 yes Which statements are correct? 1 T forms a coloured sulfate. 2 Q and S are transition elements. 3 The density of R is 0.53 g / cm3. 4 R shows catalytic activity. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

Question

The electronic structures of helium, neon and argon are shown. He Ne Ar Which row describes these gases? reactivity form of the gas electronic structure A reactive monoatomic incomplete outer shell of electrons B unreactive diatomic complete outer shell of electrons C unreactive diatomic incomplete outer shell of electrons D unreactive monoatomic complete outer shell of electrons

Question

The diagrams show the structure of two substances used to make electrical conductors. X Y Which statement correctly describes X and Y? A X is a pure metal and Y is a compound. B X is a pure metal and Y is an alloy. C X is a solid and Y is a liquid. D X is harder and stronger than Y.

Question

Three different metals are reacted separately with dilute hydrochloric acid and with water. The results are shown. reaction with metal reaction with water dilute hydrochloric acid R reacts no reaction S no reaction no reaction T reacts reacts What is the order of reactivity of the metals starting with the most reactive? A R→S→T B S→R→T C T→R→S D T→S→R

Question

Iron is extracted from its ore in a blast furnace. Hematite, coke, limestone and hot air are added to the furnace. Which explanation is not correct? A Coke burns and produces a high temperature. B Hematite is the ore containing the iron as iron(III) oxide. C Hot air provides the oxygen for the burning. D Limestone reduces the iron(III) oxide to iron.

Question

Which property of aluminium makes it useful in the manufacture of aircraft? A conducts electricity B high boiling point C low density D silver colour

Question

Water can be treated by filtration then chlorination. Which uses do not need water of this quality? 1 water for cooling in industry 2 water for washing clothes 3 water for drinking A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

Question

The following gases pollute the atmosphere. 1 sulfur dioxide 2 oxides of nitrogen 3 carbon monoxide Which gases contribute to acid rain? A 1 only B 1 and 2 C 1 and 3 D 2 and 3

Question

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

Question

Ammonia gas is produced when compound X is warmed with an ammonium salt. What is X? A calcium carbonate B calcium hydroxide C sodium chloride D potassium nitrate

Question

Which statement describes a disadvantage of sulfur dioxide? A It can be used as a bleach when making wood pulp. B It can be used to kill bacteria in food. C It can be used to manufacture sulfuric acid. D It dissolves in water to form acid rain.

Question

The diagram represents a lime kiln used to heat limestone to a very high temperature. waste gases lime kiln limestone fuel in fuel in air in air in X What leaves the kiln at X? A calcium carbonate B calcium hydroxide C calcium oxide D calcium sulfate

Question

What is the structure of ethanoic acid? A B C D H H H H H H H O H C C OH C C H C C H H C C H H H H H H H OH

Question

Which fuel could be gasoline? Is it obtained from petroleum? yes no Is it used as Is it used as fuel for cars? fuel for cars? yes no yes no A B C D

Question

A hydrocarbon W burns to form carbon dioxide and water. W decolourises bromine water. What is the name of W and what is its structure? name of W structure of W H H A ethane H C C H H H H H B ethane C C H H H H C ethene H C C H H H H H D ethene C C H H

Question

Which statement about homologous series is not correct? A All homologous series are hydrocarbons. B Members of a homologous series have the same functional group. C Members of a homologous series have similar chemical properties. D The alkanes are an example of a homologous series.

Question

Which statements about ethanol are correct? 1 It can be made by fermentation. 2 It is an unsaturated compound. 3 It burns in air and can be used as a fuel. A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

Question

What are the properties of aqueous ethanoic acid? reacts with decolourises turns damp red calcium carbonate to bromine water litmus blue make carbon dioxide A B C D

Question

Which polymers are found in foods? 1 carbohydrates 2 poly(ethene) 3 protein 4 Terylene A 1 only B 1 and 3 C 2 and 4 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 85 88 89 91 93 96 – 101 103 106 108 112 115 119 122 128 127 131 16 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.).