Chemistry 0620/12 October/November 2022: question paper and mark scheme

Question

Which statement describes the particles in a liquid? A They are close together but have no regular arrangement. B They are densely packed in a regular order. C They move freely at high speed and are widely spaced. D They vibrate but do not move from a fixed position.

Question

The apparatus used in a chromatography experiment is shown. Which line shows the starting depth of the solvent in the beaker? A baseline B C D

Question

Filtration is used to separate mixtures. Which type of mixture is separated by filtration? A an insoluble solid from a liquid B a liquid solvent from a solution C a dissolved solid from a solution D a liquid from a mixture of liquids

Question

17 Cl ? How many neutrons are present in one atom of 35 A 17 B 18 C 35 D 52

Question

Which statement about an alloy is correct? A It is a compound made of two or more elements, one of which is a metal. B It is a layer of a metal plated onto another metal. C It is a mixture of a metal with one or more other elements. D It is a single element.

Question

Which statement about compounds is correct? A Covalent compounds are less volatile than ionic compounds. B Covalent compounds conduct electricity when they are solid. C Ionic compounds conduct electricity when molten. D Ionic compounds are insoluble in water.

Question

Which statement explains why diamond is used in cutting tools? A It has no free electrons. B It has a high melting point. C It is colourless. D It is hard.

Question

Caffeine is a stimulant found in coffee. O CH3 H 3C C N N C C H C C N O N CH3 caffeine Which formula represents caffeine? A C7H10N4O2 B C8H10N3O2 C C8H10N4O2 D C8H11N4O2

Question

What is the relative formula mass of ammonium sulfate, (NH4)2SO4? A 63 B 114 C 118 D 132

Question

The electrolysis of concentrated aqueous sodium chloride and molten sodium chloride is shown. + – electrode 1 + – + – electrode 2 concentrated aqueous molten sodium chloride sodium chloride What are the products at electrodes 1 and 2? electrode 1 electrode 2 A chlorine chlorine B hydrogen chlorine C hydrogen sodium D sodium sodium

Question

When an acid is added to an alkali, the temperature of the reaction mixture rises. Which words describe this reaction? A decomposition and endothermic B decomposition and exothermic C neutralisation and endothermic D neutralisation and exothermic

Question

Some properties of four fuels are shown. Which fuel is a gas at room temperature and makes two products when it burns in a plentiful supply of air? melting point boiling point fuel formula / °C / °C A hydrogen H2 –259 –253 B methane CH4 –182 –164 C octane C8H18 –57 126 D wax C31H64 60 400

Question

Which process is a physical change? A burning wood B cooking an egg C melting an ice cube D rusting iron

Question

The volume of gas given off in a chemical reaction is measured over time. The results are shown. 100 90 80 70 volume 60 of gas 50 / cm3 40 30 20 10 0 0 2 4 6 8 10 time / s At which time is the rate of reaction greatest? A 0s B 4s C 6s D 10 s

Question

Which row describes the colours of the named salts? hydrated hydrated anhydrous anhydrous copper(II) sulfate cobalt(II) chloride copper(II) sulfate cobalt(II) chloride A blue blue white pink B blue pink white blue C white blue blue pink D white pink blue white

Question

When magnesium is heated with zinc oxide a reaction occurs. The equation is shown. Mg + ZnO → MgO + Zn Which substance is oxidised? A magnesium B magnesium oxide C zinc D zinc oxide

Question

X and Y are oxides of two different elements. ● X reacts with water to produce aqueous solution Z. ● Z turns universal indicator paper blue. ● An aqueous solution of Y reacts with sodium carbonate to produce carbon dioxide gas. Which statement is correct? A X and Y are both the oxides of metals. B X and Y are both the oxides of non-metals. C X is the oxide of a metal and Y is the oxide of a non-metal. D X is the oxide of a non-metal and Y is the oxide of a metal.

Question

Copper(II) sulfate is made by reacting excess insoluble solid M and solution N. Which row identifies M and N and the method used to extract crystals of copper(II) sulfate from the mixture? M N method A copper sodium sulfate crystals are filtered out from the mixture B copper sulfuric acid mixture is filtered and the filtrate evaporated until crystals form C copper(II) carbonate sulfuric acid mixture is filtered and the filtrate evaporated until crystals form D copper(II) oxide sulfuric acid mixture is filtered and the residue dried

Question

Which row shows the observation when a few drops of aqueous P is added to concentrated aqueous Q? P Q observation A acidified potassium manganate(VII) sodium sulfite purple solution B sodium hydroxide zinc chloride white precipitate C ammonia potassium carbonate fizzing D barium chloride iron(III) sulfate brown precipitate

Question

Which statement about the Periodic Table is correct? A Elements in the same group have the same number of electron shells. B Elements are arranged in order of increasing proton number. C Metals are on the right and non-metals are on the left. D The most reactive elements are at the bottom of every group.

Question

Elements J and K are in the same period in the Periodic Table. J reacts with acids to produce a salt and hydrogen. K reacts with sodium to form an ionic compound. Which statement about J and K is correct? A An atom of J has more electrons than an atom of K. B J and K are both metals. C J and K are both non-metals. D J is to the left of K in the Periodic Table.

Question

Part of the Periodic Table is shown. Which element has a high density, a high melting point and forms a brown oxide? A D B C

Question

Gas G has 10 electrons. Gas H has eight more electrons than gas G. Both gases are monoatomic. Which statement about G and H is correct? A Both gases are in the same group of the Periodic Table. B Both gases are in the same period of the Periodic Table. C Both gases are very reactive. D Gas G has a higher atomic mass than gas H.

Question

Which property is correct for all metals? A They are good conductors of electricity. B They are hard. C They have high melting points. D They react with dilute acids.

Question

Silver is below copper in the reactivity series. Which row describes the reactions of silver? reaction with steam reaction with dilute hydrochloric acid A no reaction no reaction B no reaction reacts to produce hydrogen gas C reacts to produce hydrogen gas no reaction D reacts to produce hydrogen gas reacts to produce hydrogen gas

Question

Which types of reaction do hematite and limestone undergo in the blast furnace? hematite limestone A reduction reduction B reduction thermal decomposition C thermal decomposition reduction D thermal decomposition thermal decomposition

Question

Some properties and uses of different metals are shown. metal property use 1 aluminium low density aircraft 2 copper good conductor of electricity electrical wiring 3 copper poor conductor of heat cooking utensils 4 stainless steel corrodes easily cutlery Which rows link a use of the metal to its stated property? A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

Question

The diagram shows a stage in the purification of dirty water. dirty water sand pot with holes fine gravel in bottom coarse gravel Which process does this apparatus show? A chlorination B condensation C distillation D filtration

Question

Which substance in polluted air damages stonework and kills trees? A carbon dioxide B carbon monoxide C lead compounds D sulfur dioxide

Question

Ammonium nitrate, NH4NO3, is a fertiliser and is added to fields to help crops grow. Slaked lime, Ca(OH)2, is an alkali and is added to fields to reduce the acidity of the soil. Ammonium nitrate and slaked lime should not be added to a field at the same time because they react with each other to form a gas, Z. What is Z? A ammonia B hydrogen C nitrogen D oxygen

Question

Four reactions are shown. 1 2 copper(II) carbonate dilute hydrochloric acid calcium carbonate 3 4 dilute hydrochloric acid ethanol magnesium Which reactions produce water? A 1 and 2 B 1 and 3 C 2, 3 and 4 D 3 and 4 only

Question

Which element has an oxide that is used as a food preservative? A helium B hydrogen C iron D sulfur

Question

Which substance gives off carbon dioxide on heating? A lime B limestone C limewater D slaked lime

Question

Which statement about both ethane and ethanol is correct? A They are hydrocarbons. B They contain oxygen. C They contain the same number of atoms. D They produce water when burned.

Question

Fuel oil and naphtha are two fractions obtained from petroleum. What are the major uses of these fractions? fuel oil naphtha A jet fuel making chemicals B jet fuel making roads C ship fuel making chemicals D ship fuel making roads

Question

Which homologous series of compounds reacts to form an addition polymer? A alcohols B alkanes C alkenes D carboxylic acids

Question

What is the total number of shared electrons in ethane, C2H6? A 6 B 7 C 12 D 14

Question

Which process produces ethanol from glucose? A catalytic addition B cracking C fermentation D polymerisation

Question

Which statement about unsaturated hydrocarbons is correct? A CH3CH2CH=CHCH3 is an unsaturated hydrocarbon. B Ethene has more hydrogen atoms per molecule than ethane. C Unsaturated hydrocarbons have double bonds between carbon and hydrogen atoms. D Unsaturated hydrocarbons turn aqueous bromine from colourless to brown.

Question

An organic compound X contains two carbon atoms in each molecule. X reacts with aqueous sodium carbonate to give carbon dioxide. What is compound X? A ethanol B ethane C CH2=CH2 D CH3COOH 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.).