Chemistry 0620/12 February/March 2020: question paper and mark scheme

Question

Which row represents the particles of a gas colliding most frequently? pressure temperature A high high B high low C low high D low low

Question

Which test is used to show that a sample of water is pure? A Evaporate the water to see if any solids remain. B Heat the water to check its boiling point. C Test with anhydrous cobalt(II) chloride. D Use universal indicator paper to check its pH.

Question

Which piece of apparatus is used to measure 1.5 cm3 of a solution accurately? A 25 cm3 measuring cylinder B 25 cm3 pipette C 50 cm3 measuring cylinder D 50 cm3 burette

Question

A representation of an atom is shown. – + + – – + + + – – + – What is the nucleon number of this atom? A 6 B 7 C 12 D 13

Question

Lithium reacts with fluorine to form the compound lithium fluoride. Which statement about this reaction is correct? A Each fluorine atom gains one electron. B Each fluorine atom gains two or more electrons. C Each fluorine atom loses one electron. D Each fluorine atom loses two or more electrons.

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Ammonia, NH3, is a covalent molecule. Which diagram shows the outer shell electron arrangement in a molecule of ammonia? A B H N H H N H H H C D H N H H N H H H

Question

Which row describes the structure and a use of diamond? structure use A ionic in cutting tools B ionic lubricant C macromolecular in cutting tools D macromolecular lubricant

Question

Methane, CH4, burns in air to form carbon dioxide and water. What is the balanced equation for this reaction? A CH4(g) + O2(g) → CO2(g) + 2H2O(g) B CH4(g) + 2O2(g) → CO2(g) + 2H2O(g) C CH4(g) + 2O2(g) → CO2(g) + H2O(g) D CH4(g) + 3O2(g) → CO2(g) + 2H2O(g)

Question

Which statement about electrolysis is correct? A Chemical energy is converted to electrical energy. B Electrons flow through the electrolyte. C Ionic compounds are broken down. D Metals are formed at the positive electrode.

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Which energy level diagram shows the reaction that will give out the most energy? A B reactants products energy energy products reactants progress of reaction progress of reaction C D products reactants energy energy reactants products progress of reaction progress of reaction

Question

Which change is a physical change? A Copper(II) carbonate changes colour from green to black when it is heated, and stays black when it cools. B Ethanol reacts with oxygen to form carbon dioxide and water. C Hydrogen peroxide decomposes into water and oxygen when it is boiled. D Ice forms liquid water when it is heated.

Question

Marble chips (calcium carbonate) react with hydrochloric acid in an exothermic reaction. calcium carbonate + hydrochloric acid → calcium chloride + water + carbon dioxide When excess marble chips are added to dilute hydrochloric acid the rate of the reaction starts off fast, then gets slower until the reaction stops. Why does the reaction rate get slower? A The concentration of the hydrochloric acid is decreasing. B The concentration of calcium chloride is increasing. C The calcium carbonate is completely used up. D The temperature of the mixture decreases.

Question

The diagram shows the change from an anhydrous salt to its hydrated form. forward anhydrous salt hydrated salt reverse Which statement is correct? A The forward reaction requires heat and water. B The forward reaction requires water only. C The reverse reaction requires heat and water. D The reverse reaction requires water only.

Question

A violent reaction occurs when a mixture of chromium(III) oxide and aluminium is ignited with a magnesium fuse as shown. magnesium fuse crucible mixture of chromium(III) oxide and aluminium sand The equation for the reaction is shown. Cr2O3 + 2Al → 2Cr + Al 2O3 Which substance is oxidised in the reaction? A aluminium B aluminium oxide C chromium D chromium(III) oxide

Question

A farmer’s soil is acidic. Which substance should the farmer add to neutralise the soil? A ammonium sulfate B calcium oxide C hydrochloric acid D NPK fertiliser

Question

Three elements, X, Y and Z, are burned in oxygen. The oxides formed are dissolved in water and the pH of the solutions measured. The results are shown. pH of oxide solution X 2.0 Y 14.0 Z 8.0 Which statements are correct? 1 Element X could be sulfur. 2 Element Y could be sodium. 3 Element Z is a non-metal. 4 No metal elements were used. A 1 only B 1 and 2 C 2 and 3 D 3 and 4

Question

The following substances can be reacted together to prepare salts. 1 copper(II) oxide and excess hydrochloric acid 2 hydrochloric acid and excess sodium hydroxide 3 hydrochloric acid and excess zinc carbonate In which reactions can the excess reactant be separated from the solution by filtration? A 1 and 2 B 1 and 3 C 2 and 3 D 3 only

Question

Salt S is dissolved in water and three tests are carried out on the solution. test result 1 aqueous sodium green precipitate formed, hydroxide is added insoluble in excess sodium hydroxide 2 dilute nitric acid is added no reaction 3 aqueous barium nitrate is added white precipitate formed to the acidified solution from test 2 What is the identity of S? A copper(II) chloride B copper(II) sulfate C iron(II) chloride D iron(II) sulfate

Question

Which statement about the Periodic Table is correct? A Most metallic elements are on the left. B Elements in the same period have the same number of outer electrons. C Elements on the left are usually gases. D The relative atomic mass of the elements increases from right to left.

Question

The diagram shows elements W, X, Y and Z in a section of the Periodic Table. W X Z Y Which statement about the reactivity of the elements is correct? A X is more reactive than Y, and W is more reactive than Z. B X is more reactive than Y, and Z is more reactive than W. C Y is more reactive than X, and W is more reactive than Z. D Y is more reactive than X, and Z is more reactive than W.

Question

Some properties of substances are listed. 1 They conduct electricity. 2 They have low densities. 3 They have high melting points. 4 They are malleable. Which properties are shown by transition metals? A 1 and 3 only B 1 and 4 only C 1, 2 and 3 D 1, 3 and 4

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Which statement about the noble gas argon is correct? A It burns with a hot flame. B It is used in airships because of its low density. C It exists as diatomic molecules. D It has eight electrons in its outermost shell.

Question

Sodium is a Group I metal. Which property, that is typical of most metals, is not shown by sodium? A conductor of heat B high melting point C malleable D shiny

Question

Manganese, nickel and silver are all metals. Samples of powdered manganese, nickel and silver were placed in separate test-tubes containing dilute hydrochloric acid. The results are shown. hydrogen hydrogen nickel manganese silver What is the order of reactivity of the metals, most reactive to least reactive? A manganese → nickel → silver B manganese → silver → nickel C silver → manganese → nickel D silver → nickel → manganese

Question

Which statement about aluminium is correct? A Aluminium is easy to extract from its ore because it is near the bottom of the reactivity series. B Aluminium is formed when aluminium oxide is heated with carbon. C Bauxite is an important ore of aluminium. D Hematite is an important ore of aluminium.

Question

Some properties of aluminium are listed. 1 It conducts heat. 2 It has a low density. 3 It is strong. 4 It is resistant to corrosion. Which of these properties make aluminium suitable for making food containers for chilled food products? A 1, 2 and 4 B 1, 3 and 4 C 1 only D 4 only

Question

Water is treated at a waterworks to make it fit to drink. What is present in the water when it leaves the waterworks? A bacteria only B bacteria and insoluble substances C chlorine compounds only D chlorine compounds and soluble substances

Question

Sulfur dioxide, carbon monoxide and oxides of nitrogen are common gaseous pollutants found in the air. Which pollutants contribute to acid rain? A carbon monoxide and sulfur dioxide B oxides of nitrogen and sulfur dioxide C oxides of nitrogen only D sulfur dioxide only

Question

Which methods prevent iron from rusting? coating washing with painting with zinc salt water A key B = prevents rusting C = does not prevent rusting D

Question

Fertilisers are mixtures of different compounds used to increase the growth of crops. Which pair of substances contain the three essential elements for plant growth? A ammonium nitrate and calcium phosphate B ammonium nitrate and potassium chloride C ammonium phosphate and potassium chloride D potassium nitrate and calcium carbonate

Question

Which process does not add a greenhouse gas to the atmosphere? A burning methane B decomposition of vegetation C polymerisation D respiration

Question

Why is sulfur dioxide used as a food preservative? A It is a gas at room temperature. B It is used to make sulfuric acid. C It kills bacteria. D It reacts with alkalis.

Question

Which statements about lime (calcium oxide) and limestone (calcium carbonate) are correct? 1 Limestone is used in the manufacture of iron. 2 Lime is made by heating limestone. 3 Powdered limestone is heated with clay in the production of cement. 4 Limestone causes soil to be acidic. A 1 and 2 only B 2 and 3 only C 1, 2 and 3 D 1, 3 and 4

Question

The formulae of two organic compounds, P and Q, are shown. P Q CH3CH2CH2OH CH3CHCHCH3 Which type of organic compounds are P and Q? P Q A alcohol alkane B alcohol alkene C carboxylic acid alkane D carboxylic acid alkene

Question

Petroleum is an important raw material that is separated into useful products. Which terms describe petroleum and the method used to separate it? description separation method A compound cracking B compound fractional distillation C mixture cracking D mixture fractional distillation

Question

Which type of compound is a member of a homologous series? A carbonate B carboxylic acid C halogen D hydroxide

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Which statements about propene are correct? 1 Propene contains only single bonds. 2 Propene decolourises bromine water. 3 Propene is obtained by cracking. 4 Propene is a hydrocarbon. A 1 and 4 B 2, 3 and 4 C 2 and 4 only D 4 only

Question

Which row describes the production of ethanol and its properties? can be made can be made is used as a is used as a from glucose from ethene fuel solvent A key B = yes C = no D

Question

Which statements about ethanoic acid are correct? 1 It contains a carbon–oxygen double bond. 2 It contains two carbon atoms. 3 It decolourises bromine water. 4 It contains an –OH group. A 1 and 2 only B 1 and 3 C 1, 2 and 4 D 2, 3 and 4

Question

Which polymers are natural polymers? 1 carbohydrates 2 poly(ethene) 3 protein A 1, 2 and 3 B 1 and 3 only C 1 only D 3 only 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.).