Cambridge A Level Chemistry 9701 — 2018 May/June Paper 1 · Variant 1

1 This question refers to isolated gaseous atoms. In which atom are all electrons paired? A Ba B Br C S D Si

Mark scheme: A

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2 Which compound has a boiling point that is influenced by hydrogen bonding? A CH3CHO B CH3OCH3 C HCO2CH3 D HCO2H

Mark scheme: D

More questions on Intermolecular forces, electronegativity and bond properties

3 Which fuel would produce the largest mass of CO2 when 10 kg of the fuel undergo complete combustion? A biodiesel, C17H34O2 B ethanol, C2H6O C octane, C8H18 D propane, C3H8

Mark scheme: C

More questions on Reacting masses and volumes (of solutions and gases)

4 The diagram shows the Boltzmann distribution of energies in a gas. The gas can take part in a reaction with an activation energy, Ea. The gas is maintained at a constant temperature. P proportion of molecules with a given energy 0 0 Ea molecular energy Which statement is correct? A If a catalyst is added, peak P will be lower and Ea will move to the left. B If a catalyst is added, peak P will be lower and Ea will move to the right. C If a catalyst is added, peak P will be the same and Ea will move to the left. D If a catalyst is added, peak P will be the same and Ea will move to the right.

Mark scheme: C

More questions on Effect of temperature on reaction rates and the concept of activation energy

5 Which molecule has no overall dipole? A CH3Cl B CH2Cl 2 C CHCl 3 D CCl 4

Mark scheme: D

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6 Which solid contains more than one type of bonding? A iodine B silicon dioxide C sodium chloride D zinc

Mark scheme: A

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7 Enthalpy changes of combustion can be used to determine enthalpy changes of formation. The following equation represents the enthalpy change of formation of butane. 4C(s) + 5H2(g) → C4H10(g) By using the following standard enthalpy of combustion data, what is the value of the standard enthalpy change of formation, , of butane? substance C(s) –394 H2(g) –286 C4H10(g) –2877 A –5883 kJ mol–1 B –129 kJ mol–1 C +129 kJ mol–1 D +2197 kJ mol–1

Mark scheme: B

More questions on Hess’s law

8 Ethanedioate ions, C2O4 2–, react with a suitable reagent to form CO2. A half-equation for this reaction is shown. C2O4 2– → 2CO2 + 2e– Which row is correct? oxidation state of 2– type of reaction carbon in C2O4 A +3 oxidation B +3 reduction C +5 oxidation D +5 reduction

Mark scheme: A

More questions on Redox processes: electron transfer and changes in oxidation number (oxidation state)

9 Oxidation numbers should be used to answer this question. A redox reaction takes place between hydroxylammonium ions, [NH3OH]+, and acidified iron(III) ions, Fe3+. The products are iron(II) ions, Fe2+, H+ ions, water and a compound of nitrogen. The mole ratio of reacting hydroxylammonium ions to reacting iron(III) ions is 1 : 2. Which nitrogen-containing compound could be formed in the reaction? A NH3 B N2O C NO D NO2

Mark scheme: B

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10 Element X has a higher first ionisation energy than element Y. Two students state what they believe is one factor that helps to explain this. student 1 “X has a higher first ionisation energy than Y because an atom of X has more protons in its nucleus than an atom of Y.” student 2 “X has a higher first ionisation energy than Y because X has a smaller atomic radius than Y.” Only one of the two students is correct. What could X and Y be? X Y A carbon boron B magnesium aluminium C oxygen nitrogen D oxygen sulfur

Mark scheme: D

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11 Hydrogen ions catalyse the hydrolysis of esters. Which statement is correct? A The hydrogen ions act as a heterogeneous catalyst. B The hydrogen ions are in the same phase as the reactants. C The hydrogen ions are used up in the reaction. D The hydrogen ions have no effect on the activation energy of the reaction.

Mark scheme: B

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12 Silicon is heated in an excess of chlorine, producing compound J. Excess water is added to the sample of J produced. Which row is correct? Is HCl produced structure of J when water is added to J? A giant molecular no B giant molecular yes C simple molecular no D simple molecular yes

Mark scheme: D

More questions on Periodicity of chemical properties of the elements in Period 3

13 Which element has the second smallest atomic radius in its group and the third lowest first ionisation energy in its period? A boron B calcium C magnesium D sodium

Mark scheme: C

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14 Chlorine reacts with cold aqueous sodium hydroxide to produce sodium chloride, water and compound X. Chlorine reacts with hot aqueous sodium hydroxide to produce sodium chloride, water and compound Y. What are the oxidation states of chlorine in compound X and compound Y? X Y A –1 –5 B –1 +5 C +1 –5 D +1 +5

Mark scheme: D

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15 In which reaction does ammonia behave as a Brønsted-Lowry base? A NH3 + CH3CH2Br → CH3CH2NH2 + HBr B NH3 + H2O + CO2 → (NH4)HCO3 C 2NH3 + 2Na → 2NaNH2 + H2 D 4NH3 + 3O2 → 2N2 + 6H2O

Mark scheme: B

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16 Aqueous silver nitrate is added to a solution of potassium iodide. Aqueous ammonia is then added. What would be observed? A a cream precipitate that dissolves on addition of aqueous ammonia B a cream precipitate that does not dissolve on addition of aqueous ammonia C a yellow precipitate that dissolves on addition of aqueous ammonia D a yellow precipitate that does not dissolve on addition of aqueous ammonia

Mark scheme: D

More questions on Some reactions of the halide ions

17 Oxides of nitrogen are present in the environment due to natural and man-made sources. Which row is correct? natural source of nitrogen oxides man-made source of nitrogen oxides A electrical discharges in the atmosphere internal combustion engines B electrical discharges in the atmosphere as a by-product of the Haber process C decomposition of dead plants in rivers internal combustion engines D decomposition of dead plants in rivers as a by-product of the Haber process

Mark scheme: A

More questions on Nitrogen and sulfur

18 When 3.00 g of an anhydrous nitrate of a Group 2 metal is decomposed, 1.53 g of gas is produced. What is the nitrate compound? A beryllium nitrate B calcium nitrate C magnesium nitrate D strontium nitrate

Mark scheme: D

More questions on Similarities and trends in the properties of the Group 2 metals, magnesium to barium, and their compounds

19 Which row correctly describes one property of barium and one property of barium oxide? observation when pH of solution obtained when barium metal is a spatula measure of BaO is added to water added to 100 cm3 of water A a few gas bubbles 8 form on the metal surface B a few gas bubbles 13 form on the metal surface C rapid effervescence is seen 8 D rapid effervescence is seen 13

Mark scheme: D

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20 Fructose is a sugar with more than one chiral centre. The fructose molecule is shown with X, Y and Z indicating three carbon atoms. OH H C H X C O HO C H H C OH Y H C OH H C H Z OH fructose Which carbon atoms are chiral centres? A X, Y and Z B X and Y only C X only D Y only

Mark scheme: B

More questions on Isomerism: optical

21 Which pair of alcohols are isomers of each other? A butan-1-ol and 2,2-dimethylpropan-1-ol B butan-2-ol and 2-methylpropan-2-ol C pentan-1-ol and 2-methylpropan-2-ol D propan-2-ol and 2-methylpropan-2-ol

Mark scheme: B

More questions on Isomerism: structural isomerism and stereoisomerism

22 Sodium methoxide, Na+CH3O–, reacts with 2-chloro-2-methylpropane in a nucleophilic substitution reaction. The nucleophile is the CH3O– ion. Which row is correct? intermediate or product transition state A (CH3)3C+ (CH3)3COCH3 B (CH3)3C+ (CH3)3CCH2OH C [HOCH2- - -C(CH3)3- - -Cl ]– HOCH2C(CH3)3 D [H3CO- - -C(CH3)3- - -Cl ]– H3COC(CH3)3

Mark scheme: A

More questions on Halogenoalkanes

23 Which alcohol can be dehydrated to give two products which are structural isomers of each other? A B C D H H H H H H CH3 H H H H CH3 H C C C C OH H C C C OH H C C C OH H C C OH H H H H H H H H CH3 H H CH3

Mark scheme: B

More questions on Alcohols

24 Which reagent could detect the presence of alcohol in a mixture consisting mainly of alkanes and alkenes? A Na B Br2 (in CCl 4) C KMnO4(aq) D 2,4-dinitrophenylhydrazine

Mark scheme: A

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25 Compound Q ● contains a chiral centre, ● gives a positive result with Fehling’s reagent, ● gives a positive result with alkaline aqueous iodine. What could compound Q be? A 1-hydroxybutanone B 2-hydroxybutanal C 3-hydroxybutanal D 3-hydroxybutanone

Mark scheme: C

More questions on Isomerism: optical

26 What is the mechanism for the reaction of ethanal, CH3CHO, with hydrogen cyanide, HCN, in the presence of NaCN? O O– O A CH3 C H CH3 C H CH3 C + H– CN– CN CN O –O H C N OH B CH3 C H CH3 C H CH3 C H + CN– CN– CN CN O H C N OH OH C CH3 C H CH3 + C H CH3 C H CN– CN D initiation HCN H • + • CN O O • propagation CH3 C + • CN CH3 C H H CN O • OH CH3 C H + H CN CH3 C H + • CN CN CN O • OH termination CH3 C H + H • CH3 C H CN CN

Mark scheme: B

More questions on Nitriles and hydroxynitriles

27 Ethyl propanoate is refluxed with aqueous sodium hydroxide. The alcohol produced is then reacted with methyl propanoic acid to make a second ester. What is the structural formula of this second ester? A B O O CH3 CH2 O C CH CH3 CH3 CH2 CH2 O C CH CH3 CH3 CH3 C D O O CH3 C O CH2 CH CH3 CH3 CH2 C O CH2 CH CH3 CH3 CH3

Mark scheme: A

More questions on Esters

28 Which reagent could be used to carry out the following reaction? O O OH A a solution containing acidified dichromate(VI) ions B a solution containing dilute, acidified manganate(VII) ions C a solution containing hot, concentrated, acidified manganate(VII) ions D concentrated sulfuric acid

Mark scheme: A

More questions on Aldehydes and ketones

29 Four reactions of propanoic acid to form salts and other products are shown. Which reaction does not show the formulae of all the correct products? A B CH3CH2CO2 – K+(aq) + H2O(l) (CH3CH2CO2 –)2Mg2+(aq) + H2(g) KOH Mg(s) CH3CH2CO2H(aq) propanoic Na2CO3 acid Ca(OH)2 C D CH3CH2CO2 – Na+(aq) + CO2(g) (CH3CH2CO2 –)2Ca2+(aq) + H2O(l)

Mark scheme: C

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30 Compound X contains three carbon atoms. Part of a simplified infra-red spectrum of compound X is shown. 100 transmittance 50 0 4000 3000 2000 1500 1000 500 wavenumber / cm–1 Which compound could be X? A CH3CH2CHO B CH3CH2CO2H C CH3CH2CH2OH D CH3CO2CH3

Mark scheme: C

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31 One mole of sulfuric acid is used to make an aqueous solution. The solution contains H2SO4 molecules, H+ ions, SO4 2– ions and HSO4 – ions. Which statements are correct? 1 The solution contains 6.02 × 1023 sulfur atoms. 2 The solution contains an exactly equal number of H+ ions and HSO4 – ions. 3 One mole of SO4 2– ions contains two moles of electrons.

Mark scheme: D

More questions on The mole and the Avogadro constant

32 Which statements are correct? 1 The hydrogen bonds in ice are more regularly arranged than in water. 2 The solidification of water to form ice is exothermic. 3 Pure water is less dense than ice.

Mark scheme: B

More questions on Intermolecular forces, electronegativity and bond properties

33 Calcium reacts with water to form calcium hydroxide and hydrogen. Ca(s) + 2H2O(l) → Ca(OH)2(s) + H2(g) The standard enthalpy change for this reaction is – 414 kJ mol–1. What further information is needed in order to calculate the standard enthalpy change of formation of calcium hydroxide, Ca(OH)2(s)? 1 for H2O(l) 2 for H2(g) 3 first and second ionisation energies of Ca

Mark scheme: D

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34 Which statements are correct when a reversible reaction is at equilibrium? 1 All species are at equal concentration. 2 The concentrations of all species remain constant. 3 The rate of the forward reaction equals the rate of the reverse reaction.

Mark scheme: C

More questions on Chemical equilibria: reversible reactions, dynamic equilibrium

35 Each of the three mixtures shown can result in a chemical reaction. Which mixtures result in a redox reaction? 1 bromine + hydrogen 2 sodium chloride + concentrated sulfuric acid 3 potassium iodide + silver nitrate

Mark scheme: D

More questions on Redox processes: electron transfer and changes in oxidation number (oxidation state)

36 Which statements correctly describe an oxide of nitrogen acting as an atmospheric pollutant? 1 Nitrogen monoxide, NO, reacts with oxygen to form nitrogen dioxide which contributes to acid rain. 2 Nitrogen dioxide reacts with sulfur dioxide to form sulfur trioxide which reacts with water to form sulfuric acid. 3 Nitrogen oxides react with unburnt hydrocarbons in sunlight to form other pollutants.

Mark scheme: A

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37 Polymer Z contains the length of polymer chain shown below. This short length of chain is found many times within the chains of polymer Z, although it is not the repeat unit. – CH2 – CHCl – CH2 – What could be the name of polymer Z? 1 poly(2-chloropropene) 2 poly(chloroethene) 3 PVC

Mark scheme: C

More questions on Addition polymerisation

38 Limonene is found in lemons. limonene Limonene is heated with concentrated acidified potassium manganate(VII). Which compounds are produced? 1 CH3COCH2CH2CH(CH2CO2H)2 2 CO2 3 CH3COCH2CH2CH(COCH3)CH2CO2H

Mark scheme: C

More questions on Alkenes

39 Chlorofluoroalkanes have been used as the refrigerant in refrigerators but care has to be taken in disposing of old refrigerators. Which statements about chlorofluoroalkanes are correct? 1 C–Cl bonds more readily undergo homolytic fission than C–F bonds. 2 Care is taken in the disposal of old refrigerators because of possible ozone depletion. 3 C2H4Cl F is more volatile than C2H6.

Mark scheme: B

More questions on Intermolecular forces, electronegativity and bond properties

40 The Mr of compound X is 72. The composition by mass of X is 66.7% carbon, 11.1% hydrogen and 22.2% oxygen. X gives an orange precipitate with 2,4-dinitrophenylhydrazine reagent. X does not react with Fehling’s reagent. What can be deduced from this information? 1 X is a carbonyl compound. 2 X is a ketone. 3 X is butanone.

Mark scheme: A

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