Cambridge A Level Chemistry 9701 — 2013 May/June Paper 1 · Variant 2

Question 1

1 During the electrolysis of molten aluminium oxide to produce aluminium, using carbon electrodes, two consecutive reactions occur at the anode, each producing a different gas. How does the oxidation number of oxygen change in these reactions? A decreases by 2, then increases by 2 B increases by 2, then decreases by 2 C increases by 2, then decreases by 4 D no change, then decreases by 2

Accepted Answer

B

Question 2

2 Equations involving four enthalpy changes are shown. Na(g)  →  Na+(g)  +  e– ∆H = W Na(g)  →  Na2+(g)  +  2e– ∆H = X Na(s)  →  Na(g) ∆H = Y Na(s)  →  Na2+(g)  +  2e– ∆H = Z What is the second ionisation energy of sodium? A X B X – W C Y – W D Z – Y

Accepted Answer

B

Question 3

3 Which ion has more electrons than protons and more protons than neutrons? [H = 1 1H ; D = 2 1 H ; O = 16 8 O] A D– B H3O+ C OD– D OH–

Accepted Answer

D

Question 4

4 Which factor can affect the value of the activation energy of a reaction? A changes in concentration of the reactants B decrease in temperature C increase in temperature D the presence of a catalyst

Accepted Answer

D

Question 5

5 The diagram shows the Maxwell-Boltzmann energy distribution curves for molecules of a sample of a gas at two different temperatures. Which letter on the axes represents the most probable energy of the molecules at the lower temperature? A B C D

Accepted Answer

C

Question 6

6 Which pair of elements has chemical bonds of the same type between their atoms in the solid state? A aluminium and phosphorus B chlorine and argon C magnesium and silicon D sulfur and chlorine

Accepted Answer

D

Question 7

7 Ethanol has a boiling point of 78 °C. At 101 kPa and 79 °C ethanol vapour does not perfectly obey the gas equation pV = nRT. What is the reason for this? A Ethanol vapour is in equilibrium with ethanol liquid at 79 °C. B There are intermolecular forces between the molecules of ethanol vapour. C The vapourisation of ethanol liquid is an endothermic process. D Vapours will not obey the gas equation perfectly at such a low pressure.

Accepted Answer

B

Question 8

8 The reaction between sulfur dioxide and oxygen is a dynamic equilibrium. 2SO2(g)  +  O2(g) 2SO3(g) What happens when the pressure of the system is increased? A The rate of reaction will decrease and the position of the equilibrium will move to the left. B The rate of reaction will decrease and the position of the equilibrium will move to the right. C The rate of reaction will increase and the position of the equilibrium will move to the left. D The rate of reaction will increase and the position of the equilibrium will move to the right.

Accepted Answer

D

Question 9

9 Dicarbon monoxide, C2O, is found in dust clouds in space. Analysis of it shows that the sequence of atoms in this molecule is C – C – O. All bonds are double bonds and there are no unpaired electrons. How many lone pairs of electrons are present in a molecule of C2O? A 1 B 2 C 3 D 4

Accepted Answer

C

Question 10

10 Use of the Data Booklet is relevant to this question. A student mixed 25 cm3 of 0.10 mol dm–3 sodium hydroxide solution with 25 cm3 of 0.10 mol dm–3 hydrochloric acid and noted a temperature rise of 2.5 °C. What is the enthalpy change of the reaction per mole of NaOH? A –209 kJ mol–1 B –104.5 kJ mol–1 C –209 J mol–1 D –522.5 J mol–1

Accepted Answer

A

Question 11

11 Which energy change corresponds to the enthalpy change of atomisation of hydrogen at 298 K? A the bond energy of a H – H bond B half the bond energy of a H – H bond C minus half the bond energy of a H – H bond D minus the bond energy of a H – H bond

Accepted Answer

B

Question 12

12 Propanone has molecular formula C3H6O. The enthalpy change of combustion of hydrogen is –286 kJ mol–1. The enthalpy change of combustion of carbon is –394 kJ mol–1. The enthalpy change of formation of propanone is –254 kJ mol–1. Using this information, what is the enthalpy change of combustion of propanone? A –2644 kJ mol–1 B –2294 kJ mol–1 C –1786 kJ mol–1 D –426 kJ mol–1

Accepted Answer

C

Question 13

13 Use of the Data Booklet is relevant to this question. Magnesium nitrate, Mg(NO3)2, will decompose when heated to give a white solid and a mixture of gases. One of the gases released is oxygen. 29.7 g of anhydrous magnesium nitrate is heated until no further reaction takes place. What mass of oxygen is produced? A 3.2 g B 6.4 g C 12.8 g D 19.2 g

Accepted Answer

A

Question 14

14 In which row of the table are all statements comparing the compounds of calcium and barium correct? solubility of solubility of thermal stability of thermal stability of calcium hydroxide barium hydroxide calcium carbonate barium carbonate A higher lower higher lower B higher lower lower higher C lower higher higher lower D lower higher lower higher

Accepted Answer

D

Question 15

15 Many modern cars are fitted with halogen lamps. When such lamps are first switched on, a distinct purple colour can be seen. Which species is responsible for this purple colour? A I2(s) B I2(l) C I2(g) D I(g)

Accepted Answer

C

Question 16

16 The trends in three physical properties of the elements Na, Mg, Al, Si, P and S are shown in the graphs. 0 0 0 Na Mg Al Si P S Na Mg Al Si P S Na Mg Al Si P S Which physical property is not illustrated? A atomic radius B electrical conductivity C first ionisation energy D melting point

Accepted Answer

B

Question 17

17 Which statement about ammonia is completely correct? A Ammonia acts as a nucleophile by accepting a pair of electrons when it reacts with bromoethane. B Ammonia can form a co-ordinate bond with a hydrogen ion to form an ammonium ion. C Ammonia is a base and accepts hydroxide ions. D The shape of the ammonia molecule is pyramidal with bond angles of 109.5°.

Accepted Answer

B

Question 18

18 What happens when bromine solution is added to a solution of sodium iodide? A A reaction occurs without changes in oxidation state. B Bromine atoms are oxidised, iodide ions are reduced. C Bromine atoms are reduced, iodide ions are oxidised. D No reaction occurs.

Accepted Answer

C

Question 19

19 The halogens exist as diatomic molecules, X2. The boiling points of the Group VII elements increase as the group is descended from chlorine to iodine. Which statement helps to explain this increase in boiling point as Group VII is descended? A The electronegativity of X decreases as the group is descended. B The number of electrons in each X2 molecule increases as the group is descended. C The size of the permanent dipole in the X2 molecule increases as the group is descended. D The X–X bond strength increases as the group is descended.

Accepted Answer

B

Question 20

20 The compound hex-3-en-1-ol, P, has a strong ‘leafy’ smell of newly cut grass and is used in perfumery. CH3CH2CH=CHCH2CH2OH P What is produced when P is treated with an excess of hot concentrated acidified KMnO4? A CH3CH2CH(OH)CH(OH)CH2CH2OH B CH3CH2CH=CHCH2CO2H C CH3CH2CHO and OCHCH2CH2OH D CH3CH2CO2H and HO2CCH2CO2H

Accepted Answer

D

Question 21

21 Sorbic acid is used as a food preservative because it kills fungi and moulds. H H O C C C H3C C C OH H H sorbic acid Sorbic acid will react with • hydrogen in the presence of a nickel catalyst, • bromine in an organic solvent. How many moles of hydrogen and of bromine will be incorporated into one mole of sorbic acid by these reactions? moles of hydrogen moles of bromine A 2 2 1 B 2 2 2 C 3 2 1 D 3 2 2

Accepted Answer

A

Question 22

22 When heated with chlorine, the hydrocarbon 2,2-dimethylbutane undergoes free radical substitution. In a propagation step a free radical X• is formed. CH3 CH3CH2 C CH3  +  Cl • →  X• +  HCl CH3 How many different forms of X• are possible? A 1 B 2 C 3 D 4

Accepted Answer

C

Question 23

23 Aqueous sodium hydroxide reacts with 2-bromo-2-methylpropane to give 2-methylpropan-2-ol. The reaction proceeds by an SN1 mechanism. How should the first step in the mechanism be described? A by a curly arrow from a lone pair on the OH– ion to the Cδ+ atom of 2-bromopropane B by a curly arrow from the C–Br bond to the Br atom C by a curly arrow from the C–Br bond to the C atom D by the homolytic fission of the C–Br bond

Accepted Answer

B

Question 24

24 Compound Y can be hydrolysed by warm aqueous silver nitrate to form a precipitate that is soluble in dilute aqueous ammonia. Compound Y can undergo an elimination reaction to form an alkene. What could be the skeletal formula of compound Y? A B C D Br I Cl Cl

Accepted Answer

C

Question 25

25 The compound shown is menthol, a naturally-occurring alcohol found in peppermint oil. OH menthol When menthol is heated with concentrated sulfuric acid it reacts. The products that form include compound T. What could be the structure of compound T? A B C D O

Accepted Answer

D

Question 26

26 Use of the Data Booklet is relevant to this question. Which volume of oxygen measured at room temperature and pressure is needed for complete combustion of 0.1 mol of propan-1-ol? A 10.8 dm3 B 12.0 dm3 C 21.6 dm3 D 24.0 dm3

Accepted Answer

A

Question 27

27 Which carbonyl compound reacts with hydrogen cyanide to form a product that has no chiral carbon atom? A butanone B ethanal C propanal D propanone

Accepted Answer

D

Question 28

28 How many of the following compounds produce a carboxylic acid on heating under reflux with hot acidified K2Cr2O7? CH3CH2CHO CH3COCH3 CH3CH2CH2OH CH3CHOHCH3 A 1 B 2 C 3 D 4

Accepted Answer

B

Question 29

29 Compound Y has Mr of 88. It does not fizz when added to a solution of sodium hydrogencarbonate. It can be hydrolysed by dilute sulfuric acid to produce two organic products with Mr values of 46 and 60. What is the identity of compound Y? A butanoic acid B ethyl ethanoate C 3-hydroxybutanal D butyl methanoate

Accepted Answer

B

Question 30

30 Polymerisation of ethene gives poly(ethene). How does the carbon-carbon bond in poly(ethene) compare with that in ethene? A The carbon-carbon bond is longer and stronger in poly(ethene). B The carbon-carbon bond is longer and weaker in poly(ethene). C The carbon-carbon bond is shorter and stronger in poly(ethene). D The carbon-carbon bond is shorter and weaker in poly(ethene).

Accepted Answer

B

Question 31

31 Use of the Data Booklet is relevant to this question. In which pairs do both species have the same number of unpaired p electrons? 1 Al 2– and O+ 2 N and Cl 2+ 3 C and Cl +

Accepted Answer

A

Question 32

32 The diagram shows the reaction pathway for a reversible reaction. energy 90 / kJ mol–1 30 extent of reaction Which statements are correct? 1 The enthalpy change for the backward reaction is +90 kJ mol–1. 2 The forward reaction is exothermic. 3 The enthalpy change for the forward reaction is –30 kJ mol–1.

Accepted Answer

C

Question 33

33 Which substances contain delocalised electrons? 1 cyclohexene 2 graphite 3 sodium

Accepted Answer

C

Question 34

34 Solids W, X, Y and Z are compounds of two different Group II metals. Some of their applications are described below. Compound W is used as a refractory lining material in kilns. Compound X is used as a building material. It can also be heated in a kiln to form compound Y. When Y is hydrated, it forms compound Z which is used agriculturally to treat soils. Which statements about these compounds are correct? 1 Adding W to water has less effect on pH than adding Y. 2 Adding Z to soil increases the pH of the soil. 3 The metallic element in Y reacts with cold water more quickly than the metallic element in W.

Accepted Answer

A

Question 35

35 Which properties increase in the sequence hydrogen chloride, hydrogen bromide and hydrogen iodide? 1 thermal stability 2 bond length 3 ease of oxidation

Accepted Answer

C

Question 36

36 Sulfur dioxide is an atmospheric pollutant that causes acid rain. One of the reactions in this process is the oxidation of sulfur dioxide to sulfur trioxide. This oxidation takes place by a two stage reaction involving oxygen and nitrogen monoxide, NO. NO  +  2 1 O2  →  NO2 NO2  +  SO2  →  SO3  +  NO Which statements are correct? 1 Nitrogen monoxide is acting as a catalyst for the oxidation. 2 Nitrogen atoms are oxidised in the second stage. 3 Oxygen atoms are first reduced and are then oxidised.

Accepted Answer

D

Question 37

37 Which are properties of fluoroalkanes? 1 They are less reactive than the corresponding chloroalkanes. 2 They are non-flammable. 3 The C–F bond is stronger than the C–Cl bond.

Accepted Answer

A

Question 38

38 What can be produced when an aqueous solution of butan-2-ol is oxidised under suitable conditions? 1 butanone 2 butanoic acid 3 butanal

Accepted Answer

D

Question 39

39 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.

Accepted Answer

A

Question 40

40 An organic compound, Z, will react with calcium metal to produce a salt with the empirical formula CaC4H6O4. What could be the identity of Z? 1 ethanoic acid 2 butanedioic acid 3 methylpropanedioic acid

Accepted Answer

D

Question paper16 pages

Mark scheme2 pages

Questions as text

Q1 · During the electrolysis of molten aluminium oxide to produce aluminium, using carbon…

Q2 · Equations involving four enthalpy changes are shown

Q3 · Which ion has more electrons than protons and more protons than neutrons?

Q4 · Which factor can affect the value of the activation energy of a reaction?

Q5 · The diagram shows the Maxwell-Boltzmann energy distribution curves for molecules of a…

Q6 · Which pair of elements has chemical bonds of the same type between their atoms in the…

Q7 · Ethanol has a boiling point of 78 °C

Q8 · The reaction between sulfur dioxide and oxygen is a dynamic equilibrium

Q9 · Dicarbon monoxide, C2O, is found in dust clouds in space

Q10 · Use of the Data Booklet is relevant to this question

Q11 · Which energy change corresponds to the enthalpy change of atomisation of hydrogen at 298…

Q12 · Propanone has molecular formula C3H6O

Q13 · Use of the Data Booklet is relevant to this question

Q14 · In which row of the table are all statements comparing the compounds of calcium and…

Q15 · Many modern cars are fitted with halogen lamps

Q16 · The trends in three physical properties of the elements Na, Mg, Al, Si, P and S are shown…

Q17 · Which statement about ammonia is completely correct?

Q18 · What happens when bromine solution is added to a solution of sodium iodide?

Q19 · The halogens exist as diatomic molecules, X2

Q20 · The compound hex-3-en-1-ol, P, has a strong ‘leafy’ smell of newly cut grass and is used…

Q21 · Sorbic acid is used as a food preservative because it kills fungi and moulds

Q22 · When heated with chlorine, the hydrocarbon 2,2-dimethylbutane undergoes free radical…

Q23 · Aqueous sodium hydroxide reacts with 2-bromo-2-methylpropane to give 2-methylpropan-2-ol

Q24 · Compound Y can be hydrolysed by warm aqueous silver nitrate to form a precipitate that is…

Q25 · The compound shown is menthol, a naturally-occurring alcohol found in peppermint oil

Q26 · Use of the Data Booklet is relevant to this question

Q27 · Which carbonyl compound reacts with hydrogen cyanide to form a product that has no chiral…

Q28 · How many of the following compounds produce a carboxylic acid on heating under reflux…

Q29 · Compound Y has Mr of 88

Q30 · Polymerisation of ethene gives poly(ethene)

Q31 · Use of the Data Booklet is relevant to this question

Q32 · The diagram shows the reaction pathway for a reversible reaction

Q33 · Which substances contain delocalised electrons?

Q34 · Solids W, X, Y and Z are compounds of two different Group II metals

Q35 · Which properties increase in the sequence hydrogen chloride, hydrogen bromide and…

Q36 · Sulfur dioxide is an atmospheric pollutant that causes acid rain

Q37 · Which are properties of fluoroalkanes?

Q38 · What can be produced when an aqueous solution of butan-2-ol is oxidised under suitable…

Q39 · The Mr of compound X is 72

Q40 · An organic compound, Z, will react with calcium metal to produce a salt with the…

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