Cambridge A Level Chemistry 9701 — 2014 Oct/Nov Paper 1 · Variant 2

Question 1

1 Which solid-line curve most accurately represents the distribution of molecular energies in a gas at 500 K if the dotted-line curve represents the corresponding distribution for the same gas at 300 K? A B number of number of molecules molecules molecular energy molecular energy C D number of number of molecules molecules molecular energy molecular energy

Accepted Answer

A

Question 2

2 In which reaction does hydrogen behave as an oxidising agent? A H2  +  Cl 2  →  2HCl B C2H4  +  H2  →  C2H6 C N2  +  3H2  →  2NH3 D 2Na  +  H2  →  2NaH

Accepted Answer

D

Question 3

3 Ethanol is increasingly being used as a fuel for cars. The standard enthalpy change of formation of carbon dioxide is –393 kJ mol–1. The standard enthalpy change of formation of water is –286 kJ mol–1. The standard enthalpy change of formation of ethanol is –277 kJ mol–1. What is the standard enthalpy change of combustion of ethanol? A –1921 kJ mol–1 B –1367 kJ mol–1 C –956 kJ mol–1 D – 402 kJ mol–1

Accepted Answer

B

Question 4

4 Two glass vessels M and N are connected by a closed valve. M N M contains helium at 20 °C at a pressure of 1 × 105 Pa. N has been evacuated, and has three times the volume of M. In an experiment, the valve is opened and the temperature of the whole apparatus is raised to 100 °C. What is the final pressure in the system? A 3.18 × 104 Pa B 4.24 × 104 Pa C 1.25 × 105 Pa D 5.09 × 105 Pa

Accepted Answer

A

Question 5

5 The table shows the physical properties of four substances. Which substance could be hydrogen chloride? electrical electrical electrical melting point conductivity conductivity conductivity / °C of aqueous of solid of liquid solution A –119 poor poor insoluble B –115 poor poor good C –50 poor poor poor D 993 poor good good

Accepted Answer

B

Question 6

6 Aluminium carbide, Al 4C3, reacts readily with aqueous sodium hydroxide. The two products of the reaction are NaAl O2 and a hydrocarbon. Water molecules are also involved as reactants. What is the formula of the hydrocarbon? A CH4 B C2H6 C C3H8 D C6H12

Accepted Answer

A

Question 7

7 In an experiment to calculate the enthalpy change of combustion of a fuel, 1.5 g (0.0326 mol) of the fuel was used to heat 200 g of water. The temperature of the water rose from 25 °C to 55 °C. The specific heat capacity of water is 4.18 J g–1 K–1. There is significant heat loss in this experiment. Therefore, the experimental value for the enthalpy change of combustion, ∆Hc, of the fuel will be different from the theoretical value. Using the information above, what is the experimental value for the enthalpy change of combustion, ∆Hc, of the fuel? A –1410 kJ mol–1 B –769 kJ mol–1 C –30.7 kJ mol–1 D –16.7 kJ mol–1

Accepted Answer

B

Question 8

8 The reaction pathway diagram below illustrates the energies of the reactants, the products and the transition state of a reaction. transition state E1 E2 energy reactants E3 products extent of reaction Which expression represents the activation energy of the forward reaction? A E1 – E2 B E2 – E1 C E2 – E3 D E3 – E2

Accepted Answer

A

Question 9

9 Methylpropan-1-ol and butan-1-ol are structural isomers. Methylpropan-1-ol has a lower boiling point. Which statement explains why the boiling point of methylpropan-1-ol is lower than that of butan-1-ol? A Methylpropan-1-ol cannot form hydrogen bonds. B Methylpropan-1-ol has weaker covalent bonds than butan-1-ol. C Methylpropan-1-ol has weaker van der Waals’ forces than butan-1-ol. D Methylpropan-1-ol molecules have more surface area than butan-1-ol molecules.

Accepted Answer

C

Question 10

10 Which row correctly describes the electrodes used in the electrolysis cell for the production of aluminium? anode cathode A carbon carbon B carbon steel C steel carbon D steel steel

Accepted Answer

A

Question 11

11 For which equation is the enthalpy change correctly described as an enthalpy change of formation? A C(g)  +  O2(g)  →  CO2(g) B C(s)  +  2 1 O2(g)  →  CO(g) C 2N(g)  +  4O(g)  →  N2O4(g) D 2NO(g)  +  O2(g)  →  2NO2(g)

Accepted Answer

B

Question 12

12 Element X, in Period 3, has the following properties. ● Its oxide has a giant structure. ● It forms covalent bonds with chlorine. ● Its oxide will neutralise HCl (aq). What is element X? A Mg B Al C Si D P

Accepted Answer

B

Question 13

13 Which property is not associated with the element sodium? A It can react with cold water to form hydrogen. B It forms a basic oxide. C It forms a neutral chloride. D It is an oxidising agent.

Accepted Answer

D

Question 14

14 Use of the Data Booklet is relevant to this question. Sir Humphrey Davy discovered boron, calcium, magnesium and sodium. Which of these elements 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

Accepted Answer

C

Question 15

15 Use of the Data Booklet is relevant to this question. A sample of potassium oxide, K2O, is dissolved in 250 cm3 of distilled water. 25.0 cm3 of this solution is titrated against sulfuric acid of concentration 2.00 mol dm–3. 15.0 cm3 of this sulfuric acid is needed for complete neutralisation. Which mass of potassium oxide was originally dissolved in 250 cm3 of distilled water? A 2.83 g B 28.3 g C 47.1 g D 56.6 g

Accepted Answer

B

Question 16

16 Chlorine gas reacts with cold aqueous sodium hydroxide. It can also react with hot aqueous sodium hydroxide. What are the oxidation numbers of chlorine in the products of these reactions? cold aqueous hot aqueous sodium hydroxide sodium hydroxide A –1, +1 –1, +5 B –1, +1 +1, +6 C –1, +2 –1, +5 D –1, +2 +1, +6

Accepted Answer

A

Question 17

17 Under standard conditions, which statement is correct? A Cl –(aq) can oxidise Br2(aq). B Cl –(aq) can reduce Br2(aq). C Cl 2(aq) can oxidise Br –(aq). D Cl 2(aq) can reduce Br –(aq).

Accepted Answer

C

Question 18

18 Total removal of the pollutant sulfur dioxide, SO2, is difficult. The quantities emitted from furnace chimneys can be lowered by using desulfurisation plants. The gases are reacted with calcium hydroxide to remove the SO2. What is the main product formed initially? A Ca(HSO4)2 B CaS C CaSO3 D CaSO4

Accepted Answer

C

Question 19

19 Which oxide does not react with cold dilute sodium hydroxide to produce a salt? A Al 2O3 B P4O10 C SO2 D SiO2

Accepted Answer

D

Question 20

20 Which row correctly describes the reaction between propene and bromine, Br2(l)? reaction mechanism organic product A electrophilic addition CH3CHBrCH2Br B electrophilic addition CH3CH2CH2Br C nucleophilic substitution CH3CH2CH2Br D nucleophilic substitution CH3CHBrCH2Br

Accepted Answer

A

Question 21

21 Use of the Data Booklet is relevant to this question. Which compound has an Mr of 84 and will react with HBr to give a product with an Mr of 164.9? A B C D O

Accepted Answer

D

Question 22

22 1,1-dichloropropane reacts with aqueous sodium hydroxide in a series of steps to give propanal. NaOH(aq) CH3CH2CHCl 2 CH3CH2CHO Which term describes the first step of this reaction? A addition B elimination C oxidation D substitution

Accepted Answer

D

Question 23

23 Considering only structural isomers, what is the number of alcohols of each type with the formula C5H12O? primary secondary tertiary A 3 3 2 B 4 2 2 C 4 3 1 D 5 2 1

Accepted Answer

C

Question 24

24 Lactic acid, CH3CH(OH)CO2H, causes pain when it builds up in muscles. Which reagent reacts with both of the –OH groups in lactic acid? A acidified potassium dichromate(VI) B ethanol C sodium D sodium hydroxide

Accepted Answer

C

Question 25

25 In the hydrolysis of bromoethane by aqueous sodium hydroxide, what is the nature of the attacking group and of the leaving group? attacking group leaving group A electrophile electrophile B electrophile nucleophile C nucleophile electrophile D nucleophile nucleophile

Accepted Answer

D

Question 26

26 Corticosterone is a hormone involved in the metabolism of carbohydrates and proteins. O OH CH3 HO CH3 O corticosterone How many chiral centres are there in one molecule of corticosterone? A 5 B 6 C 7 D 8

Accepted Answer

C

Question 27

27 Methyl methylpropenoate is the monomer used to make Perspex. Which diagram correctly shows methyl methylpropenoate? A B CH3 CH2 C CH3 CH CH CO2CH3 CO2CH3 C D CH3 CH2 CH CO2CH2CH3 C CH CO2CH3 CH3

Accepted Answer

A

Question 28

28 The ester CH3CH2CH2CO2CH3 is responsible for the aroma of apples. When this ester is hydrolysed by acid in the stomach, what is the empirical formula of the organic acid produced? A CH2O B CH4O C C2H4O D C3H6O2

Accepted Answer

C

Question 29

29 Which equation correctly represents the balanced equation for the complete combustion of a hydrocarbon with the formula CxHy? A y )O2  →  xCO2  +  2 y H2O CxHy  +  (x + 2 B y )O2  →  xCO2  +  yH2O CxHy  +  (x + 4 C y )O2  →  xCO2  +  4 y H2O CxHy  +  (x + 4 D y )O2  →  xCO2  +  2 y H2O CxHy  +  (x + 4

Accepted Answer

D

Question 30

30 β-carotene is responsible for the orange colour of carrots. CH3 CH3 CH3 CH3 CH3 CH3 CH3 CH3 CH3 CH3 β-carotene β-carotene is oxidised by hot, concentrated, acidified KMnO4. When an individual molecule of β-carotene is oxidised in this way, many product molecules are formed. How many of these product molecules contain a ketone functional group? A 4 B 6 C 9 D 11

Accepted Answer

B

Question 31

31 Use of the Data Booklet is relevant to this question. Which ions contain one or more unpaired electrons? 1 Cu2+ 2 Mn3+ 3 V3+

Accepted Answer

A

Question 32

32 Use of the Data Booklet is relevant to this question. The bond energy of the Br – O bond is 235 kJ mol–1. Which reactions are exothermic? 1 OH•  +  HBr  →  H2  +  BrO• 2 OH•  +  HBr  →  H2O  +  Br• 3 H•  +  HBr  →  H2  +  Br•

Accepted Answer

C

Question 33

33 A reversible reaction is catalysed. Which statements about the effects of the catalyst on this system are correct? 1 The catalyst alters the mechanism of the reaction. 2 The catalyst reduces the activation energy for both the forward and the backward reaction. 3 The catalyst alters the composition of the equilibrium mixture.

Accepted Answer

B

Question 34

34 A student borrowed a friend’s chemistry notes and copied out the notes in the box below. Which statements are correct? A gas behaves less like an ideal gas when the gas 1 is at low pressure. 2 is at low temperature. 3 can be easily liquefied.

Accepted Answer

C

Question 35

35 On being heated, hydrogen iodide breaks down more quickly than hydrogen chloride. Which statements explain this faster rate? 1 The HI bond is weaker than the HCl bond. 2 The reaction of the breakdown of HI has a smaller activation energy than that of HCl. 3 The breakdown of HI is more exothermic than that of HCl.

Accepted Answer

B

Question 36

36 Which statements about calcium oxide are correct? 1 It reacts with cold water. 2 It is produced when calcium nitrate is heated. 3 It can be reduced by heating with magnesium.

Accepted Answer

B

Question 37

37 Propanal will react with hydrogen cyanide to form 2-hydroxybutanenitrile. A suitable catalyst for this reaction is sodium cyanide. NaCN CH3CH2CHO  +  HCN CH3CH2CH(OH)CN Which statements about the reaction of propanal with hydrogen cyanide are correct? 1 The CN– ion attacks the propanal molecule to form an intermediate ion. 2 The product of the reaction has a chiral carbon atom. 3 The CN– ion is a stronger electrophile than the HCN molecule.

Accepted Answer

B

Question 38

38 X is an organic compound that gives a precipitate with aqueous silver nitrate. This precipitate remains undissolved when concentrated aqueous ammonia is added. What is a possible identity for X? 1 iodomethane 2 2-bromobutane 3 2-chlorobutane

Accepted Answer

D

Question 39

39 For which mixtures of reagents are the colour changes described correctly? reagents colour change 1 pentanal + hot, acidified potassium dichromate(VI) orange to green 2 pentan-2-one + warm Fehling’s reagent no change 3 cyclohexane + cold, acidified potassium manganate(VII) purple to colourless

Accepted Answer

B

Question 40

40 A reaction pathway diagram is shown. energy extent of reaction Which reactions would have this profile? 1 (CH3)3CBr  +  NaOH  →  (CH3)3COH  +  NaBr 2 CH3CH2Br  +  NaOH  →  CH3CH2OH  +  NaBr 3 (CH3)3CCH2CH2Cl  +  2NH3  →  (CH3)3CCH2CH2NH2  +  NH4Cl

Accepted Answer

D

Question paper16 pages

Mark scheme2 pages

Questions as text

Q1 · Which solid-line curve most accurately represents the distribution of molecular energies…

Q2 · In which reaction does hydrogen behave as an oxidising agent?

Q3 · Ethanol is increasingly being used as a fuel for cars

Q4 · Two glass vessels M and N are connected by a closed valve

Q5 · The table shows the physical properties of four substances

Q6 · Aluminium carbide, Al 4C3, reacts readily with aqueous sodium hydroxide

Q7 · In an experiment to calculate the enthalpy change of combustion of a fuel, 1.5 g (0.0326…

Q8 · The reaction pathway diagram below illustrates the energies of the reactants, the…

Q9 · Methylpropan-1-ol and butan-1-ol are structural isomers

Q10 · Which row correctly describes the electrodes used in the electrolysis cell for the…

Q11 · For which equation is the enthalpy change correctly described as an enthalpy change of…

Q12 · Element X, in Period 3, has the following properties

Q13 · Which property is not associated with the element sodium?

Q14 · Use of the Data Booklet is relevant to this question

Q15 · Use of the Data Booklet is relevant to this question

Q16 · Chlorine gas reacts with cold aqueous sodium hydroxide

Q17 · Under standard conditions, which statement is correct?

Q18 · Total removal of the pollutant sulfur dioxide, SO2, is difficult

Q19 · Which oxide does not react with cold dilute sodium hydroxide to produce a salt?

Q20 · Which row correctly describes the reaction between propene and bromine, Br2(l)?

Q21 · Use of the Data Booklet is relevant to this question

Q22 · 1,1-dichloropropane reacts with aqueous sodium hydroxide in a series of steps to give…

Q23 · Considering only structural isomers, what is the number of alcohols of each type with the…

Q24 · Lactic acid, CH3CH(OH)CO2H, causes pain when it builds up in muscles

Q25 · In the hydrolysis of bromoethane by aqueous sodium hydroxide, what is the nature of the…

Q26 · Corticosterone is a hormone involved in the metabolism of carbohydrates and proteins

Q27 · Methyl methylpropenoate is the monomer used to make Perspex

Q28 · The ester CH3CH2CH2CO2CH3 is responsible for the aroma of apples

Q29 · Which equation correctly represents the balanced equation for the complete combustion of…

Q30 · Β-carotene is responsible for the orange colour of carrots

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

Q32 · Use of the Data Booklet is relevant to this question

Q33 · A reversible reaction is catalysed

Q34 · A student borrowed a friend’s chemistry notes and copied out the notes in the box below

Q35 · On being heated, hydrogen iodide breaks down more quickly than hydrogen chloride

Q36 · Which statements about calcium oxide are correct?

Q37 · Propanal will react with hydrogen cyanide to form 2-hydroxybutanenitrile

Q38 · X is an organic compound that gives a precipitate with aqueous silver nitrate

Q39 · For which mixtures of reagents are the colour changes described correctly?

Q40 · A reaction pathway diagram is shown

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