Cambridge A Level Chemistry 9701 — 2013 May/June Paper 1 · Variant 3

Question 1

1 In the redox reaction shown, how do the oxidation states of vanadium and sulfur change? VO2 +  +  SO2  →  V3+  +  SO4 2– vanadium sulfur from to from to A +1 +3 0 –2 B +1 +3 +4 +6 C +5 +3 0 –2 D +5 +3 +4 +6

Accepted Answer

D

Question 2

2 Use of the Data Booklet is relevant to this question. In which species are the numbers of protons, neutrons and electrons all different? A 19 F − B 23 Na + C 31 P D 16 S 32 2 − 9 11 15

Accepted Answer

B

Question 3

3 The first six ionisation energies of four elements are given. Which element is most likely to be in Group IV of the Periodic Table? ionisation energy / kJ mol−1 1st 2nd 3rd 4th 5th 6th A 494 4 560 6 940 9 540 13 400 16 600 B 736 1 450 7 740 10 500 13 600 18 000 C 1 090 2 350 4 610 6 220 37 800 47 000 D 1 400 2 860 4 590 7 480 9 400 53 200

Accepted Answer

C

Question 4

4 The diagram represents, for a given temperature, the Boltzmann distribution of the kinetic energies of the molecules in a mixture of two gases that will react together. The activation energy for the reaction, Ea , is marked. number of molecules Ea energy The dotted curves below show the Boltzmann distribution for the same reaction at a higher temperature. On these diagrams, H represents the activation energy at the higher temperature. Which diagram is correct? A B number of number of molecules molecules Ea energy Ea energy H H C D number of number of molecules molecules Ea energy Ea energy H H

Accepted Answer

C

Question 5

5 Crotonaldehyde, CH3CH=CHCHO, can be obtained by oxidising butadiene, CH2=CHCH=CH2, using air or oxygen. One method is to pass a mixture of butadiene and oxygen through a hot aqueous solution of palladium(II) ions, Pd2+(aq), which catalyse the reaction. Which statement is not correct about the action of the Pd2+(aq) ions? A Changing the concentration of the Pd2+(aq) will have an effect on the rate of the reaction. B Pd2+(aq) increases the energy of the reacting molecules. C Pd2+(aq) lowers the activation energy for the reaction. D Pd2+(aq) provides a different route for the reaction.

Accepted Answer

B

Question 6

6 Which least resembles an ideal gas at room temperature and pressure? A ammonia B helium C hydrogen D methane

Accepted Answer

A

Question 7

7 Use of the Data Booklet is relevant to this question. When 0.15 g of an organic compound is vaporised, it occupies a volume of 65.0 cm3 at 405 K and 1.00 × 105 Nm–2. Using the expression pV = nRT, which of the following expressions should be used to calculate the relative molecular mass, Mr, of the compound? 0 . 15 × 65 × 10 − 6 × 1 × 10 5 A 8 . 31 × 405 B 0 . 15 × 8 . 31 × 405 1 × 10 5 × 65 × 10 − 3 0 . 15 × 65 × 10 − 3 × 1 × 10 5 C 8 . 31 × 405 D 0 . 15 × 8 . 31 × 405 1 × 10 5 × 65 × 10 − 6

Accepted Answer

D

Question 8

8 Which compound is the only gas at room temperature and pressure? A CH3CH2CH2NH2 Mr = 59.0 B CH3CH2CH2OH Mr = 60.0 C CH2OHCH2OH Mr = 62.0 D CH3CH2Cl Mr = 64.5

Accepted Answer

D

Question 9

9 Which formula represents the empirical formula of a compound? A CH4O B C2H4 C C6H12 D H2O2

Accepted Answer

A

Question 10

10 Use of the Data Booklet is relevant to this question. A washing powder contains sodium hydrogencarbonate, NaHCO3, as one of the ingredients. In a titration, a solution containing 1.00 g of washing powder requires 7.15 cm3 of 0.100 mol dm–3 sulfuric acid for complete reaction. The sodium hydrogencarbonate is the only ingredient that reacts with the acid. What is the percentage by mass of sodium hydrogencarbonate in the washing powder? A 3.0 B 6.0 C 12.0 D 24.0

Accepted Answer

C

Question 11

11 Use of the Data Booklet is relevant to this question. This question should be answered using bond enthalpy data. The equation for the complete combustion of methanal is given below. H2C=O  +  O2  →  CO2  +  H2O What is the enthalpy change of combustion of methanal? A +416 kJ mol–1 B +396 kJ mol–1 C –344 kJ mol–1 D –690 kJ mol–1

Accepted Answer

C

Question 12

12 Use of the Data Booklet is relevant to this question. Anhydrous magnesium nitrate, Mg(NO3)2 , will decompose when heated, giving a white solid and a mixture of two gases X and Y. Y is oxygen. mass of X released What is the ratio ? mass of Y released A 1 B 1 C 1 D 1 0 . 174 0 . 267 0 . 348 3 . 43

Accepted Answer

A

Question 13

13 In which row of the table are all statements comparing magnesium and barium correct? fourth ionisation reaction of fourth ionisation reaction of barium energy of magnesium with energy of barium with cold water magnesium cold water A higher lower faster slower B higher lower slower faster C lower higher faster slower D lower higher slower faster

Accepted Answer

B

Question 14

14 Two students, P and Q, were asked to draw bar charts to represent how some properties of the halogens and their compounds differ in magnitude. Their diagrams are shown. student P student Q ∆H o I Cl Br I 0 solubility Br Cl 0 solubility of AgX(s) in NH3(aq) ∆H o for H2(g)  +  X2(g)  →  2HX(g) Which of the student’s diagrams are correct? A both P and Q B P only C Q only D neither P nor Q

Accepted Answer

C

Question 15

15 When iodine is heated, a vapour is produced. Which row of the table correctly identifies the species in the vapour and its colour? species colour A I(g) brown B I(g) purple C I2(g) brown D I2(g) purple

Accepted Answer

D

Question 16

16 How do the strengths of the covalent bonds within molecules, and the van der Waals’ forces between molecules, vary going down Group VII from chlorine to bromine to iodine? strength of strength of covalent bonds van der Waals’ forces A decrease decrease B decrease increase C increase decrease D increase increase

Accepted Answer

B

Question 17

17 Graphs can be drawn to show the percentage of ammonia at equilibrium when nitrogen and hydrogen are mixed at different temperatures and pressures. Which diagram correctly represents these two graphs? A B 40 40 400 °C 500 °C % NH3 at % NH3 at 20 20 equilibrium equilibrium 500 °C 400 °C 00 00 10 20 10 20 pressure / 103 kPa pressure / 103 kPa C D 40 40 500 °C 400 °C % NH3 at % NH3 at 20 400 °C 20 500 °C equilibrium equilibrium 0 0 0 0 10 20 10 20 pressure / 103 kPa pressure / 103 kPa

Accepted Answer

D

Question 18

18 In a famous experiment, Wöhler heated ‘inorganic’ ammonium cyanate in the absence of air. The only product of the reaction was ‘organic’ urea, CO(NH2)2. No other products were formed in the reaction. What is the formula of the cyanate ion present in ammonium cyanate? A CNO– B CNO2– C CO– D NO–

Accepted Answer

A

Question 19

19 Transition elements and their compounds are important as catalysts. In which process is a transition element compound used, rather than the element itself? A catalytic converters B Contact process C Haber process D hydrogenation of oils

Accepted Answer

B

Question 20

20 Ethene reacts with steam in the presence of sulfuric acid. C2H4  +  H2O  →  CH3CH2OH What type of reaction is this? A acid / base B addition C hydrolysis D substitution

Accepted Answer

B

Question 21

21 What is true of every nucleophile? A It attacks a double bond. B It has a lone pair of electrons. C It is a single atom. D It is negatively charged.

Accepted Answer

B

Question 22

22 How many isomers, including structural and stereoisomers, with the formula C4H8 have structures that involve π bonding? A 1 B 2 C 3 D 4

Accepted Answer

D

Question 23

23 Burnt sugar has a characteristic smell caused partly by the following compound. O CH3 C CHO This compound contains two functional groups. Which reagent will react with both functional groups? A acidified potassium dichromate(VI) B Fehling’s solution C hydrogen cyanide D sodium hydroxide

Accepted Answer

C

Question 24

24 Which sequence of reagents may be used in the laboratory to convert propan-1-ol into 2-bromopropane? A concentrated sulfuric acid, followed by bromine B concentrated sulfuric acid, followed by hydrogen bromide C ethanolic sodium hydroxide, followed by bromine D ethanolic sodium hydroxide, followed by hydrogen bromide

Accepted Answer

B

Question 25

25 A carbanion is an organic ion in which a carbon atom has a negative charge. A carbocation is an organic ion in which a carbon atom has a positive charge. What is involved in the mechanism of the reaction between aqueous sodium hydroxide and 2-bromo-2-methylbutane? A heterolytic bond fission followed by an attack by an electrophile on a carbanion B heterolytic bond fission followed by an attack by a nucleophile on a carbocation C homolytic bond fission followed by an attack by an electrophile on a carbanion D homolytic bond fission followed by an attack by a nucleophile on a carbocation

Accepted Answer

B

Question 26

26 Which compound gives an organic product with a lower boiling point when it is heated under reflux with an excess of acidified potassium dichromate(VI)? A 2-methylbutan-1-ol B 2-methylbutan-2-ol C pentan-1-ol D pentan-2-ol

Accepted Answer

D

Question 27

27 Use of the Data Booklet is relevant to this question. Which volume of oxygen, at room temperature and pressure, is needed for complete combustion of 0.1 mol of ethanol? A 7.2 dm3 B 8.4 dm3 C 14.4 dm3 D 16.8 dm3

Accepted Answer

A

Question 28

28 Cyclohexene, shown below, can form an addition polymer. Which structure represents a section of the polymer including two cyclohexene residues? A B C D

Accepted Answer

C

Question 29

29 How many isomeric esters, including structural isomers and stereoisomers, can be made with the molecular formula C5H10O2, if methanoic acid is one of the two reactants used? A 2 B 3 C 4 D 5

Accepted Answer

D

Question 30

30 CCl 2FCCl F2 can be converted into CH2FCF3 by the following route. step 1 step 2 step 3 CCl 2FCCl F2 CCl 3CF3 CCl 2FCF3 CH2FCF3 What type of reaction is step 1? A addition B elimination C isomerisation D oxidation

Accepted Answer

C

Question 31

31 A space shuttle’s upward thrust came from the following reaction between aluminium and ammonium perchlorate. 10Al  +  6NH4Cl O4  →  4Al 2O3  +  2Al Cl 3  +  12H2O  +  3N2 Which statements about this reaction are correct? 1 Aluminium is oxidised. 2 Chlorine is reduced. 3 Nitrogen is oxidised.

Accepted Answer

A

Question 32

32 Use of the Data Booklet is relevant to this question. Which statements are correct when referring to the atoms 23Na and 24Mg? 1 They have the same number of full electron orbitals. 2 They have the same number of neutrons. 3 They are both reducing agents.

Accepted Answer

C

Question 33

33 The reaction pathway for a reversible reaction is shown below. 50 energy / kJ mol–1 20 extent of reaction Which statements are correct? 1 The enthalpy change for the backward reaction is –20 kJ mol–1. 2 The forward reaction is endothermic. 3 The activation energy for the forward reaction is +70 kJ mol–1.

Accepted Answer

A

Question 34

34 Which diagrams represent part of a giant molecular structure? 1 2 3 = C = C = Na = Cl

Accepted Answer

B

Question 35

35 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 More acid is neutralised by 2.0 g of X than by 2.0 g of W. 2 The Mr of X is greater than the Mr of Y by 44.0. 3 The metallic element in Y reacts with cold water more quickly then the metallic element in W.

Accepted Answer

C

Question 36

36 Element J is a solid. It occurs as a contaminant of fossil fuels. Its oxide K is formed in car engines. In the atmosphere, K can be further oxidised to L. Which statements about J, K and L are correct? 1 Atoms of J have paired p electrons. 2 The atmospheric oxidation of K to L is a catalysed reaction. 3 With water, L forms a strong acid.

Accepted Answer

A

Question 37

37 During the bromination of methane, the free radical CH3• is generated. A possible terminating step of this reaction is the formation of C2H6 by the combination of two free radicals. What could be produced in a terminating step during the bromination of propane? CH3 1 CH3CH2CH2CHCH3 CH3 2 CH3CHCHCH3 CH3 CH3 3 CH3CH2CHCH2CH3

Accepted Answer

B

Question 38

38 Fabrics for use in aircraft seating are treated with a coating containing a halogenoalkane. Why is this coating used? 1 The treated fabric burns less easily, improving safety. 2 The treated fabric forms hydrogen bonds to water more readily, so it is easier to wash. 3 The halogenoalkane undergoes addition polymerisation, stiffening the fabric.

Accepted Answer

D

Question 39

39 A liquid X is known to be either a single organic compound or a mixture of organic compounds. When treated with sodium, X gives off hydrogen gas. When treated with 2,4-dinitrophenylhydrazine reagent, X gives orange crystals. Which deductions about X can definitely be made? 1 At least one component of X is a carbonyl compound. 2 Only one of the components of X is a carbonyl compound. 3 At least one component of X is an alcohol.

Accepted Answer

D

Question 40

40 Ethanoic acid, CH3CO2H, is an important chemical which is used in the industrial manufacture of rayon and aspirin. Which processes can be used to make ethanoic acid? 1 hydrolysis of ethanenitrile 2 oxidation of ethanol 3 oxidation of ethanal

Accepted Answer

A

Question paper16 pages

Mark scheme2 pages

Questions as text

Q1 · In the redox reaction shown, how do the oxidation states of vanadium and sulfur change?

Q2 · Use of the Data Booklet is relevant to this question

Q3 · The first six ionisation energies of four elements are given

Q4 · The diagram represents, for a given temperature, the Boltzmann distribution of the…

Q5 · Crotonaldehyde, CH3CH=CHCHO, can be obtained by oxidising butadiene, CH2=CHCH=CH2, using…

Q6 · Which least resembles an ideal gas at room temperature and pressure?

Q7 · Use of the Data Booklet is relevant to this question

Q8 · Which compound is the only gas at room temperature and pressure?

Q9 · Which formula represents the empirical formula of a compound?

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

Q11 · Use of the Data Booklet is relevant to this question

Q12 · Use of the Data Booklet is relevant to this question

Q13 · In which row of the table are all statements comparing magnesium and barium correct?

Q14 · Two students, P and Q, were asked to draw bar charts to represent how some properties of…

Q15 · When iodine is heated, a vapour is produced

Q16 · How do the strengths of the covalent bonds within molecules, and the van der Waals’…

Q17 · Graphs can be drawn to show the percentage of ammonia at equilibrium when nitrogen and…

Q18 · In a famous experiment, Wöhler heated ‘inorganic’ ammonium cyanate in the absence of air

Q19 · Transition elements and their compounds are important as catalysts

Q20 · Ethene reacts with steam in the presence of sulfuric acid

Q21 · What is true of every nucleophile?

Q22 · How many isomers, including structural and stereoisomers, with the formula C4H8 have…

Q23 · Burnt sugar has a characteristic smell caused partly by the following compound

Q24 · Which sequence of reagents may be used in the laboratory to convert propan-1-ol into…

Q25 · A carbanion is an organic ion in which a carbon atom has a negative charge

Q26 · Which compound gives an organic product with a lower boiling point when it is heated…

Q27 · Use of the Data Booklet is relevant to this question

Q28 · Cyclohexene, shown below, can form an addition polymer

Q29 · How many isomeric esters, including structural isomers and stereoisomers, can be made…

Q30 · CCl 2FCCl F2 can be converted into CH2FCF3 by the following route

Q31 · A space shuttle’s upward thrust came from the following reaction between aluminium and…

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

Q33 · The reaction pathway for a reversible reaction is shown below

Q34 · Which diagrams represent part of a giant molecular structure?

Q35 · Solids W, X, Y and Z are compounds of two different Group II metals

Q36 · Element J is a solid

Q37 · During the bromination of methane, the free radical CH3• is generated

Q38 · Fabrics for use in aircraft seating are treated with a coating containing a halogenoalkane

Q39 · A liquid X is known to be either a single organic compound or a mixture of organic…

Q40 · Ethanoic acid, CH3CO2H, is an important chemical which is used in the industrial…

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