Cambridge A Level Chemistry 9701 — 2008 May/June Paper 1 · Variant 1

Question 1

1 In the Basic Oxygen steel-making process the P4O10 impurity is removed by reacting it with calcium oxide. The only product of this reaction is the salt calcium phosphate, Ca3(PO4)2. In this reaction, how many moles of calcium oxide react with one mole of P4O10? A 1 B 1.5 C 3 D 6

Accepted Answer

D

Question 2

2 Use of the Data Booklet is relevant to this question. A typical solid fertiliser for use with household plants and shrubs contains the elements N, P, and K in the ratio of 15 g : 30 g :15 g per 100 g of fertiliser. The recommended usage of fertiliser is 14 g of fertiliser per 5 dm3 of water. What is the concentration of nitrogen atoms in this solution? A 0.03 mol dm–3 B 0.05 mol dm–3 C 0.42 mol dm–3 D 0.75 mol dm–3

Accepted Answer

A

Question 3

3 Skin cancer can be treated using a radioactive isotope of phosphorus, 32 P . A compound 15 containing the phosphide ion 32 15P −, wrapped in a plastic sheet, is strapped to the affected 3 area. What is the composition of the phosphide ion, 32 15P −? 3 protons neutrons electrons A 15 17 18 B 15 17 32 C 17 15 17 D 32 17 15

Accepted Answer

A

Question 4

4 When barium metal burns in oxygen, the ionic compound barium peroxide, BaO2, is formed. Which dot-and-cross diagram represents the electronic structure of the peroxide anion in BaO2? key A B C D electron from first oxygen atom electron from second oxygen atom electron from barium atom

Accepted Answer

D

Question 5

5 In this question, the methyl group, CH3, is represented by Me. Trimethylamine, Me3N, reacts with boron trifluoride, BF3, to form a compound of formula Me3N.BF3. How may this reaction be written in terms of the shapes of the reactants and products? Me Me Me Me F N A Me Me + F B F N F F B F Me Me N Me B Me B Me Me + B F F N F F F F Me Me Me Me F N C Me Me + F B N F B F F F Me Me Me Me B N D Me Me + F F N F B F F F

Accepted Answer

C

Question 6

6 The density of ice is 1.00 g cm–3. What is the volume of steam produced when 1.00 cm3 of ice is heated to 323 °C (596 K) at a pressure of one atmosphere (101 kPa)? [1 mol of a gas occupies 24.0 dm3 at 25 °C (298 K) and one atmosphere.] A 0.267 dm3 B 1.33 dm3 C 2.67 dm3 D 48.0 dm3

Accepted Answer

C

Question 7

7 Which pair of elements have 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 sulphur and chlorine

Accepted Answer

D

Question 8

8 Which diagram correctly describes the behaviour of a fixed mass of an ideal gas? (T is measured in K.) A B C D constant T constant T constant T constant p p pV pV V 0 0 0 0 0 V 0 p 0 V 0 T

Accepted Answer

D

Question 9

9 For which equation does the enthalpy change correspond to the enthalpy change of atomisation of iodine? A ½ I2(s) → I(s) B ½ I2(s) → I(g) C I2(g) → 2I(g) D I2(s) → 2I(g)

Accepted Answer

B

Question 10

10 Titanium occurs naturally as the mineral rutile, TiO2. One possible method of extraction of titanium is to reduce the rutile by heating with carbon. TiO2(s) + 2C(s) → Ti(s) + 2CO(g) The standard enthalpy changes of formation of TiO2(s) and CO(g) are –940 kJ mol–1 and –110 kJ mol–1 respectively. What is the standard enthalpy change of this reaction? A –830 kJ mol–1 B –720 kJ mol–1 C +720 kJ mol–1 D +830 kJ mol–1

Accepted Answer

C

Question 11

11 For the reaction W(aq) + 2X(aq) 2Y(aq) + 3Z(aq) what are the correct units for the equilibrium constant Kc? A mol dm–3 B mol2 dm–6 C mol–1 dm3 D mol–2 dm6

Accepted Answer

B

Question 12

12 The molecular energy distribution curve represents the variation in energy of the molecules of a gas at room temperature. proportion of molecules 0 0 energy Which curve applies for the same gas at a lower temperature? A B proportion proportion of of molecules molecules 0 0 0 0 energy energy C D proportion proportion of of molecules molecules 0 0 0 0 energy energy

Accepted Answer

C

Question 13

13 In an experiment, 0.1 g samples of Na2O, MgO, P4O10 and SO2 are added to separate 100 cm3 volumes of water. For which oxide is the resulting mixture most alkaline? A Na2O B MgO C P4O10 D SO2

Accepted Answer

A

Question 14

14 Which element is expected to show the greatest tendency to form some covalent compounds? A aluminium B calcium C magnesium D sodium

Accepted Answer

A

Question 15

15 Use of the Data Booklet is relevant to this question. The combustion of fossil fuels is a major source of increasing atmospheric carbon dioxide, with a consequential rise in global warming. Another significant contribution to carbon dioxide levels comes from the thermal decomposition of limestone, in the manufacture of cement and of lime for agricultural purposes. Cement works roast 1000 million tonnes of limestone per year and a further 200 million tonnes is roasted in kilns to make lime. What is the total annual mass output of carbon dioxide (in million tonnes) from these two processes? A 440 B 527 C 660 D 880

Accepted Answer

B

Question 16

16 Properties of chlorine, iodine and their compounds are compared. Property Q for chlorine is smaller than for iodine. What is property Q? A oxidising ability of the element B solubility of the silver halide in NH3(aq) C strength of van der Waals’ forces between the molecules of the element D thermal stability of the hydrogen halide

Accepted Answer

C

Question 17

17 Which reagent, when mixed and heated with ammonium sulphate, liberates ammonia? A aqueous bromine B dilute hydrochloric acid C limewater D acidified potassium dichromate(VI)

Accepted Answer

C

Question 18

18 The diagram represents the Haber process for the manufacture of ammonia from nitrogen and hydrogen. heat exchanger N2 + H2 catalytic converter condenser NH3 What is the purpose of the heat exchanger? A to cool the incoming gas mixture to avoid overheating the catalyst B to cool the reaction products and separate the NH3 from unused N2 and H2 C to warm the incoming gas mixture and shift the equilibrium to give more NH3 D to warm the incoming gas mixture and speed up the reaction

Accepted Answer

D

Question 19

19 Total elimination of the pollutant sulphur dioxide, SO2, is difficult, both for economic and technical reasons. Its emission can be reduced in furnace chimneys using desulphurisation plants, where the gases are scrubbed (washed) with calcium hydroxide to remove the SO2. What is the main product formed initially? A CaO B Ca(OH)2 C CaSO3 D CaSO4

Accepted Answer

C

Question 20

20 Which pair of reaction types is illustrated by the reaction sequence below? HI in CH3CO2H NaOH(aq) CH3CH=CHCH3 CH3CH2CHICH3 CH3CH2CH(OH)CH3 A electrophilic addition and electrophilic substitution B electrophilic addition and nucleophilic substitution C nucleophilic addition and electrophilic substitution D nucleophilic addition and nucleophilic substitution

Accepted Answer

B

Question 21

21 Trichloroethene is widely used as a dry-cleaning agent.
H Cl
\ 4
C=C
Ve
C Cl
With which of the following does trichloroethene react to give a chiral product?

A Br B HCl C NaCN(aq) D NaOH(aq)

Accepted Answer

A

Question 22

22 Chloroethene, CH2=CHCl, is the monomer of PVC. What are the C−C−C bond angles along the polymeric chain in PVC? A They are all 109.5°. B Half are 109.5° and half are 120°. C They are all 120°. D They are all 180°.

Accepted Answer

A

Question 23

23 Which hydrocarbon would not be collected in the inverted tube by heating pentane, CH3(CH2)3CH3, in the apparatus shown? pentane on aluminium mineral fibre oxide hydrocarbons very strong heat water A CH4 B CH3CH3 C CH3CH2CH=CH2 D CH3(CH2)8CH3

Accepted Answer

D

Question 24

24 Mevalonic acid, 3,5-dihydroxy-3-methylpentanoic acid, is involved in cholesterol formation in the body. It is an oil that occurs as a mixture of the two interchanging molecules shown in the diagram. HO CH3 HO CH3 C C I CH2 CH2 CH2 CH2 II CH2 C CH2OH CO2H O O What names are used to describe the pair of interchanging reactions I and II? A condensation and addition B dehydrogenation and hydrogenation C esterification and hydrolysis D neutralisation and acidification

Accepted Answer

C

Question 25

25 Halogenoalkanes are important molecules in organic synthetic reactions. In particular they undergo a range of nucleophilic reactions. Which reaction proceeds only by an SN1 mechanism? A CH3CH2Br + NH3 B CH3CH2CH2I + OH– C CH3CHBrCH3 + NH3 D (CH3)3CI + OH–

Accepted Answer

D

Question 26

26 An alcohol of molecular formula C4H10O2 contains two OH groups and has an unbranched carbon atom chain. On reaction with an excess of hot MnO / H+ this alcohol is converted into a compound of − 4 molecular formula C4H6O4. To which two carbon atoms in the chain of the alcohol are the two OH groups attached? A 1st and 2nd B 1st and 3rd C 1st and 4th D 2nd and 3rd

Accepted Answer

C

Question 27

27 Compound X • has the molecular formula C10H14O; • is unreactive towards mild oxidising agents. What is the structure of the compound formed by dehydration of X? A B CH2 CH2 CH CH2 CH2 CH CH CH3 C D CH3 CH3 CH CH CH2 C CH CH3

Accepted Answer

D

Question 28

28 Ethanal, CH3CHO, can be reduced using an aqueous methanolic solution of NaBH4 as the reducing agent. This is a nucleophilic addition reaction. What could be the first step of this mechanism? A attack of an H+ ion at the carbon atom of the carbonyl group B attack of an H+ ion at the oxygen atom of the carbonyl group C attack of an H– ion at the carbon atom of the carbonyl group D attack of an H– ion at the oxygen atom of the carbonyl group

Accepted Answer

C

Question 29

29 Which compound is both chiral and acidic? A B C D H CO2H CH3 OH CH2Br CH(OH)CO2H C HCO2CH CH2CO2H C CH3 H CO2H

Accepted Answer

D

Question 30

30 Compound X, C6H12O, is oxidised by acidified sodium dichromate(VI) to compound Y. Compound Y reacts with ethanol in the presence of a little concentrated sulphuric acid to give liquid Z. What is the formula of Z? A CH3(CH2)2CH=CHCO2H B CH3(CH2)4CH2COCH2CH3 C CH3(CH2)4CO2CH2CH3 D CH3CH2CO2(CH2)4CH3

Accepted Answer

C

Question 31

31 For complete combustion, 1 mol of an organic compound X was found to require 2.5 mol of molecular oxygen. Which compounds could be X? 1 C2H5OH 2 C2H2 3 CH3CHO

Accepted Answer

C

Question 32

32 Catalysts are used in many reversible reactions in the chemical industry. Vanadium(V) oxide is used in this way in the Contact process for the formation of SO3. 2SO2(g) + O2(g) 2SO3(g) What effect does vanadium(V) oxide have on this equilibrium? 1 It speeds up the forward reaction. 2 It increases the value of Kp. 3 It increases the value of Ea for the reverse reaction.

Accepted Answer

D

Question 33

33 Which statements about the properties of a catalyst are correct? 1 A catalyst increases the average kinetic energy of the reacting particles. 2 A catalyst increases the rate of the reverse reaction. 3 A catalyst has no effect on the enthalpy change of the reaction.

Accepted Answer

C

Question 34

34 Water is added to anhydrous aluminium chloride to make a 0.1 mol dm-3 solution. Which observations are correct? 1 The reaction is endothermic. 2 The solution is acidic. 3 The solution contains the ion [Al(H2O)6]3+.

Accepted Answer

C

Question 35

35 The electronic structure of the outer shell of the element radium is 7s2. Which statements will be correct for radium within its group? 1 The element will decompose water, liberating hydrogen. 2 The element will show an oxidation number of +2 in all its compounds. 3 Radium has the highest first ionisation energy.

Accepted Answer

B

Question 36

36 When the yellow liquid NCl3 is stirred into aqueous sodium hydroxide, the reaction that occurs can be represented by the following equation. 2NCl3(l) + 6NaOH(aq) → N2(g) + 3NaCl (aq) + 3NaOCl (aq) + 3H2O(l) What will be the result of this reaction? 1 The nitrogen is oxidised. 2 A bleaching solution remains after the reaction. 3 The final solution gives a precipitate with acidified silver nitrate.

Accepted Answer

C

Question 37

37 Aspirin is a widely-available pain-killer, whose properties have been known for centuries. The structure of aspirin is shown. OH C O O C CH3 O Which functional groups are present in aspirin? 1 alcohol 2 carboxylic acid 3 ester

Accepted Answer

C

Question 38

38 The structure of monosodium glutamate, a flavour enhancer, is shown. Na+ O– C CH2 CH2 CH CO2H O NH2 It may be prepared starting from the following compound. Cl CH2 CH2 CH CO2H NH2 Which set of reagents and reaction conditions could be used to prepare monosodium glutamate? 1 Heat under reflux with ethanolic KCN followed by hydrolysis with NaOH(aq). 2 Heat with sodium methanoate, HCO Na − + . 2 3 Heat under reflux with NaOH(aq).

Accepted Answer

D

Question 39

39 The compound cholesterol has the following structure. CH3 CH2 CH2 CH3 CH CH2 CH CH3 CH3 CH3 CH2 CH CH CH2 C C CH2 CH C CH CH2 HO CH2 CH Which statements are correct? 1 Cholesterol reacts with a mixture of ethanoic acid and concentrated sulphuric acid. 2 Cholesterol reacts with bromine to form a compound which has two new chiral centres. 3 Cholesterol is oxidised by acidified sodium dichromate(VI) to form an aldehyde.

Accepted Answer

B

Question 40

40 Ferulic acid is an antioxidant that occurs widely in plants. HO CH=CHCO2H CH3O ferulic acid Which reagents can react with the –CH=CHCO2H part of the molecule? 1 NaOH(aq) 2 acidified KMnO4 3 HBr

Accepted Answer

A

Question paper16 pages

Mark scheme2 pages

Questions as text

Q1 · In the Basic Oxygen steel-making process the P4O10 impurity is removed by reacting it…

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

Q3 · Skin cancer can be treated using a radioactive isotope of phosphorus, 32 P

Q4 · When barium metal burns in oxygen, the ionic compound barium peroxide, BaO2, is formed

Q5 · In this question, the methyl group, CH3, is represented by Me

Q6 · The density of ice is 1.00 g cm–3

Q7 · Which pair of elements have bonds of the same type between their atoms in the solid state?

Q8 · Which diagram correctly describes the behaviour of a fixed mass of an ideal gas?

Q9 · For which equation does the enthalpy change correspond to the enthalpy change of…

Q10 · Titanium occurs naturally as the mineral rutile, TiO2

Q11 · For the reaction W(aq) + 2X(aq) 2Y(aq) + 3Z(aq) what are the correct units for the…

Q12 · The molecular energy distribution curve represents the variation in energy of the…

Q13 · In an experiment, 0.1 g samples of Na2O, MgO, P4O10 and SO2 are added to separate 100 cm3…

Q14 · Which element is expected to show the greatest tendency to form some covalent compounds?

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

Q16 · Properties of chlorine, iodine and their compounds are compared

Q17 · Which reagent, when mixed and heated with ammonium sulphate, liberates ammonia?

Q18 · The diagram represents the Haber process for the manufacture of ammonia from nitrogen and…

Q19 · Total elimination of the pollutant sulphur dioxide, SO2, is difficult, both for economic…

Q20 · Which pair of reaction types is illustrated by the reaction sequence below?

Q21 · Trichloroethene is widely used as a dry-cleaning agent

Q22 · Chloroethene, CH2=CHCl, is the monomer of PVC

Q23 · Which hydrocarbon would not be collected in the inverted tube by heating pentane…

Q24 · Mevalonic acid, 3,5-dihydroxy-3-methylpentanoic acid, is involved in cholesterol…

Q25 · Halogenoalkanes are important molecules in organic synthetic reactions

Q26 · An alcohol of molecular formula C4H10O2 contains two OH groups and has an unbranched…

Q27 · Compound X • has the molecular formula C10H14O; • is unreactive towards mild oxidising…

Q28 · Ethanal, CH3CHO, can be reduced using an aqueous methanolic solution of NaBH4 as the…

Q29 · Which compound is both chiral and acidic?

Q30 · Compound X, C6H12O, is oxidised by acidified sodium dichromate(VI) to compound Y

Q31 · For complete combustion, 1 mol of an organic compound X was found to require 2.5 mol of…

Q32 · Catalysts are used in many reversible reactions in the chemical industry

Q33 · Which statements about the properties of a catalyst are correct?

Q34 · Water is added to anhydrous aluminium chloride to make a 0.1 mol dm-3 solution

Q35 · The electronic structure of the outer shell of the element radium is 7s2

Q36 · When the yellow liquid NCl3 is stirred into aqueous sodium hydroxide, the reaction that…

Q37 · Aspirin is a widely-available pain-killer, whose properties have been known for centuries

Q38 · The structure of monosodium glutamate, a flavour enhancer, is shown

Q39 · The compound cholesterol has the following structure

Q40 · Ferulic acid is an antioxidant that occurs widely in plants

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