Cambridge A Level Chemistry 9701 — 2008 Oct/Nov Paper 1 · Variant 1

Question 1

1 Use of the Data Booklet is relevant to this question. Titanium(IV) oxide, TiO2, is brilliantly white and much of the oxide produced is used in the manufacture of paint. What is the maximum amount of TiO2 obtainable from 19.0 tonnes of the ore ilmenite, FeTiO3? A 10.0 tonnes B 12.7 tonnes C 14.0 tonnes D 17.7 tonnes

Accepted Answer

A

Question 2

2 Carbon disulphide vapour burns in oxygen according to the following equation. CS2(g) + 3O2(g) → CO2(g) + 2SO2(g) A sample of 10 cm3 of carbon disulphide was burned in 50 cm3 of oxygen. After measuring the volume of gas remaining, the product was treated with an excess of aqueous sodium hydroxide and the volume of gas measured again. All measurements were made at the same temperature and pressure, under such conditions that carbon disulphide was gaseous. What were the measured volumes? volume of gas volume of gas after after burning / cm3 adding NaOH(aq) / cm3 A 30 0 B 30 20 C 50 20 D 50 40

Accepted Answer

C

Question 3

3 In which pair do both atoms have one electron only in an s orbital in their ground states? A Ca, Sc B Cu, Be C H, He D Li, Cr

Accepted Answer

D

Question 4

4 Use of the Data Booklet is relevant to this question. Hard water contains calcium ions and hydrogencarbonate ions arising from dissolved calcium hydrogencarbonate, Ca(HCO3)2. How many electrons are present in the hydrogencarbonate anion? A 30 B 31 C 32 D 33

Accepted Answer

C

Question 5

5 Which quantity would best indicate the relative strengths of the hydrogen bonds between the molecules in liquid hydrogen halides? A bond dissociation energies B enthalpy changes of solution C enthalpy changes of formation D enthalpy changes of vaporisation

Accepted Answer

D

Question 6

6 A substance commonly found in the house or garden has the following properties. • It is combustible. • It is an electrical insulator. • It melts over a range of temperature. What could the substance be? A brass B paper C poly(ethene) D silicon(IV) oxide

Accepted Answer

C

Question 7

7 Which of the following would behave most like an ideal gas at room temperature? A carbon dioxide B helium C hydrogen D nitrogen

Accepted Answer

B

Question 8

8 Red lead oxide, Pb3O4, is used in metal priming paints. It can be made by heating PbO in air. 6PbO(s) + O2(g) → 2Pb3O4(s) Which two values are needed to calculate the enthalpy change for this reaction? A enthalpy change of combustion of lead and enthalpy change of formation of Pb3O4 B enthalpy change of combustion of PbO and enthalpy change of formation of Pb3O4 C enthalpy change of formation of PbO and enthalpy change of atomisation of O2 D enthalpy change of formation of PbO and enthalpy change of formation of Pb3O4

Accepted Answer

D

Question 9

9 The diagram represents the reaction pathway for the following reaction. W(g) + X(g) → Y(g) + Z(g) energy W + X Y + Z reaction pathway What statement can be made about the reverse reaction, Y(g) + Z(g) → W(g) + X(g)? A It will have a larger activation energy and a positive ∆H. B It will have a larger activation energy and a negative ∆H. C It will have a smaller activation energy and a positive ∆H. D It will have a smaller activation energy and a negative ∆H.

Accepted Answer

A

Question 10

10 For the equilibrium 2SO2(g) + O2(g) 2SO3(g), what will change the value of Kp? A adding a catalyst B adding more O2 C increasing the pressure D increasing the temperature

Accepted Answer

D

Question 11

11 Dinitrogen tetroxide dissociates into nitrogen dioxide on heating. N2O4(g) 2NO2(g) In an experiment the partial pressures of the gases at equilibrium were found to be NO2, 0.33 atm; N2O4, 0.67 atm. What is the numerical value of Kp at the temperature of the experiment? A 0.16 B 0.49 C 0.65 D 2.03

Accepted Answer

A

Question 12

12 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 When Pd2+(aq) is used, the reaction proceeds by a different route.

Accepted Answer

B

Question 13

13 Which oxide, when mixed with water, will produce the most acidic solution? A CO B CO2 C SiO2 D P2O5

Accepted Answer

D

Question 14

14 Which salt is produced by adding aqueous ammonia to aqueous sulphur dioxide until just alkaline? A NH4SO3 B NH4SO4 C (NH4)2SO3 D (NH4)2SO4

Accepted Answer

C

Question 15

15 Aluminium chloride catalyses certain reactions by forming carbocations (carbonium ions) with chloroalkanes as shown. RCl + Al Cl3 → R+ + A l C l − 4 Which property makes this reaction possible? A AlCl3 exists as the dimer Al2Cl6 in the vapour. B AlCl3 is a covalent molecule. C The aluminium atom in Al Cl3 has an incomplete octet of electrons. D The chlorine atom in RCl has a vacant p orbital.

Accepted Answer

C

Question 16

16 Due to their similar ionic radii, the reactions of lithium and magnesium and their corresponding compounds are very similar. Which statement concerning the reactions of lithium and its compounds is correct? A Lithium carbonate decomposes on heating at a relatively low temperature, forming lithium oxide and carbon dioxide. B Lithium nitrate decomposes on heating, forming lithium nitrite and oxygen. C Lithium burns only slowly in oxygen. D Lithium reacts violently with cold water, liberating hydrogen.

Accepted Answer

A

Question 17

17 A student observed the reactions when sodium chloride and sodium iodide were each reacted separately with concentrated sulphuric acid and concentrated phosphoric acid. The observations are recorded in the table. sodium chloride sodium iodide conc. H2SO4 colourless acidic gas purple vapour formed formed conc. H3PO4 colourless acidic gas colourless acidic gas formed formed Which deduction can be made from these observations? A Concentrated phosphoric acid is a stronger oxidising agent than concentrated sulphuric acid. B Concentrated phosphoric acid is a stronger oxidising agent than iodine. C Concentrated sulphuric acid is a stronger oxidising agent than chlorine. D Concentrated sulphuric acid is a stronger oxidising agent than iodine.

Accepted Answer

D

Question 18

18 When gaseous chemicals are transported by road or by rail they are classified as follows. flammable non-flammable poisonous Which gas is poisonous? A butane B carbon dioxide C hydrogen D sulphur dioxide

Accepted Answer

D

Question 19

19 Which statement explains the observation that magnesium hydroxide dissolves in aqueous ammonium chloride, but not in aqueous sodium chloride? A The ionic radius of the NH  ion is similar to that of Mg2+ but not that of Na+. + 4 B NH4Cl dissociates less fully than NaCl. C The Na+ and Mg2+ ions are isoelectronic (have the same number of electrons). D The NH  ion acts as an acid. + 4

Accepted Answer

D

Question 20

20 Sorbitol is a naturally-occurring compound with a sweet taste. It is often used as a substitute for sucrose by the food industry. The diagram shows its structure. H H C O H H C O H H O C H H C O H H C O H H C O H H How many chiral centres are present in sorbitol? A 1 B 2 C 3 D 4

Accepted Answer

D

Question 21

21 The compound ‘leaf alcohol’ is partly responsible for the smell of new-mown grass. CH3CH2CH=CHCH2CH2OH leaf alcohol Which two compounds will be formed when ‘leaf alcohol’ is oxidised using hot, concentrated manganate(VII) ions? A CH3CO2H and HOCH2CH2CH2CO2H B CH3CO2H and HO2CCH2CH2CO2H C CH3CH2CO2H and HO2CCH2CO2H D CH3CH2CO2H and HOCH2CH2CO2H

Accepted Answer

C

Question 22

22 Which hydrocarbon can form a monochloro-substitution derivative which shows both chirality and cis-trans isomerism? A CH3CH=CH2 B (CH3)2C=CH2 C CH3CH=C(CH3)2 D CH3CH=CHCH2CH3

Accepted Answer

D

Question 23

23 Four drops of 1-chlorobutane, 1-bromobutane and 1-iodobutane were put separately into three test-tubes containing 1.0 cm3 of aqueous silver nitrate at 60 °C. A hydrolysis reaction occurred. (R represents the butane chain C4H9– and X the halogen atom.) H2O(l) + R–X(l)  + Ag+(aq) → R–OH(aq) + AgX(s) + H+(aq) The rate of formation of cloudiness in the tubes was in the order RCl < RBr < RI. Why is this? A The R–X bond polarity decreases from RCl to RI. B The solubility of AgX(s) decreases from AgCl to AgI. C The ionisation energy of the halogen decreases from Cl to I. D The bond energy of R–X decreases from RCl to RI.

Accepted Answer

D

Question 24

24 A possible mechanism of the exothermic hydrolysis of 2-chloro-2-methylpropane is shown. CH3 CH3 slow + _ CH3 C Cl CH3 C + Cl CH3 CH3 CH3 CH3 + _ fast CH3 C + OH CH3 C OH CH3 CH3 Which diagram represents the reaction profile for this mechanism? A B C D energy energy energy energy reaction pathway reaction pathway reaction pathway reaction pathway

Accepted Answer

C

Question 25

25 The functional group in a primary alcohol is –CH2OH. Which reagent reacts with a primary alcohol, under suitable conditions, to give an organic product with the same number of oxygen atoms as the alcohol? A Al2O3 B CH3CO2H C HBr D Na

Accepted Answer

D

Question 26

26 Ethyl phenylethanoate, C6H5CH2CO2C2H5, gives a characteristic flowery aroma to honey. Which sequence of reagents, with heating in each case, leads to the preparation of C6H5CH2CO2C2H5 from C6H5CH2Br? NaOH(aq) C2H5COCl A C6H5CH2Br NaOH(aq) C2H5CO2H, conc. H2SO4 B C6H5CH2Br NaCN(alcoholic) H+(aq) C2H5OH, conc. H2SO4 C C6H5CH2Br NaOH(aq) conc. MnO4, H+(aq) – C2H5OH, conc. H2SO4 D C6H5CH2Br

Accepted Answer

C

Question 27

27 The stomach wall can become sensitive to acidic compounds. Which is the most acidic compound? A B C D CO2H CO2H CO2H CH3CH(OH)CO2H OCOCH3 CH(OH) CH(OH) lactic acid CH(OH) CH2 aspirin CO2H CH(OH) CH(OH) malic acid CH2OH gluconic acid

Accepted Answer

C

Question 28

28 Bees use 2-methylbutyl ethanoate as an ‘alarm’ pheromone. When disturbed, individual bees on guard will raise their abdomen and emit the alarm pheromone, fanning their wings to aid its dispersal. This alerts other bees to a danger and makes them ready to sting when required. H O H H H H H C C O C C C C H H H H H H C H H 2-methylbutyl ethanoate Which starting materials would be required to synthesise 2-methylbutyl ethanoate? A CH3CH2OH and CH3CH2CH(CH3)CO2H B CH3CO2H and CH3CH2CH(CH3)CH2OH C CH3CH2OH and CH3CH2CH(CH3)CH2CO2H D CH3CO2H and CH3CH2CH(CH3)CH2CO2H

Accepted Answer

B

Question 29

29 The product of the reaction between propanone and hydrogen cyanide is hydrolysed under acidic conditions. What is the formula of the final product? A CH3CH(OH)CO2H B CH3CH2CH2CO2H C (CH3)2CHCONH2 D (CH3)2C(OH)CO2H

Accepted Answer

D

Question 30

30 Use of the Data Booklet is relevant to this question. Ethyl ethanoate can be obtained from ethanoic acid and ethanol by the following reaction. CH3CH2OH + CH3CO2H CH3CO2CH2CH3 + H2O Ethanol (30 g) and ethanoic acid (30 g) are heated under reflux together, and 22 g of ethyl ethanoate are obtained. What is the yield of the ester? A 25 % B 38 % C 50 % D 77 %

Accepted Answer

C

Question 31

31 Kevlar has the structure below. O O O O C C N N C C N N H H H H Compared to a steel rope of similar dimensions, a Kevlar rope is both lighter and stronger. Which properties of Kevlar help to explain these facts? 1 The fibres of Kevlar align due to hydrogen bonding. 2 The mass per unit length is less in a Kevlar rope than in a steel rope. 3 The Kevlar molecule has no permanent dipole.

Accepted Answer

B

Question 32

32 Which of the following can act as a Bronsted-Lowry acid? 1 H3O+ 2 NH + 4 3 H2O

Accepted Answer

A

Question 33

33 Under given conditions, what governs the rate of a forward reaction? 1 the activation energy of the reaction 2 the enthalpy change of the reaction 3 the equilibrium constant of the reaction

Accepted Answer

D

Question 34

34 Which statements concerning the Group II elements magnesium, calcium and barium are correct? 1 Their reactivity increases with increasing relative atomic mass. 2 The oxidation number exhibited in their stable compounds is +2. 3 On strong heating, their nitrates give off oxygen only.

Accepted Answer

B

Question 35

35 Chlorine is a greenish-yellow gas, bromine is a dark red liquid and iodine is a dark grey solid. What causes these differences in volatility? 1 the halogen-halogen bond energy 2 the magnitude of the van der Waals’ forces between the molecules 3 the number of electrons in the halogen molecule

Accepted Answer

C

Question 36

36 Which statements about the Haber process for the industrial production of ammonia are correct? 1 The equilibrium constant Kp increases with pressure. 2 As the temperature increases, the equilibrium constant for the forward reaction becomes smaller. 3 The process is usually carried out at between 450 °C and 550 °C at a pressure of at least 150 atm.

Accepted Answer

C

Question 37

37 Which statements about alkenes are correct? 1 They are formed when higher alkanes are cracked. 2 They are used as monomers for polymerisation. 3 They are less reactive than alkanes towards electrophiles.

Accepted Answer

B

Question 38

38 Which of the following would be suitable for use in a fire extinguisher? 1 CBrF3 2 CH3(CH2)5CH2Br 3 HCl

Accepted Answer

D

Question 39

39 During the bromination of methane, the free radical CH  is generated and a possible terminating • 3 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 CH3 2 CH3CHCHCH3 CH3 3 CH3CH2CHCH2CH3

Accepted Answer

B

Question 40

40 The structure of the antioxidant vitamin C is shown in the diagram. HO OH C C O C CHCH(OH)CH2OH O On the basis of this structure, which properties is vitamin C likely to have? 1 It is soluble in water. 2 It decolourises aqueous bromine rapidly. 3 It reduces Fehling’s reagent.

Accepted Answer

B

Question paper16 pages

Mark scheme2 pages

Questions as text

Q1 · Use of the Data Booklet is relevant to this question

Q2 · Carbon disulphide vapour burns in oxygen according to the following equation

Q3 · In which pair do both atoms have one electron only in an s orbital in their ground states?

Q4 · Use of the Data Booklet is relevant to this question

Q5 · Which quantity would best indicate the relative strengths of the hydrogen bonds between…

Q6 · A substance commonly found in the house or garden has the following properties

Q7 · Which of the following would behave most like an ideal gas at room temperature?

Q8 · Red lead oxide, Pb3O4, is used in metal priming paints

Q9 · The diagram represents the reaction pathway for the following reaction

Q10 · For the equilibrium 2SO2(g) + O2(g) 2SO3(g), what will change the value of Kp?

Q11 · Dinitrogen tetroxide dissociates into nitrogen dioxide on heating

Q12 · Crotonaldehyde, CH3CH=CHCHO, can be obtained by oxidising butadiene, CH2=CHCH=CH2, using…

Q13 · Which oxide, when mixed with water, will produce the most acidic solution?

Q14 · Which salt is produced by adding aqueous ammonia to aqueous sulphur dioxide until just…

Q15 · Aluminium chloride catalyses certain reactions by forming carbocations (carbonium ions)…

Q16 · Due to their similar ionic radii, the reactions of lithium and magnesium and their…

Q17 · A student observed the reactions when sodium chloride and sodium iodide were each reacted…

Q18 · When gaseous chemicals are transported by road or by rail they are classified as follows

Q19 · Which statement explains the observation that magnesium hydroxide dissolves in aqueous…

Q20 · Sorbitol is a naturally-occurring compound with a sweet taste

Q21 · The compound ‘leaf alcohol’ is partly responsible for the smell of new-mown grass

Q22 · Which hydrocarbon can form a monochloro-substitution derivative which shows both…

Q23 · Four drops of 1-chlorobutane, 1-bromobutane and 1-iodobutane were put separately into…

Q24 · A possible mechanism of the exothermic hydrolysis of 2-chloro-2-methylpropane is shown

Q25 · The functional group in a primary alcohol is –CH2OH

Q26 · Ethyl phenylethanoate, C6H5CH2CO2C2H5, gives a characteristic flowery aroma to honey

Q27 · The stomach wall can become sensitive to acidic compounds

Q28 · Bees use 2-methylbutyl ethanoate as an ‘alarm’ pheromone

Q29 · The product of the reaction between propanone and hydrogen cyanide is hydrolysed under…

Q30 · Use of the Data Booklet is relevant to this question

Q31 · Kevlar has the structure below

Q32 · Which of the following can act as a Bronsted-Lowry acid?

Q33 · Under given conditions, what governs the rate of a forward reaction?

Q34 · Which statements concerning the Group II elements magnesium, calcium and barium are…

Q35 · Chlorine is a greenish-yellow gas, bromine is a dark red liquid and iodine is a dark grey…

Q36 · Which statements about the Haber process for the industrial production of ammonia are…

Q37 · Which statements about alkenes are correct?

Q38 · Which of the following would be suitable for use in a fire extinguisher?

Q39 · During the bromination of methane, the free radical CH is generated and a possible…

Q40 · The structure of the antioxidant vitamin C is shown in the diagram

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