Cambridge A Level Chemistry 9701 — 2007 Oct/Nov Paper 1 · Variant 1

Question 1

1 Use of the Data Booklet is relevant to this question. When a sports medal with a total surface area of 150 cm2 was evenly coated with silver, using electrolysis, its mass increased by 0.216 g. How many atoms of silver were deposited per cm2 on the surface of the medal? A 8.0 × 1018 B 1.8 × 1019 C 1.2 × 1021 D 4.1 × 1022

Accepted Answer

A

Question 2

2 Use of the Data Booklet is relevant to this question. In forming ionic compounds, elements generally form an ion with the electronic structure of a noble gas. Which ion does not have a noble gas electronic structure? A I– B Rb+ C Sn2+ D Sr2+

Accepted Answer

C

Question 3

3 The first stage in the manufacture of nitric acid is the oxidation of ammonia by oxygen. wNH3(g) + xO2(g) → yNO(g) + zH2O(g) Which values for w, x, y and z are needed to balance the equation? w x y z A 4 5 4 6 B 4 6 4 5 C 5 6 5 4 D 6 5 6 4

Accepted Answer

A

Question 4

4 The graph shows the first thirteen ionisation energies for element X. ionisation energy number of electrons removed What can be deduced about element X from the graph? A It is in the second period (Li to Ne) of the Periodic Table. B It is a d-block element. C It is in Group II of the Periodic Table. D It is in Group III of the Periodic Table.

Accepted Answer

C

Question 5

5 Hydrogen bonding can occur between molecules of methanal, HCHO, and molecules of liquid Y. What could liquid Y be? A CH3OH B CH3CHO C CH3COCH3 D CH3CO2CH3

Accepted Answer

A

Question 6

6 Lycra is a polyurethane fibre used in the fashion industry. It is a polymer made from two monomers, one of which has the following formula. O=C=N–(CH2)n –N=C=O What is the O–C–N bond angle in this molecule? A 90 ° B 109 ° C 120 ° D 180 °

Accepted Answer

D

Question 7

7 What are the lattice structures of solid diamond, iodine and silicon(IV) oxide? giant molecular simple molecular A diamond, silicon(IV) oxide iodine B diamond, iodine silicon(IV) oxide C iodine diamond, silicon(IV) oxide D silicon(IV) oxide diamond, iodine

Accepted Answer

A

Question 8

8 Which equation represents the standard enthalpy change of atomisation of bromine? A Br2(l) → 2Br(g) B Br2(g) → 2Br(g) C 2 Br2(l) → Br(g) 1 D 2 Br2(g) → Br(g) 1

Accepted Answer

C

Question 9

9 In an experiment, 50.0 cm3 of a 0.10 mol dm–3 solution of a metallic salt reacted exactly with 25.0 cm3 of 0.10 mol dm–3 aqueous sodium sulphite. The half-equation for oxidation of sulphite ion is shown below. SO 3 (aq) + H2O(I) → SO 2 − 2 4 (aq) + 2H+(aq) + 2e– − If the original oxidation number of the metal in the salt was +3, what would be the new oxidation number of the metal? A +1 B +2 C +4 D +5

Accepted Answer

B

Question 10

10 Nitrogen dioxide decomposes on heating according to the following equation. 2NO2(g) 2NO(g) + O2(g) When 4 mol of nitrogen dioxide were put into a 1 dm3 container and heated to a constant temperature, the equilibrium mixture contained 0.8 mol of oxygen. What is the value of the equilibrium constant, Kc, at the temperature of the experiment? 0 . 8 2 × 0 . 8 1 . 6 × 0 . 8 1 . 6 2 × 0 . 8 1 . 6 2 × 0 . 8 A B C D 4 2 2 . 4 2 4 2 2 . 4 2

Accepted Answer

D

Question 11

11 It is often said that the rate of a typical reaction is roughly doubled by raising the temperature by 10 °C. What explains this observation? A Raising the temperature by 10 °C doubles the average kinetic energy of each molecule. B Raising the temperature by 10 °C doubles the average velocity of the molecules. C Raising the temperature by 10 °C doubles the number of molecular collisions in a given time. D Raising the temperature by 10 °C doubles the number of molecules having more than a certain minimum energy.

Accepted Answer

D

Question 12

12 When dangerous chemicals are transported by road, vehicles must carry signs that indicate what measures should be taken in the event of a spillage of the chemical carried. Which material must be used if there were a spillage of metallic sodium? A ethanol B jets of water C sand D water spray

Accepted Answer

C

Question 13

13 Which species has the largest radius? A P3 − B Cl − C Ar D K+

Accepted Answer

A

Question 14

14 Use of the Data Booklet is relevant to this question. The sketch graph shows the variation of one physical or chemical property with another for the Group II elements. y x What are the correct labels for the axes? x-axis y-axis A atomic number mass number B atomic number melting point C first ionisation energy atomic number D first ionisation energy atomic radius

Accepted Answer

A

Question 15

15 The chemical properties of an element at the top of a group in the Periodic Table are often different from those of the rest of the elements in the group. Of the following properties of beryllium and its compounds, which property is typical of the elements below it in Group II? A Be does not react with hot water. B BeCl2 is covalent. C Be(NO3)2 produces BeO on thermal decomposition. D BeO dissolves in alkalis.

Accepted Answer

C

Question 16

16 Compound X on refluxing with aqueous sodium hydroxide gave mixture Y which on distillation with acidified potassium dichromate(VI) produced propanone. Mixing Y with dilute nitric acid and aqueous silver nitrate gave a cream precipitate. What could compound X be? A CH3CHBrCH3 B CH3CHICH3 C CH3CH2CH2Br D CH3CH2CH2I

Accepted Answer

A

Question 17

17 There are three stages in the Contact process for the production of sulphuric acid. 1 S + O2 → SO2 2 SO2 + 1 2 O2 → SO3 3 SO3 + H2O → H2SO4 Which statement about this process is correct? A In the first stage a large excess of air under high pressure is used to improve the yield. B Two of the three stages are equilibria. C All three stages are exothermic. D In the final stage SO3 is absorbed by water droplets.

Accepted Answer

C

Question 18

18 Gaseous nitrogen is less reactive than gaseous fluorine. What is the reason for this difference in reactivity? A The boiling point of nitrogen is lower than that of fluorine. B The relative molecular mass of nitrogen is lower than that of fluorine. C The atomic radius of nitrogen is greater than that of fluorine. D The bond strength in the molecule is greater in nitrogen than in fluorine.

Accepted Answer

D

Question 19

19 Which molecules, each with a linear carbon chain, can have an optically active isomer? I II III IV C3H6BrI C3H4BrI C3H6I2 C3H4Br2 A I and II only B I, II and III only C II and III only D I, II and IV only

Accepted Answer

B

Question 20

20 In which pair do the isomers have identical boiling points? A CH3CH2CH2CH2OH    and    (CH3)2CHCH2OH B CH3(CH2)4CH3            and    (CH3)2CHCH(CH3)2 CH3 CH3 C H C and C H Cl CH2Cl Cl H  C Cl 2 CH3 H CH3 CH3 D C C and C C H CH3 H H

Accepted Answer

C

Question 21

21 Tetramethyl-lead(IV), (CH3)4Pb, increases the rate of the reaction of methane with chlorine. CH4(g) + Cl2(g) → CH3Cl(g) + HCl(g) Why can tetramethyl-lead(IV) behave in this way? A It is a source of methyl radicals. B It releases CH3 + (g) . C It reacts with chloromethane and prevents equilibrium being established. D Metal ions catalyse the reaction.

Accepted Answer

A

Question 22

22 Which reaction occurs when ethane and chlorine are mixed in diffused sunlight? A a free-radical substitution with hydrogen given off B a free-radical substitution with hydrogen chloride given off C a free-radical substitution with no gas given off D a nucleophilic substitution with hydrogen chloride given off

Accepted Answer

B

Question 23

23 Limonene is an oil formed in the peel of citrus fruits. CH3 CH2 C CH3 limonene Which product is formed when molecular bromine reacts with limonene at room temperature in the dark? A B C D Br Br CH3 CH2 CH3 CH2 C C CH3 C CH2Br CH3 C CH2Br Br Br Br CH3 CH3 Br CH3 CH3 Br

Accepted Answer

D

Question 24

24 The anaesthetic halothane, CF3CHBrCl, is made industrially as shown below. HF Br2 CCl2=CHCl CF3CH2Cl CF3CHBrCl stage 1 stage 2 Which type of reaction is occurring in stage 2? A electrophilic addition B electrophilic substitution C free radical substitution D nucleophilic addition

Accepted Answer

C

Question 25

25 Chlorofluoroalkanes, CFCs, can be used as refrigerants, aerosol propellants and fire extinguishers. CFCs such as CCl3F and CCl2F2 are more stable than chloroalkanes such as CCl4. What is the reason for their greater stability? A Fluorine has a higher first ionisation energy than chlorine. B Fluorine radicals are more stable than chlorine radicals. C The C–F bond energy is larger than the C–Cl bond energy. D The C–F bond is more polar than the C–Cl bond.

Accepted Answer

C

Question 26

26 Butanedioic acid occurs in amber, algae, lichens, sugar cane and beets. It may be synthesised in two steps from 1,2-dibromoethane. step 1 step 2 BrCH2CH2Br X HO2CCH2CH2CO2H Which reagents could be used for this synthesis? step 1 step 2 A HCN(g) HCl (aq) B HCO2Na(aq) HCl (aq) C KCN(aq/alcoholic) H2SO4(aq) D NaOH(aq) K2Cr2O7 / H2SO4(aq)

Accepted Answer

C

Question 27

27 Which reaction will distinguish between a primary and a secondary alcohol? A warming with H+ / MnO − 4 B warming with H+ / Cr2O 2 − 7 C dehydration, followed by reaction with Br2(aq) D oxidation, followed by reaction with Fehling’s (or Tollens’) reagent

Accepted Answer

D

Question 28

28 Hept-4-enal is present in cow’s milk. CH3CH2CH=CHCH2CH2CHO hept-4-enal What is formed when hept-4-enal is reduced with either hydrogen and a nickel catalyst or sodium borohydride? A with H2 / Ni CH3(CH2)5CH2OH B with H2 / Ni CH3(CH2)5CH3 C with NaBH4 CH3(CH2)5CH2OH D with NaBH4 CH3(CH2)5CHO

Accepted Answer

A

Question 29

29 Which of these reactions is shown by butanone, CH3COCH2CH3? A On warming with acidified potassium dichromate(VI) the solution turns green. B On heating with Fehling’s reagent a red precipitate is formed. C With 2,4-dinitrophenylhydrazine reagent an orange precipitate is formed. D With hydrogen cyanide an aldehyde is formed.

Accepted Answer

C

Question 30

30 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 CH4O B C2H4O C C2H4O2 D C3H7O2

Accepted Answer

B

Question 31

31 What are assumptions of the kinetic theory of gases and hence of the ideal gas equation, PV = nRT ? 1 Molecules move without interacting with one another except for collisions. 2 Intermolecular forces are negligible. 3 Intermolecular distances are much greater than the molecular size.

Accepted Answer

A

Question 32

32 Carbon monoxide burns readily in oxygen to form carbon dioxide. What can be deduced from this information? 1 The +4 oxidation state of carbon is more stable than the +2 state. 2 The standard enthalpy change of formation of carbon dioxide is more negative than that of carbon monoxide. 3 The value of the equilibrium constant for the reaction, 2CO(g) + O2(g) 2CO2(g), is likely to be high.

Accepted Answer

A

Question 33

33 Phosphorus pentachloride is introduced into an empty gas syringe which has a movable, tightly- fitting plunger. The gas is allowed to expand until equilibrium is reached at a temperature at which the phosphorus pentachloride partially dissociates. PCl5(g) PCl3(g) + Cl2(g) self-sealing cap for introducing gas plunger sample syringe oven Which statements are correct? 1 The equilibrium pressure inside the syringe will be greater than atmospheric pressure. 2 When the plunger is pushed in the equilibrium adjusts to produce more PCl5(g). 3 The volume of gas in the syringe at equilibrium will be greater than if no dissociation had occurred.

Accepted Answer

C

Question 34

34 Which statements are correct about the activation energy of a reaction? 1 It is different for the forward and back reactions in an exothermic process. 2 It is low for a reaction that takes place slowly. 3 It is unaffected by the presence of a catalyst.

Accepted Answer

D

Question 35

35 When a firework is lit a fuel and an oxidising agent react. In such a firework, magnesium is the fuel and barium nitrate is the oxidising agent. Which solid products are produced when the firework is lit? 1 BaO 2 MgO 3 Mg(NO3)2

Accepted Answer

B

Question 36

36 Why is the addition of concentrated sulphuric acid to solid potassium iodide unsuitable for the preparation of hydrogen iodide? 1 Hydrogen iodide is not displaced by sulphuric acid. 2 Iodide ions are oxidised to iodine. 3 The product is contaminated by sulphur compounds.

Accepted Answer

C

Question 37

37 Which mixtures, on heating, produce the gas ND3? [D = H 2 , an isotope of hydrogen] 1 1 CaO(s) and ND4Cl(s) 2 CH3CN and NaOD in D2O 3 NDH3Cl and NaOD in D2O

Accepted Answer

B

Question 38

38 Which structures show a primary alcohol that cannot be dehydrated to form an alkene? 1 CH3OH 2 CH3CH2OH 3 CH3CH(OH)CH3

Accepted Answer

D

Question 39

39 In the reaction between an aldehyde and HCN catalysed by NaCN, which statements about the reaction mechanism are true? 1 A new carbon-carbon bond is formed. 2 In the intermediate, the oxygen carries a negative charge. 3 The last stage involves the formation of a hydrogen-oxygen bond.

Accepted Answer

A

Question 40

40 Monopotassium citrate is used as an emulsifying agent in powdered milk and in powdered soups. It may be represented by the formula shown. CH2CO2H HO C CO2  K+ – CH2CO2H Which statements about monopotassium citrate are correct? 1 It can form optical isomers. 2 It can act as a dibasic acid. 3 It can form esters with both acids and alcohols.

Accepted Answer

C

Question paper16 pages

Mark scheme2 pages

Questions as text

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

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

Q3 · The first stage in the manufacture of nitric acid is the oxidation of ammonia by oxygen

Q4 · The graph shows the first thirteen ionisation energies for element X

Q5 · Hydrogen bonding can occur between molecules of methanal, HCHO, and molecules of liquid Y

Q6 · Lycra is a polyurethane fibre used in the fashion industry

Q7 · What are the lattice structures of solid diamond, iodine and silicon(IV) oxide?

Q8 · Which equation represents the standard enthalpy change of atomisation of bromine?

Q9 · In an experiment, 50.0 cm3 of a 0.10 mol dm–3 solution of a metallic salt reacted exactly…

Q10 · Nitrogen dioxide decomposes on heating according to the following equation

Q11 · It is often said that the rate of a typical reaction is roughly doubled by raising the…

Q12 · When dangerous chemicals are transported by road, vehicles must carry signs that indicate…

Q13 · Which species has the largest radius?

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

Q15 · The chemical properties of an element at the top of a group in the Periodic Table are…

Q16 · Compound X on refluxing with aqueous sodium hydroxide gave mixture Y which on…

Q17 · There are three stages in the Contact process for the production of sulphuric acid

Q18 · Gaseous nitrogen is less reactive than gaseous fluorine

Q19 · Which molecules, each with a linear carbon chain, can have an optically active isomer?

Q20 · In which pair do the isomers have identical boiling points?

Q21 · Tetramethyl-lead(IV), (CH3)4Pb, increases the rate of the reaction of methane with…

Q22 · Which reaction occurs when ethane and chlorine are mixed in diffused sunlight?

Q23 · Limonene is an oil formed in the peel of citrus fruits

Q24 · The anaesthetic halothane, CF3CHBrCl, is made industrially as shown below

Q25 · Chlorofluoroalkanes, CFCs, can be used as refrigerants, aerosol propellants and fire…

Q26 · Butanedioic acid occurs in amber, algae, lichens, sugar cane and beets

Q27 · Which reaction will distinguish between a primary and a secondary alcohol?

Q28 · Hept-4-enal is present in cow’s milk

Q29 · Which of these reactions is shown by butanone, CH3COCH2CH3?

Q30 · The ester CH3CH2CH2CO2CH3 is responsible for the aroma of apples

Q31 · What are assumptions of the kinetic theory of gases and hence of the ideal gas equation…

Q32 · Carbon monoxide burns readily in oxygen to form carbon dioxide

Q33 · Phosphorus pentachloride is introduced into an empty gas syringe which has a movable…

Q34 · Which statements are correct about the activation energy of a reaction?

Q35 · When a firework is lit a fuel and an oxidising agent react

Q36 · Why is the addition of concentrated sulphuric acid to solid potassium iodide unsuitable…

Q37 · Which mixtures, on heating, produce the gas ND3?

Q38 · Which structures show a primary alcohol that cannot be dehydrated to form an alkene?

Q39 · In the reaction between an aldehyde and HCN catalysed by NaCN, which statements about the…

Q40 · Monopotassium citrate is used as an emulsifying agent in powdered milk and in powdered…

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