Cambridge A Level Chemistry 9701 — 2010 Oct/Nov Paper 1 · Variant 1

Question 1

1 Every year millions of tonnes each of chlorine and sodium hydroxide are manufactured by the electrolysis of brine using a ‘diaphragm cell’. What is the purpose of the diaphragm in such a cell? A to prevent chlorine gas escaping into the factory B to prevent the build up of pressure in the electrolysis cell C to provide a large surface area of electrode D to stop the products of electrolysis from reacting together

Accepted Answer

D

Question 2

2 A simple ion X+ contains eight protons. What is the electronic configuration of X+? A 1s2 2s1 2p6 B 1s2 2s2 2p3 C 1s2 2s2 2p5 D 1s2 2s2 2p7

Accepted Answer

B

Question 3

3 Equations involving four enthalpy changes are shown. Na(g) → Na+(g) + e– ∆H = W Na(g) → Na2+(g) + 2e– ∆H = X Na(s) → Na(g) ∆H = Y Na(s) → Na2+(g) + 2e– ∆H = Z What is the second ionisation energy of sodium? A 2W B X – W C Y – W D Z – Y

Accepted Answer

B

Question 4

4 Sulfur dioxide, SO2, is added to wines to prevent oxidation of ethanol by air. To determine the amount of SO2, a sample of wine is titrated with iodine, I2. In this reaction, one mole of SO2 is oxidised by one mole of I2. What is the change in oxidation number of sulfur in this reaction? A +2 to +4 B +2 to +6 C +4 to +5 D +4 to +6

Accepted Answer

D

Question 5

5 Use of the Data Booklet is relevant to this question. Nickel makes up 20 % of the total mass of a coin. The coin has a mass of 10.0 g. How many nickel atoms are in the coin? A 2.05 × 1022 B 4.30 × 1022 C 1.03 × 1023 D 1.20 × 1024

Accepted Answer

A

Question 6

6 Which ion has more electrons than protons and more protons than neutrons? [H = 1 1H ; D = 2 1 H ; O = 16 8 O] A D– B H3O+ C OD– D OH–

Accepted Answer

D

Question 7

7 Organic nitrates in photochemical smog can cause breathing difficulties. The diagram shows an example of an organic nitrate molecule. H 1 3 H C C O O NO2 2 H O What is the correct order of the bond angles shown in ascending order (smallest first)? A 1 → 2 → 3 B 2 → 1 → 3 C 3 → 1 → 2 D 3 → 2 → 1

Accepted Answer

C

Question 8

8 Enthalpy changes of combustion can be used to determine enthalpy changes of formation. The following equation represents the enthalpy change of formation of butane. 4C(s) + 5H2(g) → C4H10(g) By using the following standard enthalpy of combustion data, what is the value of the standard enthalpy change of formation,        , for this reaction? compound o carbon –394 hydrogen –286 butane –2877 A –5883 kJ mol–1 B –129 kJ mol–1 C +129 kJ mol–1 D +2197 kJ mol–1

Accepted Answer

B

Question 9

9 In a calorimetric experiment 1.60 g of a fuel is burnt. 45 % of the energy released is absorbed by 200 g of water whose temperature rises from 18 °C to 66 °C. The specific heat capacity of water is 4.2 J g–1 K–1. What is the total energy released per gram of fuel burnt? A 25 200 J B 56 000 J C 89 600 J D 143 360 J

Accepted Answer

B

Question 10

10 The value of the equilibrium constant, Kc, for the reaction to form ethyl ethanoate from ethanol and ethanoic acid is 4.0 at 60 °C. C2H5OH + CH3CO2H CH3CO2C2H5 + H2O When 1.0 mol of ethanol and 1.0 mol of ethanoic acid are allowed to reach equilibrium at 60 °C, what is the number of moles of ethyl ethanoate formed? A 1 B 2 C 1 D 3 3 3 4 4

Accepted Answer

B

Question 11

11 Which equation represents the change corresponding to the enthalpy change of atomisation of iodine? A 1 I2(g) → I(g) 2 B I2(g) → 2I(g) C 1 I2(s) → I(g) 2 D I2(s) → 2I(g)

Accepted Answer

C

Question 12

12 Camphor is a white solid which was used to make the early plastic celluloid. Camphor contains the same percentage by mass of hydrogen and oxygen. What is the molecular formula of camphor? A C10H6O6 B C10H8O C C10H16O D C10H10O2

Accepted Answer

C

Question 13

13 Why is the first ionisation energy of phosphorus greater than the first ionisation energy of silicon? A A phosphorus atom has one more proton in its nucleus. B The atomic radius of a phosphorus atom is greater. C The outer electron in a phosphorus atom is more shielded. D The outer electron in a phosphorus atom is paired.

Accepted Answer

A

Question 14

14 When magnesium nitrate, Mg(NO3)2.7H2O, is heated, which three gases are given off? A dinitrogen oxide, oxygen, water vapour B hydrogen, nitrogen, oxygen C hydrogen, nitrogen dioxide, oxygen D nitrogen dioxide, oxygen, water vapour

Accepted Answer

D

Question 15

15 Ammonium sulfate in nitrogenous fertilisers in the soil can be slowly oxidised by air producing sulfuric acid, nitric acid and water. How many moles of oxygen gas are needed to oxidise completely one mole of ammonium sulfate? A 1 B 2 C 3 D 4

Accepted Answer

D

Question 16

16 Chile saltpetre, NaNO3, contains sodium iodide as an impurity. Aqueous silver nitrate is added to an aqueous solution of Chile saltpetre. Concentrated aqueous ammonia is then added. Which observations are made? with acidified silver with concentrated nitrate aqueous ammonia A no precipitate no further reaction B no precipitate precipitate forms C precipitate forms precipitate dissolves D precipitate forms precipitate remains

Accepted Answer

D

Question 17

17 Which statement describes the halogens chlorine, bromine and iodine? A Their bond energies decrease with increasing proton number. B Their first ionisation energies increase with increasing proton number. C They are all coloured gases at room temperature. D They are all good reducing agents.

Accepted Answer

A

Question 18

18 Sulfur dioxide is used to bleach wood pulp in the production of paper. It is also used as an additive in the production of jam and marmalade, often in the form of sulfite compounds. When it is present in quantities greater than 10 mg / kg it is required to be listed as an ingredient of the jam. Why is sulfur dioxide added to jam? A It is a bleaching agent and removes the undesirable colours from the fruit used in the jam. B It is a preservative that destroys unwanted bacteria and enzymes. C It is a reducing agent and removes the acids that give the jam a sharp taste. D It is an acidic gas and maintains the pH of the jam at a suitable value to give it a sharp taste.

Accepted Answer

B

Question 19

19  Which property of beryllium and its compounds 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 20

20 One of the characteristics of addition polymerisation is that the empirical formulae of the polymer and of its monomer are the same. The absorbent material in babies’ disposable nappies is made from the addition polymer shown. CH2 CH2 CH2 CH CH CH CO2H CO2H CO2H From which monomer could this addition polymer be obtained? A CH3CH(OH)CO2H B HOCH2CH2CO2H C H2C=CHCO2H D HO2CCH=CHCO2H

Accepted Answer

C

Question 21

21 Compound X reacts with ethanoic acid in the presence of an H+ catalyst to produce the compound below. O H H O H3C C C C O C CH3 H H What is the molecular formula of compound X? A C2H6O2 B C2H6O3 C C4H8O D C4H8O2

Accepted Answer

D

Question 22

22 A compound Y has all of the properties below. • It is a liquid at 25 °C. • It mixes completely with water. • It reacts with aqueous sodium hydroxide. What could Y be? A ethanoic acid B ethanol C ethene D ethyl ethanoate

Accepted Answer

A

Question 23

23 Tartaric acid is present in some wines. It may be synthesised in the laboratory in two steps. step 1 step 2 OHCCHO intermediate HO2CCH(OH)CH(OH)CO2H tartaric acid Which reagents could be used for this synthesis? step 1 step 2 A HCl (aq) HCN(g) B HCN, NaCN(aq/alcoholic) H2SO4(aq) C H2SO4(aq) K2Cr2O7 / H2SO4(aq) D KCN(aq/alcoholic) K2Cr2O7 / H2SO4(aq)

Accepted Answer

B

Question 24

24 Which alcohol gives only one possible oxidation product when warmed with dilute acidified potassium dichromate(VI)? A butan-1-ol B butan-2-ol C 2-methylpropan-1-ol D 2-methylpropan-2-ol

Accepted Answer

B

Question 25

25 Limonene is an oil formed in the peel of citrus fruits. CH3 CH2 C CH3 limonene Which product is formed when an excess of bromine, Br2(l), 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 26

26 Lactic acid occurs naturally, for example in sour milk. H H O O H C C C H H O H lactic acid What is a property of lactic acid? A It decolourises aqueous bromine rapidly. B It is insoluble in water. C It reduces Fehling’s reagent. D Two molecules react with each other in the presence of a strong acid.

Accepted Answer

D

Question 27

27 Which compound would undergo nucleophilic addition? A bromoethane, C2H5Br B ethanal, CH3CHO C ethane, C2H6 D ethene, C2H4

Accepted Answer

B

Question 28

28 Which compound undergoes an SN1 substitution reaction? A CH3CH2CH2Br B (CH3)3CCH2I CH3    Cl C D CH2=CHCl

Accepted Answer

C

Question 29

29 The compound 2-methylpropene, C4H8, is a monomer used in the production of synthetic rubber. H CH3 C C H CH3 In addition to 2-methylpropene there are x other isomers of C4H8, structural or otherwise, which contain a double bond. What is the value of x? A 1 B 2 C 3 D 4

Accepted Answer

C

Question 30

30 Which environmental problem is not made worse by the release of oxides of nitrogen from car engines? A acidification of lakes B corrosion of buildings C photochemical smog D the hole in the ozone layer

Accepted Answer

D

Question 31

31 Ethanol is manufactured by reacting ethene gas and steam in the presence of phosphoric(V) acid. C2H4(g) + H2O(g) C2H5OH(g) ∆H = –45 kJ mol–1 The reaction is carried out at 570 K and 60 atm. What would be the consequences of carrying out the reaction at the same temperature but at a pressure of 200 atm? 1 The manufacturing costs would increase. 2 The maximum yield at equilibrium would be higher. 3 The reaction would proceed at a faster rate.

Accepted Answer

A

Question 32

32 The diagram represents the Boltzmann distribution of molecular energies at a given temperature. proportion of molecules energy Which of the factors that affect the rate of a reaction can be explained using such a Boltzmann distribution? 1 increasing the concentration of reactants 2 increasing the temperature 3 the addition of a catalyst

Accepted Answer

C

Question 33

33 Which types of intermolecular forces can exist between adjacent urea molecules? O C H2N NH2 urea 1 hydrogen bonding 2 permanent dipole-dipole forces 3 temporary induced dipole-dipole forces

Accepted Answer

A

Question 34

34 Samples of calcium and barium are separately added to beakers of cold water containing a few drops of litmus solution. Which observations will be made with only the calcium and not with the barium? 1 A white suspension appears in the water. 2 The solution turns blue. 3 A gas is evolved.

Accepted Answer

D

Question 35

35 Disproportionation is the term used to describe a reaction in which a reactant is simultaneously both oxidised and reduced. To which incomplete equations does the term disproportionation apply? 1 Cl2(g) + 2OH–(aq) → H2O(l) + Cl –(aq) + …… 2 3Cl2(g) + 6OH–(aq) → 3H2O(l) + ClO3 –(aq) + …… 3 2NO2(g) + H2O(l) → HNO3(aq) + ……

Accepted Answer

A

Question 36

36 Element X is a solid. It occurs as a contaminant of carbonaceous fuels. Its oxide Y is formed in car engines. Further oxidation of Y to Z can occur in the atmosphere. Which statements about Y and Z are correct? 1 Molecule Y has lone pairs of electrons. 2 The atmospheric oxidation of Y to Z is a catalysed reaction. 3 Y is a colourless gas.

Accepted Answer

A

Question 37

37 The diagram shows the structure of the naturally-occurring molecule cholesterol. H3C CH3 H CH3 H H H HO cholesterol Which statements about cholesterol are correct? 1 The molecule contains a secondary alcohol group. 2 The molecule contains two π bonds. 3 All carbon atoms in the four rings lie in the same plane.

Accepted Answer

D

Question 38

38 Glyceraldehyde, HOCH2CH(OH)CHO, is formed during photosynthesis, and contains a chiral carbon atom. Which reagents will react with glyceraldehyde to produce an organic product without a chiral carbon atom? 1 warmed acidified K2Cr2O7 2 NaBH4 3 Tollens’ reagent

Accepted Answer

B

Question 39

39 An organic compound decolourises aqueous bromine and reacts with sodium to produce hydrogen. Which molecular formula could represent this compound? 1 C3H6O 2 C3H4O2 3 C3H8O

Accepted Answer

B

Question 40

40 Textiles for use in aircraft are treated with a finish containing a halogenoalkane. What is the reason for this? 1 The textile burns less easily, improving safety. 2 The fabric forms hydrogen bonds to water more readily, making the fabric easier to wash. 3 The halogenoalkane undergoes addition polymerisation, stiffening the fabric.

Accepted Answer

D

Question paper16 pages

Mark scheme2 pages

Questions as text

Q1 · Every year millions of tonnes each of chlorine and sodium hydroxide are manufactured by…

Q2 · A simple ion X+ contains eight protons

Q3 · Equations involving four enthalpy changes are shown

Q4 · Sulfur dioxide, SO2, is added to wines to prevent oxidation of ethanol by air

Q5 · Use of the Data Booklet is relevant to this question

Q6 · Which ion has more electrons than protons and more protons than neutrons?

Q7 · Organic nitrates in photochemical smog can cause breathing difficulties

Q8 · Enthalpy changes of combustion can be used to determine enthalpy changes of formation

Q9 · In a calorimetric experiment 1.60 g of a fuel is burnt

Q10 · The value of the equilibrium constant, Kc, for the reaction to form ethyl ethanoate from…

Q11 · Which equation represents the change corresponding to the enthalpy change of atomisation…

Q12 · Camphor is a white solid which was used to make the early plastic celluloid

Q13 · Why is the first ionisation energy of phosphorus greater than the first ionisation energy…

Q14 · When magnesium nitrate, Mg(NO3)2.7H2O, is heated, which three gases are given off?

Q15 · Ammonium sulfate in nitrogenous fertilisers in the soil can be slowly oxidised by air…

Q16 · Chile saltpetre, NaNO3, contains sodium iodide as an impurity

Q17 · Which statement describes the halogens chlorine, bromine and iodine?

Q18 · Sulfur dioxide is used to bleach wood pulp in the production of paper

Q19 · Which property of beryllium and its compounds is typical of the elements below it in…

Q20 · One of the characteristics of addition polymerisation is that the empirical formulae of…

Q21 · Compound X reacts with ethanoic acid in the presence of an H+ catalyst to produce the…

Q22 · A compound Y has all of the properties below

Q23 · Tartaric acid is present in some wines

Q24 · Which alcohol gives only one possible oxidation product when warmed with dilute acidified…

Q25 · Limonene is an oil formed in the peel of citrus fruits

Q26 · Lactic acid occurs naturally, for example in sour milk

Q27 · Which compound would undergo nucleophilic addition?

Q28 · Which compound undergoes an SN1 substitution reaction?

Q29 · The compound 2-methylpropene, C4H8, is a monomer used in the production of synthetic…

Q30 · Which environmental problem is not made worse by the release of oxides of nitrogen from…

Q31 · Ethanol is manufactured by reacting ethene gas and steam in the presence of phosphoric(V)…

Q32 · The diagram represents the Boltzmann distribution of molecular energies at a given…

Q33 · Which types of intermolecular forces can exist between adjacent urea molecules?

Q34 · Samples of calcium and barium are separately added to beakers of cold water containing a…

Q35 · Disproportionation is the term used to describe a reaction in which a reactant is…

Q36 · Element X is a solid

Q37 · The diagram shows the structure of the naturally-occurring molecule cholesterol

Q38 · Glyceraldehyde, HOCH2CH(OH)CHO, is formed during photosynthesis, and contains a chiral…

Q39 · An organic compound decolourises aqueous bromine and reacts with sodium to produce…

Q40 · Textiles for use in aircraft are treated with a finish containing a halogenoalkane

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