Cambridge A Level Chemistry 9701 — 2010 May/June Paper 1 · Variant 2

Question 1

1 Which gas closely approaches ideal behaviour at room temperature and pressure? A ammonia B carbon dioxide C helium D oxygen

Accepted Answer

C

Question 2

2 Use of the Data Booklet is relevant to this question. What could be the proton number of an element that has three unpaired electrons in each of its atoms? A 5 B 13 C 15 D 21

Accepted Answer

C

Question 3

3 Use of the Data Booklet is relevant to this question. The elements radon (Rn), francium (Fr) and radium (Ra) have consecutive proton numbers in the Periodic Table. What is the order of their first ionisation energies? least most endothermic endothermic A Fr Ra Rn B Fr Rn Ra C Ra Fr Rn D Rn Ra Fr

Accepted Answer

A

Question 4

4 Some bond energy values are listed below. bond bond energy / kJ mol–1 C–H 410 C–Cl 340 Cl–Cl 244 Br–Br 193 These bond energy values relate to the following four reactions. P Br2 → 2Br Q 2Cl → Cl2 R CH3 + Cl → CH3Cl S CH4 → CH3 + H What is the order of enthalpy changes of these reactions from most negative to most positive? A P → Q → R → S B Q → R → S → P C R → Q → P → S D S → P → Q → R

Accepted Answer

C

Question 5

5 Given the following enthalpy changes, I2(g) + 3Cl2(g) → 2ICl3(s) ∆Ho = –214 kJ mol–1 I2(s) → I2(g) ∆Ho = +38 kJ mol–1 What is the standard enthalpy change of formation of iodine trichloride, ICl3(s)? A +176 kJ mol–1 B –88 kJ mol–1 C –176 kJ mol–1 D –214 kJ mol–1

Accepted Answer

B

Question 6

6 Ammonium nitrate, NH4NO3, can decompose explosively when heated. NH4NO3 → N2O + 2H2O What are the changes in the oxidation numbers of the two nitrogen atoms in NH4NO3 when this reaction proceeds? A –2, –4 B +2, +6 C +4, –6 D +4, –4

Accepted Answer

D

Question 7

7 Which mass of gas would occupy a volume of 3 dm3 at 25 °C and 1 atmosphere pressure? [1 mol of gas occupies 24 dm3 at 25 °C and 1 atmosphere pressure.] A 3.2 g O2 gas B 5.6 g N2 gas C 8.0 g SO2 gas D 11.0 g CO2 gas

Accepted Answer

C

Question 8

8 Use of the Data Booklet is relevant to this question. 2.920 g of a Group II metal, X, reacts with an excess of chlorine to form 5.287 g of a compound with formula XCl2. What is metal X? A barium B calcium C magnesium D strontium

Accepted Answer

D

Question 9

9 The table gives the concentrations and pH values of the aqueous solutions of two compounds, X and Y. Either compound could be an acid or a base. X Y concentration 2 mol dm–3 2 mol dm–3 pH 6 9 Student P concluded that X is a strong acid. Student Q concluded that the extent of dissociation is lower in X(aq) than in Y(aq). Which of the students are correct? A both P and Q B neither P nor Q C P only D Q only

Accepted Answer

D

Question 10

10 The Haber process for the manufacture of ammonia is represented by the following equation. N2(g) + 3H2(g) 2NH3(g) ∆H = –92 kJ mol–1 Which statement is correct about this reaction when the temperature is increased? A Both forward and backward rates increase. B The backward rate only increases. C The forward rate only increases. D There is no effect on the backward or forward rate.

Accepted Answer

A

Question 11

11 The percentage of ammonia obtainable, if equilibrium were established during the Haber process, is plotted against the operating pressure for two temperatures, 400 °C and 500 °C. Which diagram correctly represents the two graphs? A B 40 400 °C 40 500 °C % NH3 at % NH3 at 20 500 °C 20 400 °C equilibrium equilibrium 0 0 0 0 10 20 10 20 pressure / 103 kPa pressure / 103 kPa C D 40 40 400 °C 500 °C % NH3 at % NH3 at 20 20 equilibrium equilibrium 500 °C 400 °C 0 0 0 0 10 20 10 20 pressure / 103 kPa pressure / 103 kPa

Accepted Answer

A

Question 12

12 Swimming pool water can be kept free of harmful bacteria by adding aqueous sodium chlorate(I), NaOCl. This reacts with water to produce HOCl molecules which kill bacteria. OCl –(aq) + H2O OH–(aq) + HOCl (aq) In bright sunshine, the OCl – ion is broken down by ultra-violet light. OCl –(aq) + uv light → Cl –(aq) + ½O2(g) Which method would maintain the highest concentration of HOCl (aq)? A acidify the pool water B add a solution of chloride ions C add a solution of hydroxide ions D bubble air through the water

Accepted Answer

A

Question 13

13 Na2S2O3 reacts with dilute HCl to give a pale yellow precipitate. If 1 cm3 of 0.1 mol dm–3 HCl is added to 10 cm3 of 0.02 mol dm–3 Na2S2O3 the precipitate forms slowly. If the experiment is repeated with 1 cm3 of 0.1 mol dm–3 HCl and 10 cm3 of 0.05 mol dm–3 Na2S2O3 the precipitate forms more quickly. Why is this? A The activation energy of the reaction is lower when 0.05 mol dm–3 Na2S2O3 is used. B The reaction proceeds by a different pathway when 0.05 mol dm–3 Na2S2O3 is used. C The collisions between reactant particles are more violent when 0.05 mol dm–3 Na2S2O3 is used. D The reactant particles collide more frequently when 0.05 mol dm–3 Na2S2O3 is used.

Accepted Answer

D

Question 14

14 How does concentrated sulfuric acid behave when it reacts with sodium chloride? A as an acid only B as an acid and oxidising agent C as an oxidising agent only D as a reducing agent only

Accepted Answer

A

Question 15

15 X is a salt of one of the halogens chlorine, bromine, iodine, or astatine (proton number 85). The reaction scheme shows a series of reactions using a solution of X as the starting reagent. HNO3(aq) an excess of a colourless X a precipitate AgNO3(aq) dilute NH3(aq) solution an excess of HNO3(aq) a precipitate What could X be? A sodium chloride B sodium bromide C potassium iodide D potassium astatide

Accepted Answer

A

Question 16

16 Which element of the third period requires the least number of moles of oxygen for the complete combustion of 1 mol of the element? A aluminium B magnesium C phosphorus D sodium

Accepted Answer

D

Question 17

17 Two properties of non-metallic elements and their atoms are as follows. property 1 has an oxide that can form a strong acid in water property 2 has no paired 3p electrons Which properties do phosphorus and sulfur have? phosphorus sulfur A 1 and 2 1 only B 1 only 1 and 2 C 1 and 2 1 and 2 D 2 only 1 only

Accepted Answer

A

Question 18

18 Consecutive elements X, Y, Z are in the third period of the Periodic Table. Element Y has the highest first ionisation energy and the lowest melting point. What could be the identities of X, Y and Z? A aluminium, silicon, phosphorus B magnesium, aluminium, silicon C silicon, phosphorus, sulfur D sodium, magnesium, aluminium

Accepted Answer

C

Question 19

19 Which property of Group II elements (beryllium to barium) decreases with increasing atomic number? A reactivity with water B second ionisation energy C solubility of hydroxides D stability of the carbonates

Accepted Answer

B

Question 20

20 When gaseous chemicals are transported by road or by rail they are classified as follows. flammable non-flammable poisonous Which commonly transported gas is non-flammable? A butane B hydrogen C oxygen D propene

Accepted Answer

C

Question 21

21 What will react differently with the two isomeric alcohols, (CH3)3CCH2OH and (CH3)2CHCH2CH2OH? A acidified aqueous potassium manganate(VII) B concentrated sulfuric acid C phosphorus pentachloride D sodium

Accepted Answer

B

Question 22

22 Which reagent will give similar results with both butanone and butanal? A acidified aqueous potassium dichromate(VI) B an alkaline solution containing complexed Cu2+ ions (Fehling’s solution) C an aqueous solution containing [Ag(NH3)2]+ (Tollens’ reagent) D 2,4-dinitrophenylhydrazine reagent

Accepted Answer

D

Question 23

23 What is formed when propanone is refluxed with a solution of NaBH4? A propanal B propan-1-ol C propan-2-ol D propane

Accepted Answer

C

Question 24

24 Which compound is a product of the hydrolysis of CH3CO2C3H7 by boiling aqueous sodium hydroxide? A CH3OH B C3H7OH C C3H7CO2H D C H CO − N a + 3 7 2

Accepted Answer

B

Question 25

25 When heated with chlorine, the hydrocarbon 2,2-dimethylbutane undergoes free radical substitution. In a propagation step the free radical X• is formed. CH3 CH3CH2 C CH3 + Cl  →  X  +  HCl ● ● CH3 How many different forms of X• are possible? A 1 B 2 C 3 D 4

Accepted Answer

C

Question 26

26 When an isomer Y of molecular formula C4H9Br undergoes hydrolysis in aqueous alkali to form an alcohol C4H9OH, the rate of reaction is found to be unaffected by changes in the concentration of OH– ions present. Which is the most likely molecular structure of Y? A CH3CH2CH2CH2Br B CH3CH2CHBrCH3 C (CH3)2CHCH2Br D (CH3)3CBr

Accepted Answer

D

Question 27

27 Which isomer of C4H10O forms three alkenes on dehydration? A butan-1-ol B butan-2-ol C 2-methylpropan-1-ol D 2-methylpropan-2-ol

Accepted Answer

B

Question 28

28 Which compound exhibits both cis-trans and optical isomerism? A CH3CH=CHCH2CH3 B CH3CHBrCH=CH2 C CH3CBr=CBrCH3 D CH3CH2CHBrCH=CHBr

Accepted Answer

D

Question 29

29 In many countries plastic waste is collected separately and sorted. Some of this is incinerated to provide heat for power stations. Why is pvc, polyvinylchloride, removed from any waste that is to be incinerated? A It destroys the ozone layer. B It does not burn easily. C It is easily biodegradable. D Its combustion products are harmful.

Accepted Answer

D

Question 30

30 Polymerisation of 1,1-dichloroethene produces a dense, high melting point substance that does not allow gases to pass through. It is used as cling wrapping. Which sequence appears in a short length of the polymer chain? A [ CH2CCl2CH2CCl2CH2CCl2 ] B [ CHClCHClCHClCHClCHClCHCl ] C [ CCl2CCl2CCl2CCl2CCl2CCl2 ] D [ CH2CCl2CHClCHClCH2CCl2 ]

Accepted Answer

A

Question 31

31 Sodium hydrogensulfide, NaSH, is used to remove hair from animal hides. Which statements about the SH– ion are correct? 1 It contains 18 electrons. 2 Three lone pairs of electrons surround the sulfur atom. 3 Sulfur has an oxidation state of +2.

Accepted Answer

B

Question 32

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

Accepted Answer

B

Question 33

33 Which reactions are redox reactions? 1 CaBr2 + 2H2SO4 → CaSO4 + Br2 + SO2 + 2H2O 2 CaBr2 + 2H3PO4 → Ca(H2PO4)2 + 2HBr 3 CaBr2 + 2AgNO3 → Ca(NO3)2 + 2AgBr

Accepted Answer

D

Question 34

34 When organic refuse decomposes in water carboxylic acids are formed. The water becomes acidic and aquatic life is destroyed. Which additives are suitable to remove this acid pollution? 1 calcium carbonate 2 calcium hydroxide 3 potassium nitrate

Accepted Answer

B

Question 35

35 In a car engine, non-metallic element X forms a pollutant oxide Y. Further oxidation of Y to Z occurs in the atmosphere. In this further oxidation, 1 mol of Y reacts with ½ mol of gaseous oxygen. What can X be? 1 carbon 2 nitrogen 3 sulfur

Accepted Answer

C

Question 36

36 Sulfur dioxide and sulfites are used in food preservation. Why are they used for this purpose? 1 They are reducing agents so retard the oxidation of food. 2 They inhibit the growth of aerobic bacteria. 3 They react with NO2(g) converting it to NO(g).

Accepted Answer

B

Question 37

37 Which reactions are examples of nucleophilic substitution? 1 CH3CH2Br + OH– → CH3CH2OH + Br– H + 2 CH3I + H2O → CH3OH + HI 3 CH3CH2CH2Cl + NH3 → CH3CH2CH2NH2 + HCl

Accepted Answer

A

Question 38

38 Propanoic acid occurs naturally as a result of the bacterial fermentation of milk, and is partly responsible for the flavour of Swiss cheese. O OH propanoic acid Which starting materials could be used to synthesise propanoic acid? 1 CH3CH2CH2OH 2 CH3CH2CN 3 CH3CH2CHO

Accepted Answer

A

Question 39

39 Which structural formulae represent 2,2-dimethylpentane? 1 (CH3)2CHCH2CH(CH3)2 2 (CH3)3CCH2CH2CH3 3 CH3CH2CH2C(CH3)3

Accepted Answer

C

Question 40

40 The diagram shows some laboratory apparatus. water heat Which preparations could this apparatus be used for? 1 bromoethane, from ethanol, sodium bromide and concentrated sulfuric acid 2 ethanal, from ethanol, sodium dichromate(VI) and sulfuric acid 3 1,2-dibromoethane, from bromine and ethene

Accepted Answer

B

Question paper16 pages

Mark scheme2 pages

Questions as text

Q1 · Which gas closely approaches ideal behaviour at room temperature and pressure?

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

Q3 · Use of the Data Booklet is relevant to this question

Q4 · Some bond energy values are listed below

Q5 · Given the following enthalpy changes, I2(g) + 3Cl2(g) → 2ICl3(s) ∆Ho = –214 kJ mol–1…

Q6 · Ammonium nitrate, NH4NO3, can decompose explosively when heated

Q7 · Which mass of gas would occupy a volume of 3 dm3 at 25 °C and 1 atmosphere pressure?

Q8 · Use of the Data Booklet is relevant to this question

Q9 · The table gives the concentrations and pH values of the aqueous solutions of two…

Q10 · The Haber process for the manufacture of ammonia is represented by the following equation

Q11 · The percentage of ammonia obtainable, if equilibrium were established during the Haber…

Q12 · Swimming pool water can be kept free of harmful bacteria by adding aqueous sodium…

Q13 · Na2S2O3 reacts with dilute HCl to give a pale yellow precipitate

Q14 · How does concentrated sulfuric acid behave when it reacts with sodium chloride?

Q15 · X is a salt of one of the halogens chlorine, bromine, iodine, or astatine (proton number…

Q16 · Which element of the third period requires the least number of moles of oxygen for the…

Q17 · Two properties of non-metallic elements and their atoms are as follows

Q18 · Consecutive elements X, Y, Z are in the third period of the Periodic Table

Q19 · Which property of Group II elements (beryllium to barium) decreases with increasing…

Q20 · When gaseous chemicals are transported by road or by rail they are classified as follows

Q21 · What will react differently with the two isomeric alcohols, (CH3)3CCH2OH and…

Q22 · Which reagent will give similar results with both butanone and butanal?

Q23 · What is formed when propanone is refluxed with a solution of NaBH4?

Q24 · Which compound is a product of the hydrolysis of CH3CO2C3H7 by boiling aqueous sodium…

Q25 · When heated with chlorine, the hydrocarbon 2,2-dimethylbutane undergoes free radical…

Q26 · When an isomer Y of molecular formula C4H9Br undergoes hydrolysis in aqueous alkali to…

Q27 · Which isomer of C4H10O forms three alkenes on dehydration?

Q28 · Which compound exhibits both cis-trans and optical isomerism?

Q29 · In many countries plastic waste is collected separately and sorted

Q30 · Polymerisation of 1,1-dichloroethene produces a dense, high melting point substance that…

Q31 · Sodium hydrogensulfide, NaSH, is used to remove hair from animal hides

Q32 · Which diagrams represent part of a giant molecular structure?

Q33 · Which reactions are redox reactions?

Q34 · When organic refuse decomposes in water carboxylic acids are formed

Q35 · In a car engine, non-metallic element X forms a pollutant oxide Y

Q36 · Sulfur dioxide and sulfites are used in food preservation

Q37 · Which reactions are examples of nucleophilic substitution?

Q38 · Propanoic acid occurs naturally as a result of the bacterial fermentation of milk, and is…

Q39 · Which structural formulae represent 2,2-dimethylpentane?

Q40 · The diagram shows some laboratory apparatus

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