Cambridge A Level Chemistry 9701 — 2012 May/June Paper 1 · Variant 1

Question 1

1 In which species does the underlined atom have an incomplete outer shell? A BF3 B CH3 – C F2O D H3O+

Accepted Answer

A

Question 2

2 Ammonia is manufactured by the Haber Process, in an exothermic reaction. Assuming that the amount of catalyst remains constant, which change will not bring about an increase in the rate of the forward reaction? A decreasing the size of the catalyst pieces B increasing the pressure C increasing the temperature D removing the ammonia as it is formed

Accepted Answer

D

Question 3

3 The equation for a reaction is shown. H2(g) + 2 1 O2(g) → H2O(l) ; ∆H = x kJ mol–1 Which pair of descriptions is fully correct for this reaction? type(s) of enthalpy change value of x A formation only positive B formation only negative C combustion, formation positive D combustion, formation negative

Accepted Answer

D

Question 4

4 The value of the second ionisation energy of calcium is 1150 kJ mol–1 . Which equation correctly represents this statement? A Ca(g) → Ca2+(g) + 2e− ; ∆H o = +1150 kJ mol–1 B Ca+(g) → Ca2+(g) + e− ; ∆H o = +1150 kJ mol–1 C Ca+(g) → Ca2+(g) + e− ; ∆H o = –1150 kJ mol–1 D Ca(g) → Ca2+(g) + 2e− ; ∆H o = –1150 kJ mol–1

Accepted Answer

B

Question 5

5 Two conversions are outlined below. NH4 + → NH3 C2H4 → C2H6 What similar feature do these two conversions have? A a lone pair of electrons in the product B change in oxidation state of an element C decrease in bond angle of the species involved D disappearance of a π bond

Accepted Answer

C

Question 6

6 Use of the Data Booklet is relevant to this question. The gas laws can be summarised in the ideal gas equation. pV = nRT 0.56 g of ethene gas is contained in a vessel at a pressure of 102 kPa and a temperature of 30 °C. What is the volume of the vessel? A 49 cm3 B 494 cm3 C 48 900 cm3 D 494 000 cm3

Accepted Answer

B

Question 7

7 Propanone has the molecular formula C3H6O. The enthalpy change of combustion of hydrogen is –286 kJ mol–1. The enthalpy change of combustion of carbon is –394 kJ mol–1. The enthalpy change of combustion of propanone is –1786 kJ mol–1. Using this information, what is the enthalpy change of formation of propanone? A –1106 kJ mol–1 B –540 kJ mol–1 C –254 kJ mol–1 D +1106 kJ mol–1

Accepted Answer

C

Question 8

8 Under which set of conditions is a gas most likely to behave ideally? temperature pressure A high high B high low C low high D low low

Accepted Answer

B

Question 9

9 Two moles of compound P were placed in a vessel. The compound P was partly decomposed by heating. A dynamic equilibrium between chemicals P, Q and R was established. At equilibrium, x mol of R were present and the total number of moles present was (2 + x). What is the equation for this equilibrium? A P 2Q + R B 2P 2Q + R C 2P Q + R D 2P Q + 2R

Accepted Answer

B

Question 10

10 The oxide of titanium, TiO2, is used as a ‘whitener’ in toothpaste. It is obtained from the ore iron(II) titanate, FeTiO3. What is the change, if any, in the oxidation number (oxidation state) of titanium in the reaction FeTiO3 → TiO2? A It is oxidised from +3 to +4. B It is reduced from +3 to +2. C It is reduced from +6 to +4. D There is no change in the oxidation number.

Accepted Answer

D

Question 11

11 The diagram shows a cell for the manufacture of aluminium. graphite anodes mixture of Al 2O3 and molten cryolite graphite lining acting as cathode molten aluminium Which statement is incorrect? A Aluminium ions are oxidised in this process. B Aluminium is liberated at the cathode by the reaction Al 3+ + 3e– → Al . C The cryolite acts as a solvent. D The graphite anode burns away.

Accepted Answer

A

Question 12

12 Aluminium chloride catalyses certain reactions by forming carbocations with chloroalkanes as shown. RCl + Al Cl 3 → R+ + Al Cl 4 – Which property makes this reaction possible? A Al Cl 3 exists as the dimer Al 2Cl 6 in the vapour. B Al Cl 3 is a covalent molecule. C The aluminium atom in Al Cl 3 has an incomplete octet of electrons. D The chlorine atom in RCl has a vacant p orbital.

Accepted Answer

C

Question 13

13 Use of the Data Booklet is relevant to this question. When a mineral was heated in a Bunsen flame to constant mass, a colourless gas that turned lime water milky was evolved. The remaining solid was cooled and then added to aqueous hydrochloric acid. Vigorous effervescence was seen. What was the mineral? A aragonite, CaCO3 B artinite, MgCO3.Mg(OH)2.3H2O C barytocalcite, BaCO3.CaCO3 D dolomite, CaCO3.MgCO3

Accepted Answer

C

Question 14

14 Use of the Data Booklet is relevant to this question. The reaction between aluminium powder and anhydrous barium nitrate is used as the propellant in some fireworks. The metal oxides and nitrogen are the only products. Which volume of nitrogen, measured under room conditions, is produced when 0.783 g of anhydrous barium nitrate reacts with an excess of aluminium? A 46.8 cm3 B 72.0 cm3 C 93.6 cm3 D 144 cm3

Accepted Answer

B

Question 15

15 The oxides BaO, CaO, MgO and SrO all produce alkaline solutions when added to water. Which oxide produces the saturated solution with the highest pH? A BaO(aq) B CaO(aq) C MgO(aq) D SrO(aq)

Accepted Answer

A

Question 16

16 In the treatment of domestic water supplies, chlorine is added to the water to form HCl O. Cl 2(aq) + H2O(I) → H+(aq) + Cl –(aq) + HCl O(aq) The HCl O reacts further to give Cl O– ions. HCl O(aq) + H2O(I) → H3O+(aq) + Cl O–(aq) Both HCl O and Cl O– kill bacteria by oxidation. What is the overall change in oxidation number of chlorine when forming the Cl O– ion from the aqueous chlorine? A –1 B 0 C +1 D +2

Accepted Answer

C

Question 17

17 What trend is observed on descending Group VII? A The colours of the elements become lighter. B The elements become more volatile. C The hydrides of the elements become more thermally stable. D The reactions of the elements with hydrogen become less vigorous.

Accepted Answer

D

Question 18

18 The following two experiments are carried out with anhydrous potassium chloride and observations X and Y are made at the end of each experiment. Concentrated sulfuric acid is added to the potassium chloride and the fumes produced are bubbled into aqueous potassium iodide solution - observation X. The potassium chloride is dissolved in aqueous ammonia and this is then added to aqueous silver nitrate - observation Y. What are the observations X and Y? X Y A brown solution colourless solution B brown solution white precipitate C colourless solution colourless solution D colourless solution white precipitate

Accepted Answer

C

Question 19

19 Carbon monoxide, CO, nitrogen monoxide, NO, and sulfur dioxide, SO2, may all be present in the exhaust fumes from a car engine. Which reaction concerning these compounds occurs in the atmosphere? A CO is spontaneously oxidised to CO2 B NO2 is reduced to NO by CO C NO2 is reduced to NO by SO2 D SO2 is oxidised to SO3 by CO2

Accepted Answer

C

Question 20

20 Fumaric acid can be converted into oxaloacetic acid by a two-step process involving the intermediate Q. step 1 step 2 HO2CCH=CHCO2H Q HO2CCOCH2CO2H fumaric acid oxaloacetic acid Each of these steps can be achieved in the laboratory by a single reagent. What could be the intermediate Q and the reagent for step 2? Q reagent for step 2 A HO2CCHBrCH2CO2H warm acidified KMnO4 B HO2CCHBrCH(OH)CO2H warm NaOH(aq) C HO2CCH(OH)CH2CO2H Fehling’s solution D HO2CCH(OH)CH2CO2H warm acidified K2Cr2O7

Accepted Answer

D

Question 21

21 An organic compound J reacts with sodium to produce an organic ion with a charge of –3. J reacts  with NaOH(aq) to produce an organic ion with a charge of –1. What could be the structural formula of J? A HO2CCH(OH)CH2CO2H B HO2CCH(OH)CH2CHO C HOCH2CH(OH)CH2CO2H D HOCH2COCH2CHO

Accepted Answer

C

Question 22

22 Use of the Data Booklet is relevant to this question. A sample of ethyl propanoate is hydrolysed by heating under reflux with aqueous sodium hydroxide. The two organic products of the hydrolysis are separated, purified and weighed. Out of the total mass of products obtained, what is the percentage by mass of each product? A 32.4 % and 67.6 % B 38.3 % and 61.7 % C 42.3 % and 57.7 % D 50.0 % and 50.0 %

Accepted Answer

A

Question 23

23 Compound C is used in textile and leather processing. O O C CH2 compound C H2C C O O Which starting material(s), on gentle heating with a few drops of concentrated sulfuric acid, generates compound C? A CH3COOH only B HOCH2COOH only C CH3COOCH2COOH only D CH3COOH mixed with HOCH2COOH

Accepted Answer

B

Question 24

24 How many isomeric esters have the molecular formula C4H8O2? A 2 B 3 C 4 D 5

Accepted Answer

C

Question 25

25 Which compound, on reaction with hydrogen cyanide, produces a compound with a chiral centre? A CH3CHO B CH3CH2COCH2CH3 C CH3CO2CH3 D HCHO

Accepted Answer

A

Question 26

26 CH3COCH2CH2OH CH3COCH2CHO CH3CH(OH)CH2CH3 CH3CH2CH2CHO W X Y Z Which of these compounds can be oxidised by acidified dichromate(VI) solution and also gives a positive response to Tollens’ reagent? A W and X only B W and Y only C X and Z only D Y and Z only

Accepted Answer

C

Question 27

27 The presence of halogen in an organic compound may be detected by warming the organic compound with aqueous silver nitrate. Which compound would produce a precipitate quickest? A B C D Cl F Cl F Cl Cl Br F Cl F F I

Accepted Answer

D

Question 28

28 A reaction pathway diagram is shown. energy reaction pathway Which reaction does not have such a profile? NaCN A CH3CHO + HCN CH3CH(OH)CN B C2H5Br + NaOH → C2H5OH + NaBr C (CH3)3CBr + NaOH → (CH3)3 COH + NaBr Br D + Br2 Br

Accepted Answer

B

Question 29

29 The depletion of the ozone layer in the upper atmosphere reduces the Earth’s natural protection from harmful ultraviolet radiation. Which compound would cause the most depletion of the ozone layer? A CCl 3F B CF4 C CHCl F2 D CH2F2

Accepted Answer

A

Question 30

30 Which statement does not correctly describe the polymer PVC? A Combustion of PVC waste produces a highly acidic gas. B PVC molecules are saturated. C The empirical formula of PVC is the same as the empirical formula of its monomer. D The repeat unit of PVC is –(CHCl CHCl )–.

Accepted Answer

D

Question 31

31 The gas laws can be summarised in the ideal gas equation. pV = nRT where each symbol has its usual meaning. Which statements are correct? 1 One mole of an ideal gas occupies the same volume under the same conditions of temperature and pressure. 2 The density of an ideal gas at constant pressure is inversely proportional to the temperature, T. 3 The volume of a given mass of an ideal gas is doubled if its temperature is raised from 25 °C to 50 °C at constant pressure.

Accepted Answer

B

Question 32

32 Use of the Data Booklet is relevant to this question. In which pairs do both species have the same number of unpaired p electrons? 1 O and Cl + 2 F+ and Ga– 3 P and Ne+

Accepted Answer

B

Question 33

33 Nitrogen and phosphorus are both in Group V of the Periodic Table. Phosphorus forms a chloride with the formula PCl 5. Why is it not possible for nitrogen to form NCl 5? 1 Nitrogen’s outer shell can only contain eight electrons. 2 Nitrogen cannot have oxidation state +5. 3 Nitrogen is almost inert.

Accepted Answer

D

Question 34

34 Ammonia and chlorine react in the gas phase. 8NH3 + 3Cl 2 → N2 + 6NH4Cl Which statements are correct? 1 Ammonia behaves as a reducing agent. 2 Ammonia behaves as a base. 3 The oxidation number of the hydrogen changes

Accepted Answer

B

Question 35

35 Which statements are correct for all three halogens, chlorine, bromine and iodine? 1 They all form hydrides that are strong acids in aqueous solution. 2 They all react with aqueous sodium hydroxide to form oxo-anions. 3 They all require one more electron to fill the p orbitals of their outer shells.

Accepted Answer

A

Question 36

36 In the manufacture of sulfuric acid the reaction 2SO2(g) + O2(g) 2SO3(g) usually takes place at 400 °C and 1 atm pressure. In one industrial plant, it is decided to change the pressure to 20 atm. What will be the consequences of this change? 1 increased running costs 2 an increased percentage of sulfur trioxide in the equilibrium mixture 3 the rate of the backward reaction increases

Accepted Answer

A

Question 37

37 What is always involved in a carbon-carbon π bond? 1 a shared pair of electrons 2 a sideways overlap of p orbitals 3 delocalised electrons

Accepted Answer

B

Question 38

38 A number of alcohols with the formula C4H10O are separately oxidised. Using 70 g of the alcohols a 62 % yield of organic product is achieved. What mass of product could be obtained? 1 42.2 g of butanone 2 51.6 g of butanoic acid 3 51.6 g of 2-methyl propanoic acid

Accepted Answer

A

Question 39

39 The compound cis-hex-3-enal is responsible for the characteristic smell of cut grass. The human nose is particularly sensitive to this compound, being able to detect 0.25 parts per billion in air. O cis-hex-3-enal Which reagents will react with cis-hex-3-enal? 1 sodium 2 sodium borohydride 3 Fehling’s reagent

Accepted Answer

C

Question 40

40 How can a good yield of ethylamine be made using bromoethane as starting material? 1 by heating bromoethane with an excess of ammonia gas in a sealed tube 2 by adding dilute aqueous ammonia to bromoethane at room temperature 3 by heating bromoethane under reflux with aqueous ammonium chloride

Accepted Answer

D

Question paper16 pages

Mark scheme2 pages

Questions as text

Q1 · In which species does the underlined atom have an incomplete outer shell?

Q2 · Ammonia is manufactured by the Haber Process, in an exothermic reaction

Q3 · The equation for a reaction is shown

Q4 · The value of the second ionisation energy of calcium is 1150 kJ mol–1

Q5 · Two conversions are outlined below

Q6 · Use of the Data Booklet is relevant to this question

Q7 · Propanone has the molecular formula C3H6O

Q8 · Under which set of conditions is a gas most likely to behave ideally?

Q9 · Two moles of compound P were placed in a vessel

Q10 · The oxide of titanium, TiO2, is used as a ‘whitener’ in toothpaste

Q11 · The diagram shows a cell for the manufacture of aluminium

Q12 · Aluminium chloride catalyses certain reactions by forming carbocations with chloroalkanes…

Q13 · Use of the Data Booklet is relevant to this question

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

Q15 · The oxides BaO, CaO, MgO and SrO all produce alkaline solutions when added to water

Q16 · In the treatment of domestic water supplies, chlorine is added to the water to form HCl O

Q17 · What trend is observed on descending Group VII?

Q18 · The following two experiments are carried out with anhydrous potassium chloride and…

Q19 · Carbon monoxide, CO, nitrogen monoxide, NO, and sulfur dioxide, SO2, may all be present…

Q20 · Fumaric acid can be converted into oxaloacetic acid by a two-step process involving the…

Q21 · An organic compound J reacts with sodium to produce an organic ion with a charge of –3

Q22 · Use of the Data Booklet is relevant to this question

Q23 · Compound C is used in textile and leather processing

Q24 · How many isomeric esters have the molecular formula C4H8O2?

Q25 · Which compound, on reaction with hydrogen cyanide, produces a compound with a chiral…

Q26 · CH3COCH2CH2OH CH3COCH2CHO CH3CH(OH)CH2CH3 CH3CH2CH2CHO W X Y Z Which of these compounds…

Q27 · The presence of halogen in an organic compound may be detected by warming the organic…

Q28 · A reaction pathway diagram is shown

Q29 · The depletion of the ozone layer in the upper atmosphere reduces the Earth’s natural…

Q30 · Which statement does not correctly describe the polymer PVC?

Q31 · The gas laws can be summarised in the ideal gas equation

Q32 · Use of the Data Booklet is relevant to this question

Q33 · Nitrogen and phosphorus are both in Group V of the Periodic Table

Q34 · Ammonia and chlorine react in the gas phase

Q35 · Which statements are correct for all three halogens, chlorine, bromine and iodine?

Q36 · In the manufacture of sulfuric acid the reaction 2SO2(g) + O2(g) 2SO3(g) usually takes…

Q37 · What is always involved in a carbon-carbon π bond?

Q38 · A number of alcohols with the formula C4H10O are separately oxidised

Q39 · The compound cis-hex-3-enal is responsible for the characteristic smell of cut grass

Q40 · How can a good yield of ethylamine be made using bromoethane as starting material?

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