Cambridge A Level Chemistry 9701 — 2012 Oct/Nov Paper 1 · Variant 3

Question 1

1 Which diagram shows the correct graph of V against p for a fixed mass of an ideal gas at constant temperature? A B C D V V V V 0 0 0 0 0 p 0 p 0 p 0 p

Accepted Answer

D

Question 2

2 Which statement can be explained by intermolecular hydrogen bonding? A Butane has a higher boiling point than propane. B Hydrogen bromide forms an acidic solution when dissolved in water. C SiH4 has a higher boiling point than CH4. D Water has a higher boiling point than CH4.

Accepted Answer

D

Question 3

3 Use of the Data Booklet is relevant to this question. The volume of a sample of ammonia was measured at a temperature of 40 °C and a pressure of 95 kPa. The volume measured was 4.32 × 10–5 m3. What is the mass of the sample of ammonia? A 2.7 × 10–5 g B 2.1 × 10–4 g C 2.7 × 10–2 g D 2.1 × 10–1 g

Accepted Answer

C

Question 4

4 Aluminium is extracted by the electrolysis of a molten mixture containing aluminium oxide. By a similar method, magnesium is extracted by the electrolysis of a molten mixture containing magnesium chloride. Which statement about this electrolysis is correct? A Chloride ions travel to the anode and are oxidised to chlorine gas. B Chloride ions travel to the anode and are reduced to chlorine gas. C Chloride ions travel to the cathode and are oxidised to chlorine gas. D Chloride ions travel to the cathode and are reduced to chlorine gas.

Accepted Answer

A

Question 5

5 Ethyne, C2H2, completely combusts, as shown in the equation. H C C H   +   2 2 1 O O   →   H2O   +   2CO2 Using the average bond enthalpies in the table, what is the enthalpy change of combustion of ethyne? average bond bond enthalpy / kJ mol–1 C H 410 C C 840 O O 496 C O 740 O H 460 C O 360 A –980 kJ mol–1 B –540 kJ mol–1 C +540 kJ mol–1 D +980 kJ mol–1

Accepted Answer

A

Question 6

6 Which diagram represents the overlap of two orbitals which will form a π bond? A B C D

Accepted Answer

B

Question 7

7 The table gives the successive ionisation energies for an element X. 1st 2nd 3rd 4th 5th 6th ionisation energy / kJ mol–1 950 1800 2700 4800 6000 12300 What could be the formula of the chloride of X? A XCl B XCl2 C XCl3 D XCl4

Accepted Answer

C

Question 8

8 The gaseous compound Z decomposes on heating. In the diagram below, Boltzmann distributions for Z at two different temperatures P and Q are shown. The lines X and Y indicate activation energies for the decomposition of Z with and without a catalyst. X Y P number of molecules Q 0 0 energy Which curve and which line describe the decomposition of Z at a higher temperature and with a catalyst present? higher temperature catalyst present A P X B P Y C Q X D Q Y

Accepted Answer

C

Question 9

9 During steel-making the impurity P4O10 is removed by reacting it with calcium oxide. The only product of this reaction is the salt calcium phosphate, Ca3(PO4)2. In this reaction, how many moles of calcium oxide react with one mole of P4O10? A 1 B 1.5 C 3 D 6

Accepted Answer

D

Question 10

10 The enthalpy change of the neutralisation given below is –114 kJ mol–1. 2NaOH(aq) + H2SO4(aq) → Na2SO4(aq) + 2H2O(l) By using this information, what is the most likely value for the enthalpy change of the following neutralisation? Ba(OH)2(aq) + 2HCl(aq) → BaCl2(aq) + 2H2O(l) A –57 kJ mol–1 B –76 kJ mol–1 C –114 kJ mol–1 D –228 kJ mol–1

Accepted Answer

C

Question 11

11 Which molecule is planar? A C2Cl 4 B C3H6 C C3H8 D NF3

Accepted Answer

A

Question 12

12 Use of the Data Booklet is relevant to this question. Why is the ionic radius of a sulfide ion larger than the ionic radius of a potassium ion? A Ionic radius always decreases with increasing atomic number. B Positive ions have smaller radii than negative ions. C The potassium ion has more protons in its nucleus than the sulfide ion. D The sulfide ion is doubly charged; the potassium ion is singly charged.

Accepted Answer

C

Question 13

13 Mohr’s salt is a pale green crystalline solid which is soluble in water. It contains two cations, one of which is Fe2+ and one anion which is SO4 2–. The identity of the second cation was determined by heating solid Mohr’s salt with solid sodium hydroxide and a colourless gas was evolved. The gas readily dissolved in water giving an alkaline solution. A grey-green solid residue was also formed which was insoluble in water. What are the identities of the gas and the solid residue? gas residue A NH3 Fe(OH)2 B NH3 Na2SO4 C SO2 Fe(OH)2 D SO2 Na2SO4

Accepted Answer

A

Question 14

14 Use of the Data Booklet is relevant to this question. When 3.00 g of an anhydrous nitrate of a Group II metal is decomposed, 1.53 g of gas is produced. What is the nitrate compound? A beryllium nitrate B calcium nitrate C magnesium nitrate D strontium nitrate

Accepted Answer

D

Question 15

15 The reaction between KI and concentrated H2SO4 is a redox reaction. 5H2SO4  +  8KI  →  4K2SO4  +  4I2  +  H2S  +  4H2O What is the change in oxidation state of the element that is reduced? A 1 B 4 C 6 D 8

Accepted Answer

D

Question 16

16 Rat poison needs to be insoluble in rain water but soluble at the low pH of stomach contents. What is a suitable barium compound to use for rat poison? A barium carbonate B barium chloride C barium hydroxide D barium sulfate

Accepted Answer

A

Question 17

17 In the Haber process, the reaction between the two gaseous reactants requires the use of a catalyst that contains a transition element. What is the metal and in what mole ratio do the gases react? metal mole ratio A Fe 1 : 2 B Fe 1 : 3 C V 1 : 2 D V 1 : 3

Accepted Answer

B

Question 18

18 Which oxide, when mixed with water, will produce the solution with the lowest pH? A CO2 B Na2O C P4O10 D SiO2

Accepted Answer

C

Question 19

19 Deposits of ammonium sulfate have been discovered in areas of high atmospheric pollution. They are believed to arise from the following reaction. SO3 + H2O + 2NH3 → (NH4)2SO4 What does not occur in this reaction? A acid / base neutralisation B dative bond formation C ionic bond formation D oxidation / reduction

Accepted Answer

D

Question 20

20 An organic compound X ● is unaffected by hot acidified potassium manganate(VII), ● reacts with ethanoic acid in the presence of concentrated sulfuric acid. What is compound X? A CH3CO2C2H5 B CH3CH2COCH3 C (CH3)3COH D CH3CH2CHOHCH3

Accepted Answer

C

Question 21

21 The diagram shows a molecule that has σ bonds and π bonds. O C CH2 CH CH2 O CH2 CH CH2 How many σ bonds are present in this molecule? A 15 B 17 C 18 D 21

Accepted Answer

C

Question 22

22 A molecule of a polymer contained the sequence shown. H H H H H Cl H H H Cl H H C C C C C C C C C C C C H Cl Cl H H H Cl H H H H Cl Which monomer could produce this polymer by addition polymerisation? A CHCl =CHCl B CH2=CHCl C CH3CCl =CHCl D CH3CCl =CH2

Accepted Answer

B

Question 23

23 Bees use 2-methylbutyl ethanoate as an ‘alarm’ pheromone to alert other bees. H O H C C H H H H H O C C C C 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 24

24 Complete combustion of compound X produces carbon dioxide and water only. X produces steamy fumes with PCl5. X does not give any visible product with 2,4-dinitrophenylhydrazine reagent. What can be deduced with certainty from this information? A X is a carboxylic acid. B X is a hydrocarbon. C X is an alcohol. D X is not an aldehyde.

Accepted Answer

D

Question 25

25 Use of the Data Booklet is relevant to this question. 2.30 g of ethanol were mixed with aqueous acidified potassium dichromate(VI) and the desired organic product was collected by immediate distillation under gentle warming. The yield of product was 70.0 %. What mass of product was collected? A 1.54 g B 1.61 g C 2.10 g D 2.20 g

Accepted Answer

A

Question 26

26 Which pair of reactions could have the same common intermediate? W CH3CH2CH3 → intermediate → (CH3)2CHCN X CH3CH(OH)CH3 → intermediate → (CH3)2C(OH)CN Y CH3CH=CH2 → intermediate → CH3CH(OH)CH3 Z CH3CO2CH2CH2CH3 → intermediate → CH3CH2CH2Br A W and X B W and Y C X and Z D Y and Z

Accepted Answer

B

Question 27

27 Santonin is a drug that was once widely used to expel parasitic worms from the body. CH3 O CH3 CH3 O O santonin When santonin is first treated with warm dilute H2SO4, and then the product of this reaction is treated with cold acidified KMnO4, a final product X is obtained. How many atoms of hydrogen in each molecule of product X can be displaced with sodium metal? A 2 B 4 C 5 D 6

Accepted Answer

D

Question 28

28 Which compound is optically active and could also be oxidised to a ketone? A 2-methylbutan-1-ol B 3-methylhexan-3-ol C 3-methylpentan-2-ol D propan-2-ol

Accepted Answer

C

Question 29

29 What is the skeletal formula of 2-methylpentan-1-ol? A B C D OH OH OH OH

Accepted Answer

C

Question 30

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

Accepted Answer

C

Question 31

31 How may nitrogen exist in compounds? 1 bonded by a triple covalent bond 2 as part of a cation 3 in an oxidation state of +5

Accepted Answer

A

Question 32

32 The phosphide ion 31 P 3– and sulfide ion 32 S 2– have the same number of which sub-atomic 15 16 particles? 1 neutrons 2 electrons 3 protons

Accepted Answer

B

Question 33

33 Which substances have a giant structure? 1 calcium oxide 2 calcium 3 baked clay found in crockery

Accepted Answer

A

Question 34

34 An element X and compound YZ react separately with acid as shown. X(s) + 2H+(aq) → X2+(aq) + H2(g) YZ(s) + 2H+(aq) → Y2+(aq) + H2Z(g) When 1.0 g of either X or YZ is reacted with an excess of acid, the total volume of gas formed is the same. Which statements are correct? 1 Ar(X) = Mr(YZ) 2 X and Y are metals. 3 X and Y must both be in the same Group of the Periodic Table.

Accepted Answer

B

Question 35

35 In the gas phase, aluminium chloride exists as the dimer, Al2Cl6. By using this information, which of the following are structural features of the Al2Cl6 molecule? 1 Each aluminium atom is surrounded by four chlorine atoms. 2 There are twelve non-bonded electron pairs in the molecule. 3 Each aluminium atom contributes electrons to four covalent bonds.

Accepted Answer

D

Question 36

36 The table describes some of the chemistry and thermodynamic properties of the halogens. name and process symbol of quantity 2HX(g) → H2(g) + X2(g) enthalpy change of reaction, H2(g) + X2(g) 2HX(g) equilibrium constant, Kp X(g) → X+(g) + e– ionisation energy, Which statements about the relative values of these quantities are correct? 1 for HCl  > for HBr 2 Kp for HBr > Kp for HI 3 for I >         for Cl

Accepted Answer

B

Question 37

37 Chloroethane can be formed from bromoethane in two steps. step X step Y C2H5Br C2H5OH C2H5Cl Which statements about these steps are correct? 1 Hot aqueous sodium hydroxide is the reagent in step X. 2 SOCl 2 is the reagent in step Y. 3 Step X is a substitution reaction.

Accepted Answer

A

Question 38

38 Which pairs of reagents will react together in a redox reaction? 1 CH3CHO + Fehling’s reagent 2 CH4 + Cl 2 3 CH3COCH3 + Tollens’ reagent

Accepted Answer

B

Question 39

39 An organic compound, X, will react with calcium metal to produce a salt with the empirical formula CaC4H4O4. What could be the identity of X? 1 ethanoic acid 2 butanedioic acid 3 2-methylpropanedioic acid

Accepted Answer

C

Question 40

40 Which changes in bonding occur during the reaction of ethanal and hydrogen cyanide? 1 A carbon-carbon bond is formed. 2 A carbon-hydrogen bond is broken. 3 A carbon-nitrogen bond is broken.

Accepted Answer

B

Question paper16 pages

Mark scheme2 pages

Questions as text

Q1 · Which diagram shows the correct graph of V against p for a fixed mass of an ideal gas at…

Q2 · Which statement can be explained by intermolecular hydrogen bonding?

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

Q4 · Aluminium is extracted by the electrolysis of a molten mixture containing aluminium oxide

Q5 · Ethyne, C2H2, completely combusts, as shown in the equation

Q6 · Which diagram represents the overlap of two orbitals which will form a π bond?

Q7 · The table gives the successive ionisation energies for an element X

Q8 · The gaseous compound Z decomposes on heating

Q9 · During steel-making the impurity P4O10 is removed by reacting it with calcium oxide

Q10 · The enthalpy change of the neutralisation given below is –114 kJ mol–1

Q11 · Which molecule is planar?

Q12 · Use of the Data Booklet is relevant to this question

Q13 · Mohr’s salt is a pale green crystalline solid which is soluble in water

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

Q15 · The reaction between KI and concentrated H2SO4 is a redox reaction

Q16 · Rat poison needs to be insoluble in rain water but soluble at the low pH of stomach…

Q17 · In the Haber process, the reaction between the two gaseous reactants requires the use of…

Q18 · Which oxide, when mixed with water, will produce the solution with the lowest pH?

Q19 · Deposits of ammonium sulfate have been discovered in areas of high atmospheric pollution

Q20 · An organic compound X ● is unaffected by hot acidified potassium manganate(VII), ● reacts…

Q21 · The diagram shows a molecule that has σ bonds and π bonds

Q22 · A molecule of a polymer contained the sequence shown

Q23 · Bees use 2-methylbutyl ethanoate as an ‘alarm’ pheromone to alert other bees

Q24 · Complete combustion of compound X produces carbon dioxide and water only

Q25 · Use of the Data Booklet is relevant to this question

Q26 · Which pair of reactions could have the same common intermediate?

Q27 · Santonin is a drug that was once widely used to expel parasitic worms from the body

Q28 · Which compound is optically active and could also be oxidised to a ketone?

Q29 · What is the skeletal formula of 2-methylpentan-1-ol?

Q30 · A possible mechanism for the exothermic hydrolysis of 2-chloro-2-methylpropane is shown

Q31 · How may nitrogen exist in compounds?

Q32 · The phosphide ion 31 P 3– and sulfide ion 32 S 2– have the same number of which…

Q33 · Which substances have a giant structure?

Q34 · An element X and compound YZ react separately with acid as shown

Q35 · In the gas phase, aluminium chloride exists as the dimer, Al2Cl6

Q36 · The table describes some of the chemistry and thermodynamic properties of the halogens

Q37 · Chloroethane can be formed from bromoethane in two steps

Q38 · Which pairs of reagents will react together in a redox reaction?

Q39 · An organic compound, X, will react with calcium metal to produce a salt with the…

Q40 · Which changes in bonding occur during the reaction of ethanal and hydrogen cyanide?

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