Cambridge A Level Chemistry 9701 — 2012 Oct/Nov Paper 1 · Variant 2

Question 1

1 In which reaction does an element undergo the largest change in oxidation state? A Cl 2 + 2OH– → OCl – + Cl – + H2O B 3Cl 2 + 6OH– → Cl O3 – + 5Cl – + 3H2O C Cr2O7 2– + 6Fe2+ + 14H+ → 2Cr3+ + 6Fe3+ + 7H2O D 3MnO4 2– + 4H+ → MnO2 + 2MnO4 – + 2H2O

Accepted Answer

B

Question 2

2 Use of the Data Booklet is relevant to this question. The 68Ge isotope is medically useful because it undergoes a natural radioactive process to give a gallium isotope, 68Ga, which can be used to detect tumours. This transformation of 68Ge occurs when an electron enters the nucleus, changing a proton into a neutron. Which statement about the composition of an atom of the 68Ga isotope is correct? A It has 4 electrons in its outer p subshell. B It has 13 electrons in its outer shell. C It has 37 neutrons. D Its proton number is 32.

Accepted Answer

C

Question 3

3 Sodium borohydride, NaBH4, and boron trifluoride, BF3, are compounds of boron. What are the shapes around boron in the borohydride ion and in boron trifluoride? borohydride ion boron trifluoride A square planar pyramidal B square planar trigonal planar C tetrahedral pyramidal D tetrahedral trigonal planar

Accepted Answer

D

Question 4

4 Use of the Data Booklet is relevant to this question. A reaction which causes the presence of oxides of nitrogen in car exhausts is the formation of NO. N2 + O2 → 2NO ∆H = +180 kJ mol–1 What is the bond energy in kJ mol–1 of the bond between the atoms in NO? A 655 B 835 C 1310 D 1670

Accepted Answer

A

Question 5

5 In the table below, • ‘+’ means that this type of standard enthalpy change can only have positive values, • ‘–’ means that this type of standard enthalpy change can only have negative values, • ‘+ / –’ means that either positive or negative values are possible. Which row is correct? atomisation formation solution A + + + / – B + + / – + / – C – + / – – D – – +

Accepted Answer

B

Question 6

6 Use of the Data Booklet is relevant to this question. The volume of a sample of ammonia is measured at a temperature of 60 °C and a pressure of 103 kPa. The volume measured is 5.37 × 10–3 m3. What is the mass of the sample of ammonia, given to two significant figures? A 0.00019 g B 0.0034 g C 0.19 g D 3.4 g

Accepted Answer

D

Question 7

7 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 the extraction of magnesium is correct? A Magnesium ions travel to the anode and are oxidised to magnesium metal. B Magnesium ions travel to the anode and are reduced to magnesium metal. C Magnesium ions travel to the cathode and are oxidised to magnesium metal. D Magnesium ions travel to the cathode and are reduced to magnesium metal.

Accepted Answer

D

Question 8

8 Some car paints contain small flakes of silica, SiO2. In the structure of solid SiO2 ● each silicon atom is bonded to x oxygen atoms, ● each oxygen atom is bonded to y silicon atoms, ● each bond is a z type bond. What is the correct combination of x, y and z in this statement? x y z A 2 1 covalent B 2 1 ionic C 4 2 covalent D 4 2 ionic

Accepted Answer

C

Question 9

9 John Dalton’s atomic theory, published in 1808, contained four predictions about atoms. Which of his predictions is still considered to be correct? A All atoms are very small in size. B All the atoms of a particular element have the same mass. C All the atoms of one element are different in mass from all the atoms of other elements. D No atom can be split into simpler parts.

Accepted Answer

A

Question 10

10 A student calculated the standard enthalpy change of formation of ethane, C2H6, using a method based on standard enthalpy changes of combustion. He used correct values for the standard enthalpy change of combustion of ethane (–1560 kJ mol–1) and hydrogen (–286 kJ mol–1) but he used an incorrect value for the standard enthalpy change of combustion of carbon. He then performed his calculation correctly. His final answer was –158 kJ mol–1. What did he use for the standard enthalpy change of combustion of carbon? A –1432 kJ mol–1 B –860 kJ mol–1 C –430 kJ mol–1 D –272 kJ mol–1

Accepted Answer

C

Question 11

11 Which process could be used to calculate the bond energy for the covalent bond X-Y by dividing its ∆H by n? A XYn(g) → X(g) + nY(g) B 2XYn (g) → 2XYn-1(g) + Y2(g) C Y(g) + XYn-1(g) → XYn(g) D nXY(g) → nX(g) + n Y2(g) 2

Accepted Answer

A

Question 12

12 In which pair do the molecules have the same shape as each other? A H2O and CO2 B H2O and SCl 2 C NH3 and BH3 D SCl 2 and BeCl 2

Accepted Answer

B

Question 13

13 Why is the ionic radius of a chloride ion larger than the ionic radius of a sodium ion? A A chloride ion has one more occupied electron shell than a sodium ion. B Chlorine has a higher proton number than sodium. C Ionic radius increases regularly across the third period. D Sodium is a metal, chlorine is a non-metal.

Accepted Answer

A

Question 14

14 What are the trends in the stated properties as Group II is descended from magnesium to barium? decomposition temperature of the first ionisation energy carbonate A decreases decreases B decreases increases C increases decreases D increases increases

Accepted Answer

C

Question 15

15 Use of the Data Booklet is relevant to this question. The nitrates of beryllium, calcium, magnesium, and strontium all decompose in the same way when heated. When 2.00 g of one of these anhydrous nitrates is decomposed, 1.32 g of gas is produced. What is the nitrate? A beryllium nitrate B calcium nitrate C magnesium nitrate D strontium nitrate

Accepted Answer

B

Question 16

16 In a car engine, non-metallic element X forms a pollutant oxide Y. Y can be further oxidised to Z. Two students made the following statements. Student P The molecule of Y contains lone pairs of electrons. Student Q The oxidation number of X increases by 1 from Y to Z. X could be carbon or nitrogen or sulfur. Which student could be correct if X were any of these elements? A P only B Q only C both P and Q D neither P nor Q

Accepted Answer

A

Question 17

17 Use of the Data Booklet is relevant to this question. 1.15 g of a metallic element reacts with 300 cm3 of oxygen at 298 K and 1 atm pressure, to form an oxide which contains O2– ions. What could be the identity of the metal? A calcium B magnesium C potassium D sodium

Accepted Answer

D

Question 18

18 Elements X and Y are both in period three. When the chloride of X is added to water, it reacts and a solution of pH 2 is produced. When the chloride of Y is added to water, it dissolves and a solution of pH 7 is produced. Which statement explains these observations? A Both chlorides hydrolyse in water. B X is phosphorus and Y is aluminium. C X is silicon and Y is sodium. D X is sodium and Y is phosphorus.

Accepted Answer

C

Question 19

19 Which diagram shows the variation of the metallic radius r of the Group I elements, Li, Na, K and Rb, with increasing proton (atomic) number? A B C D r r r r proton number proton number proton number proton number

Accepted Answer

A

Question 20

20 Carvone is found in spearmint. CH3 O C H C C H2C CH2 C C H H3C CH2 carvone How many σ and π bonds are present in this molecule? σ π A 13 3 B 22 3 C 22 6 D 25 3

Accepted Answer

D

Question 21

21 An alkene has the formula CH3CH=CR CH2CH3 and does not possess cis-trans isomers. What is R ? A H B Cl C CH3 D C2H5

Accepted Answer

D

Question 22

22 Menthol is an important compound extracted from the peppermint plant. CH3 OH H3C CH3 menthol How many chiral centres are there in one molecule of menthol? A 1 B 2 C 3 D 4

Accepted Answer

C

Question 23

23 The cracking of a single hydrocarbon molecule, CnH2n+2, produces two hydrocarbon molecules only. Each hydrocarbon product contains the same number of carbon atoms in one molecule. Each hydrocarbon product has non-cyclic structural isomers. What is the value of n? A 4 B 6 C 8 D 9

Accepted Answer

C

Question 24

24 But-2-ene-1,4-diol is converted in two steps through an intermediate X into ketobutanedioic acid. hot acidified KMnO4 HOCH2CH=CHCH2OH X HO2CCOCH2CO2H step 1 step 2 but-2-ene-1,4-diol ketobutanedioic acid What could be the reagent for step 1 and the intermediate X? reagent for step 1 X A cold acidified KMnO4 HOCH2CH2CH(OH)CH2OH B hot acidified KMnO4 OHCCH(OH)CH2CHO C steam and concentrated H2SO4 HOCH2CH(OH)CH2CH2OH D warm acidified K2Cr2O7 HO2CCH=CHCO2H

Accepted Answer

C

Question 25

25 One of the reactions taking place in a catalytic converter in a car exhaust system is between nitrogen oxide and octane (unburned petrol). The products of this reaction are non-toxic. Which is the correct equation for the reaction? A C8H16 + 16NO → 8CO + 8N2 + 8H2O B C8H16 + 24NO → 8CO2 + 12N2 + 8H2O C C8H18 + 17NO → 8CO + 8 2 1 N2 + 9H2O D C8H18 + 25NO → 8CO2 + 12 2 1 N2 + 9H2O

Accepted Answer

D

Question 26

26 High-energy radiation in the stratosphere produces free-radicals from chlorofluoroalkanes, commonly known as CFCs. Which free-radical is most likely to result from the irradiation of CHFCl CF2Cl ? A CHFCl CFCl B CHCl CF2Cl C CHFCF2Cl D CFCl CF2Cl

Accepted Answer

C

Question 27

27 Which reagent reacts with ethanol and also reacts with ethanoic acid? A acidified potassium dichromate(VI) B sodium C sodium carbonate D sodium hydroxide

Accepted Answer

B

Question 28

28 In 1903 Arthur Lapworth became the first chemist to investigate a reaction mechanism. The reaction he investigated was that of hydrogen cyanide with propanone. What do we now call the mechanism of this reaction? A electrophilic addition B electrophilic substitution C nucleophilic addition D nucleophilic substitution

Accepted Answer

C

Question 29

29 Many, but not all, organic reactions need to be heated before reaction occurs. Which reaction occurs at a good rate at room temperature (20 °C)? A CH3OH + PCl 5 → CH3Cl + POCl 3 + HCl B CH3CH2Br + KCN → CH3CH2CN + KBr C CH3CH2OH → C2H4 + H2O D CH3CH2CN + 2H2O → CH3CH2CO2H + NH3

Accepted Answer

A

Question 30

30 Compound X, C6H12O, is oxidised by acidified sodium dichromate(VI) to compound Y. Compound Y reacts with ethanol in the presence of a little concentrated sulfuric acid to give liquid Z. What is the formula of Z? A CH3(CH2)4COCH2CH3 B CH3(CH2)4CO2CH2CH3 C CH3CH2CO2(CH2)4CH3 D CH3CO2(CH2)5CH3

Accepted Answer

B

Question 31

31 How may nitrogen exist in compounds? 1 bonded by a triple covalent bond 2 as part of a cation 3 having lost 3 electrons to form an anion

Accepted Answer

B

Question 32

32 Use of the Data Booklet is relevant to this question. The isotope 99Tc is radioactive and has been found in lobsters and seaweed adjacent to nuclear fuel reprocessing plants. Which statements are correct about an atom of 99Tc? 1 It has 13 more neutrons than protons. 2 It has 43 protons. 3 It has 99 nucleons.

Accepted Answer

A

Question 33

33 Which of these substances have a giant structure? 1 silicon(IV) oxide 2 baked clay found in crockery 3 phosphorus(V) oxide

Accepted Answer

B

Question 34

34 The element astatine, At, is below iodine in Group VII of the Periodic Table. Which statements concerning At will be correct? 1 It is a dark-coloured solid at room temperature. 2 It is a more powerful oxidising agent than iodine. 3 Its hydride is thermally stable.

Accepted Answer

D

Question 35

35 Which equations represent stages in the Contact process for manufacturing sulfuric acid? 1 O2 → SO3 1 SO2 + 2 2 SO2 + H2O → H2SO3 1 O2 → H2SO4 3 H2SO3 + 2

Accepted Answer

D

Question 36

36 When added to water, which oxides will not cause a change in pH? 1 Al 2O3 2 SiO2 3 P4O10

Accepted Answer

B

Question 37

37 Which reagents and conditions will convert propane into 1-chloropropane? 1 Cl 2 and sunlight 2 conc. HCl, reflux 3 PCl 5

Accepted Answer

D

Question 38

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

Accepted Answer

B

Question 39

39 Which reagents react with butanone, C2H5COCH3? 1 Tollens’ reagent 2 sodium borohydride 3 2,4-dinitrophenylhydrazine reagent

Accepted Answer

C

Question 40

40 Oleic acid is found in olive oil. It has the following formula. H H C C O CH3(CH2)7 (CH2)7 C OH Which reagents will give a positive result with oleic acid? 1 aqueous bromine 2 acidified potassium dichromate(VI) 3 Fehling’s reagent

Accepted Answer

D

Question paper16 pages

Mark scheme2 pages

Questions as text

Q1 · In which reaction does an element undergo the largest change in oxidation state?

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

Q3 · Sodium borohydride, NaBH4, and boron trifluoride, BF3, are compounds of boron

Q4 · Use of the Data Booklet is relevant to this question

Q5 · In the table below, • ‘+’ means that this type of standard enthalpy change can only have…

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

Q7 · Aluminium is extracted by the electrolysis of a molten mixture containing aluminium oxide

Q8 · Some car paints contain small flakes of silica, SiO2

Q9 · John Dalton’s atomic theory, published in 1808, contained four predictions about atoms

Q10 · A student calculated the standard enthalpy change of formation of ethane, C2H6, using a…

Q11 · Which process could be used to calculate the bond energy for the covalent bond X-Y by…

Q12 · In which pair do the molecules have the same shape as each other?

Q13 · Why is the ionic radius of a chloride ion larger than the ionic radius of a sodium ion?

Q14 · What are the trends in the stated properties as Group II is descended from magnesium to…

Q15 · Use of the Data Booklet is relevant to this question

Q16 · In a car engine, non-metallic element X forms a pollutant oxide Y

Q17 · Use of the Data Booklet is relevant to this question

Q18 · Elements X and Y are both in period three

Q19 · Which diagram shows the variation of the metallic radius r of the Group I elements, Li…

Q20 · Carvone is found in spearmint

Q21 · An alkene has the formula CH3CH=CR CH2CH3 and does not possess cis-trans isomers

Q22 · Menthol is an important compound extracted from the peppermint plant

Q23 · The cracking of a single hydrocarbon molecule, CnH2n+2, produces two hydrocarbon…

Q24 · But-2-ene-1,4-diol is converted in two steps through an intermediate X into…

Q25 · One of the reactions taking place in a catalytic converter in a car exhaust system is…

Q26 · High-energy radiation in the stratosphere produces free-radicals from…

Q27 · Which reagent reacts with ethanol and also reacts with ethanoic acid?

Q28 · In 1903 Arthur Lapworth became the first chemist to investigate a reaction mechanism

Q29 · Many, but not all, organic reactions need to be heated before reaction occurs

Q30 · Compound X, C6H12O, is oxidised by acidified sodium dichromate(VI) to compound Y

Q31 · How may nitrogen exist in compounds?

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

Q33 · Which of these substances have a giant structure?

Q34 · The element astatine, At, is below iodine in Group VII of the Periodic Table

Q35 · Which equations represent stages in the Contact process for manufacturing sulfuric acid?

Q36 · When added to water, which oxides will not cause a change in pH?

Q37 · Which reagents and conditions will convert propane into 1-chloropropane?

Q38 · Chloroethane can be formed from bromoethane in two steps

Q39 · Which reagents react with butanone, C2H5COCH3?

Q40 · Oleic acid is found in olive oil

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