Cambridge A Level Chemistry 9701 — 2017 May/June Paper 1 · Variant 2

Question 1

1 In which species are the numbers of protons, neutrons and electrons all different? A 19 F − B 23 Na + C 31 P D 16 S 32 2 − 9 11 15

Accepted Answer

B

Question 2

2 Which would contain 9.03 × 1023 oxygen atoms? A 0.25 mol aluminium oxide B 0.75 mol sulfur dioxide C 1.5 mol sulfur trioxide D 3.0 mol water

Accepted Answer

B

Question 3

3 In some fireworks there is a reaction between powdered aluminium and powdered barium nitrate. Heat is evolved, an unreactive gas is produced, and all nitrogen atoms are reduced. What is the equation for this reaction? A 2Al  +  Ba(NO3)2  →  Al 2O3  +  BaO  +  2NO B 4Al  +  4Ba(NO3)2  →  2Al 2O3  +  4Ba(NO2)2  +  O2 C 10Al  +  3Ba(NO3)2  →  5Al 2O3  +  3BaO  +  3N2 D 10Al  +  18Ba(NO3)2  →  10Al (NO3)3  +  18BaO  +  3N2

Accepted Answer

C

Question 4

4 Which organic compound has the highest boiling point? A C(CH3)4 B CH3CH2CH2CH2CH3 C CH3COCH2CH3 D CH3CH(OH)CH2CH3

Accepted Answer

D

Question 5

5 At a temperature of 2500 K and a pressure of 1.00 × 10–4 Pa a sample of 0.321 g of sulfur vapour has a volume of 2.08 × 106 m3. What is the molecular formula of sulfur under these conditions? A S B S2 C S4 D S8

Accepted Answer

A

Question 6

6 Which reaction involves a decrease in the bond angle at a carbon atom? A bromoethane refluxed with ethanolic sodium hydroxide B complete combustion of methane in air C ethanol heated with conc. H2SO4 D polymerisation of ethene

Accepted Answer

D

Question 7

7 In the high temperatures of car engines, nitrogen reacts with oxygen to give nitrogen monoxide. 1 N2(g)  +  2 1 O2(g)  →  NO(g) ∆H o = +90 kJ mol–1 2 This reaction has activation energy Ea. Which reaction pathway diagram could correctly represent this reaction? A B Ea NO(g) Ea 1 N2(g)  +    O2(g) 1 1 N2(g)  +    O2(g) 1 ∆H o energy 2 2 energy 2 2 ∆H o NO(g) extent of reaction extent of reaction C D NO(g) NO(g) Ea Ea 1 N2(g)  +    O2(g) 1 ∆H o 1 N2(g)  +    O2(g) 1 ∆H o energy 2 2 energy 2 2 extent of reaction extent of reaction

Accepted Answer

C

Question 8

8 A reaction sequence is shown. 1 2 3 4 SO2 SO3 H2SO4 H2S SO2 In each stage of this sequence the sulfur is oxidised, reduced or neither oxidised nor reduced. Which row is correct? 1 2 3 4 A neither oxidised reduced reduced B oxidised neither reduced reduced C oxidised neither reduced oxidised D oxidised oxidised reduced oxidised

Accepted Answer

C

Question 9

9 Hydrogen and carbon dioxide gases are mixed at 800 K. A reversible reaction takes place. H2(g)  +  CO2(g) H2O(g)  +  CO(g) At equilibrium, the partial pressures of H2 and CO2 are both 10.0 kPa. Kp is 0.288 at 800 K. What is the partial pressure of CO in the equilibrium mixture? A 5.37 kPa B 18.6 kPa C 28.8 kPa D 347 kPa

Accepted Answer

A

Question 10

10 A reaction involved in the Contact process is shown. 2SO2(g)  +  O2(g) 2SO3(g) ∆H o = –197 kJ mol–1 The reaction is investigated at 200 kPa and 700 K and the value of the equilibrium constant, Kp, is found to be Y. The reaction is then investigated at 1000 kPa and 700 K and the value of Kp is found to be Z. Which statement comparing Y and Z is correct? A Y and Z are the same. B Y is greater than Z. C Z is 2.2 times greater than Y. D Z is 5.0 times greater than Y.

Accepted Answer

A

Question 11

11 The Boltzmann distribution for the hydrogenation of an alkene at a particular temperature in the absence of a catalyst is shown. proportion of molecules Ea with energy E 00 molecular energy E Which row correctly describes the effects of adding nickel to the reaction vessel? the shape of the activation energy, Ea Boltzmann distribution A changes decreases B changes increases C does not change decreases D does not change increases

Accepted Answer

C

Question 12

12 The elements magnesium and sulfur each form doubly charged ions. How do the atomic radii and ionic radii of these elements compare? atomic ionic atomic ionic radius radius radius radius A Mg > Mg2+ S > S2– B Mg > Mg2+ S < S2– C Mg < Mg2+ S > S2– D Mg < Mg2+ S < S2–

Accepted Answer

B

Question 13

13 Which graph correctly shows relative electronegativity plotted against relative atomic radius for the elements Na, Mg, Al and Si? A B Si Al Al electronegativity Mg electronegativity Mg Si Na Na atomic radius atomic radius C D Na Si Mg Al electronegativity Al electronegativity Mg Si Na atomic radius atomic radius

Accepted Answer

B

Question 14

14 Trends are seen in the physical and chemical properties of the elements of Group 2 and their compounds. Which property shows a decrease from magnesium to barium? A the rate of the reaction between the element and dilute hydrochloric acid B the solubility of the hydroxides C the solubility of the sulfates D the temperature of decomposition of the carbonates

Accepted Answer

C

Question 15

15 Calcium oxide is added to water and the resulting mixture is filtered. This filtrate is X. When carbon dioxide is bubbled through filtrate X, a white precipitate is formed. Which equation for this reaction of filtrate X with carbon dioxide is correct? A CaO  +  CO2  →  CaCO3 B Ca(OH)2  +  CO2  →  CaO  +  H2CO3 C 2CaO  +  H2O  +  CO2  →  CaCO3  +  Ca(OH)2 D Ca(OH)2  +  CO2  →  CaCO3  +  H2O

Accepted Answer

D

Question 16

16 Element X reacts with cold, dilute, aqueous sodium hydroxide to form two different chlorine-containing products, Y and Z. What are the oxidation states of chlorine in Y and Z? Y Z A 0 +1 B 0 +5 C –1 +1 D –1 +5

Accepted Answer

C

Question 17

17 A powder is known to be either a single sodium halide or a mixture of two sodium halides. A sample of the powder was dissolved in water. Aqueous silver nitrate was added, and a pale yellow precipitate was formed. When concentrated aqueous ammonia was then added, this precipitate partly dissolved leaving a darker yellow precipitate. What might the powder be? A sodium bromide only B sodium iodide only C a mixture of sodium chloride and sodium bromide D a mixture of sodium chloride and sodium iodide

Accepted Answer

D

Question 18

18 The ammonium ion is formed by the following reaction. NH3  +  H+  →  NH4 + Which statement about the species involved in this reaction is correct? A The ammonia molecule contains a dative covalent bond. B The ammonium ion is a Brønsted-Lowry base as it has accepted a proton. C The H–N–H bond angle changes from 107° in ammonia to 90° in the ammonium ion. D The number of electrons surrounding each nitrogen atom does not change.

Accepted Answer

D

Question 19

19 A chemist took 2.00 dm3 of nitrogen gas, measured under room conditions, and reacted it with a large volume of hydrogen gas to produce ammonia. Only 15.0% of the nitrogen gas reacted to produce ammonia. Which mass of ammonia was formed? A 0.213 g B 0.425 g C 1.42 g D 2.83 g

Accepted Answer

B

Question 20

20 A carbonyl compound X will react with HCN in the presence of NaCN to make a compound with Mr 85. Compound X does not react with Fehling’s reagent. What is X? A butanal B butanone C propanal D propanone

Accepted Answer

D

Question 21

21 Geraniol and linalool are compounds found in some flower fragrances. CH3 CH3 HO C CH2OH C H2C C H2C C H H2C H H2C CH2 CH CH C C H3C CH3 H3C CH3 geraniol linalool Which statement is correct? A They are chain isomers of each other. B They are geometrical isomers of each other. C They are optical isomers of each other. D They are positional isomers of each other.

Accepted Answer

D

Question 22

22 Which equation represents the initiation step of the substitution reaction between methane and chlorine? A CH4  →  CH3•  +  H• B CH4  →  CH3 –  +  H+ C Cl 2  →  2Cl • D Cl 2  →  Cl +  +  Cl –

Accepted Answer

C

Question 23

23 Aqueous sodium hydroxide reacts with 1-bromopropane to give propan-1-ol. What should be included in a diagram of the first step in the mechanism? A a curly arrow from a lone pair on the OH– ion to the Cδ+ atom of 1-bromopropane B a curly arrow from the Cδ+ atom of 1-bromopropane to the OH– ion C a curly arrow from the C–Br bond to the C atom D the homolytic fission of the C–Br bond

Accepted Answer

A

Question 24

24 A sample of 2.76 g of ethanol was mixed with an excess of aqueous acidified potassium dichromate(VI). The reaction mixture was then boiled under reflux for one hour. The required organic product was then collected by distillation. The yield of product was 75.0%. Which mass of product was collected? A 1.26 g B 1.98 g C 2.07 g D 2.70 g

Accepted Answer

D

Question 25

25 Compound X is a single, pure, optical isomer. X is heated with an excess of concentrated H2SO4. Only one organic product is formed. What could X be? A B C D OH OH CH2OH HO

Accepted Answer

D

Question 26

26 2-bromo-2-methylpropane undergoes nucleophilic substitution when heated under reflux with an aqueous solution of sodium hydroxide. Which row is correct? mechanism for reason this reaction A SN1 the hydroxide ion is helped in its approach to the central carbon atom by the methyl groups B SN1 the intermediate carbocation is stabilised by the inductive effect of the methyl groups C SN2 the hydroxide ion is hindered in its approach to the central carbon atom by the methyl groups D SN2 the intermediate carbocation is destabilised by the inductive effect of the methyl groups

Accepted Answer

B

Question 27

27 H2NNHC6H3(NO2)2 is the structural formula of 2,4-DNPH. 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 C10H22  →  C8H18  +  C2H4 B CH3CH2CH2Br  +  NH3  →  CH3CH2CH2NH2  +  HBr C CH3CH2OH  +  KBr  →  CH3CH2Br  +  KOH D (CH3)2CO  +  H2NNHC6H3(NO2)2  →  (CH3)2C=NNHC6H3(NO2)2  +  H2O

Accepted Answer

D

Question 28

28 A carboxylic acid, P, has no possible chain isomers. It reacts with an alcohol, Q, that has only one positional isomer. What could be the ester formed from a reaction between P and Q? A butyl propanoate B ethyl butanoate C pentyl ethanoate D propyl pentanoate

Accepted Answer

A

Question 29

29 Which compound is chiral and reacts with Na2CO3 to give CO2? A B C D CH3 OH CH2Br CH(Br)CO2H H CO2H C HCO2CH CH2 C CH3 H CO2H CH3

Accepted Answer

D

Question 30

30 Which compound, when hydrolysed, gives propanoic acid and propan-2-ol? A CH3CH2CO2CH2CH(CH3)CH3 B (CH3)2CHCO2CH2CH3 C CH3CH2CO2CH(CH3)CH3 D CH3CH2CH2CO2CH(CH3)CH3 Section B

Accepted Answer

C

Question 31

31 An isolated gaseous atom of element X has paired electrons in at least one of its 3d orbitals and has a filled 4s subshell. What could be the identity of element X? 1 iron 2 gallium 3 copper

Accepted Answer

B

Question 32

32 Which allotropes of carbon have a giant molecular structure? 1 buckminsterfullerene 2 diamond 3 graphite

Accepted Answer

C

Question 33

33 Which statements about endothermic reactions are correct? 1 On the reaction pathway diagram the products of the reaction are lower than the reactants. 2 There is a net transfer of heat energy from the surroundings to the reacting system. 3 the total bond energies of the reactants > the total bond energies of the products

Accepted Answer

C

Question 34

34 The rate of chemical reactions can be increased by the addition of a suitable catalyst. For which reactions can a heterogeneous catalyst be used? 1 N2  +  3H2 2NH3 2 2SO2  +  O2 2SO3 3 2NO  +  2CO N2  +  2CO2

Accepted Answer

A

Question 35

35 Which chlorides, when added to water, can produce a solution with a pH of less than 5? 1 SiCl 4 2 Al Cl 3 3 MgCl 2

Accepted Answer

B

Question 36

36 Acid rain continues to be a problem. Which statements about acid rain are correct? 1 Acid rain is formed when oxides of nitrogen or oxides of sulfur react with water in the atmosphere. 2 Acid rain causes an increase in the concentration of heavy metal ions in water courses. 3 Nitrogen dioxide will catalyse the formation of SO3 from SO2 in the atmosphere.

Accepted Answer

A

Question 37

37 Which compounds contain a chiral centre? 1 2-hydroxybutanoic acid 2 3-hydroxybutanoic acid 3 4-hydroxybutanoic acid

Accepted Answer

B

Question 38

38 The diagram shows the monomer used to make polyvinyl chloride, PVC. H H C C H Cl Assuming that one particular molecule of the polymer forms from n molecules of the monomer (where n is many thousands), which statements are correct? 1 The relative molecular mass of this polymer molecule is approximately 62.5n. 2 There are n chiral carbon atoms in this polymer molecule. 3 There are 5n σ bonds in one polymer molecule.

Accepted Answer

B

Question 39

39 An organic compound, X, has the following skeletal formula. OH X Which statements about X are correct? 1 X is a primary alcohol. 2 X will dehydrate to give a single alkene. 3 X will undergo a substitution reaction with chloride ions.

Accepted Answer

A

Question 40

40 2,2,4-trimethylpentanal is used in the manufacture of adhesives. Which reagents would 2,2,4-trimethylpentanal react with? 1 2,4-dinitrophenylhydrazine reagent 2 Tollens' reagent 3 alkaline aqueous iodine

Accepted Answer

B

Question paper16 pages

Mark scheme3 pages

Questions as text

Q1 · In which species are the numbers of protons, neutrons and electrons all different?

Q2 · Which would contain 9.03 × 1023 oxygen atoms?

Q3 · In some fireworks there is a reaction between powdered aluminium and powdered barium…

Q4 · Which organic compound has the highest boiling point?

Q5 · At a temperature of 2500 K and a pressure of 1.00 × 10–4 Pa a sample of 0.321 g of sulfur…

Q6 · Which reaction involves a decrease in the bond angle at a carbon atom?

Q7 · In the high temperatures of car engines, nitrogen reacts with oxygen to give nitrogen…

Q8 · A reaction sequence is shown

Q9 · Hydrogen and carbon dioxide gases are mixed at 800 K

Q10 · A reaction involved in the Contact process is shown

Q11 · The Boltzmann distribution for the hydrogenation of an alkene at a particular temperature…

Q12 · The elements magnesium and sulfur each form doubly charged ions

Q13 · Which graph correctly shows relative electronegativity plotted against relative atomic…

Q14 · Trends are seen in the physical and chemical properties of the elements of Group 2 and…

Q15 · Calcium oxide is added to water and the resulting mixture is filtered

Q16 · Element X reacts with cold, dilute, aqueous sodium hydroxide to form two different…

Q17 · A powder is known to be either a single sodium halide or a mixture of two sodium halides

Q18 · The ammonium ion is formed by the following reaction

Q19 · A chemist took 2.00 dm3 of nitrogen gas, measured under room conditions, and reacted it…

Q20 · A carbonyl compound X will react with HCN in the presence of NaCN to make a compound with…

Q21 · Geraniol and linalool are compounds found in some flower fragrances

Q22 · Which equation represents the initiation step of the substitution reaction between…

Q23 · Aqueous sodium hydroxide reacts with 1-bromopropane to give propan-1-ol

Q24 · A sample of 2.76 g of ethanol was mixed with an excess of aqueous acidified potassium…

Q25 · Compound X is a single, pure, optical isomer

Q26 · 2-bromo-2-methylpropane undergoes nucleophilic substitution when heated under reflux with…

Q27 · H2NNHC6H3(NO2)2 is the structural formula of 2,4-DNPH

Q28 · A carboxylic acid, P, has no possible chain isomers

Q29 · Which compound is chiral and reacts with Na2CO3 to give CO2?

Q30 · Which compound, when hydrolysed, gives propanoic acid and propan-2-ol?

Q31 · An isolated gaseous atom of element X has paired electrons in at least one of its 3d…

Q32 · Which allotropes of carbon have a giant molecular structure?

Q33 · Which statements about endothermic reactions are correct?

Q34 · The rate of chemical reactions can be increased by the addition of a suitable catalyst

Q35 · Which chlorides, when added to water, can produce a solution with a pH of less than 5?

Q36 · Acid rain continues to be a problem

Q37 · Which compounds contain a chiral centre?

Q38 · The diagram shows the monomer used to make polyvinyl chloride, PVC

Q39 · An organic compound, X, has the following skeletal formula

Q40 · 2,2,4-trimethylpentanal is used in the manufacture of adhesives

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