Cambridge A Level Chemistry 9701 — 2014 Oct/Nov Paper 1 · Variant 3

Question 1

1 The diagram below represents, for a given temperature, the Boltzmann distribution of the kinetic energy of the molecules in a mixture of two gases that react slowly together. The activation energy for the reaction, Ea, is marked. When the reaction is catalysed, the rate of reaction increases a little. What will be the position of Ea for the catalysed reaction? number of molecules kinetic Ea energy A B C D

Accepted Answer

B

Question 2

2 Use of the Data Booklet is relevant to this question. In some types of spectroscopy, it is important to know if ions are isoelectronic. This means that they contain equal numbers of electrons. Which ion is not isoelectronic with K+? A Ca2+ B Cl – C S2– D Ti3+

Accepted Answer

D

Question 3

3 Which row shows properties of a ceramic material? melting point boiling point conductivity / K / K of solid A 156 352 none B 922 1380 good C 2130 2943 good D 3125 3873 none

Accepted Answer

D

Question 4

4 Impure copper is purified by electrolysis. The electrolyte used in this process is aqueous copper(II) sulfate. Which reaction takes place at the anode? A Cu(s)  →  Cu2+(aq)  +  2e– B Cu2+(aq)  +  2e–  →  Cu(s) C 2OH–(aq)  → 1 O2 (g) +  H2O(l)  +  2e– 2 D 2H2O(l)  +  2e–  →  H2(g)  +  2OH–(aq)

Accepted Answer

A

Question 5

5 Hydrogen sulfide, H2S, is released from volcanoes. It reacts with oxygen in the air to form sulfur dioxide. 2H2S(g)  +  3O2(g)  →  2H2O(l)  +  2SO2(g) ∆Hf o [H2S(g)] = –21 kJ mol–1 ∆Hf o [H2O(l)] = –286 kJ mol–1 ∆Hf o [SO2(g)] = –297 kJ mol–1 What is the standard enthalpy change of this reaction? A –1208 kJ mol–1 B –1124 kJ mol–1 C –562 kJ mol–1 D –541 kJ mol–1

Accepted Answer

B

Question 6

6 Use of the Data Booklet is relevant to this question. In some countries, anhydrous calcium chloride is used as a drying agent to reduce dampness in houses. The anhydrous salt absorbs enough water to form the dihydrate CaCl 2.2H2O. What is the percentage increase in mass? A 14% B 24% C 32% D 36%

Accepted Answer

C

Question 7

7 Copper and iodine are both shiny crystalline solids. Which forces exist between particles in solid copper and between neighbouring iodine molecules in solid iodine? copper iodine A ionic bonds covalent bonds B ionic bonds van der Waals’ forces C metallic bonds covalent bonds D metallic bonds van der Waals’ forces

Accepted Answer

D

Question 8

8 Use of the Data Booklet is relevant to this question. Ferrochrome is an alloy of iron and chromium. Ferrochrome can be dissolved in dilute sulfuric acid to produce a mixture of FeSO4 and Cr2(SO4)3. The FeSO4 reacts with K2Cr2O7 in acid solution according to the following equation. 14H+  +  6Fe2+  +  Cr2O7 2–  →  2Cr3+  +  6Fe3+  +  7H2O When 1.00 g of ferrochrome is dissolved in dilute sulfuric acid, and the resulting solution titrated, 13.1 cm3 of 0.100 mol dm–3 K2Cr2O7 is required for complete reaction. What is the percentage by mass of Fe in the sample of ferrochrome? A 1.22 B 4.39 C 12.2 D 43.9

Accepted Answer

D

Question 9

9 Use of the Data Booklet is relevant to this question. When an evacuated glass tube of volume 200 cm3 is filled with a gas at 300 K and 101 kPa, the mass of the tube increases by 1.06 g. What is the identity of the gas? A argon B krypton C neon D xenon

Accepted Answer

D

Question 10

10 Nitrogen monoxide is an atmospheric pollutant that is formed inside car engines by an endothermic reaction between nitrogen and oxygen. N2(g)  +  O2(g)  →  2NO(g) ∆H = +66 kJ mol–1 Which labelled diagram correctly represents the energy profile for this reaction? A B energy Ea energy Ea ∆H ∆H 00 00 extent of extent of reaction reaction C D Ea Ea energy energy ∆H ∆H 00 00 extent of extent of reaction reaction

Accepted Answer

A

Question 11

11 Use of the Data Booklet is relevant to this question. When 0.47 g of a hydrocarbon was completely burnt in air, the energy released heated 200 g of water from 23.7 °C to 41.0 °C. What was the amount of energy absorbed by the water? A 0.47  ×  4.18  ×  17.3 J B 0.47  ×  4.18  ×  (273  +  17.3) J C 200  ×  4.18  ×  17.3 J D 200  ×  4.18  ×  (273  +  17.3) J

Accepted Answer

C

Question 12

12 What is the ionic equation for the reaction between aqueous sodium carbonate and dilute nitric acid? A 2HNO3(aq)  +  CO3 2–(aq)  →  H2O(l)  +  CO2(g)  +  2NO3 –(aq) B 2H+(aq)  +  CO3 2–(aq)  →  CO2(g)  +  H2O(l) C 2HNO3(aq)  +  Na2CO3(aq)  →  2NaNO3(aq)  +  CO2(g)  +  H2O(l) D 2HNO2(aq)  +  CO3 2–(aq)  →  H2O(l)  +  CO2(g)  +  2NO2 –(aq)

Accepted Answer

B

Question 13

13 Pieces of calcium and magnesium are reacted separately with cold water. Pieces of calcium and magnesium are also burned separately with oxygen. Which row correctly describes the observations from these reactions? calcium magnesium calcium magnesium with cold water with cold water with oxygen with oxygen A rapid bubbling slow bubbling red flame white flame B rapid bubbling slow bubbling white flame red flame C slow bubbling rapid bubbling red flame white flame D slow bubbling rapid bubbling white flame red flame

Accepted Answer

A

Question 14

14 X, Y and Z are compounds of three elements in Period 3. Their electrical conductivities are shown in the table. X Y Z conductivity of the compound does not does not good in the molten state conduct conduct conductivity of the mixture obtained does not good good by adding the compound to water conduct What could be compounds X, Y and Z? X Y Z A Al 2O3 SiCl 4 NaF B NaF Al 2O3 SiCl 4 C NaF SiCl 4 SiO2 D SiCl 4 Al 2O3 SiO2

Accepted Answer

C

Question 15

15 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 added, the precipitate partly dissolved leaving a darker yellow precipitate. What might the powder have consisted of? 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 16

16 X is a mixture of two compounds of Group II elements. X can undergo thermal decomposition to produce a white solid and only two gaseous products. One of the gaseous products relights a glowing splint. What could be the components of mixture X? A MgCl 2 and CaCO3 B MgCO3 and Ca(NO3)2 C Mg(NO3)2 and Ca(NO3)2 D MgO and CaSO4

Accepted Answer

C

Question 17

17 An element Y reacts according to the following sequence. burns an excess of in O2 HCl (aq) NaOH(aq) NaOH(aq) Y white solid solution white precipitate solution What could be element Y? A Al B Ca C Mg D P

Accepted Answer

A

Question 18

18 One molecule of the oxide of element Z reacts with six molecules of water to produce an acidic compound. What is element Z? A aluminium B phosphorus C sodium D sulfur

Accepted Answer

B

Question 19

19 A student examines two semi-precious stones; one is agate, SiO2, and the other is calcite, CaCO3. How could they be distinguished? A Add a fixed amount of cold aqueous sodium hydroxide to each separately and measure any temperature change. B Heat each separately over a gentle Bunsen flame and note which one melts first. C Shake each separately with dilute hydrochloric acid and test any gas formed. D Shake each separately with distilled water and add a few drops of Universal Indicator.

Accepted Answer

C

Question 20

20 In this question, structural isomerism and stereoisomerism should be considered. How many isomeric aldehydes have the formula C5H10O? A 3 B 4 C 5 D 6

Accepted Answer

C

Question 21

21 Aldehydes and ketones are carbonyl compounds. Which of them react with both LiAl H4 and Tollens’ reagent? A aldehydes only B both aldehydes and ketones C ketones only D neither aldehydes nor ketones

Accepted Answer

A

Question 22

22 Pentaerythritol is used as an intermediate in the manufacture of paint. HOCH2 CH2OH C HOCH2 CH2OH pentaerythritol Which statement about pentaerythritol is correct? A It can be dehydrated by concentrated sulfuric acid to form an alkene. B Its empirical formula and its molecular formula are different. C It does not react with acidified potassium manganate(VII). D One mole of it gives two moles of hydrogen gas on reaction with an excess of sodium.

Accepted Answer

D

Question 23

23 A compound Y, C4H9Br, undergoes hydrolysis in aqueous alkali to form an alcohol, C4H9OH. The rate of this 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 24

24 Compound X can be made from 2-hydroxybutanoic acid. O H C C O CH3CH2 CH2CH3 O C C H O compound X What should be heated with 2-hydroxybutanoic acid in order to make compound X? A acidified potassium dichromate(VI) B aluminium oxide C concentrated sulfuric acid D dilute sodium hydroxide

Accepted Answer

C

Question 25

25 The compound known as ‘gamma-linolenic acid’ is found in the seeds of the evening primrose plant. CH3(CH2)4CH=CHCH2CH=CHCH2CH=CH(CH2)4CO2H gamma-linolenic acid How many cis-trans isomers are there with this structural formula? A 3 B 6 C 8 D 12

Accepted Answer

C

Question 26

26 Pheromones are used by insects and other animals as a means of communication. The pheromone in a bee sting is 3-methylbutyl ethanoate. O CH3 C O CH2CH2CH(CH3)2 3-methylbutyl ethanoate What are the organic products when 3-methylbutyl ethanoate is heated under reflux with aqueous sodium hydroxide? A CH3CO2H  and  (CH3)2CHCH2CH2OH B CH3CO2H  and  (CH3)2CHCH2CH2O–Na+ C CH3CO2 –Na+  and  (CH3)2CHCH2CH2OH D CH3CO2 –Na+  and  (CH3)2CHCH2CH2O–Na+

Accepted Answer

C

Question 27

27 The compound 2-ethyl-3-methylbutanoic acid is used as a flavouring in some food. CH3 C2H5 CH3 C C C OH H H O 2-ethyl-3-methylbutanoic acid Which compound will produce 2-ethyl-3-methylbutanoic acid when heated under reflux with sodium cyanide in ethanol, followed by acid hydrolysis of the reaction product? CH3 A CH3 CH CH2 CHBr CH3 CH3 B CH3 CH CHBr CH2 CH3 CH3 C2H5 C CH3 CH CH CH2Br CH3 CH2Br D CH3 CH CH2 CH CH3

Accepted Answer

B

Question 28

28 Poly(ethenol) can be used to make plastic bags that dissolve in water. It may be considered to be made by addition polymerisation of CH2=CH(OH). Which structure represents a length of the polymer chain consisting of two monomer residues? A B OH H OH H H H H H C C C C O C C O C C H H H H H H H H C D H H H H H H H H C C C C O C C OH C C OH H OH H H H H H H

Accepted Answer

A

Question 29

29 The diagram shows the structure of the naturally-occurring molecule cholesterol. H3C CH3 H CH3 H H H HO cholesterol Student X stated that the seventeen carbon atoms in the four rings all lie in the same plane. Student Y stated that this molecule displays cis-trans isomerism at the C = C double bond. Which of the students are correct? A both X and Y B neither X nor Y C X only D Y only

Accepted Answer

B

Question 30

30 Methyl butanoate, C5H10O2, is an ester used in the food industry to give products the flavour of apples. O H H H H C C C C H H C O H H H H methyl butanoate Including methyl butanoate, how many structural isomers are there of C5H10O2 that are esters? A 6 B 8 C 9 D 10

Accepted Answer

C

Question 31

31 In a solution that contains both Br2 and Cl 2, a process takes place that produces BrO3 – ions. The process is represented by the following equations. equation 1 Br2  +  H2O  →  HBr  +  HBrO equation 2 3HBrO  +  Cl 2  →  2Cl –  +  BrO3 –  +  Br2  +  3H+ Which statements about these reactions are correct? 1 Chlorine is reduced in equation 2. 2 Bromine is oxidised in both equation 1 and equation 2. 3 Bromine is reduced in both equation 1 and equation 2.

Accepted Answer

A

Question 32

32 Which statements are correct when referring to the isotopes of a single element? 1 The isotopes have different masses. 2 The isotopes have different numbers of nucleons. 3 The isotopes have different chemical reactions.

Accepted Answer

B

Question 33

33 Which types of intermolecular forces can exist between adjacent urea molecules? O C H2N NH2 urea 1 hydrogen bonding 2 permanent dipole-dipole forces 3 instantaneous dipole-induced dipole forces

Accepted Answer

A

Question 34

34 Which names can be applied to the enthalpy change of the reaction shown? H2(g)  + 1 O2 (g) →  H2O(l) 2 1 enthalpy change of formation 2 enthalpy change of combustion 3 enthalpy change of hydration

Accepted Answer

B

Question 35

35 Compared with the HI molecule, the bond ……P…… of the HBr molecule is ……Q…… Which pairs of words correctly complete the above sentence? P Q 1 energy greater 2 length less 3 polarity greater

Accepted Answer

A

Question 36

36 Element X is a solid. It is found in some fuels. Its oxide Y is formed in car engines. Y is acidic. Further oxidation of Y to Z can occur in the atmosphere. Which statements about Y and Z are correct? 1 Molecule Y has lone pairs of electrons. 2 The atmospheric oxidation of Y to Z is a catalysed reaction. 3 Y is a colourless gas.

Accepted Answer

A

Question 37

37 Which statements about the photochemical chlorination of ethane are correct? 1 A propagation step in the mechanism is C2H5•  +  Cl 2  →  C2H5Cl  +  Cl •. 2 Butane is present in the products. 3 The initiation step is the heterolytic fission of chlorine.

Accepted Answer

B

Question 38

38 Which compounds produce pent-2-ene as either one of the products, or as the only product, on heating with potassium hydroxide in ethanol? 1 CH3CH2CH2CH2CH2Br 2 CH3CHBrCH2CH2CH3 3 CH3CH2CHBrCH2CH3

Accepted Answer

C

Question 39

39 Which reactions have a coloured organic product? 1 ethanal  +  2,4-dinitrophenylhydrazine reagent 2 ethanol  +  acidified potassium dichromate(VI) 3 ethene  +  cold dilute acidified potassium manganate(VII)

Accepted Answer

D

Question 40

40 Propanal will react with hydrogen cyanide to form 2-hydroxybutanenitrile. A suitable catalyst for this reaction is sodium cyanide. NaCN CH3CH2CHO  +  HCN CH3CH2CH(OH)CN Which statements about the reaction of propanal with hydrogen cyanide are correct? 1 The sodium cyanide provides a stronger nucleophile than HCN. 2 The reaction mechanism involves two steps. 3 The product of the reaction has a chiral carbon atom.

Accepted Answer

A

Question paper16 pages

Mark scheme2 pages

Questions as text

Q1 · The diagram below represents, for a given temperature, the Boltzmann distribution of the…

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

Q3 · Which row shows properties of a ceramic material?

Q4 · Impure copper is purified by electrolysis

Q5 · Hydrogen sulfide, H2S, is released from volcanoes

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

Q7 · Copper and iodine are both shiny crystalline solids

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

Q9 · Use of the Data Booklet is relevant to this question

Q10 · Nitrogen monoxide is an atmospheric pollutant that is formed inside car engines by an…

Q11 · Use of the Data Booklet is relevant to this question

Q12 · What is the ionic equation for the reaction between aqueous sodium carbonate and dilute…

Q13 · Pieces of calcium and magnesium are reacted separately with cold water

Q14 · X, Y and Z are compounds of three elements in Period 3

Q15 · A powder is known to be either a single sodium halide or a mixture of two sodium halides

Q16 · X is a mixture of two compounds of Group II elements

Q17 · An element Y reacts according to the following sequence

Q18 · One molecule of the oxide of element Z reacts with six molecules of water to produce an…

Q19 · A student examines two semi-precious stones; one is agate, SiO2, and the other is…

Q20 · In this question, structural isomerism and stereoisomerism should be considered

Q21 · Aldehydes and ketones are carbonyl compounds

Q22 · Pentaerythritol is used as an intermediate in the manufacture of paint

Q23 · A compound Y, C4H9Br, undergoes hydrolysis in aqueous alkali to form an alcohol, C4H9OH

Q24 · Compound X can be made from 2-hydroxybutanoic acid

Q25 · The compound known as ‘gamma-linolenic acid’ is found in the seeds of the evening…

Q26 · Pheromones are used by insects and other animals as a means of communication

Q27 · The compound 2-ethyl-3-methylbutanoic acid is used as a flavouring in some food

Q28 · Poly(ethenol) can be used to make plastic bags that dissolve in water

Q29 · The diagram shows the structure of the naturally-occurring molecule cholesterol

Q30 · Methyl butanoate, C5H10O2, is an ester used in the food industry to give products the…

Q31 · In a solution that contains both Br2 and Cl 2, a process takes place that produces BrO3…

Q32 · Which statements are correct when referring to the isotopes of a single element?

Q33 · Which types of intermolecular forces can exist between adjacent urea molecules?

Q34 · Which names can be applied to the enthalpy change of the reaction shown?

Q35 · Compared with the HI molecule, the bond ……P…… of the HBr molecule is ……Q…… Which pairs of…

Q36 · Element X is a solid

Q37 · Which statements about the photochemical chlorination of ethane are correct?

Q38 · Which compounds produce pent-2-ene as either one of the products, or as the only product…

Q39 · Which reactions have a coloured organic product?

Q40 · Propanal will react with hydrogen cyanide to form 2-hydroxybutanenitrile

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