Cambridge A Level Chemistry 9701 — 2019 Oct/Nov Paper 1 · Variant 2

Question 1

1 The diagram shows a Boltzmann distribution of the energies of gaseous molecules and the activation energies, Ea, of a reaction with and without a catalyst. proportion of molecules with energy, E 00 Ea1 Ea2 molecular energy, E Which statement about this distribution curve is correct? A If the temperature of the gas is increased, the maximum of the curve becomes higher. B If the temperature of the gas is increased, the maximum of the curve moves to the left. C The fraction of molecules that react in the presence of a catalyst is shown by . D The fraction of molecules that react in the absence of a catalyst is shown by .

Accepted Answer

D

Question 2

2 In this question it should be assumed that (NH4)2CO3.H2O(s) dissolves in water without causing an increase in volume. Which mass of (NH4)2CO3.H2O(s) should be added to 800 cm3 of water to form a 0.100 mol dm–3 solution of NH4 + ions? A 4.56 g B 7.13 g C 9.12 g D 14.3 g

Accepted Answer

A

Question 3

3 The graph shows the successive ionisation energies of element X and element Y. Both elements are in Period 3. key element X element Y energy 0 1 2 3 4 5 6 7 8 9 10 successive ionisation energies Which statement is correct? A An atom of element X needs one extra electron for a full outer shell; an atom of element Y needs three extra electrons for a full outer shell. B An atom of element Y has five electrons in the 3p subshell. C Element X has an oxidation number of +7 in most of its compounds. D When element X combines with element Y, the bonding is ionic.

Accepted Answer

A

Question 4

4 Which statement about the electrons in a ground state carbon atom is correct? A Electrons are present in four different energy levels. B There are more electrons in p orbitals than there are in s orbitals. C The occupied orbital of highest energy is spherical. D The occupied orbital of lowest energy is spherical.

Accepted Answer

D

Question 5

5 In this question you should assume the vapour behaves as an ideal gas. 0.175 g of a volatile liquid produces a vapour of volume 4.50 × 10–5 m3 at 100 °C and pressure of 1.013 × 105 Pa. What is the Mr of the liquid? A 31.9 B 87.1 C 119 D 127

Accepted Answer

C

Question 6

6 Which reaction is endothermic? A Ca(OH)2(aq)  +  2HCl (aq)  →  CaCl 2(aq)  +  2H2O(l) B 2Cl (g)  →  Cl 2(g) C 2Ca(s)  +  O2(g)  →  2CaO(s) D CaCO3(s)  →  CaO(s)  +  CO2(g)

Accepted Answer

D

Question 7

7 Which equation correctly represents the standard enthalpy change of atomisation of the given element? A 1 I2(g)  →  I(g) 2 B Na(s)  →  Na(g) C Cl 2(g)  →  2Cl (g) D Na(g)  →  Na+(g)  +  e–

Accepted Answer

B

Question 8

8 (NH4)2Cr2O7 decomposes when heated. (NH4)2Cr2O7  →  N2  +  4H2O  +  Cr2O3 Which element is oxidised and which element is reduced? oxidised reduced A chromium nitrogen B hydrogen chromium C nitrogen chromium D nitrogen hydrogen

Accepted Answer

C

Question 9

9 When lead(II) sulfide, PbS, is heated in air, sulfur dioxide and lead(II) oxide are formed. What is the equation for the reaction between PbS and oxygen? A PbS  +  2O2  →  SO2  +  PbO2 B PbS  +  2 2 1 O2  →  SO3  +  PbO2 C PbS  +  1 2 1 O2  →  SO2  +  PbO D PbS  +  2O2  →  SO3  +  PbO

Accepted Answer

C

Question 10

10 The decomposition of SO3(g) is a dynamic equilibrium. 2SO3(g) 2SO2(g)  +  O2(g) What happens when the pressure of the system is increased? A The rate of reaction will decrease and the position of the equilibrium will move to the left. B The rate of reaction will decrease and the position of the equilibrium will move to the right. C The rate of reaction will increase and the position of the equilibrium will move to the left. D The rate of reaction will increase and the position of the equilibrium will move to the right.

Accepted Answer

C

Question 11

11 Hydrated aluminium ions undergo the following reaction. [Al (H2O)6]3+(aq)  +  H2O(l) [Al (H2O)5OH]2+(aq)  +  H3O+(aq) Which statement about this reaction is correct? A H2O(l) and [Al (H2O)5OH]2+(aq) are a conjugate acid-base pair. B H2O(l) is acting as an acid as it is donating H+ ions. C If OH–(aq) is added, the equilibrium will move to the right. D Kc varies as the pH is varied.

Accepted Answer

C

Question 12

12 Which diagram correctly shows the electronegativity of the elements Na, Mg, Al and Si plotted against their first ionisation energies? A B Si Si Al Al electronegativity electronegativity Mg Mg Na Na first ionisation energy first ionisation energy C D Na Na Al Mg electronegativity electronegativity Mg Al Si Si first ionisation energy first ionisation energy

Accepted Answer

B

Question 13

13 Which statement about the compounds of Group 2 elements magnesium to barium is correct? A Carbonates of Group 2 elements produce bubbles when added to dilute nitric acid. B Nitrates of Group 2 elements produce nitrogen and oxygen on heating. C Oxides of Group 2 elements produce bubbles when added to dilute hydrochloric acid. D The oxides of Group 2 elements are amphoteric.

Accepted Answer

A

Question 14

14 When equal volumes of saturated solutions of barium hydroxide and calcium hydroxide are mixed, a white precipitate, Y, forms. The mixture is filtered and carbon dioxide is bubbled through the filtrate, producing a second white precipitate, Z. What are Y and Z? Y Z A Ba(OH)2 Ca(OH)2 B Ba(OH)2 CaCO3 C Ca(OH)2 BaCO3 D Ca(OH)2 Ba(OH)2

Accepted Answer

C

Question 15

15 Chlorate(V) ions, Cl O3 –, are produced in the redox reaction between chlorine and hot aqueous sodium hydroxide. Oxidation numbers can be used to help balance the equation for this reaction. vCl 2(g)  +  wOH–(aq)  →  xCl –(aq)  +  yCl O3 –(aq)  +  zH2O(l) What are the values of v, x and y in the balanced equation? v x y A 2 3 1 B 3 4 2 C 3 5 1 D 7 12 2

Accepted Answer

C

Question 16

16 The properties of chlorine, bromine and their compounds are compared. Which property is smaller for chlorine than for bromine? A bond strength of the hydrogen-halide bond B first ionisation energy C solubility of the silver halide in NH3(aq) D strength of the van der Waals’ forces between molecules of the element

Accepted Answer

D

Question 17

17 Solid sodium iodide reacts with concentrated sulfuric acid to form more than one product that contains sulfur. What is the lowest oxidation number of sulfur in these products? A –2 B 0 C +4 D +6

Accepted Answer

A

Question 18

18 Which emission from an internal combustion engine contributes to the erosion of marble statues? A carbon monoxide B nitrogen C nitrogen dioxide D unburnt hydrocarbons

Accepted Answer

C

Question 19

19 Ammonia, carbon dioxide and water react together to form ammonium carbonate. Which statement about this reaction is correct? A It is a redox reaction. B It is an acid-base reaction. C The H–N–H bond angle decreases as a consequence of this reaction. D The three substances react in a 1 : 1 : 1 ratio in this reaction.

Accepted Answer

B

Question 20

20 Structural isomerism and stereoisomerism should be considered when answering this question. How many isomers with the formula C5H10 have structures that involve π bonding? A 3 B 4 C 5 D 6

Accepted Answer

D

Question 21

21 The diagram shows the skeletal formula of phenazine. N N phenazine What is the empirical formula of phenazine? A C6H4N B C6H6N C C12H8N2 D C12H12N2

Accepted Answer

A

Question 22

22 An organic compound X reacts with hot, concentrated acidified potassium manganate(VII) solution to give a single carbon-containing product. What could be X? A CH2C(CH3)2 B CH3CHCHCH3 C CH2CHCH2CH3 D CH3CH2CH2CH3

Accepted Answer

B

Question 23

23 1-chloro-2-methylbutane reacts with sodium cyanide in ethanol in a nucleophilic substitution reaction. What is the most likely intermediate or transition state in this reaction? A B – – H H H3C CH2CH3 NC C Cl NC C Cl CH(CH3)CH2CH3 CH3 C D H3C CH2CH3 H H +C +C CH3 CH(CH3)CH2CH3

Accepted Answer

A

Question 24

24 Propan-1-ol can be reacted with acidified potassium dichromate(VI) to form propanoic acid, reaction 1, or propanal, reaction 2. O O reaction 1 reaction 2 CH3CH2COH CH3CH2CH2OH CH3CH2CH propan-1-ol How can the reaction be carried out to ensure that reaction 2 occurs rather than reaction 1? A An excess of acidified potassium dichromate(VI) is used. B An excess of concentrated sulfuric acid is added. C The reaction mixture is distilled immediately after mixing. D The reaction mixture is heated under reflux.

Accepted Answer

C

Question 25

25 What is the smallest amount of oxygen molecules needed for the complete combustion of 40.0 g of methanol? A 1.88 moles B 2.50 moles C 3.75 moles D 5.00 moles

Accepted Answer

A

Question 26

26 Compound X has stereoisomers and forms a precipitate when warmed with Fehling’s reagent. What could be the structure of compound X? A B C D O O O O

Accepted Answer

D

Question 27

27 The diagram shows the structure of Y. H H H H C C C C C H H O H O H Two suggestions are made about Y. 1 Y can be oxidised by hot, acidified dichromate(VI) ions. 2 One mole of Y gives one mole of tri-iodomethane when it reacts with an excess of alkaline aqueous iodine. Which suggestions are correct? A both 1 and 2 B 1 only C 2 only D neither 1 nor 2

Accepted Answer

D

Question 28

28 Esters can be prepared by the reaction of a carboxylic acid with an alcohol in the presence of concentrated sulfuric acid. Which row gives the correct names of the reagents that would be suitable to prepare ester Z? Z O O alcohol carboxylic acid A butan-1-ol methyl propanoic acid B propan-1-ol butanoic acid C propan-2-ol butanoic acid D propan-2-ol propanoic acid

Accepted Answer

C

Question 29

29 Compound Q can be hydrolysed by HCl (aq). The two products of this hydrolysis have the same empirical formula. What could Q be? A CH3CO2CH2CH2OH B CH3CO2CH2CH2CO2H C CH3CH2CO2CH2CH2CH3 D CH3CH2CH(OH)CH(OH)CH2CH3

Accepted Answer

B

Question 30

30 Substance T was analysed and found to contain 62.07% carbon, 10.34% hydrogen and 27.59% oxygen. The infra-red spectrum of substance T is shown. 100 transmittance / % 50 0 4000 3000 2000 1500 1000 500 wavenumber / cm–1 Which substance could be T? A B C D HO O O HO OH OH OH

Accepted Answer

A

Question 31

31 Which gaseous molecules are polar? 1 ammonia 2 hydrogen sulfide 3 boron trifluoride

Accepted Answer

B

Question 32

32 A carbon monoxide molecule, CO, has three bonds between the carbon atom and the oxygen atom. Which features are present in one CO molecule? 1 two lone pairs of electrons 2 a co-ordinate (dative covalent) bond from oxygen to carbon 3 two π bonds

Accepted Answer

A

Question 33

33 Carbon can exist as allotropes which include graphite, diamond and a fullerene. Which statements are correct? 1 All three allotropes contain covalent bonds. 2 All three allotropes are giant molecular. 3 All three allotropes have delocalised electrons.

Accepted Answer

D

Question 34

34 The reaction pathway diagram for a reversible reaction is shown. 50 energy / kJ mol–1 20 progress of reaction Which statements are correct? 1 The enthalpy change for the backward reaction is –20 kJ mol–1. 2 The forward reaction is endothermic. 3 The activation energy for the forward reaction is +70 kJ mol–1.

Accepted Answer

A

Question 35

35 Silicon forms a tetrachloride, SiCl 4. Which statements are correct? 1 In SiCl 4, the Si is δ+ and each Cl is δ–. 2 SiCl 4 is a liquid at room temperature. 3 SiCl 4 reacts with water to give an acidic solution and a precipitate.

Accepted Answer

A

Question 36

36 Which statements about ammonia are correct? 1 An ammonia molecule has three bond pairs and one lone pair of electrons. 2 When ammonia is bubbled into water the pH of the solution increases. 3 Ammonia gas can be made by warming ammonium sulfate with aqueous hydrochloric acid.

Accepted Answer

B

Question 37

37 Following fractional distillation of crude oil, which processes can be used to produce propene from larger hydrocarbon molecules? 1 cracking 2 reduction 3 polymerisation

Accepted Answer

D

Question 38

38 Bromoethane undergoes nucleophilic substitution reactions. Which statements are correct? 1 Bromoethane reacts with aqueous NaOH to make ethanol. 2 Bromoethane reacts with ethanolic NH3 to make ethylamine. 3 Bromoethane reacts with ethanolic KCN to make ethanenitrile.

Accepted Answer

B

Question 39

39 Which reagents, when used in excess, can convert Y into Z? CH3CH(OH)CO2H   →   CH3CH(OH)CO2Na Y Z 1 Na 2 Na2CO3 3 NaOH

Accepted Answer

C

Question 40

40 Each of the compounds below is treated separately with an excess of NaBH4. The product of each reaction is then heated with an excess of concentrated H2SO4. Which compounds give only one final product with the molecular formula C7H10? 1 2 3 O O O O H O H O H

Accepted Answer

C

Question paper16 pages

Mark scheme3 pages

Questions as text

Q1 · The diagram shows a Boltzmann distribution of the energies of gaseous molecules and the…

Q2 · In this question it should be assumed that (NH4)2CO3.H2O(s) dissolves in water without…

Q3 · The graph shows the successive ionisation energies of element X and element Y

Q4 · Which statement about the electrons in a ground state carbon atom is correct?

Q5 · In this question you should assume the vapour behaves as an ideal gas

Q6 · Which reaction is endothermic?

Q7 · Which equation correctly represents the standard enthalpy change of atomisation of the…

Q8 · (NH4)2Cr2O7 decomposes when heated

Q9 · When lead(II) sulfide, PbS, is heated in air, sulfur dioxide and lead(II) oxide are formed

Q10 · The decomposition of SO3(g) is a dynamic equilibrium

Q11 · Hydrated aluminium ions undergo the following reaction

Q12 · Which diagram correctly shows the electronegativity of the elements Na, Mg, Al and Si…

Q13 · Which statement about the compounds of Group 2 elements magnesium to barium is correct?

Q14 · When equal volumes of saturated solutions of barium hydroxide and calcium hydroxide are…

Q15 · Chlorate(V) ions, Cl O3 –, are produced in the redox reaction between chlorine and hot…

Q16 · The properties of chlorine, bromine and their compounds are compared

Q17 · Solid sodium iodide reacts with concentrated sulfuric acid to form more than one product…

Q18 · Which emission from an internal combustion engine contributes to the erosion of marble…

Q19 · Ammonia, carbon dioxide and water react together to form ammonium carbonate

Q20 · Structural isomerism and stereoisomerism should be considered when answering this question

Q21 · The diagram shows the skeletal formula of phenazine

Q22 · An organic compound X reacts with hot, concentrated acidified potassium manganate(VII)…

Q23 · 1-chloro-2-methylbutane reacts with sodium cyanide in ethanol in a nucleophilic…

Q24 · Propan-1-ol can be reacted with acidified potassium dichromate(VI) to form propanoic…

Q25 · What is the smallest amount of oxygen molecules needed for the complete combustion of…

Q26 · Compound X has stereoisomers and forms a precipitate when warmed with Fehling’s reagent

Q27 · The diagram shows the structure of Y

Q28 · Esters can be prepared by the reaction of a carboxylic acid with an alcohol in the…

Q29 · Compound Q can be hydrolysed by HCl (aq)

Q30 · Substance T was analysed and found to contain 62.07% carbon, 10.34% hydrogen and 27.59%…

Q31 · Which gaseous molecules are polar?

Q32 · A carbon monoxide molecule, CO, has three bonds between the carbon atom and the oxygen…

Q33 · Carbon can exist as allotropes which include graphite, diamond and a fullerene

Q34 · The reaction pathway diagram for a reversible reaction is shown

Q35 · Silicon forms a tetrachloride, SiCl 4

Q36 · Which statements about ammonia are correct?

Q37 · Following fractional distillation of crude oil, which processes can be used to produce…

Q38 · Bromoethane undergoes nucleophilic substitution reactions

Q39 · Which reagents, when used in excess, can convert Y into Z?

Q40 · Each of the compounds below is treated separately with an excess of NaBH4

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