Cambridge A Level Chemistry 9701 — 2019 May/June Paper 1 · Variant 1

Question 1

1 The temperature of a sample of an inert gas is increased. What effect does this have on the number of molecules with the most probable energy and on the number of molecules with high energy? number of molecules with number of molecules the most probable energy with high energy A decreases decreases B decreases increases C increases decreases D increases increases

Accepted Answer

B

Question 2

2 A sample of element X is analysed using mass spectrometry. The mass spectrum obtained is shown. 56% 41% % abundance 3% 112 113 114 115 116 m / e What is the relative atomic mass of this sample of element X? A 113.7 B 114.0 C 114.2 D 114.4

Accepted Answer

D

Question 3

3 A washing powder contains sodium hydrogencarbonate, NaHCO3, as one of the ingredients. In a titration, a solution containing 1.00 g of this washing powder requires 7.15 cm3 of 0.100 mol dm–3 sulfuric acid for complete reaction. The sodium hydrogencarbonate is the only ingredient that reacts with the acid. What is the percentage by mass of sodium hydrogencarbonate in the washing powder? A 3.0% B 6.0% C 12.0% D 24.0%

Accepted Answer

C

Question 4

4 The outermost electron in an atom of neon occupies a particular orbital. Which row shows the relative energy and shape of this orbital? energy of orbital relative shape of orbital to other occupied orbitals A higher or equal B higher or equal C lower or equal D lower or equal

Accepted Answer

A

Question 5

5 In which species is there a lone pair of electrons? A CH3 B CH3 + C CH3 – D CH4

Accepted Answer

C

Question 6

6 When an evacuated tube of volume 400 cm3 is filled with gas at 300 K and 101 kPa, the mass of the tube increases by 0.65 g. Assume the gas behaves as an ideal gas. What could be the identity of the gas? A argon B helium C krypton D neon

Accepted Answer

A

Question 7

7 Under which conditions will nitrogen behave most like an ideal gas? temperature pressure A low high B high low C low low D high high

Accepted Answer

B

Question 8

8 Two reactions and their enthalpy changes are shown. 2C(s)  +  2H2(g)  →  C2H4(g) ∆H o = +52.2 kJ mol–1 C2H2(g)  +  H2(g)  →  C2H4(g) ∆H o = –175.8 kJ mol–1 These data can be used to calculate the enthalpy change for the reaction shown. 2C(s)  +  H2(g)  →  C2H2(g) ∆H o = X What is the value of X? A –228.0 kJ mol–1 B –123.6 kJ mol–1 C +123.6 kJ mol–1 D +228.0 kJ mol–1

Accepted Answer

D

Question 9

9 Ethanedioic acid, HO2CCO2H, can be oxidised by KMnO4 in dilute sulfuric acid. The products of this reaction are carbon dioxide, water, potassium sulfate and manganese(II) sulfate. In this reaction each ethanedioic acid molecule loses two electrons as it is oxidised. A half-equation for this process is shown. HO2CCO2H  →  2CO2  +  2H+  +  2e– How many water molecules are produced when five ethanedioic acid molecules are oxidised by KMnO4 in dilute sulfuric acid? A 5 B 8 C 10 D 16

Accepted Answer

B

Question 10

10 Hydrogen iodide gas decomposes reversibly producing iodine vapour and hydrogen. 2HI(g) I2(g)  +  H2(g) ∆H = +12 kJ mol–1 The position of the equilibrium for this reaction may be altered by changing the external conditions. Which row correctly describes the change in position of equilibrium? effect of increasing effect of increasing the pressure the temperature A moves to the right moves to the right B moves to the right moves to the left C no change moves to the right D no change moves to the left

Accepted Answer

C

Question 11

11 The reaction between sulfur dioxide and oxygen is reversible. 2SO2(g)  +  O2(g) 2SO3(g) Kc = 280 mol–1 dm3 at 1000 K In an equilibrium mixture at 1000 K the sulfur trioxide concentration is 6.00 mol dm–3. The sulfur dioxide concentration is twice the oxygen concentration. What is the sulfur dioxide concentration? A 0.175 mol dm–3 B 0.254 mol dm–3 C 0.318 mol dm–3 D 0.636 mol dm–3

Accepted Answer

D

Question 12

12 1.15 g of a metallic element needs 300 cm3 of oxygen for complete reaction, under room conditions, to form an oxide which contains O2– ions. What could be the identity of this metallic element? A calcium B magnesium C potassium D sodium

Accepted Answer

D

Question 13

13 The relative melting points of four consecutive elements in the Periodic Table are shown in the graph. The elements all have proton numbers less than 20. Which element is in Group 16? A melting point / K B C 273 D proton number

Accepted Answer

C

Question 14

14 Substance X reacts with water. A gas is given off and the pH of the solution increases. The solution is then reacted with sulfuric acid and a white precipitate forms. What could be substance X? A barium B barium oxide C magnesium D magnesium oxide

Accepted Answer

A

Question 15

15 Solutions of 0.1 mol dm–3 Mg(NO3)2 and 0.1 mol dm–3 Ba(NO3)2 separately undergo a series of reactions using pure reagents. sodium carbonate excess HCl (aq) excess solution then boil NaOH(aq) Mg(NO3)2(aq) M N P sodium carbonate excess HCl (aq) excess solution then boil NaOH(aq) Ba(NO3)2(aq) Q R S M, N and P are magnesium compounds. Q, R and S are barium compounds. How many of M, N, P, Q, R and S are white precipitates? A 2 B 3 C 4 D 5

Accepted Answer

B

Question 16

16 Concentrated sulfuric acid is added to separate solid samples of sodium chloride, sodium bromide and sodium iodide. With which samples does sulfuric acid act as an oxidising agent? A sodium chloride only B sodium chloride and sodium bromide C sodium bromide and sodium iodide D sodium iodide only

Accepted Answer

C

Question 17

17 The reaction of bromine with warm NaOH(aq) produces products with the same oxidation numbers, in the same ratios, as the reaction of chlorine with hot NaOH(aq). In one reaction between bromine and warm NaOH(aq), 30.2 g of a product containing sodium, bromine and oxygen is produced. Which mass of NaOH has reacted? A 8.00 g B 10.2 g C 20.3 g D 48.0 g

Accepted Answer

D

Question 18

18 At 550 °C nitrogen dioxide reacts with unburnt hydrocarbon fragments such as CH3 in the catalytic converter of a motor vehicle. 4CH3  +  7NO2  →  3 1 N   +  4CO2  +  6H2O 2 2 Which row gives the energy change for this reaction and a possible reason for it? energy change reason why the reaction is endothermic of reaction or exothermic A endothermic chemical energy is converted to heat energy B endothermic the N≡N bond energy is very high C exothermic CO2 and H2O have negative         values D exothermic double bonds are broken in NO2

Accepted Answer

C

Question 19

19 Which statement is correct? A Ammonia reacts with alkalis to form the ammonium ion. B Ammonium chloride contains ionic, covalent and co-ordinate bonds. C The ammonium ion reacts with acids to produce ammonia. D The bond angle in the ammonium ion is approximately 107°.

Accepted Answer

B

Question 20

20 The diagrams show two different compounds. O O 1 2 What is ● the total number of structural isomers, including compound 2, that could be formed by adding a second methyl group to the ring of compound 1, ● the number of π electrons in each compound? number of number of isomers π electrons A 3 2 B 3 4 C 5 2 D 5 4

Accepted Answer

D

Question 21

21 Which compound has the molecular formula C6H10O? A B C D O O O OH

Accepted Answer

A

Question 22

22 What is the structural formula of the major product when hydrogen bromide reacts with 2-methylbut-2-ene? A CH2BrCH(CH3)CH2CH3 B (CH3)2CBrCH2CH3 C (CH3)2CHCHBrCH3 D (CH3)2CHCH2CH2Br

Accepted Answer

B

Question 23

23 Which reaction is most likely to involve the formation of a positively charged intermediate? A 1-bromopentane and warm dilute NaOH(aq) B 1-bromo-2,2-dimethylpropane and warm dilute NaOH(aq) C 1-bromo-3-methylbutane and warm dilute NaOH(aq) D 2-bromo-2-methylbutane and warm dilute NaOH(aq)

Accepted Answer

D

Question 24

24 The infra-red spectrum of a substance with empirical formula C2H4O is shown. 100 transmittance 50 X Y 0 4000 3000 2000 1500 1000 500 wavenumber / cm–1 Which bonds are responsible for peak X and peak Y? peak X peak Y A C–H C=C B C–H C=O C O–H C=C D O–H C=O

Accepted Answer

B

Question 25

25 The structure of coniine is shown. coniine N CH2CH2CH3 H Coniine can be synthesised by reacting ammonia with a dibromo compound, X. NH3 + C8H16Br2 → coniine + 2HBr X What is the name of compound X? A 1,1-dibromo-2-propylcyclopentane B 1,2-dibromo-2-propylcyclopentane C 1,4-dibromooctane D 1,5-dibromooctane

Accepted Answer

D

Question 26

26 Structural isomerism and stereoisomerism should be considered when answering this question. 3-methylhexan-3-ol reacts with hot, concentrated sulfuric acid to form several isomeric compounds with the molecular formula C7H14. 3-methylhexan-3-ol HO How many isomeric compounds could be formed in this reaction? A 3 B 4 C 5 D 6

Accepted Answer

C

Question 27

27 An organic compound T undergoes the following reactions. ● T is oxidised by hot, acidified potassium manganate(VII). ● T reacts with sodium to give hydrogen. What could be compound T? A CH3CH2CH(OH)CH3 B CH3CH2CH2CHO C (CH3)3COH D CH3CH2COCH3

Accepted Answer

A

Question 28

28 Compound X is treated with two reagents successively, forming compound Z. X CHO a mild oxidising agent NaBH4 Y Z COCH3 What could be Z? A B C D CO2H CH2OH CH2OH CO2H CH(OH)CH3 CH(OH)CH3 CH(OH)CH3 CH(OH)CH3

Accepted Answer

A

Question 29

29 Which reagent may be used to distinguish between propanone and ethanol? A 2,4-dinitrophenylhydrazine B bromine water C Fehling’s reagent D Tollens’ reagent

Accepted Answer

A

Question 30

30 Which compound is chiral? A 1-chloro-3-methylbutane B 2-chloro-2-methylbutane C 2-chloro-3-methylbutane D 3-chloropentane Section B

Accepted Answer

C

Question 31

31 An atom of calcium-48 can form a 2+ ion. Which statements about this ion are correct? 1 It has 20 protons. 2 It has 28 neutrons. 3 It has 22 electrons.

Accepted Answer

B

Question 32

32 Four elements, W, X, Y and Z, have electronic configurations as shown. W X Y Z 2,4 2,6 2,8,2 2,8,8,1 Which formulae represent compounds that have boiling points below room temperature? 1 WX2 2 YX 3 Z2X

Accepted Answer

D

Question 33

33 Which statements about enthalpy changes are correct? 1 The enthalpy change of atomisation is always positive. 2 The enthalpy change when a C–C bond is broken is positive. 3 The enthalpy change of neutralisation of a weak acid is always negative.

Accepted Answer

A

Question 34

34 Vanadium and pepsin can both act as catalysts. Vanadium is a metal. Pepsin is an enzyme. Which statements are correct for both vanadium and pepsin? 1 They will speed up any chemical reaction. 2 They can lower the activation energy for a reaction. 3 They are not used up when they act as catalysts.

Accepted Answer

C

Question 35

35 Which oxides, when placed in cold water for one day, will react with the water? 1 MgO 2 Al 2O3 3 SiO2

Accepted Answer

D

Question 36

36 A mixture of magnesium carbonate and magnesium nitrate is heated strongly in a hard-glass test-tube. Which gases are formed? 1 carbon dioxide 2 nitrogen dioxide 3 oxygen

Accepted Answer

A

Question 37

37 Which statements about poly(alkene)s are correct? 1 Poly(alkene)s do not react with Br2(aq) in the dark. 2 Disposal of poly(alkene)s by combustion can produce harmful products. 3 Poly(alkene)s do not readily biodegrade.

Accepted Answer

A

Question 38

38 Compound Y ● reacts with alkaline aqueous iodine to form a yellow precipitate ● changes the colour of warm, acidified potassium dichromate(VI) solution. What could be compound Y? OH 1 O 2 H 3 O

Accepted Answer

B

Question 39

39 Carboxylic acids can be made by several different reactions. Which statements are correct? 1 The acid hydrolysis of CH3CH2CN will make ethanoic acid. 2 The oxidation of CH3CH2CH2CH2OH will make butanoic acid. 3 The oxidation of CH3CH2CHO will make propanoic acid.

Accepted Answer

C

Question 40

40 Carboxylic acids react with alcohols to produce esters. Carboxylic acid X forms one ester only with molecular formula C5H10O2. What could X be? 1 ethanoic acid 2 propanoic acid 3 butanoic acid

Accepted Answer

C

Question paper16 pages

Mark scheme3 pages

Questions as text

Q1 · The temperature of a sample of an inert gas is increased

Q2 · A sample of element X is analysed using mass spectrometry

Q3 · A washing powder contains sodium hydrogencarbonate, NaHCO3, as one of the ingredients

Q4 · The outermost electron in an atom of neon occupies a particular orbital

Q5 · In which species is there a lone pair of electrons?

Q6 · When an evacuated tube of volume 400 cm3 is filled with gas at 300 K and 101 kPa, the…

Q7 · Under which conditions will nitrogen behave most like an ideal gas?

Q8 · Two reactions and their enthalpy changes are shown

Q9 · Ethanedioic acid, HO2CCO2H, can be oxidised by KMnO4 in dilute sulfuric acid

Q10 · Hydrogen iodide gas decomposes reversibly producing iodine vapour and hydrogen

Q11 · The reaction between sulfur dioxide and oxygen is reversible

Q12 · 1.15 g of a metallic element needs 300 cm3 of oxygen for complete reaction, under room…

Q13 · The relative melting points of four consecutive elements in the Periodic Table are shown…

Q14 · Substance X reacts with water

Q15 · Solutions of 0.1 mol dm–3 Mg(NO3)2 and 0.1 mol dm–3 Ba(NO3)2 separately undergo a series…

Q16 · Concentrated sulfuric acid is added to separate solid samples of sodium chloride, sodium…

Q17 · The reaction of bromine with warm NaOH(aq) produces products with the same oxidation…

Q18 · At 550 °C nitrogen dioxide reacts with unburnt hydrocarbon fragments such as CH3 in the…

Q19 · Which statement is correct?

Q20 · The diagrams show two different compounds

Q21 · Which compound has the molecular formula C6H10O?

Q22 · What is the structural formula of the major product when hydrogen bromide reacts with…

Q23 · Which reaction is most likely to involve the formation of a positively charged…

Q24 · The infra-red spectrum of a substance with empirical formula C2H4O is shown

Q25 · The structure of coniine is shown

Q26 · Structural isomerism and stereoisomerism should be considered when answering this question

Q27 · An organic compound T undergoes the following reactions

Q28 · Compound X is treated with two reagents successively, forming compound Z

Q29 · Which reagent may be used to distinguish between propanone and ethanol?

Q30 · Which compound is chiral?

Q31 · An atom of calcium-48 can form a 2+ ion

Q32 · Four elements, W, X, Y and Z, have electronic configurations as shown

Q33 · Which statements about enthalpy changes are correct?

Q34 · Vanadium and pepsin can both act as catalysts

Q35 · Which oxides, when placed in cold water for one day, will react with the water?

Q36 · A mixture of magnesium carbonate and magnesium nitrate is heated strongly in a hard-glass…

Q37 · Which statements about poly(alkene)s are correct?

Q38 · Compound Y ● reacts with alkaline aqueous iodine to form a yellow precipitate ● changes…

Q39 · Carboxylic acids can be made by several different reactions

Q40 · Carboxylic acids react with alcohols to produce esters

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