Cambridge A Level Chemistry 9701 — 2020 May/June Paper 1 · Variant 3

Question 1

1 Which particle has equal numbers of protons and neutrons and an electronic structure of 1s22s22p63s23p6? A 39 Ar B 40 20Ca 2 + C 16 8O 2 − D 32 S 18 16

Accepted Answer

B

Question 2

2 Which molecule contains six bonding electrons? A NCl 3 B H2S C C2H4 D SF6

Accepted Answer

A

Question 3

3 Solid carbon dioxide, CO2, is similar to solid iodine, I2, in its structure. Which statement about solid CO2 and solid SiO2 is correct? A Both solid CO2 and solid SiO2 exist in a lattice structure. B Both solid CO2 and solid SiO2 have a simple molecular structure. C Both solid CO2 and solid SiO2 have atoms joined by single covalent bonds. D Both solid CO2 and solid SiO2 change spontaneously to gas at s.t.p..

Accepted Answer

A

Question 4

4 The enthalpy changes of two reactions are shown. K2CO3(s)  +  2HCl (aq)  →  2KCl (aq)  +  H2O(l)  +  CO2(g) ∆H = –34.0 kJ mol–1 KHCO3(s)  +  HCl (aq)  →  KCl (aq)  +  H2O(l)  +  CO2(g) ∆H = +32.8 kJ mol–1 What is the enthalpy change for the reaction shown? 2KHCO3(s)  →  K2CO3(s)  +  H2O(l)  +  CO2(g) A –31.6 kJ mol–1 B 1.2 kJ mol–1 C 66.8 kJ mol–1 D 99.6 kJ mol–1

Accepted Answer

D

Question 5

5 Nitrogen reacts with oxygen to form nitrogen monoxide, NO, and nitrogen dioxide, NO2. Nitrogen dioxide reacts with water and with hydroxide ions. N2(g)  +  O2(g)  →  2NO(g) 2NO(g)  +  O2(g)  →  2NO2(g) 2NO2(g)  +  H2O(l)  →  HNO2(aq)  +  H+(aq)  +  NO3 –(aq) 2NO2(g)  +  2OH–(aq)  →  NO2 –(aq)  +  NO3 –(aq)  +  H2O(l) What can be deduced using only the information from these equations? A HNO2 is a strong acid. B HNO3 is a weak acid. C NO2 is a neutral gas. D NO is a reducing agent.

Accepted Answer

D

Question 6

6 Which solution has the lowest pH value? A 0.01 mol dm–3 butanoic acid B 0.01 mol dm–3 ethanoic acid C 0.01 mol dm–3 hydrochloric acid D 0.01 mol dm–3 sulfuric acid

Accepted Answer

D

Question 7

7 The element sulfur produces a mass spectrum with the following peaks. m / e value relative of peak abundance 32 95.02 33 0.76 34 4.20 36 0.02 Which relative atomic mass of sulfur can be calculated from these data, given to four significant figures? A 32.07 B 32.08 C 32.09 D 32.10

Accepted Answer

C

Question 8

8 What is the electronic configuration of an isolated Ni2+ ion? A 1s22s22p63s23p63d64s2 B 1s22s22p63s23p63d74s1 C 1s22s22p63s23p63d104s2 D 1s22s22p63s23p63d8

Accepted Answer

D

Question 9

9 At 200 °C aluminium chloride is a gas with Mr = 267. What is the number of covalent bonds, dative covalent bonds and Ione pairs of electrons in one molecule of aluminium chloride at 200 °C? covalent dative Ione pairs bonds covalent bonds A 6 2 0 B 6 2 16 C 6 2 18 D 3 0 9

Accepted Answer

B

Question 10

10 When solid KCl O3 is heated in the absence of air, a mixture of two chlorine compounds in the mole ratio of 3 : 1 is formed. Chlorine is the only element whose oxidation number changes in this reaction. What could be the oxidation numbers of chlorine in the two compounds that are formed? A +3 and –1 B +6 and +4 C +7 and –1 D +7 and +1

Accepted Answer

C

Question 11

11 Two reactions are shown. reaction 1 X2(g)  +  Y2(g) 2XY(g) reaction 2 XY(g) 2 1 X2(g)  +  2 1 Y2(g) The equilibrium constant, Kp, for reaction 1 is 0.0052. What is Kp for reaction 2? A 2.6 × 10–3 B 13.9 C 192.3 D 384.6

Accepted Answer

B

Question 12

12 Compound T is a white crystalline solid. When a sample of compound T is mixed with aqueous sodium hydroxide and heated, a gas is produced which turns damp red litmus paper blue. Further testing of a solution of compound T with aqueous barium chloride produces a dense white precipitate which does not dissolve when dilute hydrochloric acid is added to the mixture. What is the identity of compound T? A ammonium carbonate B ammonium sulfate C sodium carbonate D sodium sulfate

Accepted Answer

B

Question 13

13 Which property explains the trend in volatility of the elements going down Group 17? A decreasing covalent bond strength B decreasing van der Waals’ forces C increasing covalent bond strength D increasing van der Waals’ forces

Accepted Answer

D

Question 14

14 The statements apply to the elements in Group 2. Which statement is correct? A As atomic number increases, ionic radius increases. B As atomic number increases, reducing ability decreases. C As atomic number increases, first ionisation energy increases. D As atomic radius increases, first ionisation energy increases.

Accepted Answer

A

Question 15

15 Which element, when burned in oxygen, can form an oxide that is a reducing agent? A Na B Mg C Al D S

Accepted Answer

D

Question 16

16 Nitrogen oxides are removed from the exhaust gases of internal combustion engines by the action of a catalyst in a catalytic converter. Which row is correct? change in oxidation type of catalyst number of nitrogen A decrease heterogeneous B decrease homogeneous C increase heterogeneous D increase homogeneous

Accepted Answer

A

Question 17

17 The addition of aqueous silver nitrate to aqueous barium chloride produces a white precipitate which dissolves in an excess of dilute aqueous ammonia to form a colourless solution. The addition of an excess of dilute nitric acid to the colourless solution produces a white precipitate, Z. What is Z? A AgCl B BaCl 2 C Ba(NO3)2 D NH4NO3

Accepted Answer

A

Question 18

18 Which property shows an increase from calcium to barium going down Group 2? A the ease of decomposition of the carbonates B the solubility of the hydroxides C the solubility of the sulfates D the volume of hydrogen given off when 1 g of the metal reacts with water

Accepted Answer

B

Question 19

19 Element X is in Period 3. It reacts rapidly with water to form an alkaline solution. Which statement about the chloride of element X is correct? A It conducts electricity when molten. B It has a melting point of less than 100 °C. C It has covalent bonding. D It reacts rapidly with cold water.

Accepted Answer

A

Question 20

20 Structural and stereoisomerism should be considered when answering this question. When trans-pent-2-ene reacts with HBr, how many different products can form? A 1 B 2 C 3 D 4

Accepted Answer

C

Question 21

21 Ester P has the following structural formula. ester P O CH3C OCH2CH2CH(CH3)2 Which compounds are produced when P is hydrolysed using dilute hydrochloric acid? A CH3COCl  and  (CH3)2CHCH2CH2OH B CH3CH2OH  and  (CH3)2CHCH2CO2H C CH3CO2H  and  (CH3)2CHCH2CO2H D CH3CO2H  and  (CH3)2CHCH2CH2OH

Accepted Answer

D

Question 22

22 There are many non-cyclic alcohols that cannot be oxidised by warm acidified MnO4 – ions. Alcohol X is the member of this set of alcohols with the lowest molecular mass. How many moles of oxygen are required for the complete combustion of 1.0 mol of alcohol X? A 3.5 mol B 4.5 mol C 6.0 mol D 6.5 mol

Accepted Answer

C

Question 23

23 Butanoic acid can be produced from 1-bromopropane in two steps using reagents V and W as shown. reagent V reagent W 1-bromopropane compound Q butanoic acid What could be reagents V and W? V W A KCN in ethanol HCl (aq) B KCN in ethanol NaOH(aq) C NH3 in ethanol HCl (aq) D NaOH(aq) H+ / Cr2O7 2–(aq)

Accepted Answer

A

Question 24

24 Which statement about compound T and compound U is correct? compound T compound U O O H3C C H C CH2CH2CH3 CH(CH3)CH2CH3 A T and U are stereoisomers. B T can be distinguished from U by the use of alkaline aqueous iodine. C T can be reduced by LiAl H4 but not by NaBH4. D U can be formed by the oxidation of 3-methylbutan-1-ol.

Accepted Answer

B

Question 25

25 The diagram shows the infrared spectrum of an organic compound. What could be the identity of this compound? A propan-1-ol B propanal C propanoic acid D propanone

Accepted Answer

C

Question 26

26 Which reagent reacts with both of the –OH groups in lactic acid, CH3CH(OH)CO2H? A acidified potassium dichromate(VI) B ethanol C sodium D sodium hydroxide

Accepted Answer

C

Question 27

27 1,2-dibromopropane can be made from 1-bromopropane in two steps. Which row is correct? step 1 step 2 A addition substitution B elimination addition C hydrolysis elimination D substitution hydrolysis

Accepted Answer

B

Question 28

28 2-methylbut-2-ene reacts with HBr(g) to form two isomeric products. During the reaction two positively charged intermediates can be made. Which diagram shows the more stable of the two positively charged intermediates? A B C D Br + Br + + +

Accepted Answer

A

Question 29

29 The ester ethyl methanoate is prepared in a school laboratory by reacting a carboxylic acid with an alcohol. During the reaction, only 50.0% of the alcohol is converted into the ester. Which mass of alcohol is needed to prepare 10.0 g of the ester? A 3.11 g B 8.65 g C 12.4 g D 32.2 g

Accepted Answer

C

Question 30

30 Compound X has the structure shown. compound X O Which type of carbonyl group is present and how many chiral centres are there in one molecule of X? carbonyl chiral group centres A aldehyde 0 B aldehyde 1 C ketone 0 D ketone 1

Accepted Answer

D

Question 31

31 Which contain one mole of the underlined substance under room conditions? 1 a balloon containing 24.0 dm3 of helium 2 a block of calcium carbonate weighing 100.1 g 3 4000 cm3 of a 0.250 mol dm–3 solution of sulfuric acid

Accepted Answer

A

Question 32

32 Buckminsterfullerene is a fullerene allotrope of carbon. Which statements about buckminsterfullerene are correct? 1 Buckminsterfullerene is a giant covalent molecule. 2 Buckminsterfullerene has delocalised electrons. 3 Buckminsterfullerene has strong intramolecular bonds.

Accepted Answer

C

Question 33

33 Gaseous sodium ions can be formed from sodium atoms. Na(s)  →  Na+(g) Which quantities are required to calculate the enthalpy change of formation of Na+(g)? 1 first ionisation energy of sodium 2 enthalpy change of atomisation of sodium 3 enthalpy change of formation of sodium

Accepted Answer

B

Question 34

34 The Haber process is used in industry to form ammonia from hydrogen and nitrogen. 3H2  +  N2 2NH3 Which statements about the activation energy for this process are correct? 1 The activation energy for the forward reaction is the same as the activation energy for the reverse reaction. 2 The activation energy for the reverse reaction is decreased by the addition of iron. 3 The activation energy is the minimum energy that colliding particles must possess in order to react.

Accepted Answer

C

Question 35

35 Strontium nitrate is heated strongly for several minutes. Which statements are correct? 1 A brown gas is produced. 2 A gas is produced that relights a glowing splint. 3 A white powder remains after heating.

Accepted Answer

A

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 Propanal reacts 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 this catalysed reaction of propanal with hydrogen cyanide are correct? 1 The sodium cyanide provides a stronger nucleophile than HCN. 2 The reaction can be classified as nucleophilic substitution. 3 The hydrogen cyanide molecule attacks the propanal molecule to form an intermediate ion.

Accepted Answer

D

Question 38

38 A reaction mechanism is shown. CH2 CH2 H2C CH2 H2C CH2 + Cl – H2C C Cl H2C C H H OH HO– Which statements about this reaction are correct? 1 It is a substitution reaction. 2 OH– behaves as a nucleophile. 3 Heterolytic bond fission is involved.

Accepted Answer

A

Question 39

39 On complete combustion, a sample of X produces 44 g of carbon dioxide and 27 g of water. On complete combustion, a sample of Y produces 44 g of carbon dioxide and 18 g of water. On complete combustion, a sample of Z produces 22 g of carbon dioxide and 9 g of water. Which substances could be straight chain alkanes? 1 X 2 Y 3 Z

Accepted Answer

D

Question 40

40 Which pairs are structural isomers of each other? 1 CH3CH2CH2CH2CH2CO2H  and  CH3CH2CH2CO2CH2CH3 2 and 3 CH3CH2CH2CH(OH)CH2CH3  and  CH3CH2CH(OH)CH2CH2CH3

Accepted Answer

B

Question paper16 pages

Mark scheme3 pages

Questions as text

Q1 · Which particle has equal numbers of protons and neutrons and an electronic structure of…

Q2 · Which molecule contains six bonding electrons?

Q3 · Solid carbon dioxide, CO2, is similar to solid iodine, I2, in its structure

Q4 · The enthalpy changes of two reactions are shown

Q5 · Nitrogen reacts with oxygen to form nitrogen monoxide, NO, and nitrogen dioxide, NO2

Q6 · Which solution has the lowest pH value?

Q7 · The element sulfur produces a mass spectrum with the following peaks

Q8 · What is the electronic configuration of an isolated Ni2+ ion?

Q9 · At 200 °C aluminium chloride is a gas with Mr = 267

Q10 · When solid KCl O3 is heated in the absence of air, a mixture of two chlorine compounds in…

Q11 · Two reactions are shown

Q12 · Compound T is a white crystalline solid

Q13 · Which property explains the trend in volatility of the elements going down Group 17?

Q14 · The statements apply to the elements in Group 2

Q15 · Which element, when burned in oxygen, can form an oxide that is a reducing agent?

Q16 · Nitrogen oxides are removed from the exhaust gases of internal combustion engines by the…

Q17 · The addition of aqueous silver nitrate to aqueous barium chloride produces a white…

Q18 · Which property shows an increase from calcium to barium going down Group 2?

Q19 · Element X is in Period 3

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

Q21 · Ester P has the following structural formula

Q22 · There are many non-cyclic alcohols that cannot be oxidised by warm acidified MnO4 – ions

Q23 · Butanoic acid can be produced from 1-bromopropane in two steps using reagents V and W as…

Q24 · Which statement about compound T and compound U is correct?

Q25 · The diagram shows the infrared spectrum of an organic compound

Q26 · Which reagent reacts with both of the –OH groups in lactic acid, CH3CH(OH)CO2H?

Q27 · 1,2-dibromopropane can be made from 1-bromopropane in two steps

Q28 · 2-methylbut-2-ene reacts with HBr(g) to form two isomeric products

Q29 · The ester ethyl methanoate is prepared in a school laboratory by reacting a carboxylic…

Q30 · Compound X has the structure shown

Q31 · Which contain one mole of the underlined substance under room conditions?

Q32 · Buckminsterfullerene is a fullerene allotrope of carbon

Q33 · Gaseous sodium ions can be formed from sodium atoms

Q34 · The Haber process is used in industry to form ammonia from hydrogen and nitrogen

Q35 · Strontium nitrate is heated strongly for several minutes

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

Q37 · Propanal reacts with hydrogen cyanide to form 2-hydroxybutanenitrile

Q38 · A reaction mechanism is shown

Q39 · On complete combustion, a sample of X produces 44 g of carbon dioxide and 27 g of water

Q40 · Which pairs are structural isomers of each other?

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