Cambridge A Level Chemistry 9701 — 2023 Feb/March Paper 1 · Variant 2

Question 1

1 Four equations representing reactions of nitrogen or one of its compounds are given. Which equation represents a disproportionation reaction? A 2HNO3 + CaCO3 →Ca(NO3)2 + CO2 + H2O B N2 + 3H2 →2NH3 C NH4Cl + NaOH →NH3 + NaCl + H2O D 2NO2 + H2O →HNO3 + HNO2

Accepted Answer

D

Question 2

2 The diagram shows the Boltzmann distribution for one mole of a gas. The gas takes part in a reaction with an activation energy, Ea. P number of particles with energy, E 0 0 Ea energy, E Which statement correctly describes the effect of an increase in temperature? A Peak P will be higher and fewer molecules will have energy > Ea. B Peak P will be higher and more molecules will have energy > Ea. C Peak P will be lower and fewer molecules will have energy > Ea. D Peak P will be lower and more molecules will have energy > Ea.

Accepted Answer

D

Question 3

3 A student carries out four experiments to investigate the rate of reaction between 3.0g of calciumcarbonate and hydrochloric acid. CaCO3(s) + 2HCl(aq) →CaCl 2(aq) + CO2(g) + H2O(l) CaCO3 powder + 2.0moldm–3 HCl at 35°C experiment 1 CaCO3 powder + 2.0moldm–3 HCl at 35°C experiment 2 large chips of CaCO3 + 1.0moldm–3 HCl at room temperature experiment 3 large chips of CaCO3 + 1.0moldm–3 HCl at 35°C experiment 4 The student collects the CO2(g) and times how long it takes to produce the same volume of gas for each experiment. What could be the correct times for the four experiments? experiment 1 experiment 2 experiment 3 experiment 4 /s /s /s /s A 5 10 30 95 B 5 10 95 30 C 5 30 95 10 D 95 30 10 5

Accepted Answer

B

Question 4

4 The table shows the partial pressures in an equilibrium mixture formed by the Haber process. 3H2(g) + N2(g) ⇌2NH3(g) substance partial pressure/kPa nitrogen 7000 hydrogen 8000 ammonia 4000 What is the numerical value of the equilibrium constant, Kp, for this reaction? A 4.46 × 10–9 B 4.76 × 10–5 C 7.14 × 10–5 D 2.24 × 108

Accepted Answer

A

Question 5

5 A reversible reaction is shown. 2NOCl(g) ⇌2NO(g) + Cl 2(g) ∆H = +77.0 kJ mol–1 Which change in conditions will move the position of equilibrium to the right and increase the value of the equilibrium constant? A a decrease in pressure B a decrease in temperature C an increase in pressure D an increase in temperature

Accepted Answer

D

Question 6

6 The ore psilomelane may be considered to have the general formula Ba(Mnx+)(Mny+)8O16(OH)4. In this general formula, x+ and y+ are the two different oxidation states of manganese in psilomelane. What could be the values of x and y? x y A 2 4 B 6 4 C 6 3 D 7 3

Accepted Answer

A

Question 7

7 Silicon reacts with a mixture of calcium oxide and magnesium oxide at 1200 °C. 2MgO + 2CaO + Si →2Mg + Ca2SiO4 Which statement about this reaction is correct? A Calcium is reduced and silicon is neither oxidised nor reduced. B Magnesium is reduced and calcium is neither oxidised nor reduced. C Magnesium is reduced and silicon is neither oxidised nor reduced. D Silicon is reduced and calcium is neither oxidised nor reduced.

Accepted Answer

B

Question 8

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

Accepted Answer

C

Question 9

9 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 10

10 The equation for a chemical reaction is shown. All substances are in their standard states. XeF6 + 3H2O →XeO3 + 6HF Which statement describes the standard enthalpy change of reaction for this reaction? A the enthalpy change when a total of one mole of products is produced B the enthalpy change when a total of one mole of reactants is reacted C the enthalpy change when one mole of water reacts D the enthalpy change when six moles of hydrogen fluoride are produced

Accepted Answer

D

Question 11

11 Molten aluminium chloride has a simple molecular structure. Each molecule consists of two aluminium atoms and six chlorine atoms. Which statement is correct? A All the chlorine atoms in 1g of molten aluminium chloride have the same mass. B One mole of molten aluminium chloride contains 6.02 × 1023 aluminium atoms. C One mole of molten aluminium chloride contains 3.61 × 1024 chlorine atoms. D The empirical formula of molten aluminium chloride is Al 2Cl 6.

Accepted Answer

C

Question 12

12 Which atom contains four times as many neutrons as the atom? A B C D

Accepted Answer

C

Question 13

13 Which statement about the first ionisation energies of magnesium and neon is correct? A Magnesium has the greater numerical value and both are endothermic. B Magnesium has the greater numerical value and both are exothermic. C Neon has the greater numerical value and both are endothermic. D Neon has the greater numerical value and both are exothermic.

Accepted Answer

C

Question 14

14 In a sample of pure water, what is the maximum number of hydrogen bonds that one molecule of water can be involved in? A 1 B 2 C 3 D 4

Accepted Answer

D

Question 15

15 Hydrated cobalt(II) sulfate loses water when heated to give anhydrous cobalt(II) sulfate. All the water of crystallisation is lost to the atmosphere as steam. When 3.10 g of hydrated cobalt(II) sulfate, CoSO4•xH2O, is heated to constant mass the loss in mass is 1.39 g. What is the value of x, to the nearest whole number? A 4 B 6 C 7 D 11

Accepted Answer

C

Question 16

16 The table shows bond energies for some diatomic molecules. Deuterium, D, is an isotope of hydrogen. energy bond /kJmol–1 F–F 158 Cl–Cl 242 Br–Br 193 I–I 151 H–H 436 D–D 442 Which statements are correct? 1 Diatomic molecules have exact values for their bond energies, which are always positive. 2 The trend in Group 7 bond energies can be explained by the variation in instantaneous dipole–induced dipole (id–id) forces. 3 A value for the enthalpy change for the reaction between deuterium and chlorine can be calculated using these data alone. A 1 only B 1 and 2 only C 1 and 3 only D 2 and 3 only

Accepted Answer

A

Question 17

17 Two procedures are described. 1 Sulfur is burned in an excess of oxygen and then NO is added to the product mixture. 2 Sulfur is burned in an excess of oxygen and then NO2 is added to the product mixture. Which procedures will produce some sulfur trioxide, SO3? A both 1 and 2 B 1 only C 2 only D neither 1 nor 2

Accepted Answer

A

Question 18

18 Powder P is a mixture containing two of AgCl, AgBr or AgI. P is shaken with dilute aqueous ammonia. A yellow solid, Q, remains. The mixture is filtered and Q is washed and dried. The filtrate is collected and treated with aqueous nitric acid to produce a white precipitate, R, which is filtered off, washed and dried. Q and R are warmed separately with concentrated sulfuric acid, H2SO4. Which observations are made? Q + concentrated H2SO4 R + concentrated H2SO4 A violet fumes orange fumes B violet fumes steamy fumes C steamy fumes violet fumes D orange fumes steamy fumes

Accepted Answer

B

Question 19

19 Two Period 3 elements, X and Y, burn separately in oxygen to form solid oxides. The oxide of X is insoluble in water. The oxide of Y dissolves in water to form a solution which dissolves the oxide of X. What could X and Y be? X Y A aluminium sodium B magnesium sodium C silicon phosphorus D silicon sulfur

Accepted Answer

A

Question 20

20 Which row describes the structure and bonding of SiO2 and SiCl 4? SiO2 SiCl 4 structure bonding structure bonding A giant covalent giant covalent B giant covalent simple covalent C giant ionic giant covalent D giant ionic simple covalent

Accepted Answer

B

Question 21

21 A sample containing 0.010mol of anhydrous calcium nitrate is heated strongly until it fully decomposes. All the gas produced is collected and its volume measured at room conditions. What is the volume of gas produced? A 120cm3 B 600cm3 C 720cm3 D 840cm3

Accepted Answer

B

Question 22

22 V and Z are both elements in Period 3 of the Periodic Table. Each element forms one stable ion that does not contain another element. The atomic radius of each element and the ionic radius of the ion described above is shown. atomic radius ionic radius element /nm /nm V 0.186 0.095 Z 0.099 0.181 Which statement is correct? A Ions of V and Z have the same number of full electron shells. B Ions of Z are positively charged. C Z has a greater electronegativity than V. D V has more outer electrons than Z.

Accepted Answer

C

Question 23

23 In Group 2 of the Periodic Table, the properties of the elements and their compounds show regular change down the group. Which property shows a decrease from magnesium to barium? A the decomposition temperature of the carbonates B the decomposition temperature of the nitrates C the solubility of the hydroxides D the solubility of the sulfates

Accepted Answer

D

Question 24

24 Four properties of beryllium, Be, or a beryllium compound are listed. Which property is different from the property of magnesium or the equivalent magnesium compound? A Be reacts with O2 when heated in air; Mg does not. B Be reacts with aqueous H2SO4 to form a metal sulfate and H2; Mg does not. C Be(NO3)2 decomposes on heating to form a metal oxide, NO2 and O2; Mg(NO3)2 does not. D BeCl 2 reacts with water to form fumes of HCl; MgCl 2 does not.

Accepted Answer

D

Question 25

25 Which two formulae correctly represent a pair of structural isomers? A CH3CH(CH3)COOH and (CH3)2CHCOOH B CH3CH(COOH)CH3 and (CH3)2CHCOOH C CH3CHCOOH and CH3CH2CH2COOH D CH3CH2CH2COOH and (CH3)2CHCOOH

Accepted Answer

D

Question 26

26 Which reagents and conditions would result in the formation of butanenitrile, CH3CH2CH2CN? A 1-bromobutane heated under pressure with ammonia in ethanol B 1-bromopropane heated with potassium cyanide in ethanol C propanal heated with hydrogen cyanide in the presence of potassium cyanide D propanone heated with hydrogen cyanide in the presence of potassium cyanide

Accepted Answer

B

Question 27

27 Compound X, C7H13Br, reacts with hot alcoholic NaOH to produce two compounds, Y and Z. On reaction with Br2, Y gives a product, C7H12Br2, which exists as a mixture of four optical isomers. On reaction with Br2, Z gives a product, C7H12Br2, which is non-chiral. What could X be? A B C D CH3 Br CH2Br CH3 CH3 Br Br

Accepted Answer

A

Question 28

28 When illudin S is heated under reflux with an excess of acidified potassium dichromate(VI), compound M is formed. illudin S OH compound M OH HO O What is the molecular formula of compound M? A C15H16O4 B C15H16O5 C C15H18O4 D C15H18O5

Accepted Answer

B

Question 29

29 Cyclohexene, C6H10, is a hydrocarbon with a six-membered ring of carbon atoms. It has several structural isomers that are straight-chain alkenes. The number of double bonds in each of these molecules is P. What is the shape of the cyclohexene molecule and what is the value of P? shape P A planar 1 B planar 2 C non-planar 1 D non-planar 2

Accepted Answer

D

Question 30

30 Exhaust gases from an internal combustion engine are made less harmful by passing them through a catalytic converter. A number of reactions take place in the catalytic converter. Two such reactions are described in the table. Which row is correct? the type of reaction that the type of reaction that removes unburned removes carbon monoxide hydrocarbons A oxidation oxidation B oxidation reduction C reduction reduction D reduction oxidation

Accepted Answer

A

Question 31

31 Which compound reacts most rapidly with aqueous silver nitrate by an SN1 mechanism? A 1-chloromethylpropane B 2-chloromethylpropane C 1-iodomethylpropane D 2-iodomethylpropane

Accepted Answer

D

Question 32

32 Tartaric acid, HOOCCH(OH)CH(OH)COOH, is found in many plants. A sample of tartaric acid reacts with an excess of LiAlH4 to form the organic product J. What happens when NaOH(aq) is added to separate samples of tartaric acid and J? A Both tartaric acid and J react. B Only tartaric acid reacts. C Only J reacts. D Neither tartaric acid nor J react.

Accepted Answer

B

Question 33

33 Citric acid can be converted into tricarballylic acid in two stages. An intermediate, Q, is formed. CH2 COOH CH2 COOH stage 1 stage 2 HO C COOH Q CH COOH CH2 COOH CH2 COOH citric acid tricarballylic acid Which reagents are needed for each stage? stage 1 stage 2 A concentrated H2SO4 H2(g) and Ni B concentrated H2SO4 LiAlH4 C LiAlH4 H2SO4(aq) D NaOH(aq) H2(g) and Ni

Accepted Answer

A

Question 34

34 Structural and stereoisomerism should be considered when answering this question. P has molecular formula C5H10O. P produces an orange precipitate with 2,4-dinitrophenylhydrazine (2,4-DNPH reagent). How many isomeric structures does P have? A 5 B 6 C 7 D 8

Accepted Answer

D

Question 35

35 Two isomeric alcohols, W and X, have molecular formula C4H9OH. W is oxidised to carbonyl compound Y which gives a red precipitate with Fehling’s solution. X is oxidised to carbonyl compound Z which does not give a red precipitate with Fehling’s solution. Which of W and X gives a yellow precipitate with alkaline I2(aq)? A insufficient data is given to answer this question B W only C X only D neither W nor X

Accepted Answer

C

Question 36

36 The ester ethyl butanoate can be hydrolysed using an excess of dilute sodium hydroxide solution. Which substance is a product of this reaction? A CH3CH2CH2CO2Na B CH3CO2Na C CH3CH2ONa D H2O

Accepted Answer

A

Question 37

37 An aqueous solution contains 4.00g of a carboxylic acid, Q. When this solution reacts with an excess of magnesium, 380cm3 of gas is produced, measured at s.t.p. What is the relative formula mass of Q? A 59 B 118 C 126 D 236

Accepted Answer

B

Question 38

38 The infrared spectrum of an organic compound is shown. 100 transmittance / % 50 0 4000 3000 2000 1500 1000 500 wavenumber / cm–1 bond functional groups containing the bond characteristic infrared absorption range (in wavenumbers) / cm–1 C–O hydroxy, ester 1040–1300 C=C aromatic compound, alkene 1500–1680 C=O amide 1640–1690 carbonyl, carboxyl 1670–1740 ester 1710–1750 C≡N nitrile 2200–2250 C–H alkane 2850–3100 N–H amine, amide 3300–3500 O–H carboxyl 2500–3000 hydroxy 3200–3650 Which compound could give this spectrum? A CH3CH2CO2H B CH3CH(OH)CH3 C CH3COCH3 D CH3COCH2OH

Accepted Answer

C

Question 39

39 Cyclohexa-1,4-diene is treated with a solution of bromine in tetrachloromethane in the dark. cyclohexa-1,4-diene Which product is formed? A B C D Br Br Br Br Br Br Br Br Br Br Br Br Br Br

Accepted Answer

B

Question 40

40 2-methylbut-2-ene is reacted with hot, concentrated, acidified potassium manganate(VII) solution. What are the products of this reaction? A ethanal and propanone B ethanoic acid and propanone C ethanoic acid and propan-2-ol D ethanol and propan-2-ol

Accepted Answer

B

Question paper20 pages

Mark scheme3 pages

Questions as text

Q1 · Four equations representing reactions of nitrogen or one of its compounds are given

Q2 · The diagram shows the Boltzmann distribution for one mole of a gas

Q3 · A student carries out four experiments to investigate the rate of reaction between 3.0g…

Q4 · The table shows the partial pressures in an equilibrium mixture formed by the Haber…

Q5 · A reversible reaction is shown

Q6 · The ore psilomelane may be considered to have the general formula Ba(Mnx+)(Mny+)8O16(OH)4

Q7 · Silicon reacts with a mixture of calcium oxide and magnesium oxide at 1200 °C

Q8 · In which species is there a lone pair of electrons?

Q9 · Under which conditions will nitrogen behave most like an ideal gas?

Q10 · The equation for a chemical reaction is shown

Q11 · Molten aluminium chloride has a simple molecular structure

Q12 · Which atom contains four times as many neutrons as the atom?

Q13 · Which statement about the first ionisation energies of magnesium and neon is correct?

Q14 · In a sample of pure water, what is the maximum number of hydrogen bonds that one molecule…

Q15 · Hydrated cobalt(II) sulfate loses water when heated to give anhydrous cobalt(II) sulfate

Q16 · The table shows bond energies for some diatomic molecules

Q17 · Two procedures are described

Q18 · Powder P is a mixture containing two of AgCl, AgBr or AgI

Q19 · Two Period 3 elements, X and Y, burn separately in oxygen to form solid oxides

Q20 · Which row describes the structure and bonding of SiO2 and SiCl 4?

Q21 · A sample containing 0.010mol of anhydrous calcium nitrate is heated strongly until it…

Q22 · V and Z are both elements in Period 3 of the Periodic Table

Q23 · In Group 2 of the Periodic Table, the properties of the elements and their compounds show…

Q24 · Four properties of beryllium, Be, or a beryllium compound are listed

Q25 · Which two formulae correctly represent a pair of structural isomers?

Q26 · Which reagents and conditions would result in the formation of butanenitrile, CH3CH2CH2CN?

Q27 · Compound X, C7H13Br, reacts with hot alcoholic NaOH to produce two compounds, Y and Z

Q28 · When illudin S is heated under reflux with an excess of acidified potassium…

Q29 · Cyclohexene, C6H10, is a hydrocarbon with a six-membered ring of carbon atoms

Q30 · Exhaust gases from an internal combustion engine are made less harmful by passing them…

Q31 · Which compound reacts most rapidly with aqueous silver nitrate by an SN1 mechanism?

Q32 · Tartaric acid, HOOCCH(OH)CH(OH)COOH, is found in many plants

Q33 · Citric acid can be converted into tricarballylic acid in two stages

Q34 · Structural and stereoisomerism should be considered when answering this question

Q35 · Two isomeric alcohols, W and X, have molecular formula C4H9OH

Q36 · The ester ethyl butanoate can be hydrolysed using an excess of dilute sodium hydroxide…

Q37 · An aqueous solution contains 4.00g of a carboxylic acid, Q

Q38 · The infrared spectrum of an organic compound is shown

Q39 · Cyclohexa-1,4-diene is treated with a solution of bromine in tetrachloromethane in the…

Q40 · 2-methylbut-2-ene is reacted with hot, concentrated, acidified potassium manganate(VII)…

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