Cambridge Pre-U

CHEMISTRY 9791/01
Paper 1 Multiple Choice May/June 2022
1 hour

You must answer on the multiple choice answer sheet.

*8281711417*

You will need: Multiple choice answer sheet Data booklet

Soft clean eraser
Soft pencil (type B or HB is recommended)

INSTRUCTIONS
• There are forty questions on this paper. Answer all questions.
• For each question there are four possible answers A, B, C and D. Choose the one you consider correct
and record your choice in soft pencil on the multiple choice answer sheet.
• Follow the instructions on the multiple choice answer sheet.
• Write in soft pencil.
• Write your name, centre number and candidate number on the multiple choice answer sheet in the
spaces provided unless this has been done for you.
• Do not use correction fluid.
• Do not write on any bar codes.
• You may use a calculator.

INFORMATION
• The total mark for this paper is 40.
• Each correct answer will score one mark. A mark will not be deducted for a wrong answer.
• Any rough working should be done on this question paper.

This syllabus is regulated for use in England, Wales and Northern Ireland as a Cambridge International Level 3 Pre-U Certificate.

This document has 16 pages. Any blank pages are indicated.

IB22 06_9791_01/FP
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1 The first five successive ionisation energies for element Q are shown.

738 kJ mol–1
1451 kJ mol–1
7733 kJ mol–1
10 541 kJ mol–1
13 629 kJ mol–1

In which group of the Periodic Table is Q?

A 1 B 2 C 13 D 14

2 Beams of protons, neutrons and electrons are passed between two oppositely charged plates. All
the particles travel at the same speed.

Three statements about the behaviour of the protons, neutrons and electrons are given.

1 The protons, neutrons and electrons travel in a curved path.

2 The electrons are deflected more than the protons.
3 The electrons are deflected towards the positive plate.

Which statements are correct?

A 1 and 2 B 1 and 3 C 2 and 3 D 2 only

3 The electronegativity values of five elements are shown.

element H C N O F
electronegativity value 2.1 2.5 3.0 3.5 4.0

Which molecules will have the strongest intermolecular forces between them?

A CO B F2 C HF D NO

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4 Data relevant to the enthalpy change of hydration of Na+(g) is given.

∆H o / kJ mol–1

∆hydH Cl –(g) –364

∆solH NaCl (s) +10
∆lattH NaCl (s) –780

What is the enthalpy change of hydration of Na+(g)?

A –1134 kJ mol–1
B – 406 kJ mol–1
C +406 kJ mol–1
D +1134 kJ mol–1

5 The diagram shows a reaction profile for an uncatalysed, reversible reaction.

X
reactants Z
energy
Y
products

progress of reaction

How would the values of X, Y and Z for a catalysed reaction compare with the values of X, Y and
Z for the uncatalysed reaction?

X Y Z

A bigger more negative the same

B bigger the same bigger
C smaller less negative smaller
D smaller the same smaller

6 Which value is essential to calculate the lattice energy of the compound NaH?

A electron affinity of hydrogen

B electron affinity of sodium
C first ionisation energy of hydrogen
D second ionisation energy of sodium

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7 The sketch graph shows how ∆G varies with temperature for a reaction.

0
0 temperature / K
∆G / kJ mol–1

What is the gradient of the line and what is the intercept?

gradient intercept, X

A ∆H ∆S
B ∆S ∆H
C –∆H ∆S
D –∆S ∆H

8 The same current passes through two electrolytic cells for the same amount of time. The first cell
contains XSO4(aq) while the second cell contains Y2SO4(aq). The relative atomic masses of X
and Y are in the ratio 1 : 2.

What is the ratio mass of X liberated : mass of Y liberated?

A 1:1 B 1:2 C 1:4 D 2:1

9 Two electrode potentials are shown.

S(s) + 2H+(aq) + 2e– H2S(aq) E o = +0.14 V

SO42–(aq) + 4H+(aq) + 2e– SO2(aq) + 2H2O(I) E o = +0.17 V

What is the cell diagram for a cell with a standard cell potential of +0.03 V?

A H2S(aq) | S(s) | 2H+(aq) || SO42–(aq) + 4H+(aq), SO2(aq) + 2H2O(I)

B Pt | H2S(aq) | S(s) | 2H+(aq) || SO42–(aq) + 4H+(aq), SO2(aq) + 2H2O(I) | Pt
C Pt | SO2(aq) + 2H2O(I), SO42–(aq) + 4H+(aq) || 2H+(aq) | S(s) | H2S(aq) | Pt
D SO2(aq) + 2H2O(I), SO42–(aq) + 4H+(aq) || 2H+(aq) | S(s) | H2S(aq)

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10 Which graph is a correct representation of Boyle’s Law?

A B C D

P P V V

0 0 0 0
0 1 0 V 0 T 0 1
V T

11 The theoretical lattice energy of MgI2 is –1944 kJ mol–1, whereas it is found by experiment to be
–2327 kJ mol–1.

Which statement best explains the difference in the two values?

A Magnesium iodide decomposes quickly in air at room temperature.

B The experimental lattice energy cannot be measured directly.
C The theoretical lattice energy is calculated assuming the bonding is purely ionic.
D The theoretical lattice energy is calculated assuming all ions have the same charge.

12 Elements are stored under different conditions depending on their reactivity.

Which row correctly describes the environment in which each element is stored?

white phosphorus, sodium,

P4 Na

A air oil
B air water
C water air
D water oil

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13 The diagram shows an experiment.

test-tube
containing test-tube
concentrated containing
sulfuric acid X silver nitrate solution
and solid Y and
sodium chloride excess aqueous ammonia

What is seen just after the two tubes are connected?

colour of gas in tube X observation in tube Y

A colourless no precipitate
B colourless white precipitate
C green no precipitate
D green white precipitate

14 Which statement about the elements in Group 14 and their compounds is correct?

A Carbon is a metalloid.

B Lead(II) oxide is more stable than lead(IV) oxide.

C Silicon is a better conductor of electricity than tin.

D Tin(IV) oxide has more covalent nature than germanium(IV) oxide.

15 Carbon and silicon are in Group 14 of the Periodic Table. They both form dioxides.

Which statement about the Group 14 dioxides is correct?

A The shape around both the carbon and the silicon atoms is linear.
B Both carbon and silicon form double bonds with oxygen.

C Silicon and oxygen form a stable π bond.

D Silicon-oxygen bonds are longer than carbon-oxygen bonds.

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16 Which statement about the transition metal complex shown is correct?

Cl

H 3N Pt NH3

Cl

A It has tetrahedral geometry around the platinum atom.

B It has no overall dipole moment.

C It is a complex of platinum(IV).
D It is a cis isomer.

17 Geometric isomers and optical isomers are both types of stereoisomers.

How many stereoisomers will the octahedral complex ion [Cr(H2NCH2CH2NH2)2Cl 2]+ have?
A 0 B 2 C 3 D 4

18 Solution X is added to a warm mixture of an organic compound Y and Cr2O72–(aq).

A reaction occurs producing [Cr(H2O)6]3+ ions.

What are X and Y?

X Y

A H2SO4(aq) C2H5OH
B H2SO4(aq) CH3COOH
C NaOH(aq) C2H5OH
D NaOH(aq) CH3CHO

19 Which row describes a cubic close-packed metal structure?

arrangement of the coordination

close-packed layers number of atoms

A ABAB 8
B ABAB 12
C ABCABC 8
D ABCABC 12

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20 Which skeletal formula shows the structure of 2-bromo-2-methylbutane?

A B C D
Br Br Br Br

Br

21 The equation shows the change brought about by reaction of but-1-ene with hot
potassium manganate(VII).

CH3CH2CH=CH2 + 5[O] → CH3CH2COOH + CO2 + H2O

What is the total number of functional group levels moved up by carbon atoms in this reaction?

A 4 B 5 C 6 D 7

22 The diagram shows 2-chloro-2-fluoropropane.

CH3

H3C C Cl

What is the hydrolysis product of 2-chloro-2-fluoropropane under mild conditions?

A B C D

CH3 CH3 CH3 CH3

H3C C OH H3 C C OH H3 C C Cl C
H 3C O
OH F OH

23 Four different esters undergo acid hydrolysis. The products of each hydrolysis are then heated
under reflux with an acidified aqueous solution of potassium dichromate(VI).

Which ester would give two different carboxylic acids as the products of this reaction sequence?

A B C D
O O O O

O O O O

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24 Which equation represents moving within a functional group level?

A CH3COCH3 + CH3CH2MgBr → CH3CH2C(CH3)2OMgBr

B (CH3)2CO + HCN → (CH3)2C(OH)CN

C CH3C(O)OC(O)CH3 + H2O → 2CH3COOH

D 3CH3CHO + Cr2O72– + 8H+ → 3CH3COOH + 2Cr3+ + 4H2O

25 An alcohol, X, can be dehydrated producing a hydrocarbon.

Polymerisation of this hydrocarbon gives the polymer shown.

H C 2H 5 H C 2H 5

C C C C

H H H H

What is X?

A 2-methylpropan-1-ol
B butan-1-ol
C ethanol
D propan-1-ol

26 Propene reacts with HBr in a polar solvent to give a mixture of products.

Which statement about this reaction is correct?

A One of the hydrogen atoms involved behaves as an electrophile.

B The first step involves a nucleophilic attack on an alkene functional group.

C The first step involves homolytic fission of a π bond.

D The major product is 1-bromopropane.

27 Which reaction must have an atom economy of 100%?

A an addition reaction
B a neutralisation reaction
C a redox reaction
D a substitution reaction

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28 Which compound will undergo hydrolysis to produce carbon dioxide as a product?

A CH3COCl B H2CO C HCOOCH3 D (H2N)2CO

29 A single enantiomer, X, is hydrolysed with aqueous sodium hydroxide. The product of the
hydrolysis is racemic.

Which row could be correct?

structural formula of X mechanism of hydrolysis

A CH(CH3)(C2H5)Br SN1
B CH(CH3)(C2H5)Br SN2
C C2H5CHBrC2H5 SN1
D C2H5CHBrC2H5 SN2

30 The molecule shown can react with two molecules of hydrogen bromide.

Br
Br

Which statement explains why the bromine atoms are found in the positions shown?

A The bromine atom is added before the hydrogen atom.

B The hydrogen atom is added before the bromine atom.
C The intermediate carbocations are higher in energy when they are more substituted.
D The intermediate carbocations are lower in energy when they are more substituted.

31 Nitrobenzene can be reduced to phenylamine using tin and hydrochloric acid. The final step of
this process is addition of excess sodium hydroxide to the reaction mixture.

Why is the sodium hydroxide added?

A to decompose any remaining starting material

B to dry the product
C to hydrolyse the intermediate
D to react with phenylammonium chloride

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32 The table contains statements about the relative acidity of water and phenol, and about the
relative basicity of water and propylamine.

Which row is correct?

relative acidity of relative basicity of

water and phenol water and propylamine

A phenol > water propylamine > water

B phenol > water water > propylamine
C water > phenol propylamine > water
D water > phenol water > propylamine

33 Which statement about aminoethanoic acid is correct?

A It can form an addition polymer.

B It contains a chiral carbon atom.
C It forms zwitterions by the donation of a proton from an amine group.
D It is soluble in water.

34 Compound Q has two chiral centres, marked as X and Y on the diagram.

Cl Br H OH

X Y

What is the R/S assignment for each chiral centre?

X Y

A R R
B R S
C S R
D S S

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35 A large excess of aqueous silver nitrate is added to aqueous barium chloride and the precipitate
removed by filtration.

What are the most abundant ions in the filtrate?

A Ag+, Ba2+ and NO3–

B Ag+ and NO3– only
C Ba2+, NO3– and Cl –
D Ba2+ and NO3– only

36 What is shown on the mass spectra of the compounds 1-chloropropane, CH3CH2CH2Cl , and
2-chloropropane, CH3CHCl CH3?

A Both spectra have a single molecular ion peak at 78.5.

B Both spectra have molecular ion peaks at 78 and 80 with integration heights in the ratio 1 : 1.
C Both spectra have molecular ion peaks at 78 and 80 with integration heights in the ratio 3 : 1.
D The two spectra have molecular ion peaks which are different from each other.

37 Why do the emission lines in the visible spectrum of hydrogen converge at high frequency?

A Emission lines represent transitions from excited states to the ground state.
B The energies of photons are quantised.
C The energy levels of the excited hydrogen atom get closer together at high energy.
D The photons in the visible region have a higher energy than those in the infra-red region.

38 An organic compound contains only one oxygen atom. The infra-red spectrum of the compound
has a broad peak at wavelength 3350 cm–1.

What is the arrangement of the oxygen atom in the molecule?

A B C D

C C O H C O C C O

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39 The 13C NMR spectrum of a compound with formula C4H8O2 shows peaks at 15 ppm, 20 ppm,
60 ppm and 175 ppm.

What is the structure of the compound?

A HOCH2CHCHCH2OH

B HCOOCH(CH3)2

C CH3COOCH2CH3

H H

D HO C C OH

H C C H

H H

1
40 How many possible orientations does a magnetic dipole of a spin 2
nucleus adopt in an external
magnetic field?

A 1 B 2 C 4 D ∞ (infinity)

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