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Pearson Edexcel International Advanced Level International Advanced Level UNIT 4: Rates, Equilibria and Further Organic Chemistry QP MAY 2024$12.99
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Centre Number Candidate Number
Pearson Edexcel International Advanced Level
Wednesday 29 May 2024
Morning (Time: 1 hour 45 minutes) Paper
reference WCH14/01
Chemistry 🞍 🞍
International Advanced Level
UNIT 4: Rates, Equilibria and Further
Organic Chemistry
You must have: Total Marks
Scientific calculator, Data Booklet, ruler
Instructions
•• Use black ink or ball-point pen.
If pencil is used for diagrams/sketches/graphs it must be dark (HB or B).
• Fill in the
centre boxes
number andatcandidate
the top ofnumber.
this page with your name,
•• Answer
Answer all
thequestions.
questions in the spaces provided
– there may be more space than you need.
• Show all your working in calculations and include units where appropriate.
Information
•• The total mark for this paper is 90.
The marks for each question are shown in brackets
• Into the
– use this as a guide as to how much time to spend on each question.
question marked with an asterisk (*) marks will be awarded for your ability
structure your answer logically, showing how the points that you make are
related or follow on from each other where appropriate.
• There is a Periodic Table on the back cover of this paper.
Pearson Edexcel International Advanced Level International Advanced Level UNIT 4: Rates, Equilibria and Further Organic
Chemistry QP MAY 2024
Advice
• Read each question carefully before you start to answer it.
• Try
• Check your answers if you have time at the end.
to answer every question.
Turn over
, SECTION A
Answer ALL the questions in this section.
DO NOT WRITE IN THIS AREA
You should aim to spend no more than 20 minutes on this section.
For each question, select one answer from A to D and put a cross in the box . If you change
your mind, put a line through the box and then mark your new answer with a cross .
1 Bromate(V) ions, BrO–3, react with bromide ions, Br–, in aqueous acid.
BrO– + 5Br– + 6H+ 3Br + 3H O
3 2 2
The rate equation for the reaction is shown.
rate = k [BrO–3] [Br–] [H+]2
(a) Which continuous monitoring method could be used to obtain kinetics data for
this reaction?
(1)
A colorimetry
DO NOT WRITE IN THIS AREA
B mass change
C titration with sodium thiosulfate
D volume of gas evolved
(b) What are the units of the rate constant, k, for this reaction?
(1)
A mol dm–3 s–1
B dm3 mol–1 s–1
C dm6 mol–2 s–1
D dm9 mol–3 s–1
DO NOT WRITE IN THIS AREA
(c) The concentrations of all reactants are halved.
By what factor does the rate of reaction change?
1 (1)
A
2
1
B
4
1
C
8
1
D 16
2
🞍🞍🞍🞍
, (d) The first four steps in the reaction mechanism are shown.
Step 1 BrO3– + H+ BrO H 3
DO NOT WRITE IN THIS AREA
Step 2 BrO3H + H+ BrO H+
3 2
Step 3 BrO H+ + Br– Br O + H O
3 2 2 2 2
Step 4 Br2O2 + Br– BrO– +2 Br2
Which is the rate-determining step?
(1)
A Step 1
B Step 2
C Step 3
D Step 4
(Total for Question 1 = 4 marks)
DO NOT WRITE IN THIS AREA
2 Some data on lattice energies are shown.
Experimental lattice energy / Theoretical lattice energy /
Compound
kJ mol–1 kJ mol–1
NaI –705 –687
AgBr –891 –816
Rb2S –1944 –1904
Li2O –2814 –2799
Which compound has the greatest degree of covalency within its ionic bonds?
DO NOT WRITE IN THIS AREA
A NaI
B AgBr
C Rb2S
D Li2O
(Total for Question 2 = 1 mark)
3
🞍🞍🞍🞍 Turn over
, 3 An enthalpy cycle for lead(II) nitrate is shown.
All values are in kJ mol–1. The cycle is not to scale.
DO NOT WRITE IN THIS AREA
Pb2+(g) + 2NO–3(g)
–1485
Pb2+(aq) + 2NO–3(g)
–2151
Pb(NO3)2(aq)
+38
Pb(NO3)2(s) + aq
DO NOT WRITE IN THIS AREA
(a) Which of these statements is true?
(1)
A the enthalpy change of formation of lead(II) nitrate is –2151 kJ mol–1
B the enthalpy change of solution of lead(II) nitrate is exothermic
C the enthalpy change of hydration of a lead(II) ion is more exothermic
than that of a nitrate ion
D the entropy change of the surroundings for dissolving lead(II) nitrate
is positive
(b) Using the enthalpy cycle, it can be calculated that the enthalpy change of
hydration of a nitrate ion, in kJ mol–1, is
(1)
A –3598
DO NOT WRITE IN THIS AREA
B –1799
C –628
D –314
(Total for Question 3 = 2 marks)
4
🞍🞍🞍🞍
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