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Pearson Edexcel International Advanced Level
Friday 12 January 2024
Morning (Time: 1 hour 45 minutes) Paper
reference WCH15/01
Chemistry
International Advanced Level
UNIT 5: Transition Metals and Organic
Nitrogen 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 boxes at the top of this page with your name,
centre number and candidate number.
•• Answer all questions.
Answer the questions in the spaces provided
– there may be more space than you need.
Information
•• The total mark for this paper is 90.
The marks for each question are shown in brackets
– use this as a guide as to how much time to spend on each question.
• structure
In the question marked with an asterisk (*), marks will be awarded for your ability to
your answer logically, showing how the points that you make are related or
follow on from each other where appropriate.
• A Periodic Table is printed on the back cover of this paper.
Advice
• Read each question carefully before you start to answer it.
•• Show all your working in calculations and include units where appropriate.
Try to answer every question.
• Check your answers if you have time at the end. Turn over
, SECTION A
Answer ALL the questions in this section.
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA 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 The apparatus can be used to measure E cell for the reaction shown.
2Cr3+(aq) + Zn(s) → 2Cr2+(aq) + Zn2+(aq)
V
electrode 1 electrode 2
salt bridge
Zn2+(aq) Cr2+(aq) and Cr3+(aq)
(a) Which electrodes are used for this cell?
(1)
electrode 1 electrode 2
A platinum platinum
B platinum chromium
C zinc chromium
D zinc platinum
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*P73457RA0236*
, (b) A student wishes to measure the standard cell potential, E cell , of this cell.
The right‑hand cell requires Cr3+ and Cr2+ ions.
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
What mass of Cr2(SO4)3 ·18H2O must be dissolved in 1.00 dm3 of deionised water to
give the concentration of Cr3+ ions required to measure this E cell ?
(1)
A 52.0 g
B 196 g
C 358 g
D 716 g
(c) What can be deduced from the fact that, for this reaction, E cell is positive?
(1)
A ΔStotal and ln K are positive
B ΔStotal and ln K are negative
C ΔStotal is positive and ln K is negative
D ΔStotal is negative and ln K is positive
(Total for Question 1 = 3 marks)
Use this space for any rough working. Anything you write in this space will gain no credit.
3
*P73457RA0336* Turn over
, 2 The half‑equations for a hydrogen‑oxygen fuel cell in alkaline solution are shown.
2H2O(l) + 2e– → H2(g) + 2OH–(aq) E = –0.83 V
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
½O2(g) + H2O(l) + 2e– → 2OH–(aq) E = +0.40 V
(a) The equation for the overall cell reaction is
(1)
A 3H2O(l) + ½O2(g) → H2(g) + 4OH–(aq)
B H2(g) + 4OH–(aq) → 3H2O(l) + ½O2(g)
C H2(g) + ½O2(g) → H2O(l)
D H2O(l) → H2(g) + ½O2(g)
(b) Calculate E cell for the reaction occurring in the hydrogen‑oxygen fuel cell, under
alkaline conditions.
(1)
A –1.23 V
B –0.43 V
C +0.43 V
D +1.23 V
(Total for Question 2 = 2 marks)
Use this space for any rough working. Anything you write in this space will gain no credit.
4
*P73457RA0436*
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