Edexcel GCE
Chemistry
Advanced
Unit 5: General Principles of Chemistry II –
Transition Metals and Organic Nitrogen
Chemistry (including synoptic assessment)
Tuesday 17 June 2014 – Afternoon Paper Reference
Time: 1 hour 40 minutes 6CH05/01
You must have: Data Booklet Total Marks
Candidates may use a calculator.
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PEARSON EDEXCEL GCE A-LEVEL CHEMISTRY 6CH05/01
ADVANCED UNIT 5 GENERAL PRINCIPLES OF
CHEMISTRY 2 TRANSITION METALS AND ORGANIC
NITROGEN CHEMISTRY [including synoptic assessment]
Answer ALL the questions in this section. 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 In which of the following ions does the metal have an oxidation number of +3?
A MnO42–
B VO2+
C [Fe(CN)6]4–
D [CrCl2(H2O)4]+
(Total for Question 1 = 1 mark)
2 Copper metal is oxidized to Cu2+ by nitrate(V) ions which are
reduced to nitrogen monoxide, NO.
By considering the changes to the oxidation numbers of copper and nitrogen, it
can be deduced that in this reaction
A 2 mol of copper reacts with 3 mol of nitrate(V) ions.
B 2 mol of copper reacts with 5 mol of nitrate(V) ions.
C 3 mol of copper reacts with 2 mol of nitrate(V) ions.
D 5 mol of copper reacts with 2 mol of nitrate(V) ions.
(Total for Question 2 = 1 mark)
Use this space for any rough working. Anything you write in this space will gain no credit.
2
*P42973A0228*
,
, 3 The diagram below shows a cell set up between a copper metal / copper(II)
ion electrode and a reference electrode, known as a calomel electrode.
V
copper metal salt
bridge
calomel electrode
copper(II) sulfate
solution
Under standard conditions, the emf of this cell was −0.07 V. The standard
electrode potential of the copper metal / copper(II) ion electrode is +0.34 V.
Hence the standard electrode potential of the calomel electrode is
A −0.41 V
B −0.27 V
C +0.27 V
D +0.41 V
(Total for Question 3 = 1 mark)
4 For the reaction
2NO2(g) N2O4(g)
at 450 K the total entropy change, ǻStotal, is negative. Hence the equilibrium
constant, Kp, for this reaction at 450 K is
A zero.
B positive and greater than 1.
C positive and less than 1.
D negative.
(Total for Question 4 = 1 mark)
3
*P42973A0328* Turn over
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