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Date May 2013 Marks available 1 Reference code 13M.2.hl.TZ2.3
Level HL Paper 2 Time zone TZ2
Command term State Question number 3 Adapted from N/A

Question

Carboplatin used in the treatment of lung cancer has the following three-dimensional structure.

M13/4/CHEMI/HP2/ENG/TZ2/03

Elemental platinum has electrons occupying s, p, d and f atomic orbitals.

Identify the name of the functional group circled in the structure of carboplatin.

[1]
a.

State the type of bonding between platinum and nitrogen in carboplatin.

[1]
b.

Draw the shape of an s orbital and a px orbital. Label the x, y and z axes on each diagram.

M13/4/CHEMI/HP2/ENG/TZ2/03.c.i

[2]
c.i.

State the maximum number of orbitals in the \(n = 4\) energy level.

[1]
c.ii.

A number of ruthenium-based anti-cancer drugs have also been developed. State the full electron configuration of the ruthenium(II) ion, \({\text{R}}{{\text{u}}^{2 + }}\).

[1]
d.

Iron is in the same group in the periodic table as ruthenium.

Construct the orbital diagram (using the arrow-in-box notation) for iron, showing the electrons in the \(n = 3\) and \(n = 4\) energy levels only and label each sub-level on the diagram.

M13/4/CHEMI/HP2/ENG/TZ2/3.e

[1]
e.

Markscheme

ester;

Do not accept just carbonyl.

Allow carboxylato (ligand)/carboxylate (ligand) but not carboxyl/carboxy.

a.

dative (covalent) / coordinate;

Do not allow just covalent or co-dative.

b.

M13/4/CHEMI/HP2/ENG/TZ2/03.c.i_1/M

symmetrical s orbital representation;

Do not penalize if axes are not labelled for s orbital.

x, y, z can be located in any direction.

M13/4/CHEMI/HP2/ENG/TZ2/03.c.i_2/M

dumbbell-shaped px orbital representation with electron density located along x-axis;

x-axis must be labelled for px orbital.

Do not accept if py and pz are also drawn as question asks for orbital not sub-level.

c.i.

16;

c.ii.

\({\text{1}}{{\text{s}}^{\text{2}}}{\text{2}}{{\text{s}}^{\text{2}}}{\text{2}}{{\text{p}}^{\text{6}}}{\text{3}}{{\text{s}}^{\text{2}}}{\text{3}}{{\text{p}}^{\text{6}}}{\text{4}}{{\text{s}}^{\text{2}}}{\text{3}}{{\text{d}}^{{\text{10}}}}{\text{4}}{{\text{p}}^{\text{6}}}{\text{4}}{{\text{d}}^{\text{6}}}\);

Order of 4s and 3d levels can be interchanged.

Do not accept other notation such as subscripts.

d.

M13/4/CHEMI/HP2/ENG/TZ2/03.e/M

Allow full arrows instead of half-arrows in orbital diagram.

Sub-levels must be labelled for mark.

e.

Examiners report

Many candidates identified the functional group but not the type of bond between Pt and N in carboplatin. A surprising number of candidates were unable to draw a px orbital or drew all p orbitals, or did not label the axis

a.
[N/A]
b.
[N/A]
c.i.

Very few gave 16 as the answer.

c.ii.
[N/A]
d.
[N/A]
e.

Syllabus sections

Core » Topic 2: Atomic structure » 2.2 Electron configuration
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