A-LevelChemistryChemical bonding9701/42 · Oct/Nov 2018 · Q27 Marks
Complete the electronic configuration for Cu and Cu2+. 3d | 4s Cu [Ar] | 1 Cu2+ [Ar] | 1
- (a)Complete the electronic configuration for Cu and Cu2+. 3d | 4s Cu [Ar] | 1 Cu2+ [Ar] | 1[2]
- (b)(i)The 3d orbitals in an isolated Cu2+ ion are degenerate. Explain what is meant by the term degenerate in this context.[1]
- (b)(ii)Complete the diagram to describe the splitting of the 3d orbital energy levels in an octahedral complex. energy [Figure 2.0] isolated Cu2+ ion | Cu2+ in octahedral complex[1]
- (c)(i)1,2-diaminoethane, H2NCH2CH2NH2, en, is a bidentate ligand. Explain what is meant by the term bidentate.[1]
- (c)(ii)Cu2+ ions and en form the complex ion [Cu(en)3]2+. Draw the two optical isomers of this complex ion. You may use N N to represent en. [Figure 2.1][2]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2018). The mark or mark type is shown in brackets.
- [1] × 2 [for (a) Cu: 3d(10) 4s(1), Cu2+: 3d(9) 4s(0)]
- [1] orbitals have the same energy
- [1] d-d splitting seen, leading to 2 upper and 3 lower orbitals
- [1] an ion / molecule that donates two pairs of electrons
- [1] one correct
- [1] two correct and mirror images of each other
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