CHE216
Assessed Coursework 1
Submit your answers as a separate file
Deadline Friday 21 March 16:00 h
1 The molecule ammonia, NH3, had C3v symmetry and the molecule boron trifluoride, BF3, had D3v symmetry.
Explain why the symmetry of NH3 begins with a “C” while that of BF3 begins with a “D.” [5 marks]
2 Explain what is meant by the term symmetry element. [5 marks]
3 Explain what is meant by the term symmetry operation. [5 marks]
4 Explain what is meant by each of the following symmetry operations.
i) σv,
ii) σd,
iii) σh,
iv) i,
v) S3.
[2 marks each]
5 Draw diagrams showing every symmetry element in each of the molecules below. [10 marks each]
6 Identify the symmetry group of each of the molecules below. [5 marks each]