Homework 7
- Page ID
- 204083
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Name: ______________________________
Section: _____________________________
Student ID#:__________________________
Q1
Draw sketches to illustrate the following symmetry elements:
- a vertical mirror plane and a \(C_2\) axis in \(O_3\) (ozone)
- a horizontal mirror plane in \(CO_2\)
- an \(S_4\) axis in methane
- all of the symmetry elements in \(CH_3F\) (point group \(C_{3v}\))
- all of the symmetry elements in ethene (point group \(D_{2h}\))
Q2
Determine the symmetry elements possessed by an \(s\) orbital, a \(p\) orbital, a \(d_{z^2}\) orbital, and a \(d_{xy}\) orbital.
Q3
Which of the following molecules has either i) a center of inversion or ii) an \(S_4\) axis?
- \(CO_2\)
- \(C_2H_2\)
- \(BF_3\)
- \(SO_4^{2-}\)
Q4
Identify the symmetry elements in the following molecules, and assign each one to a point group
- \(NH_2Cl\)
- \(SiF_4\)
- \(\ce{H-C#N}\)
- \(SiFClBrI\)
- \(NO_2\)
- \(H_2O_2\)
Q5
- What are the symmetry elements that prevent a molecule from being polar? Which of the molecules in Q4 are polar?
- What are the symmetry elements that exclude chirality? Which (if any)of the molecules in Q4 may be chiral?