To work out bond polarity you need to do the following:
1. Draw the lewis diagram.
2. Work out the shape.
3. check that the bond polarities cancel out. Is the a net dipole moment?
in your answer for explaining polarity... include the following words.
polar bonds, electronegativity, net dipole, symmetrical, asymmetrical
Remember:
symmetrical molecules = non-polar
asymmetrical molecules = polar
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