We chemists (and especially organic chemists) like to depict bonds using simple lines and, sometimes, some other more elaborate depictions like the "polytube" representation of
beta-carotene shown above. Beta-carotene contains single bonds (C—C, C—H) and double bonds (C=C) all of which we can conveniently represent as lines thanks to
Kekulé's depictions. But, as know from basic chemistry, and as we will continue discussing in class, there are many ways to represent a chemical bond. If at some point you feel that you are not understanding one of those ways well, feel at ease that the meaning of a chemical bond is still difficult to rigorously define even today. Read the blog post '
What is a bond?' by Philip Ball to see what I mean.
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