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FoS_Chem_I_Assignment

FoS_Chem_I_Assignment - Dr Timon McPhearson's Sections...

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Question 1. How many possibilities? As Professor Nuckolls mentioned during lecture, almost all the synthetic compounds we come into contact with on a day-to-day basis are composed of four elements: C, H, N, and O. An amazing variety of compounds can be made from these basic building blocks. Recall that hydrogen generally just completes the number of bonds that each C, N, or O needs, and doesn’t make up the “backbone” of a molecule. For example, carbon always needs four bonds, so a 1- carbon backbone will be CH 4 . With a 2-carbon backbone, each carbon needs 3 more bonds (after the C-C bond is counted) so the formula is CH 3 CH 3 and a 3-carbon backbone would have the chemical formula CH 3 CH 2 CH 3 . The chemical structures are shown below—note that any place where lines begin, end, meet, or bend there is a carbon—since this is the “default” molecule, chemists don’t draw them. Also, it’s assumed that there are always enough hydrogens
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