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Carbon forms more compounds than all the other elements put together, from the methane in a gas stove to the DNA in your cells. Organic chemistry is the study of these compounds. In this chapter you learn how to draw and name them, how isomers with the same formula differ, how electrons shift inside a molecule and decide how it reacts, and how a chemist separates a pure substance and finds what it contains. Python names alkanes and counts isomers.