Chemicals are any chemical substances created by laboratory or industrial chemical operations. Pure substances or combinations of substances can be used. Organic and inorganic chemicals are the two types of chemicals. Inorganic chemistry (inorganic matter) deals with the other elements of the periodic table and their compounds, whereas organic chemistry deals with almost all carbon-containing substances. With the exception of a few simple carbon compounds that are created like normal inorganic substances or that are assigned to inorganic chemistry for historical reasons, inorganic chemistry deals with the structure and characteristics of carbon-free molecules.
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