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a chemical reaction in which heat, pressure or a catalyst is used, singly or in combination, to rearrange the atoms in molecules to form new molecules.
a molecule that is so big that we can see it, e.g. diamond.
a measure of the number of bonds formed by an atom of a given element.
the process during which nitrogen gas is converted into substances that can be used by plants,...
horizontal tunnels that are dug from the working shaft to the ore body in a mine.