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coal that is heated in the absence of air to about 1 000 Â°C to remove volatile substances.
the ratio of the amount of a pure compound to the amount of substance containing that compound...
reactions that raise the temperature of the surroundings by liberating energy
bonds that form between the hydrogen atom of one molecule and an oxygen, nitrogen or fluorine...
molecules that consist of two atoms.
the simplest ratio of atoms of the different elements in the compound.