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mass per unit volume of a substance. The number of molecules in a particular area or a measure of the compactness of a substance.
the levels of energy in which electrons move and which have fixed amounts of energy.
the separation of a dye into the different colours that make up that dye, as a result of the...
the simplest type of pure substance that cannot be broken down into simpler components.
numbers that are used to keep track of the transfer of electrons during redox reactions.