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a mixture that consists of visibly different substances or phases.
small electrical cells such as those in watches, pacemakers, hearing aids and calculators.
the isotope of hydrogen that contains two neutrons.
(also called coordinate bond) one atom contributes both electrons (or a lone pair of electrons)...
the species or substance that exists before a chemical reaction has occurred. A substance added...
the introduction of halogen atoms into a compound by addition or substitution.