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matter cannot be created or destroyed in a chemical reaction.
a new species or substance that exists after a chemical reaction has occurred. This excludes un-...
(also called allotropism) the property of some chemical elements to exist in two or more...
a mixture that consists of visibly different substances or phases.
atoms of the same element that contain equal numbers of protons (same atomic number) but...
a molecule that is so big that we can see it, e.g. a diamond, a salt crystal and a piece of...