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A state of matterAnything that occupies space and has mass; contrasted with energy. in which the atomic-scale particles remain close together but are able to change their positions so that the matter takes the shape of its container
One of two or more substances that have the same molecular formulaThe chemical formula of a substance written using the subscripts that reflect the number of each kind of atom present in a molecule of the substance. For example, the simplest formula for ethane is CH3, but the molecular formula is C2H6 because there are 2 C atoms and 6 H atoms in a molecule of ethane. (are composed of elements in the same proportion and have the same molar massThe mass of a mole of substance; the same as molecular weight for molecular substances.), but differ in some aspect of structure.