atom - The smallest particle of a substance, molecule - When atoms join with other similar or different atom, element - A substance that is made up of only one kind o, compound - A substance that is formed when two or more elements combine chemically, mixture - Two or more substances simply mixed together, but not chemically, chemical symbol - abbreviations used to represent elements, chemical formula - Representation of a molecule of a compound, chemical equation - The shorthand form of representing a chemical reaction using symbols and formulae, chemical change - When two chemical substances react to produce new substances with a different set of properties, physical change - Those changes in which no new substances are formed, crystal - The purest solid form of a substance having a definite geometrical shape, crystallization - The process by which an impure compound is converted into its crystals,

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