system - a group of related objects that interact and form a complex whole, Law of Conservation of Mass - natural law that states the same amount of mass is present before and after a chemical reaction, reactants - the chemicals present BEFORE a chemical reaction occurs, products - the chemicals present AFTER a chemical reactionoccurs, molecule - a unit of two or more atoms, atom - the smallest possible particle of an element, matter - the stuff that everything is made of, compound - a pure substance that is made up of atoms of two or more different elements, precipitate - a solid that forms when two liquids react, synthesis - a type of chemical reaction that involves the combination of substances to create a product that is a chemically bonded combination of the reactants ,

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