atom - the smallest part of matter, molecule - made of 2 or more atoms, subscript (H2) - how many atoms of the element, coefficient (5H2O) - how many molecules, pure substance - made of the same atoms or molecules throughout, reactant - substances entering into a chemical reaction, product - substances resulting from a chemical reaction, conservation of mass - matter can not be created or destroyed, balanced equation - number of atoms in the reactants = the number of atoms in the products, matter - Anything that has mass and takes up space, element - A specific type of atom, physical change - A change in which no new substance is formed, chemical change - A change in which a new substance is formed,
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Matter & Reactions
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