atom - the smallest type of particle, compound - a substance that contains atoms of two or more different elements, and these atoms are chemically joined together., element - a substance that cannot be broken down into any other substance., heat - Used to start a reaction, formula - is a notation used by scientists to show the number and type of atoms present in a molecule, molecule - is a particle made up of two or more atoms that are chemically bonded together, product - is a substance that is formed as the result of a chemical reaction., reactant - a substance that takes part in and undergoes change during a reaction., reaction - a process in which one or more substances, the reactants, are converted to one or more different substances, the products., word equation - represents a chemical reaction using the names of the substances involved.,

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