Atom - Smallest unit of matter, Coefficient - Properties of a product, Periodic table - A table of chemical elements arranged in order of atomic number, Chemical property - A characteristic of a particular substance that can be observed in a chemical reaction (Flammability, toxicity, chemical stability), Product - A substance that is formed through a chemical reaction, Reactivity - What a substance does when met with another substance, Precipitate - An insoluble solid that emerges from a liquid solution, Law of conservation - The total energy of an isolated system remains constant; it is said to be conserved over time, Reactant - A substance that takes part in and undergoes change during a reaction, Chemical formula - The number of atoms of each element in a compound, Chemical substance - Any material with a definite chemical composition, Compound - Any substance made of two or more chemical elements, Dissolve - To cause to disperse or disappear, Element - A substance that cannot be broken down into any other substance, Molecule - The smallest particle of a substance that has all of the physical and chemical properties of that substance; made up of one or more atoms, Symbol - Abbreviations for chemical elements in the periodic table, Chemical reaction - A process that leads to chemical transformation, Physical change - Changes affecting the form of a chemical substance, but not its chemical composition, Mass - The measure of the amount of matter in a body, Solution - A homogeneous mixture of two or more substances,

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