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reactants the substances that react in a chemical reaction products the substances that are formed by the chemical reaction precipitate a solid that forms from a solution during a chemical reaction hydrogen test squeaky pop with lighted splint carbon dioxide test turns limewater milky combustion a process in which a substance reacts with oxygen to give heat and light combustion triangle fuel, oxygen, heat oxide any compound of oxygen with another element methane a colorless odorless gas used as a fuel chemical reaction the process by which one or more substances change to produce one or more different substances physical reaction a reaction in which no new substances are formed fuel a material that releases energy when it burns solution a mixture in which one substance is dissolved in another solute substance that is dissolved solvent the substance that does the dissolving filtering a technique used to separate a solid and a liquid distillation a process that separates the liquids in a solution based on their boiling points evaporation the change of a substance from a liquid to a gas filtrate the liquid that has had solid removed from it by filtering residue solid that remains after liquid has been removed solubility the ability to dissolve in another substance saturated being the most concentrated solution possible at a given temperature exothermic chemical reaction in which energy is primarily given off in the form of heat endothermic a reaction in which energy is absorbed mixture a combination of two or more substances that are not chemically combined