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boiling point the temperature at which a substance boils. chemical change a change that occurs when one or more substances change into entirely new substances with different properties chemical equation a representation of a chemical reaction that uses symbols to show the relationship between the reactants and the products chemical property a property used to characterize materials in reactions that change their identity combustibility The chemical property of being able to burn density the ratio of the mass of a substance to the volume of the substance ductility the ability to be stretched into wire flammability the ability of a substance to burn freezing point the temperature at which a substance freezes inertia the tendency of an object to resist being moved or, if the object is moving, to resist a change in speed or direction until an outside force acts on the object Law of Conservation of Mass (Matter) the law that states that mass cannot be created or destroyed in ordinary chemical and physical changes malleability the ability to be hammered or shaped without breaking mass a measure of the amount of matter in an object melting point the temperature at which a substance changes from a solid to a liquid physical change a change of matter from one form to another without a change in chemical properties physical property a characteristic of a substance that does not involve a chemical change, such as density, color, or hardness precipitate a solid that is produced as a result of a chemical reaction in solution product a substance that forms in a chemical reaction reactant a substance or molecule that participates in a chemical reaction reaction a process in which one or more substances are changed into others reactivity the ability of a substance to combine chemically with another substance volume a measure of the size of a body or region in three-dimensional space weight a measure of the gravitational force exerted on an object; its value can change with the location of the object in the universe