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Chap 2 Matter/Change

QuestionAnswer
atom The smallest particle of an element that retains its identity in a chemical reaction.
chemical change/reaction A change in which one or more reactants change into one or more products; characterized by the breaking of bonds in reactants and the formation of bonds in products. New substances are formed.
chemical property The ability of a substance to undergo a specific chemical change. Describes how a substance reacts.
compound A substance that contains two or more elements combined in fixed proportions.
element The simplest form of matter that has a unique set of properties; cannot be broken down into simpler substances by chemical means.
gas A form of matter that takes the shape and volume of its container; has no definite shape or volume.
heterogeneous mixture A mixture that is not uniform in composition; components are not evenly distributed throughout the mixture. The mixture looks different throughout.
homogeneous mixture A mixture that is uniform in composition; components are evenly distributed and not easily distinguished. The mixture looks the same throughout.
liquid A form of matter that flows, has a fixed volume and an indefinite shape.
mass A measure of the amount of matter an object contains.
mixture A physical blend of two or more substances that are not chemically combined.
molecule A neutral group of atoms joined together by covalent bonds.
physical change A change during which some properties of a material change, but the composition of the material does not change.
physical property A quality or condition of a substance that can be observed or measured without changing the substance’s composition.
solid A form of matter that has a definite shape and volume.
solution A homogeneous mixture, consists of solutes dissolved in a solvent.
volume A measure of the space occupied by a sample of matter.
Created by: annericson