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Law of Conservation of Mass Nothing is ever created or destroyed, only changed. Product always=reactants
Physical Change A usually reversible change in the physical properties of a substance, as size or shape
Chemical Change A usually irreversible chemical reaction involving the rearrangement of the atoms of one or more substances and a change in their chemical properties or composition, resulting in the formation of at least one new substance
Element Substance that cannot be broken down into simpler substances
Chemical Formula A representation of a substance using symbols for its constituent elements
Element (Diatomic) Molecule Molecule composed only of two atoms, of either the same or different chemical elements
Compound Molecule Two or more molecules
Chemical Equation Shorthand form for writing what reactants are used and what products are formed in a chemical reaction; sometime shows whether energy is produced or absorbed
Chemical Reaction Process that produces chemical change, resulting in new substances that have properties different from those of the original substances
Reactants (in a chemical equation) Substance that exists before a chemical reaction begins
Products (in a chemical equation) Substance that forms as a result of a chemical reaction
Coefficient (in a chemical equation) A number that is constant for a given substance, body, or process under certain specified conditions, serving as a measure of one of its properties
Subscript (in a chemical equation) Also called subfix. any character, number, or symbol written next to and slightly below another
Created by: d0402774



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