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Law of Conservation of Mass A relation stating that in a chemical reaction, the mass of the products equals the mass of the reactants.
Chemical Change Where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed.
Physical Change A substance doesn't change what the substance is.
Chemical Formula A representation of a substance using symbols for its constituent elements.
Element (diatomic) Molecule Molecules composed only of two atoms, of either the same or different chemical elements.
Compound Molecule A compound made of 2 or more nonmetal elements.
Chemical Equation Shorthand form for writing what reactants are used and what products are formed in a chemical reaction ; sometimes 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 form of a chemical equation) Substance that exists before a chemical reaction begins.
Products (in form of a chemical equation) Substance that forms as a result of a chemical reaction.
Coefficient (in form of a chemical equation) The number of molecules of reactants or products. 2 H2 + O2 > 2 H2O
Subscript (in form of a chemical equation) Numbers used to tell you how many atoms of an element are present in the equation. Water H20 has 2 atoms of hydrogen and one of oxygen.
Element One of a class of substances that cannot be separated into simpler substances.
Created by: sabbrinnnaaa_