Question | Answer |
Physical Change | a usually reversible change in the physical properties of a substance, as size or shape |
Law of Conservation of Mass | a fundamental principle of classical physics that matter cannot be created or destroyed in an isolated system |
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 | one of a class of substances that cannot be separated into simpler substances by chemical means. |
Chemical Formula | a representation of a substance using symbols for its constituent elements |
Element (Diatomic) Molecule | Diatomic molecules are 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 | A chemical equation is symbolic representation of a chemical reaction where the reactant entities are given on the left hand side and the product entities on the right hand side. |
Chemical Reaction | A process that involves rearrangement of the molecular or ionic structure of a substance, as opposed to a change in physical form or a nuclear reaction |
Reactants | A substance that takes part in and undergoes change during a reaction |
Coefficient | a multiplicative factor in some term of an expression (or of a series); it is usually a number |
Subscript | a number, figure, symbol, or indicator that appears smaller than the normal line of type and is set slightly below or above it |