click below
click below
Normal Size Small Size show me how
Vocabulary-Chemistry
Chemistry
Question | Answer |
---|---|
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 |