We can tell when a chemical reaction occurs by looking at the result. If the matter changes identity rather
than just form, then a (4). has occurred. When
this happens (5) are broken and formed. If a
substance's size, shape, or form changes then a
(6) has occurred. This happens when a change
in (7).
has happened, and the substance changes
between solid, liquid, and/or gas. This all falls under
the study of matter and how substances interact with
each other, or (8)