Changes in temperature can cause matter to undergo a phase change from one state to another, such as melting, freezing, evaporation, or condensation as it shifts between solid, liquid, and gas forms. Physical changes alter the form of a substance but not its chemical makeup, while chemical changes result in new chemical substances forming as atomic bonds break and form.

1. CHANGES OF MATTER

2.  When temperature changes, matter can
undergo a phase change, shifting from one
form to another. Examples of
phase changes are melting (changing from a
solid to a liquid), freezing (changing from a
liquid to a solid), evaporation (changing from
a liquid to a gas), and condensation
(changing from a gas to a liquid).

4.  Physical changes are changes affecting the
form of a chemical substance, but not its
chemical composition. Physical changes are
used to separate mixtures into their
component compounds, but can not usually
be used to separate compounds into
chemical elements or simpler compounds.

6.  Chemical change is any change that results
in the formation of newchemical substances.
At the molecular level, chemical
change involves making or breaking of bonds
between atoms.These changes arechemical:
iron rusting (iron oxide forms)