This document discusses different types of changes in matter, including physical changes which do not alter the substance's composition, changes in state from solid to liquid to gas or vice versa depending on temperature, and chemical changes which produce new substances through irreversible reactions. It also defines pure substances, mixtures, heterogeneous and homogeneous mixtures, and other key chemistry terms.

2.  Physical changes: changes in the form or
appearance of matter. These changes do not
affect the substance that the matter is made
of.
 Changes in state: the transformations when
matter changes from one physical state to
another because of a change in temperature.

3. The boiling point is the temperature at which
liquid changes to a gas.

4. Pure substances Mixtures
 They have only one
component.
 A combination of two
or more components.

5.  Heterogeneous Homogeneous

6. Magnetism Filtration
Decantation Evaporation

7.  Changes in the composition of a substance.
The majority of chemical changes are
irreversible.

8. Simple Pure Substances Compounds
 They consist of one
element or type of
matter.
 They consist of two or
more elements.

9. oxidation conductivity
 Oxygen combines with
substances to form
new substances.
 A type of oxidation.
Combustion produces
light and heat in the
form of fire.