p.
Mixtures
Variable
combination of 2 or more
pure substances.
Heterogeneous –
Homogeneous –
visibly separate, different parts Same throughout
prefixes
Homo
– same
Hetero - different
Heterogeneous V.S.
Homogenous
Heterogeneous mixtures
Each substance can have
different properties
Vegetable soup contains
different substances with
different properties in
different concentrations.
Example: more carrots than
peas with uneven
distribution throughout
the mixture (soup).
Homogenous mixtures
Contain more than one
substance.
Substances are mixed and
distributed evenly
throughout the mixture.
When mixed are difficult to
see or separate out.
Example: sugar and tea, once
mixed the sugar is
dissolved and evenly
distributed in the mixture.
We call a mixture of two or
more substances that
looks identical throughout
a Solution.
Homogeneous Mixture
Solution-contains a solvent and
at least one solute. (Solutes and
solvents can be gas, liquid, or
solid)
Heterogeneous Mixtures
Colloid-contains larger particles
than a solution.
Supsension-a mixture in which
particles can be seen and easily
separated by settling or filtration.
REVIEW-Comparing Mixtures
and Compounds
Mixtures
1. Substances remain
the same; no
chemical bonding
occurs.
2. Can be separated by
physical means.
3. Proportions of
different substances
in a mixture can vary
throughout the
mixture or from
mixture to mixture.
Compounds
1.
2.
3.
4.
New substances formed
by atoms that bond
together
Can only be separated
by breaking atomic
chemical bonds.
Proportions of different
substances are in a
compound are fixed.
The type and number of
atoms in a compound are
always the same.
Mixtures of Matter
Separating
Mixtures: a compound can be
difficult to separate into its elements, but a
mixture is usually easy to separate into its
components because each component
keeps its own properties
Separation Methods: magnetic attraction,
filtration, distillation, and evaporation
Matter Flowchart
yes
yes
Is the composition
uniform?
Can it be physically
separated?
no
yes
no
Can it be chemically
decomposed?
no
Matter Flowchart
MATTER
yes
MIXTURE
yes
Is the composition
uniform?
Homogeneous
Mixture
(solution)
PURE SUBSTANCE
no
Heterogeneous
Mixture
Colloids
no
Can it be physically
separated?
yes
Can it be chemically
decomposed?
Compound
Suspensions
no
Element