Mixtures
Mixtures
á
two or
more substances mixed together that are not chemically combined
- nothing
new is created
- each substance keeps its physical properties
Types
of Mixtures
á
heterogeneous
mixtures:
o
particles
not dissolved
- test
it: can be separated by a filter
o
not
the same throughout, such as gravel and water
á
homogeneous
mixtures:
o
particles
physically dissolved
- test
it: can not be separated by
a filter
o
same
throughout, such as salt and water
Types of
Heterogeneous Mixture
á
suspensions
o
solid suspended in a
liquid
o
particles settle out
o
such as paint
á
colloids
o
homogeneously mixed but not dissolved
o
particles do not settle out
o
such as milk, whipped cream, toothpaste, and lotion
Types
of Homogeneous Mixture
á
Solutions
o
solids dissolved in
liquids
o
such as saltwater
á
Alloys
o
solids dissolved in solids
o
such as bronze
Table
salt
á
chemical
name: sodium chloride
á
chemical
symbol: NaCl
á
an
essential dietary substance
á
the
main salt in seawater
á
forms cubic crystals when it
crystallizes from evaporation
Crystals
á
the
solid form of a material
á
can be
identified by its repeating pattern or special shape
á
Examples
are salt crystals, quartz crystals, and ice crystals (snowflakes).
Diatomaceous
earth
á
the
skeletal remains of diatoms, aquatic organisms (protists) with hard shells made
of silica
á
mined
from sedimentary deposits, ground to a fine powder, and used for filters
(swimming pools), abrasives, and polishes
á
inert
(not active) but can cause irritation if it gets into the eyes and nose