Transcript Classification of Matter

Classification of Matter
Chapter 2
Composition of Matter
Substance: Matter that is either an
element or a compound.
Element
Matter made up of identical atoms.
O2
Ne
H2
Ar
Composition of Matter
Compounds: Matter made from
atoms of two or more elements.
CO2
H2 O
Fe2O3
C6H12O6
Elements and Compounds
cannot be reduced to more
basic components by
physical processes.
Mixtures
A material made up of two or
more substances that can be
separated by physical means.
Salt Water
60% Cotton 40% Polyester
Heterogeneous Mixture
A mixture in which different
materials can be easily
distinguished.
Polyester- Cotton
Concrete
Pizza
Salad Dressing
Homogeneous Mixture
A material in which two or more
substance are uniformly spread
apart. (Also known as a Solution!!!)
Salt Water
Soda
Colloids
A heterogeneous mixture that
never settles.
Milk
Jello
Suspensions
A heterogeneous mixture
containing a liquid in which
visible particles settle.
Muddy Water
Salad Dressing
Comparing Solutions, Colloids, and Suspensions
Description
Solution
Colloid
Suspension
Settle upon
standing
Separated with
filter paper
No
No
Yes
No
No
Yes
Scatter Light
No
Yes
Yes
Particle Size
0.1-1nm
1-100nm
>100nm
The
Colloid
Connection
Aluminum
Hydroxide
Sand
Oxygen
and
Chlorine
Coagulation
In coagulation, small, suspended
particles are attracted to each
other. They clump together,
forming a particle that is to
big to remain suspended.
+
-
Homework: 9-1
SWUP:9-1,9-2
Pg:250-3
Due: 1/31/06
Describing Matter
Physical Properties
Any characteristic of a material
you can observe without changing
the substances that make
up the material.
Color
Size
Shape
Density
Boiling point
Melting point
…..
Physical Change
A change in the physical property
of a material.
Chemical Property
A characteristic of a substance that
indicates whether it can undergo a
certain chemical change.
Weathering
Rusting
Burning
Chemical Change
A change of on substance in a
material to a completely
different substance.
H2O
H2 + O2
Fe + O2
Fe2O3
Law of Conservation of Mass
Antoine-Laurent Lavoisier
Law of Conservation of Mass
Marie-Anne Lavoisier
Law of Conservation of Mass
Law of Conservation of Mass
Matter is neither created
nor destroyed
in a
chemical reaction.
The mass of all substances present
before a chemical reaction
EQUALS
the mass of all substances remaining
after a chemical reaction!!!
m
before
H2 0
=
m
after
H2 + 0 2
Homework: 9-2
Sect: 9-3 Wrap-Up
Page 261
Voc.1-10
Page:265
Due: 2/16/05
Homework: 9-3
Review 1-25
Pg:266-7
Due: 2/4/04
Test: 2/6/04