What’s the MATTER:
Classify Changes of Matter
Matter,
Classify Changes of Matter
At the conclusion of our time
together, you should be able to:
1. Characterize various changes of matter
2. Recognize that a change of state in
matter is a physical change
Interesting Signs:
Physical Change
Physical
A change in matter from one form
to another without changing its
chemical properties
(most can be reversed)
No change in atoms/molecules
Physical Change
 Examples =
 Change in state or phase change
 Dissolving
 Compressing
 Light emission/absorption
 Electrons passing through metals
Physical Change
More Examples =
 boiling of a liquid
 melting of a solid
 dissolving a solid in a
liquid to give a
homogeneous mixture
 making a solution
2
1
Chemical Change
Chemical
Bonds are made / broken
Change in oxidation states
Cl-1
Cl-1
Li
+1
Examples of Chemical Change
•Burning hydrogen (H2) in oxygen
(O2) gives H2O.
 Chemical change or chemical
reaction — transformation of
one or more atoms or
molecules into one or more
different molecules.
Sure Signs of a Chemical Change
 Heat
 Light
 Gas Produced
(not from boiling!)
 Precipitate – a
solid formed by
mixing two liquids
together
Will This be on the
Test????
Remember the Law of Conservation
of Mass
 In a physical change or a chemical
reaction, mass is neither created or
destroyed
(Antoine Lavoisier)
Matter,
Classify Changes of Matter
Let’s see if you can:
1. Characterize various changes of matter
2. Recognize that a change of state in
matter is a physical change
Physical vs. Chemical Change
 Examples:
 melting
physical
 flame produced
chemical
 paper cut
physical
 dissolving salt
physical
in water
 tarnishes in air
chemical
Physical vs. Chemical Change
 Examples:
 rusting iron
chemical
 mixing mud and
physical
water
 burning a log
chemical
 freezing water
physical
 grinding spices
physical
 A difference between physical
change and chemical change is that
1. chemical change involves energy while
physical change does not.
2. physical change involves energy while
chemical change does not.
3. different kinds of molecules are present
after a physical change but not after a
chemical change.
4. different kinds of molecules are present
after a chemical change but not after a
physical change
In making a pizza,
which process involves
a chemical change?
1. Mixing spices for the
sauce
2. Slicing pepperoni for
the topping
3. Spreading cheese on
the pizza
4. Baking the dough to
form the crust
All You Really Need To Know
You Can Learn From Noah's Ark
11.Remember that the ark was built by
amateurs; the Titanic was built by
professionals.
12.Remember that woodpeckers inside are
a larger threat than the storm outside.