1. Unit Matter
Changes of Matter

2. Physical Changes These are changes in size, shape appearance, etc.
Critical to observe that there is no change in chemical identity.
You still have the same stuff !!!

3. Chemical Changes
These are changes in size, shape, appearance, etc, WITH changes in the chemical identity of the system.
YOU GET NEW STUFF !!!!!

4. Chemical Changes notes…
Five ways to tell that a chemical change is occurring are:
Heat
Light
Electricity
Bubbles
Formation of a precipitate.

5. Chemical Changes notes…
Five ways to get a chemical change to occur are:
Heat
Light
Electricity
Dissolve in Water
Use a Catalyst

6. Chemical Changes notes…
“Chemical change “ = “Chemical Reaction”
Must remember that all chemical reactions obey the Law of Conservation of Mass.

7. The Law of Conservation of Mass
States that matter is neither created or destroyed during chemical reactions.
“All of the atoms that enter a reaction as reactants will exit that reaction as products”
They will be bonded differently as products than they were as reactants…

8. A Chemical Equation to Illustrate the Law of Conservation of Mass
2 C4H O CO H2O
On the left side of this reaction:
8 atoms of carbon
20 atoms of hydrogen
26 atoms of oxygen
On the right side of this reaction:
8 atoms of carbon
20 atoms of hydrogen
26 atoms of oxygen

9. Nuclear Changes
These are changes to the internal structure of the atoms.
The bottom line here is that the atoms of one element actually become
atoms of a different element.

10. Your task…..
You need to be able to classify a given description of a change as a
Physical Change
Chemical Change
Nuclear Change