1. Physical Change or Chemical
Change?

2. Physical and chemical change
caused by 4 different things…
 Heat
 Mixing
 Electricity
 Light

3. Heat
Physical Change Chemical Change
Expansion or contraction due to heat
gain or heat lost
Combination (2 things>1 compound)
Changes of states (boiling, melting…) THERMAL Decomposition (1 complex
compound>2 things)
- Combustion (same as combination, but
must involves OXYGEN ATOMS)
Oxygen+Sulfur = Sulfate

4. Mixing
Physical Change Chemical Change
Dissolving (Making a solution) Metal + acid= Salt+ Hydrogen
Making a suspension Carbonates + Acids= Salt+ Water +
Carbon Dioxide
- Ammonia Salts + Alkaline= Salts +
Water + ammonia gas
- Acid + Alkaline= Salts + Water
- Precipitation Reaction is the mixing
of TWO solutions to produca a
SOLID
E.G
CO2 + Calcium

5. Electricity
Physical Change Chemical Change
Heating effect of the current Electrolysis
Magnetic effect of the current
(electromagnets)
Electric cells (batteries)

6. LIGHT
Physical Change Chemical Change
- Photosynthesis
- Photography (using SILVER BROMIDE)
- Skin (melanin) <under the sun for too
long and you skin turns dark,yea.