1. Physical &
Chemical Changes

2. Matter changes around us all the time.
Fast - Ice Melts
Slow - Rusting

3. Click on the picture above.
BrainPop: Property Changes
Click on the picture above.

4. A change that affects only the physical properties of a substance.
Physical Change
A change that affects only the physical properties of a substance.
Physical Properties are things like
Size, Shape, & State of Matter

5. Physical Changes Start and end with same substance.
Change in shape, size, phase (states).
Can be observed without changing the composition of the substance.

6. Examples of Physical Changes
Breaking a glass.
Getting a haircut.
Karate chopping a wood board.
Adding chocolate syrup to ice cream.
Squeezing a wet sponge.

7. Key Action Words
Change shape and size: tear, break, compress, squeeze, grind, chop, grate, split, combine.
Change state: melt, freeze, boil, cool, condense, warm, evaporate.

8. Click on the picture above.
BrainPop: Matter Changing States
Click on the picture above.

9. Changes the chemical composition of a substance.
Chemical Change
Changes the chemical composition of a substance.
Evidence of Chemical Changes
A new substance forms from a chemical reaction

10. Chemical Changes Unexpected color change Unexpected odor change
Unexpected temperature change (breaking bonds)
Unexpected gas formation (bubbles)

11. Examples of Chemical Changes
Hydrogen peroxide bubbling on a wound.
Using a Thermacare heat pack on your lower back.
Activating a glow stick.

12. Chemical Changes Key Actions Words
Reacts, burns, produces, forms, creates, yields.

13. Rearrangement of atoms in reactants to form products.
Chemical Reaction
Rearrangement of atoms in reactants to form products.
Reactants
Products
Methane + Oxygen
Carbon dioxide + water
Methane bubbles

14. Energy in Reactions
1. Exothermic Reactions - energy is released, detected by a rise in temperature.
2. Endothermic Reactions - absorb energy, detected by a decrease in temperature.

15. Are these Physical or Chemical?
Let's Practice!
Are these Physical or Chemical?
Cutting an apple.
Burning a match.
Mixing Kool-aid and water.
Dissolving Alka-Seltzer in water and producing CO2 bubbles.