1. Unit 1 Lecture 2: Physical and Chemical Changes
The student is able to evaluate the classification of a process as a physical change, chemical change, or ambiguous change based on observation and understanding of covalent and non-covalent interactions.

2. Physical Property
Characteristic that can be observed or measured without changing the identity of a sample (color, density, luster, covalent/ionic nature, etc.)

3. Chemical Property
Ability of a sample to undergo changes that transforms it into a different substance (ability to rust, reactivity, ability to form a precipitate, etc)

4. Types of Properties
Intensive – Does not depend on the amount of matter present
Melting point, Boiling point, Density, Conductivity, Ability to transfer Energy as heat
Extensive – Depends on the amount of matter present
Volume, Mass, Amount of Energy in a Sample

5. Physical Change
Change in a substance that does not change the identity of the substance
Grind, cut, melt, boil, freeze, condense

6. Chemical Change
Change in which one or more substances are converted into different substances
Burn, Rot, Decompose, Ferment, Explode, Corrode

7. Clues that a Chemical Change has Occurred:
Transfer of Energy
Change in Color
Gas Produced
Precipitate Formed

8. Electrolyte
Ionic compound whose aqueous solution and conducts electricity because it dissociates.

9. Demo
Sugar and Salt Solutions pHet (Conductivity)

10. Exit Pass:
Independently sort the examples into Physical or Chemical Changes.