1. What Are Chemical Changes in Matter?

2. Physical properties vs. Chemical properties
yellow, thin, has six sides, etc.
burns in the presence of oxygen at about 660˚F

3. physical property
A trait of a substance not involving an interaction with another substance.

4. Water made up of hydrogen and oxygen
colorless, odorless, boils at 100˚C, melts at 0˚C
made up of hydrogen and oxygen
Physical
Chemical

5. Sulfur reacts with oxygen to form sulfur dioxide dull, brittle, yellow
Chemical
Physical

6. Remember boiling isn’t always hot & freezing isn’t always cold.
Oxygen boils at -180˚C (very cold)
Wax freezes at 45˚C (113˚F)

7. Chemical change: a change that results in one or more new substances.
1886: copper
today: copper carbonate

8. compound
A substance made of two or more elements that have chemically combined.

9. Law of Conservation of Mass: matter cannot be created or destroyed (only changed).
Antoine Lavoisier
vinegar + baking soda = gas