1. Introduction to Chemistry

2. A Story of Two Substances

3. What Is Chemistry?
Chemistry can be defined as the study of matter and the changes it undergoes.
Chemistry is often called the central science.

5. The Ozone Layer

6. Formation of Ozone Destruction of Ozone
See Figure 3 on page 6 for the formation
Destruction of Ozone

8. Substance – Matter that has a definite and uniform composition.

9. Chlorofluorocarbons First synthesized in 1928 by Thomas Midgley Jr.
CFC is a substance that consists of chlorine, fluorine, & carbon.
CFC’s were first considered to be safe.
However by the 1970’s scientists were detecting the presence of CFC’s in the atmosphere.