1 Introduction to Chemistry Chapter 1 Estrada

2 Ozone Location  Stratosphere – km above Earth’s surface Formula  O 2 (g) + UV  O 3 (ozone) Ozone can absorb radiation and break up to form O 2 (g) G.M.B. Dobson  1920’s  Dobson units

3 Chlorofluorocarbon (CFC) Ammonia coolant Thomas Midgley, Jr  1928 synthesized CFCs 1935  AC, plastic foams, propellants in spray cans 1970’s noticed CFCs in atmosphere

4 Mario Molina and F. Sherwood Rowland How long can CFCs stay in the atmosphere?  Stable in troposphere  Unstable in stratosphere Conclusion: Cl attaches to ozone and breaks into O gas and Chlorine monoxide

5 Terms to Know Chemistry  The study of matter and the changes it undergoes Matter  Anything that has mass and takes up space Mass  Measurement that reflects the amount of matter Weight  Mass influenced by gravity

6 Did you know ….? Structure, composition, and behavior of all matter can be explained on a submicroscopic level

7 Some Branches of Chemistry Organic chemistry Inorganic chemistry Physical chemistry Analytical chemistry Biochemistry Theoretical chemistry Environmental chemistry

8 Scientific Method Problem Hypothesis Experiment/Procedure  Materials  Safety issues Data Conclusion

9 Terminology Qualitative data Quantitative data Independent variable Dependent variable Control

10 Do you know the difference? Theory  Ex: Atomic Theory Scientific law  Ex: Law of Gravitation

11 Types of Research Pure Applied Results  Technology

12 Credits Information from Glencoe Chemistry Images from Microsoft ClipArt and Wikipedia