1. “Introduction to Chemistry”

2. What is Chemistry? Chemistry is the study of the composition of “matter” – (matter is anything with mass and occupies space), its composition, properties, and the changes it undergoes. Has a definite affect on everyday life - taste of foods, grades of gasoline, etc. Living and nonliving things are made of matter.

5. What is Chemistry? Pure Chemistry Applied chemistry

6. Why Study Chemistry? Everyone and everything around us involves chemistry – explains our world What in the world isn’t Chemistry? Helps you make choices; helps make you a better informed citizen A possible career for your future Used to attain a specific goal What did we describe as “pure” and “applied” chemistry?

7. Chemistry Far and Wide Chemists design materials to fit specific needs – velcro perfume, paints, nonstick cooking utensils, polyester fibers Two different ways to look at the world: macroscopic and microscopic

8. Chemistry Far and Wide Energy – we constantly have greater demands

9. Chemistry Far and Wide Medicine and Biotechnology-

10. Chemistry Far and Wide Agriculture

11. Chemistry Far and Wide The Environment

12. Alchemy – developed the tools and techniques for working with chemicals The word chemistry comes from alchemy – practiced in China and India since 400 B.C. Alchemy has two sides: – Practical: techniques for working with metals, glass, dyes, etc. – Mystical: concepts like perfection – gold was a perfect metal

13. Lavoisier In the late 1700s, Antoine Lavoisier helped transform chemistry from a science of observation to the science of measurement – still used today He settled a long-standing debate about burning, which was… – Oxygen was required!

14. Steps in the Scientific Method 1. Observations (uses your senses) a) quantitative involves numbers = 95 o F b) qualitative is word description = hot 2. Formulating hypotheses (ideas) - possible explanation for the observation, or “educated” guess 3. Performing experiments (the test) - gathers new information to help decide whether the hypothesis is valid

15. Law vs. Theory  A law summarizes what has happened.  A theory (model) is an attempt to explain why it happened – this changes as new information is gathered.