1. Warm Up: 1)

2. Physical and Chemical Properties
UNIT 1: Materials – Formulating Matter
Physical and Chemical Properties

4. Have you heard of Aerogel!?

5. Physical Properties
Used to describe substances without altering the chemical makeup of the material.
Examples: Color, density, odor, melting & boiling points, viscosity, malleability, conductivity, etc.

6. Physical Properties
Example: Physical Properties of post-1982 and pre-1982 pennies.

7. Chemical Properties
Describes how or if a substance reacts with other substances
Often determine a substances usefulness

8. Some of the chemical properties you tested during lab included: -reaction to oxygen -reaction to acids & bases -reaction to copper

10. Physical Change Material remains the same
Form, or state of matter (gas, liquid, solid) may have appeared to change
Change may be reversible

11. Chemical Change
Chemical bonds are made and/or broken to make a new substance with a different chemical makeup (formula), and different physical/chemical properties.
Change is permanent and not reversible
Evidence (observations) for chemical change:
Combine with oxygen, get a permanent color change like browning of an apple or rust
Detect by formation of a new liquid or gas, temperature change

12. Examples of Chemical Changes

13. What chemical changes did you observe in the lab?

14. Money Project
(Coins)
(Paper Bills)

15. A.4 Designing the penny
Read A.4 and discuss why the composition of the penny has changed over time.
What are important chemical and physical properties of the current penny?

16. On a separate piece of paper, complete the following questions: Make sure to explain your reasoning, or show mathematically how you arrived at your conclusion.
The density of pre-1982 pennies is 8.8 g/cm3. The density of pure copper is 8.94 g/cm3. The density of pure zinc is 7.14 g/cm3. Based on this information, what do you think was the relative composition of pre-1983 pennies? (For instance, do you think pennies are composed of equal amounts of coper and zinc?)
The density of pennies today is 7.2g/cm3. How do you think the composition of pennies has changed compared to pre-1982 pennies?

17. Extra Credit Go to NPR.org click on Fresh Air under Program Menu
Listen to Monday's show · NOV. 26, 2007 
Interviews: Mark Schapiro, Exposing a Toxic U.S. Policy INVESTIGATIVE REPORTER MARK SCHAPIRO EXPLAINS THAT TOXIC CHEMICALS EXIST IN MANY OF THE PRODUCTS WE HANDLE EVERY DAY — AGENTS THAT CAN CAUSE CANCER, GENETIC DAMAGE AND BIRTH DEFECTS LACING EVERYTHING FROM OUR GADGETS TO OUR TOYS TO OUR BEAUTY PRODUCTS.
*If you can’t listen on a computer in two days it will be available as a free download on iTunes
UP TO A ONE PAGE PAPER DISCUSSING:
How campaign contributions and individuals paying for health care contribute to toxic elements being used in materials such as cell phones, dvd players etc. and how will this affect the USA in the future?