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Physical and Chemical Properties: Formulating Matter

Learn about physical and chemical properties of materials, including examples and changes they undergo. Also, explore the composition of pennies and the use of toxic elements in everyday products.

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Physical and Chemical Properties: Formulating Matter

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  1. Warm Up: 1)

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

  3. Have you heard of Aerogel!? • https://www.youtube.com/watch?v=kHnen2nSmDY

  4. 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.

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

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

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

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

  9. 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

  10. Examples of Chemical Changes

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

  12. Money Project • http://www.schooltube.com/video/600f319c82e707972477/How-its-Made-Coins • http://www.history.com/shows/modern-marvels/videos/coin-production (Coins) • http://www.history.com/shows/modern-marvels/videos/making-money (Paper Bills)

  13. 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?

  14. 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?

  15. 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. PolicyINVESTIGATIVE 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?

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