Presentation on theme: "Welcome to Chem 108! Brian Majestic Environmental Chemistry and Technology and Department of Chemistry."— Presentation transcript:
Welcome to Chem 108! Brian Majestic Environmental Chemistry and Technology and Department of Chemistry
Syllabus Addition! Dr. Majestic’s office for office hours is in 2126 Chemistry (New wing) When I’m not at lecture or office hours, you can usually find me in the Water Science and Engineering Building (Park St at Lake Mendota)
Topics for Today Radon Elements, Compounds, and Molecules Protons and Atomic Number Noble Gases
Readings in Text 1.2 What’s in a Breath? The Composition of Air 1.14 The Inside Story of Air Quality (only the part about radon) 1.6 Classifying Matter Mixtures, Elements & Compounds 2.2 Atomic structure & periodicity
Topics for Wednesday What would you see if you were inside of the nucleus? Mass number vs atomic mass Isotopes Radon cont…
Readings in Text 1.7 Atoms & Molecules 2.2 Atomic Structure and Periodicity
Iowa has the highest U.S. average radon concentrations.
http://www.epa.gov/iaq/radon/zonemap.html Accessed January 20, 2006
Iowa Radon Study “... [total] radon exposure in the residential environment is significantly associated with lung cancer risk."... “a 15 year exposure at levels equivalent to EPA's action level of 4 pCi/L yielded excess an increase in lung cancer risk of 83% for total cases” * NOTE: pCi / L is read as “pico curie per liter”
More than 4 picocuries per liter. How much radon is harmful…?
“radon, a radioactive gas found in the earth’s soil, is the second leading cause of lung cancer”radon Results in 21,000 excess deaths every year (US EPA). http://www.lunghelpline.org/HelpLine/lungcancer/causes.asp
What about where you live? Maximum levels of Rn exposure set by the EPA is 4 pCi / L air.
What about where you live? For typical radon levels, about 1 radioactive decay from radon every 7 seconds