Chapter 3 part 1 - Chemistry in Context Chapter 3 The...

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1 healthandenergy.com/ global_warming_cartoons.htm Chemistry in Context Chapter 3 The Chemistry of Global Warming Introduction • What is global warming? • Is the Earth experiencing a warming trend? Is the warming trend excessive, due to humankind? • What evidence do we have and how reliable are the data? • What molecules cause global warming? How? • What are the implications of a rise in Earth’s average temperature? Chemistry Topics • Electromagnetic spectrum • Molecular Shape • Bond stretches, bends • IR spectra • Quanta • Moles, Molecular Weight, Avogadro’s Number
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2 Categories I. Is the Earth warming? II. Are mankind’s actions causing the Earth to warm more than it would naturally? III. What are the effects of a warmer Earth? Electromagnetic Spectrum • Form groups, if desired • Use textbook as needed – Hint: use Index E-M Spectrum and Global Warming • The Earth is the third planet from the sun. Given our distance, our average surface temperature should be 0 o F. • In addition, our days should be much warmer and our nights much colder than that average temperature. • What is responsible?
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3 History • Fourier, 1800: “hothouse” – First idea that Earth’s atmosphere might play a role in trapping Sun’s heat • Tyndall, ~1860 – Demonstrated that CO 2 and H 2 O vapor absorb heat radiation • Arrhenius ~1890s – Predicted problems from CO 2 ,calculations • Revelle, 1957 – Greenhouse gases Earth’s Energy Balance asd-www.larc.nasa.gov/ erbe/ASDerbe.html Greenhouse Effect • “Process by which atmospheric gases trap and return a major portion of the heat (IR) radiated by the Earth.”
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This note was uploaded on 05/10/2008 for the course CH 304k taught by Professor Walker during the Spring '08 term at University of Texas at Austin.

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Chapter 3 part 1 - Chemistry in Context Chapter 3 The...

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