BI SCI 003 Exam 2 Review

BI SCI 003 Exam 2 Review - B I SC I 003 Exam 2 Review...

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BI SCI 003 Exam 2 Review Ozone (O3) – a molecule made up of three oxygen atoms (O3) Oxygen atom sunlight comes in breaks up into two oxygen floating O2 interacts with just one -over time reactions that create and break down ozone came into a dynamic equilibrium Result: The Ozone Layer -a small residual amount of ozone concentrated in a band high in the stratosphere The equilibrium is delicate; -For every 10 million molecules of air, 2 million are O2, and only 3 are ozone -this small amount of ozone is enough to prevent most UV-B radiation from reaching the surface of the earth What have humans done to the ozone layer? -damaged ozone layer by adding molecules containing chlorine orbromine that lend to ozne destruction? Chlorofluorocarbons (CFC) -at ground level, molecules are stable, have industrial and domestic applications -when released, drift up to the stratosphere, pushed by winds and atmospheric mixing -at high altitude, energetic light rays break them down and liberating an atom of chlorine -This chlorine atom can react with ozone and break it down to chlorine oxide and O2 -chlorine oxide will break down as well -releases the Cl atom to go on destroying ozone -one Cl atom to go on destroying ozone
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-one Cl atom can destroy up to 10,000 ozone molecules The “hole” in the ozone layer – actually a thinning of the ozone layer - A hole opens up above Antarctica each spring – up to 2.3 million square miles
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This note was uploaded on 10/31/2010 for the course BISCI 003 at Penn State.

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BI SCI 003 Exam 2 Review - B I SC I 003 Exam 2 Review...

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