Chapter 1: Introduction to Chemistry Section 1.1 –The Stories of Two Chemicals.

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Presentation transcript:

Chapter 1: Introduction to Chemistry Section 1.1 –The Stories of Two Chemicals

The Ozone Layer The ozone layer allows living things to exist on Earth It absorbs harmful UV light

Earth’s Atmosphere

Ozone Formation Ozone = O 3 Located in the stratosphere Formed when oxygen gas is exposed to ultraviolet radiation Oxygen gas  Oxygen particles –Oxygen particles + Oxygen gas  Ozone

Ozone Formation Formed in upper stratosphere Stored in the lower stratosphere

G.M.B. Dobson Began measuring ozone in the 1920s Normal = 300 DU 1981: ozone recorded at 160 DU over Antarctica

What is the DU? The most basic measure used in ozone research. 'Dobson Spectrometer' - measures the intensity of solar UV radiation at four wavelengths, two of which are absorbed by ozone and two of which are not. 1 Dobson Unit (DU) is defined to be 0.01 mm thickness at STP

The DU

The Ozone is thinning!!

The Ozone “Hole” Over Antarctica

The Ozone Hole Over Time

Chlorofluorocarbons Thomas Midgley synthesized them in 1928 CFC = Cl + F+ C Not naturally occurring Nontoxic, stable Ideal coolant for refrigerators Great propellant for spray cans

CFC in the Atmosphere CFC was discovered in the atmosphere in the 1970s Its presences increases every year

The Tale of Two Chemicals Ozone CFC