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Unformatted text preview: mp from a higher to a lower energy state. The text
explains that excited O atoms and N2 ions are produced in the ionosphere when protons from solar flares are
ejected from the Sun and eventually collide with molecules in the ionosphere.
+ N2 + energy → N2 * + e–
O2 + energy → 2O*
The green and red colors seen in the auroral displays are emitted by O* atoms, and the blue and violet colors are
emitted by N2 * ions. The symbols contain an asterisk to indicate excess energy.
During the emission process excited atoms (denoted by an asterisk) drop to the ground state and emit
photons (h ν ).
O* → O + hν
N2 * → O + hν
The auroral displays occur near the Earth's poles because solar protons are attracted there by Earth's magnetic
3. What is nitrogen fixation. Write an equation for an example.
Name the regions of the atmosphere in order of increasing altitude. What region has dramatic weather
a. What chemical species emits green and red light in auroral displays?
b. What chemical species emits blue and violet light in auroral displays? DEPLETION OF THE OZONE LAYER
2. Write the steps in the mechanism of ozone formation.
Write chemical equations describing the destruction of ozone in the stratosphere. The Ozone Layer. Ozone (O3 ) is a gas that is present in the atmosphere in a layer or shell that extends
around the entire Earth called the "ozone layer." This layer is centered in the stratosphere about 25 km above the
Earth's surface. Ozone molecules have the ability to absorb some of the ultraviolet (UV) light present in
sunlight. It is in this way that the ozone layer protects life on Earth from some of the harmful effects of
sunlight. Ultraviolet light causes skin cancer and eye damage in humans and mutations in plants. Back Forward Main Menu TOC Study Guide TOC Textbook Website MHHE Website 3 58 / Chemistry in the Atmosphere
The term "ozone layer" is misleading because it may imply that the layer...
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- Spring '08