Atmosphere - Chemistry Flashcards

1
Q

What is the composition for atmosphere?

A

78.1% Nitrogen
21% Oxygen
0.9% Argon
0.04% CO2

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2
Q

What are the other trace gases?

A

Neon, Helium, Methane, Krypton, Nitrous oxide etc

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3
Q

Troposphere

A

Extends from earths surface to about 11km above, being the most significant

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4
Q

Stratosphere

A

Extends from 11km to about 50km

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5
Q

What solar radiation reactions occur in the atmosphere?

A

Trace gas photolysis, and oxidizable trace gas photooxidation, and photochemical reactions.

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6
Q

What does E=hV describe?

A

The energy of a photon of visible or UV light

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7
Q

What is hV?

A

H describes plancks constant and V the frequency of electromagnetic radiation.

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8
Q

Plancks Constant

A

A universal constant defining quantum nature of energy ,rleating to photons energy and frequency.

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9
Q

Why does UV light break chemical bonds easier than visible light?

A

It has more energy.

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10
Q

What do photochemical reactions usually result in?

A

Excited State species and Free Radicals.

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11
Q

Excited State

A

A product of a photochemical reaction electrochemically more energized, chemically more reactive.

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12
Q

Free Radicals

A

Containing unpaired electrons

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13
Q

What is an example of radical formation in the atmosphere?

A

Excited state reaction with water vapour, producing two hydroxyl radicals.

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