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Climate Change - Atmosphere > Chemistry -Ozone Layer > Flashcards

Chemistry -Ozone Layer Flashcards

1
Q

What is ozone?

A

An atmospheric component found in the stratosphere being about 1ppm

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2
Q

What is the function of ozone?

A

Deflection of harmful UV light

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3
Q

What wavelength does ozone absorb?

A

300nm

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4
Q

What is 300nm harmful?

A

It can damage DNA

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5
Q

What are CFC;s?

A

1-2 carbon compounds containing a Cl and F , both nontoxic and stable.

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6
Q

Halons

A

Unreactive gas moecules of carbon with bromine and other halogens

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7
Q

What is the function of halons in the atmosphere?

A

Sequester H atoms that otherwise sustain combustsion reactions, by their atomic bromine

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8
Q

What happens to CFC in the ozone layer?

A

Photodecompostion by high UV radiation light, breaking the C-Cl bonds, with chlorine release

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9
Q

Stoichiochemistry of CFC breakdown?

A

Cl2CF2 + hV —> Cl + ClCF2

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10
Q

What is the negative effect of the stability of CFC?

A

Long atmospheric lifetime and undergo no degradation in the troposphere, rising to high as stratosphere

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11
Q

What do ClO radicals do in the stratosphere?

A

Dimerse for further UV breakdown with free chlorine release

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12
Q

What does chlorine do when formed in the stratosphere?

A

Degrades ozone

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13
Q

What happens do chlorine dioxide in the stratosphere?

A

Broken down by UV light, releasing diatomic oxygen and chlorine

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14
Q

What is the threshold of ozone?

A

220 Dalton uniits

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15
Q

What is the threshold of ozone based on?

A

The fact no lower measurment have been observed before 1979

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16
Q

When is the ozone hole formed?

A

Antartica at summer times.

17
Q

What happens to the closed ozone hole during the inwter?

A

Polar vortexes are induced due to so sunlight.

18
Q

What are polar vortexes composed of?

A

Molecules like HNO3, H2SO4, H2O, and HCl

19
Q

What is polar vortex HCl generated by?

A

CFC photochemical disassociation followed by hydrogen abstraction from methane

20
Q

What happens during spring when sunlight returns to antartic?

A

Chlroine can be generated from with Hcl forming photochemically reactive Cl2/HOCL

21
Q

How is ozone formed?

A

Dissassociation of O2 into elemental oxygen, each reacting with molecular oxygen to form ozone.

22
Q

Why is the ozone layer so thin?

A

Because the molecules beneath the ozone layer contain no UV light that can break O2 into O, due to its absorption by the ozone layer.

23
Q

Why is there no ozone above the ozone layer?

A

Oxygen disassoicated into O has very little molecular oxygen to combine/produce O3.

24
Q

What does ozone absorption result in?

A

Heat generation.

25
Q

Why does UV-B cause human damage?

A

Instability of cell divsion translation

Climate Change - Atmosphere (17 decks)

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