Ozone Depletion

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (24)

Front (Question)

Reactions between UV radiation and oxygen: UVC

Back (Answer)

UVC + O2 —> O + O

Front (Question)

Reactions between UV radiation and oxygen: UVB

Back (Answer)

UVB + O3 —> O2 + O

Front (Question)

Reactions between monatomic and diatomic oxygen

Back (Answer)

O + O2 —> O3 + heat

Front (Question)

Dynamic equilibrium

Back (Answer)

a combination of active processes that cancel out each other’s effects so that there is no overall charge

Front (Question)

Effects of UVB on living organisms

Back (Answer)

skin cancer, causes cataracts, damages leaf tissue

Front (Question)

What pollutant gas contains chlorine?

Back (Answer)

chlorofluorocarbons

Front (Question)

Properties of CFCs

Back (Answer)

non - toxic inflammable

Front (Question)

History of CFCs

Back (Answer)

Anthropogenic Created due to methyl chloride accidents 1974 - discovered that CFCs were responsible for ozone depletion 1987 - 27 nations signed the Montreal Protocol

Front (Question)

Sources of CFCs

Back (Answer)

refrigerators air con propellants paints fire extinguishers

#10

Front (Question)

What was the Rowland-Molina principle?

Back (Answer)

1974 paper CFCs are broken down by UV in stratosphere to form halogen free radicals, which catalytically react with ozone

#11

Front (Question)

Depletions - Cl

Back (Answer)

Cl + O3 —> ClO + O2 slows O3 formation

#12

Front (Question)

Depletions - ClO

Back (Answer)

ClO + O —> Cl + O2 Cl is released, breaks down more ozone

#13

Front (Question)

Why is ozone depletion greatest at polar regions?

Back (Answer)

cold temp polar vortex winds above poles prevent air from mixing and spreading stratospheric clouds - contain ice crystals which allow for more reactions that release Cl

#14

Front (Question)

What other gases cause ozone depletion?

Back (Answer)

bromine, iodine, fluorine HCFCs

#15

Front (Question)

What is ozone measured in?

Back (Answer)

Dobson Unites (DU)

#16

Front (Question)

100 DU =

Back (Answer)

1mm of O3

#17

Front (Question)

What is the regular level of ozone?

Back (Answer)

300 DU

#18

Front (Question)

What level is considered as a hole in the ozone layer?

Back (Answer)

below 220 DU

#19

Front (Question)

Atmospheric monitoring - helium balloons/UAVs

Back (Answer)

samples are collected and analysed from the air

#20

Front (Question)

Atmospheric monitoring - ground based surveys

Back (Answer)

measures UV reaching Earth’s surface more UV = less O3

#21

Front (Question)

Atmospheric monitoring - satellites

Back (Answer)

measure reflected UV and re-emitted IR from Earth’s surface

#22

Front (Question)

What does the Montreal Protocol regulate?

Back (Answer)

the consumption of ozone depleting substances (ODS)

#23

Front (Question)

Who was the Montreal Protocol signed by?

Back (Answer)

all 198 UN member states

#24

Front (Question)

What was agreed in the Montreal Protocol?

Back (Answer)

all nations had equal responsibilities (e.g. controlling ODS trade) timeline of change was longer for less economically developed countries (LEDCs)