Ozone Layer Depletion
Chemistry ⇒ Environmental Chemistry
Ozone Layer Depletion starts at 10 and continues till grade 12.
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See sample questions for grade 11
Calculate the number of oxygen atoms in one molecule of ozone.
Context: In a laboratory experiment, a student observes that UV light causes a decrease in the concentration of ozone in a sealed container. Explain the chemical process responsible for this observation.
Describe one environmental impact of ozone layer depletion on aquatic ecosystems.
Describe one natural process that leads to the formation of ozone in the stratosphere.
Describe the catalytic cycle by which chlorine destroys ozone in the stratosphere.
Explain the role of chlorine atoms in the destruction of ozone molecules in the stratosphere.
Explain why CFCs are so persistent in the atmosphere.
Explain why ozone depletion is considered a global environmental issue.
Explain why the use of methyl bromide is regulated under the Montreal Protocol.
Name the international agreement signed in 1987 to phase out the production of ozone-depleting substances.
State one reason why the ozone hole is most prominent over Antarctica.
Context: A country has banned the use of CFCs but continues to use HCFCs as refrigerants. Discuss the environmental implications of this policy in relation to ozone layer protection.
Context: Scientists have observed that the rate of ozone depletion increases during the Antarctic spring. Explain the chemical and physical reasons for this seasonal variation.
Describe the impact of ozone layer depletion on the rate of photosynthesis in terrestrial plants and explain the underlying reason.
Explain why the recovery of the ozone layer is a slow process, even after the reduction of ozone-depleting substances.
Explain, using chemical equations, how nitrogen oxides (NO and NO2) can catalytically destroy ozone in the stratosphere.
