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.
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.
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.
Which layer of the atmosphere contains the highest concentration of ozone?
(1) Troposphere
(2) Stratosphere
(3) Mesosphere
(4) Thermosphere
Which of the following best describes the function of the ozone layer?
(1) It traps greenhouse gases
(2) It reflects visible light
(3) It absorbs harmful ultraviolet radiation
(4) It produces oxygen for breathing
Which of the following compounds is primarily responsible for ozone layer depletion?
(1) Carbon dioxide
(2) Methane
(3) Chlorofluorocarbons (CFCs)
(4) Nitrogen gas
Which of the following gases does NOT contribute to ozone depletion?
(1) Nitrous oxide
(2) CFCs
(3) Oxygen
(4) Halons
Fill in the blank: The breakdown of ozone by chlorine atoms is an example of a ________ reaction.
Fill in the blank: The main source of chlorine in the stratosphere is the breakdown of ________.
Fill in the blank: The process by which ozone is broken down by UV light is called ________.
Fill in the blank: The region over Antarctica where the ozone layer is severely depleted is commonly called the ________.
True or False: Halons, used in fire extinguishers, are also ozone-depleting substances.
True or False: Ozone depletion only affects the polar regions.
True or False: Ozone is beneficial in the troposphere but harmful in the stratosphere.
True or False: Ozone layer depletion leads to an increase in skin cancer rates among humans.
