Ozone Depletion and CFCs

The video explains the ozone layer's role in protecting Earth from UV rays and discusses the causes of its depletion, focusing on chlorofluorocarbons (CFCs). It covers the chemical reactions involving CFCs that lead to ozone depletion and highlights regulatory actions like the Montreal Protocol. The video also provides additional facts and visual aids to enhance understanding.

What is the primary function of the ozone layer in the stratosphere?

• To trap heat from the sun

• To protect against ultraviolet rays

• To absorb carbon dioxide

• To produce oxygen

Which compound is primarily responsible for ozone depletion?

• Nitrous oxide

• Chlorofluorocarbons

• Methane

• Carbon dioxide

What was a major source of CFC emissions in the past?

• Wind turbines

• Solar panels

• Electric cars

• Refrigerators and air conditioners

What international agreement led to the banning of CFCs?

• Kyoto Protocol

• Paris Agreement

• Montreal Protocol

• Geneva Convention

How long can CFCs remain in the atmosphere?

• 10 to 50 years

• 1 to 5 years

• 500 to 1000 years

• 65 to 385 years

What role does UV radiation play in the reaction involving CFCs?

• It breaks apart CFC molecules

• It creates new CFC molecules

• It forms new ozone molecules

• It neutralizes chlorine atoms

What is the result of chlorine reacting with ozone?

• Creation of water vapor

• Production of chlorine monoxide and oxygen gas

• Formation of carbon dioxide

• Emission of methane

What effect do stratospheric clouds have on ozone depletion?

• They accelerate the reaction

• They have no effect

• They slow down the reaction

• They stop the reaction completely

Which of the following is NOT a property of CFCs?

• Flammable

• Corrosive

• Odorless

• Toxic

What trend is observed in the ozone levels from 1970 to 2010?

• A rapid increase

• No change

• A significant decrease

• A slight increase