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How does chlorine destroy ozone?

How does chlorine destroy ozone?

Ozone Depletion. When chlorine and bromine atoms come into contact with ozone in the stratosphere, they destroy ozone molecules. One chlorine atom can destroy over 100,000 ozone molecules before it is removed from the stratosphere. Ozone can be destroyed more quickly than it is naturally created.

What are the principal steps in stratospheric ozone depletion caused by human activities?

The stratospheric ozone depletion process begins with the emission of halogen source gases by human activities and natural processes. Those emitted by human activities are also called ozone-depleting substances (ODSs). Subsequent steps are accumulation, transport, conversion, chemical reaction, and removal.

What chemicals destroy the ozone layer?

Ozone depleting substances

  • chlorofluorocarbons (CFCs)
  • halons.
  • carbon tetrachloride (CCl4)
  • methyl chloroform (CH3CCl3)
  • hydrobromofluorocarbons (HBFCs)
  • hydrochlorofluorocarbons (HCFCs)
  • methyl bromide (CH3Br)
  • bromochloromethane (CH2BrCl)

Why is chlorine an efficient ozone destroyer?

The net result of Cycle 1 is to convert one ozone molecule and one oxygen atom into two oxygen molecules. In each cycle, chlorine acts as a catalyst because ClO and Cl react and are re-formed. In this way, one Cl atom participates in many cycles, destroying many ozone molecules.

What is the first step in the destruction of ozone?

The initial step in the depletion of stratospheric ozone by human activities is the emission, at Earth’s surface, of ozone-depleting gases containing chlorine and bromine. Most of these gases accumulate in the lower atmosphere because they are unreactive and do not dissolve readily in rain or snow.

What are the chemicals that damage the ozone layer 1 marks ans cites CFCs PCBS DDT?

The chemicals responsible for ozone layer destruction are:

  • Chlorofluorocarbons: Chlorofluorocarbons (CFCs) are non-toxic, non-flammable chemicals containing atoms of carbon, chlorine, and fluorine.
  • Halogens: Ozone is destroyed by reactions with chlorine, bromine, nitrogen, hydrogen, and oxygen gases.

Which is responsible for ozone depletion?

chlorofluorocarbons (CFCs)
Ozone depletion occurs when chlorofluorocarbons (CFCs) and halons—gases formerly found in aerosol spray cans and refrigerants—are released into the atmosphere (see details below).

What are the chlorine and bromine reactions that destroys stratospheric ozone?

Stratospheric ozone is destroyed by reactions involving reactive halogen gases, which are produced in the chem- ical conversion of halogen source gases (see Figure Q8-1). The most reactive of these gases are chlorine monoxide (ClO), bromine monoxide (BrO), and chlorine and bromine atoms (Cl and Br).

What are two steps are being taken to prevent the ozone layer depletion?

How can we protect the ozone layer?

  • Avoid the consumption of gases dangerous to the ozone layer, due to their content or manufacturing process.
  • Minimize the use of cars.
  • Do not use cleaning products that are harmful to the environment and to us.
  • Buy local products.

What chemicals does the Montreal Protocol control?

The Montreal Protocol sets binding progressive phase out obligations for developed and developing countries for all the major ozone depleting substances, including chlorofluorocarbons (CFCs), halons and less damaging transitional chemicals such as hydrochlorofluorocarbons (HCFCs).