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How do CFCs deplete the ozone layer?

Once in the atmosphere, CFCs drift slowly upward to the stratosphere, where they are broken up by ultraviolet radiation, releasing chlorine atoms, which are able to destroy ozone molecules. When sunlight returns in the spring, the chlorine begins to destroy ozone.

How do CFCs cause ozone depletion?

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). CFCs and halons cause chemical reactions that break down ozone molecules, reducing ozone’s ultraviolet radiation-absorbing capacity.

Do CFCs deplete ozone?

Gaseous CFCs can deplete the ozone layer when they slowly rise into the stratosphere, are broken down by strong ultraviolet radiation, release chlorine atoms, and then react with ozone molecules.

Why do CFCs deplete the ozone layer but HFCS do not?

While HCFCs contain chlorine atoms, they are less damaging to the ozone layer because they also contain hydrogen atoms, which causes them to break down in the atmosphere faster.

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How does ozone layer get depleted?

Chlorofluorocarbons or CFCs are the main cause of ozone layer depletion. These are released by solvents, spray aerosols, refrigerators, air-conditioners, etc. The molecules of chlorofluorocarbons in the stratosphere are broken down by the ultraviolet radiations and release chlorine atoms.

How do CFCs affect ozone production quizlet?

How do CFCs affect ozone production? They cause ozone depletion. The depletion of ozone over Antartica is greatest during which months?

How do Chlorofluorocarbons CFCs contribute to ozone depletion Brainly?

When ultraviolet light waves (UV) strike CFC* (CFCl3) molecules in the upper atmosphere, a carbon-chlorine bond breaks, producing a chlorine (Cl) atom. The chlorine atom then reacts with an ozone (O3) molecule breaking it apart and so destroying the ozone.

Why CFCs are considered as pollutants?

The chlorofluorocarbons release chlorine atoms when they break down in the presence of UV radiations and thus deplete the ozone layer. The chlorine released reacts with ozone molecules and forms oxygen which reduces the ozone quantity causing its depletion. This is the reason why CFCs are considered as pollutants.

What are CFCs and why were they produced?

CFCs were developed as ideal gases used as refrigerants for refrigerators. Because of their special characteristics, inflammability and non-toxicity to human beings, CFCs were massively produced and consumed, particularly in developed countries, after the 1960’s.

What is the relationship between CFC and ozone?

Relationship between CFC’s and Ozone: When CFC’s are released into the stratosphere, they end up being broken up by the UV light, resulting in chlorine being released. This acts like a catalyst with the ozone molecules creating chlorine monoxide and molecular oxygen.

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What is the CFCs ozone?

Chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs) and halons destroy the earth’s protective ozone layer, which shields the earth from harmful ultraviolet (UV-B) rays generated from the sun. CFCs and HCFCs also warm the lower atmosphere of the earth, changing global climate.

What are 3 causes of depletion to the ozone layer?

The main cause of ozone depletion and the ozone hole is manufactured chemicals, especially manufactured halocarbon refrigerants, solvents, propellants, and foam- blowing agents (chlorofluorocarbons (CFCs), HCFCs, halons).

What gases deplete the ozone layer?

Ozone depleting substances are chemicals that destroy the earth’s protective ozone layer. They include:

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

What is ozone layer depletion and its effects?

Ozone layer depletion causes increased UV radiation levels at the Earth’s surface, which is damaging to human health. Negative effects include increases in certain types of skin cancers, eye cataracts and immune deficiency disorders. UV rays also affect plant growth, reducing agricultural productivity.

Why is ozone layer getting depleted at the higher levels of the atmosphere?

Ozone layer is getting depleted at the higher levels of the atmosphere due to effect of chlorofluorocarbons CFCs which are used as refrigerants and in fire extinguishers.

Where do CFCs come from?

The most common source of CFCs are refrigerants, but fire suppression systems for aircraft and aerosols also emit CFCs into the atmosphere.

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