CFC Chlorofluorocarbon Properties & Environmental Impact

Question 1

What property makes chlorofluorocarbons (CFCs) harmful to the ozone layer?

Accepted Answer

Their release of chlorine atoms

Answer

Chlorofluorocarbons (CFCs) are harmful to the ozone layer because when they reach the stratosphere, intense ultraviolet (UV) radiation breaks them down. This process releases highly reactive chlorine atoms. These chlorine atoms then act as catalysts, repeatedly destroying ozone molecules, which depletes the protective ozone layer and allows more harmful UV radiation to reach Earth.

Question 2

Which layer of the atmosphere is most affected by CFCs?

Accepted Answer

Stratosphere

Answer

The stratosphere is the atmospheric layer most affected by CFCs because it is where the Earth's protective ozone layer is located. CFCs, being very stable, slowly drift upwards to the stratosphere. Once there, they are broken down by strong ultraviolet radiation, releasing chlorine atoms that catalytically destroy ozone molecules in this vital layer.

Question 3

What is the primary environmental impact of CFC emissions?

Accepted Answer

Ozone layer depletion

Answer

The primary environmental impact of CFC emissions is the depletion of the Earth's ozone layer. When CFCs reach the stratosphere, they release chlorine atoms that break down ozone molecules, thinning this protective shield. This depletion allows more harmful ultraviolet (UV) radiation to reach the Earth's surface, posing risks to human health and ecosystems.

Question 4

Which international treaty addresses the phase-out of CFCs?

Accepted Answer

Montreal Protocol

Answer

The Montreal Protocol is the landmark international treaty specifically designed to protect the ozone layer by phasing out the production and consumption of ozone-depleting substances, including CFCs. Signed in 1987, it has been highly successful in reducing the global use of these harmful chemicals. Other treaties address different environmental concerns.

Question 5

Why were CFCs widely used before their environmental impact was known?

Accepted Answer

They were inexpensive and efficient

Answer

CFCs were widely used before their environmental impact was known because they possessed highly desirable properties: they were non-toxic, non-flammable, stable, and very efficient as refrigerants, propellants, and solvents. Their low cost and effectiveness made them a popular choice across various industries, leading to their widespread adoption for decades.

(CFC) Chlorofluorocarbon Certification Practice Test

(CFC) Chlorofluorocarbon Certification Practice Test

CFC Chlorofluorocarbon Properties & Environmental Impact