What evidence did Susan Solomon discover that led NASA ozone-modeler Paul Newman to reject his hypothesis in favor of her polar cloud hypothesis?
The level of ClO in the stratosphere supported the hypothesis that UV-B breaks down CFCs, which in turn break down ozone molecules.
What is the evidence for ozone depletion?
In the 1970s, scientists noticed that the ozone layer was thinning. Researchers found evidence that linked the depletion of the ozone layer to
the presence of chlorofluorocarbons (CFCs) and other halogen-source gases in the stratosphere
.
What evidence did Susan Solomon discover that NASA ozone modeler Paul Newman to reject his hypothesis in favor of her polar hypothesis?
What evidence did Susan Solomon discover that led NASA ozone-modeler Paul Newman to reject his hypothesis in favor of her polar cloud hypothesis?
The level of ClO in the stratosphere supported the hypothesis that UV-B breaks down CFCs, which in turn break down ozone molecules.
How did they test the hypothesis about CFCs destroying ozone?
CFCs break down to produce chlorine
. Scientists can recreate the intense solar radiation found in the upper atmosphere in their labs. Shining this lab-made solar radiation on CFCs and then looking for chlorine would provide evidence either for or against this idea. Chlorine atoms destroy ozone.
Who discovered the connection between CFCs and the ozone layer?
Sherwood Rowland and Mario J. Molina
discovered that chlorofluorocarbons (CFCs) could deplete Earth’s atmospheric ozone layer, which blocks the sun’s damaging ultraviolet rays. When the scientists reported their findings in 1974, CFCs were widely used as refrigerant gases and as propellants in aerosol sprays.
What two conditions must be met for ozone to become depleted in the stratosphere group of answer choices?
Ozone Depletion.
When chlorine and bromine atoms come into contact with ozone in the stratosphere
, they destroy ozone molecules.
Which of the following best describes the effect of temperature on the chemical reactions that result in ozone layer depletion quizlet?
Which of the following best describes the effect of temperature on the chemical reactions that result in ozone layer depletion?
Low temperatures create polar stratospheric clouds that lead to the production of free radicals of chlorine
, which result in the breakdown of ozone at the beginning of the antarctic spring.
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 happens if there was no ozone layer?
The Ozone Layer
Life couldn’t exist without this
protective ozone
, which is also called the “ozone layer.” The sun gives off light, heat, and other types of radiation. Too much UV (ultraviolet) radiation can cause skin cancer, cataracts, and harm plants and animals.
What can we do to prevent ozone depletion?
- 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.
Why are CFCs bad?
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.
Do we still have a hole in the ozone layer?
The record-breaking 2020 Antarctic ozone
hole finally closed at the end of December
after an exceptional season due to naturally occurring meteorological conditions and the continued presence of ozone depleting substances in the atmosphere.
Are CFCs still used?
Production of
CFCs ceased in 1995
. HCFC production will cease in 2020 (HCFC-22) or 2030 (HCFC-123). This means that although equipment that uses these refrigerants may operate just fine for 20 or 30 years, new or recycled refrigerant to service it may not be available. Don’t buy equipment that uses CFC refrigerants.
Are CFCs toxic to breathe?
Inhaling CFCs
Inhalation of CFCs can also disturb the heart rhythm, which can lead to death. Exposure to large amount of CFCs could
potentially cause asphyxiation
, according to the Centers for Disease Control and Prevention.
What does CFCs stand for?
Chlorofluorocarbons
(CFCs) are nontoxic, nonflammable chemicals containing atoms of carbon, chlorine, and fluorine. They are used in the manufacture of aerosol sprays, blowing agents for foams and packing materials, as solvents, and as refrigerants.
When were CFCs banned?
Once widely used in the manufacture of aerosol sprays, as blowing agents for foams and packing materials, as solvents, and in refrigeration, its production was banned in
2010
, although CFC-11 continues to leak from foam building insulation and appliances manufactured before that year.
