OZONE layer protection; CFC Exam 2023 Questions and Answers
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Course
CFC
Institution
CFC
ozone construction exists as 3 basic forms - Answer- o - oxygen atom
o2 - oxygen molecule
o3 - ozone molecule - toxic, unstable gas, protects us from UV sunlight
sunlight strikes o2 molecules and splits them, the floating o atoms will "float" and come into contact with o2 to form - Answer- o3-...
OZONE layer protection; CFC Exam 2023
Questions and Answers
ozone construction exists as 3 basic forms - Answer- o - oxygen atom
o2 - oxygen molecule
o3 - ozone molecule - toxic, unstable gas, protects us from UV sunlight
sunlight strikes o2 molecules and splits them, the floating o atoms will "float" and come into contact with o2 to form - Answer- o3- ozone molecule
the stratosphere is approx. how far away above earths surface - Answer- 15 to 50 km
normally there is a balance between the ___________ and ___________ of o3 - Answer- destruction and construction
o3 is stratosphere is essential to life and referred to as.. - Answer- good ozone
o3 in the stratosphere is destroyed when it combines with.... - Answer- chlorine and/or bromine atoms
one chlorine atom can destroy or prevent creating how many o3 molecules during it lifetime - Answer- tens of thousands
the process of chlorine destroying the o3 molecules is accelerated as a result of what - Answer- increased UV and cold temperatures
halocarbons in the stratosphere leads to.. - Answer- ozone depletion
ozone delpletion potential (ODP) value determines what - Answer- damage that may occur due to the compound reaction and life expectancy
ODP values are compared to what - Answer- R-12 (also, R-11, R114)
CFC-R12 HCFC-22
HFC-134a - Answer- ODP = 1.0
ODP = 0.55
ODP = 0.0
What is the main purpose of the ozone layer - Answer- to filter/absorb UV radiation from
the sun, prevent/reducing the harmful UV rays from reaching the earths surface
3 types of UV rays: - Answer- UV-c - 100% filtered by stratosphere ozone UV-b - 95% filtered UV-a - 5% filtered
UV-c dangers - Answer- poses maximum risk
UV-b dangers - Answer- redding/darkening of skin
sunburns
skin cancer
UV-a dangers - Answer- less intense than UV-b
penetrates deep into skin layers
penetrates deeper into eye affects connective tissue and blood vessels
ozone destruction refers to.. - Answer- the breakdown of ozone into oxygen atoms and oxygen molecules at a rate that is greater than ozone (o3) can be created
Ozone depletion refers to.. - Answer- the reduction of ozone concentration in the atmostphere
Ozone concentration normally varies between.. - Answer- 0.6 ppm and 15 ppm (depending on altitude)
ozone depletion is not.. - Answer- the total destruction or removal of the ozone, it is the "thinning" of the concentration
ozone depletion concerns; health issues - Answer- cancer
cataracts
immune system supression
ozone depletion concerns; environment issues - Answer- crop yield reduction
marine ecosystem damage
premature aging of products
increased global warming
how far above the earths surface is the troposphere located - Answer- 15 km above the earths surface
ozone in the troposphere is also referred to as.. - Answer- ground-level ozone and is the
main ingredient of smog (lower-level ozone and sunlight)
O3 is in the troposphere is created by chemical reactions of.. - Answer- Nitrogen oxide (NOx) and Volatile organic compounds (VOCs) in the presence of sunlight
VOC + NOx + Sunlight = O3 (in the troposphere)
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