FREE ODP Regulations and Safe Handling Practices Questions and Answers
What types of compounds can damage the Earth's ozone layer?
Explanation:
Chlorofluorocarbons (CFCs) can damage the Earth's ozone layer. These compounds contain chlorine and fluorine atoms, which are released into the atmosphere when CFCs are emitted. Once in the atmosphere, CFCs can reach the stratosphere, where they are broken down by ultraviolet (UV) radiation. This process releases chlorine atoms, which then react with ozone molecules, leading to the destruction of the ozone layer. Carbon dioxides and pesticides do not have the same harmful effect on the ozone layer as CFCs.
UV radiation can cause which of the following more significantly:
Explanation:
UV radiation can cause various harmful effects such as skin cancer, cataracts, and damage to ecosystems.
The ozone layer absorbs the sun's which of following radiation and prevents it from falling on the earth's surface:
Explanation:
The ozone layer absorbs the majority of the Sun's harmful ultraviolet (UV) radiation and prevents most of it from reaching the Earth's surface. The UV radiation from the Sun causes the splitting of oxygen molecules, and the resulting oxygen atoms react with other oxygen molecules to form ozone. This process is known as the ozone-oxygen cycle.
The average ozone concentration in Earth's atmosphere as a whole is only about ______ parts per million:
Explanation:
For every million air molecules in the atmosphere, approximately 0.3 of them are ozone molecules. Ozone concentration can vary depending on the altitude and location within the atmosphere. The highest concentrations of ozone are typically found in the ozone layer within the stratosphere
Which one of the following is the largest ozone depletion substation that is emitted through the activities of humans:
Explanation:
Nitrous oxide is a potent greenhouse gas that is emitted from various human activities, including agricultural practices, industrial processes, and the combustion of fossil fuels. While it is primarily known for its contribution to global warming, it also has a significant impact on the ozone layer. Nitrous oxide is broken down by high-energy UV radiation in the stratosphere, releasing nitrogen atoms. These nitrogen atoms can then react with ozone, leading to its depletion.
The ozone layer is mainly found at _______ above the surface of the earth.
Explanation:
The ozone layer is a region within the stratosphere at 6 to 30 miles above Earth's atmosphere
Halons used in fire extinguishers contain ______ atoms:
Explanation:
Halons used in fire extinguishers contain bromine atoms. The presence of bromine atoms in halons gives them their fire suppression capabilities. Bromine is highly reactive and can disrupt the chain reactions that occur during combustion, effectively suppressing the fire.
The Montreal Protocol treaty has been amended to ban CFC production after year_______ in the developed countries:
Explanation:
The Montreal Protocol treaty has been amended to ban CFC (chlorofluorocarbon) production after January 1, 1996, in developed countries.
The complete phase-out deadline of R-22 is by ______ in developed countries:
Explanation:
The most common deadline for the complete phase-out of R-22 in developed countries is January 1, 2020.
Scientists predict that the ozone layer will return to pre-1980 levels by ______ :
Explanation:
Scientists predict that the ozone layer will return to pre-1980 levels by 2060 to 2075 due to the implementation of international agreements like the Montreal Protocol, which aimed to phase out ozone-depleting substances. These substances, such as chlorofluorocarbons (CFCs), were responsible for the ozone layer depletion. As countries adhere to the regulations set by these agreements, the levels of ozone-depleting substances in the atmosphere decrease, allowing the ozone layer to recover gradually over time.
CFCs have atmospheric lifetimes ranging from over ______.
Explanation:
CFCs have long atmospheric lifetimes due to their stability and low reactivity in the lower atmosphere (troposphere) ranging from decades to centuries. They are relatively inert and do not readily undergo chemical reactions that break them down. Once it reaches Stratosphere, it can be broken down by high-energy UV radiation from the Sun releasing chlorine atoms resulting in the depletion of the Ozone layer.