Photo AI
The graph shows the concentration of CCl3F known as CFC-11, as measured at the Cape Grim Baseline Air Pollution Station, in north-western Tasmania - HSC - SSCE Chemistry - Question 21 - 2008 - Paper 1
Question 21
The graph shows the concentration of CCl3F known as CFC-11, as measured at the Cape Grim Baseline Air Pollution Station, in north-western Tasmania. (a) Explain the ... show full transcript
Worked Solution & Example Answer:The graph shows the concentration of CCl3F known as CFC-11, as measured at the Cape Grim Baseline Air Pollution Station, in north-western Tasmania - HSC - SSCE Chemistry - Question 21 - 2008 - Paper 1
Step 1
Explain the changes in concentration of CFC-11 as illustrated by the graph.
Answer
The graph illustrates two distinct trends in the concentration of CFC-11 over time. Initially, there appears to be an increase in concentration, likely due to rising production and usage of CFCs in various industries such as refrigeration and aerosol propellants. This rising phase could be attributed to the lack of awareness about the environmental impacts of CFCs, especially concerning ozone depletion.
Subsequently, there might be a noticeable decrease in concentration, which corresponds with global efforts to phase out CFCs, particularly after the Montreal Protocol was established in 1987. This shift indicates successful regulatory measures and a reduction in the use of substances harmful to the ozone layer, showcasing the effectiveness of international collaboration on environmental issues.
Step 2
Why is it important to monitor the concentration of CFC-11?
Answer
Monitoring the concentration of CFC-11 is crucial for several reasons. Firstly, CFCs are significant contributors to ozone layer depletion, which protects the Earth from harmful ultraviolet radiation. Increased UV exposure can lead to serious health issues, including skin cancer and cataracts, as well as detrimental effects on ecosystems.
Secondly, tracking CFC levels helps scientists understand the impact of regulatory actions like the Montreal Protocol. By measuring these concentrations, researchers can assess whether the initiatives are effectively reducing atmospheric CFC levels and aiding in ozone recovery. Furthermore, continuous monitoring can prevent any potential resurgence of CFC usage, thus reinforcing global commitments to environmental protection.