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The table shows data for ozone concentrations over 50 years in the upper atmosphere above Antarctica - HSC - SSCE Chemistry - Question 22 - 2015 - Paper 1
Question 22
The table shows data for ozone concentrations over 50 years in the upper atmosphere above Antarctica. | Year | Ozone Concentration (Dobson Units) | |------|--------... show full transcript
Worked Solution & Example Answer:The table shows data for ozone concentrations over 50 years in the upper atmosphere above Antarctica - HSC - SSCE Chemistry - Question 22 - 2015 - Paper 1
Step 1
Draw a line graph of the data on the grid provided.
Answer
To create a line graph of the ozone concentration data over the specified years, follow these steps:
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Label the Axes: The x-axis should represent 'Time (Years)', ranging from 1955 to 2005, while the y-axis should indicate 'Ozone Concentration (Dobson Units)', with a scale appropriate to the data, for example from 120 to 360.
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Plot the Points: Using the data from the table, plot the following points on the grid:
- (1955, 320)
- (1960, 300)
- (1970, 300)
- (1980, 260)
- (1995, 130)
- (2000, 130)
- (2005, 150)
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Draw a Smooth Line: Connect the plotted points with a smooth line to illustrate the trend of ozone concentration over the years. Make sure the line follows the general trend of the data, with dips and rises accurately represented.
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Check for Clarity: Ensure the graph is clear, with appropriate scales and labels, making it easy to understand the changes in ozone concentration over the years.
Step 2
Describe a method by which this data could have been measured.
Answer
The information could have been measured using a ground-based UV spectrophotometer. This instrument assesses UV light intensity at specific wavelengths that ozone absorbs. By comparing the intensity of light at these wavelengths to nearby wavelengths that ozone does not absorb, the amount of absorption can be quantified. This data allows for accurate measurements of ozone concentrations. Additionally, periods of measurement can be varied to monitor fluctuations in ozone levels over time, enhancing the reliability of the data gathered.