Nancy J. Schmitt
The Third lesson reviews data on tables and graphs. A few of the chemicals in our water system currently being tested are shown on the tables and graphs. The numbers are represented in grams and liters. An interesting exercise could be made in translating the thresholds to ounces per quart. The maximum threshold,if sustained for more than one hour will potentially harm the wildlife in the water.
For Algebra I students, a review of scientific notation would be appropriate at this time in addition to ordering the chemicals by highest to lowest threshold levels.
Questions based on graph and table:
5.
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What chemical has the highest allowed maximum level?
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6.
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What chemical has the lowest allowed maximum level?
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7.
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Looking at the graph, what chemicals are above their maximum level?
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8.
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Looking at the graph, what chemicals are below their maximum level?
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9.
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If the Mercury level is doubled, how much is it over the allowed maximum?
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A more complete table is available on the EPA government website. Students may be interested in other chemicals and what their thresholds are.