1. Check & Reflect
Page 224, #s 1-5, & 8

2. Governments set water quality guidelines for 5 categories of use.
What are they?
Human Drinking Water
Recreation uses, such as swimming
Livestock Drinking Water
Irrigation
Protection of Aquatic Life (monitoring lakes, rivers, etc.)

3. List 4 different groups of invertebrates that can be found in freshwater systems.
Four groups of organisms that can be found in freshwater systems are: insects, crustaceans, worms and mollusks.

4. Identify 5 chemicals that are regularly monitored in aquatic systems.
Dissolved oxygen (DO), acids, heavy metals, plant nutrients (phosphorous and nitrogen), and pesticides.

5. What effect does spring acid shock have on aquatic organisms?
Spring acid shock reduces the numbers and diversity of aquatic organisms because it harms their eggs as well as young offspring.

6. Mayflies and stoneflies do not tolerate acidic conditions.
Identify an invertebrate family that would probably be among the first to die if the pH of its habitat decreased.
Mayflies and stoneflies do not tolerate acidic conditions.
Other insects could have been mentions such as caddisflies.

7. Copy the table below into your notebook.
Calculate the concentration of each solution in parts per million and fill in the last column.
Solute (mL): 2.0
Volume of final solution (mL): 1000
2000 ppm

8. Volume of final solution (mL): 100 9 ppm
Solute (mL):
Volume of final solution (mL): 100
9 ppm 8

9. Volume of final solution (mL) 62 ppm
Solute (mL): 0.62
Volume of final solution (mL)
62 ppm 9

10. Explain what happens when a high concentration of phosphorus enters a water system.
Excess phosphorus supports growth of algae and other plants. When these plants die, they are food for bacteria. The bacteria thrive because there is food available, and they use up the oxygen in the water for cellular respiration. When the dissolved oxygen count in the water goes down, fish, amphibians, and many insects cannot survive. 10

11. Monitor more locations to determine the source of the mercury.
Suppose that high levels of mercury were found in your community. List at least 3 recommendations that you would make to the government to deal with the issue.
Monitor more locations to determine the source of the mercury.
Remove the contamination and alert and educate the people affected by the contamination.
Impose stricture guidelines on manufacturing/dumping. 11