C INVESTIGATING THE CAUSE OF THE FISH KILL
What are the investigators looking for regards to the fish kill?
C.1 SOLUBILITY
Solubility of Solids
1. Define solubility
2. Define saturated
3. List the two factors that do not affect how much of a substance can
dissolve?
4. If you have a horizontal line of solubility what does that show for the
substance graphed?
5. A solubility line with a steep incline tells you what about the relationship
of the solute to water?
6. Each point plotted on the solubility line tell you what about that
substance?
7. What do points below the line show?
8. Where on a solubility graph would you find a supersaturated solution?
9. What will happen to the solubility of a solid in water when the
temperature of the water is lowered?
Solubility of Gases
10. As the temperature of water decreases what happens to the solubility
of water?
11. Compare gases with ionic solids. ( see figure 22)
12. List the two factors that a gas s solubility is dependent on?
13. What would happen to the solubility of a gas if they double the
pressure of the gas? This is called what?
C.3 OXYGEN SUPPLY AND DEMAND
1. What do aquatic organisms need to survive?
2. What interferes with the oxygen supply to aquatic
organisms?
3. Explain water's bond.
4. Describe how oxygen dissolves in water.
5. Is dissolved oxygen available to humans?
6. Describe photosynthesis.
7. List the photosynthesis equation.
8. What is the name of the oxygen - consuming bacteria that
aquatic organisms compete with?
9. What do these organisms feed on?
10. When are aquatic creatures at risk?
11. Define DO.
12. The amount of dissolved oxygen that fish needs is?
13. Rank the fish in ascending order that will migrate when
dissolved oxygen supplies reduce.
C.4 TEMPERATURE AND GAS SOLUBILITY
1. What effect does temperature have on dissolved
oxygen?
2. The amount of dissolved oxygen determines what?
3. If the temperature of the water increased 10 o what
happens to chemical reactions of the fish?
4. Explain the purpose of refrigeration.
5. When water temperatures increase what happens to
the temperature of the fish?
6. The temperature of the water is raised, the fish's
chemical reactions are what?
7. The fish now require what, since the temperature of
the water is increased?
8. Consider aerobic bacteria, what effect does raising
the temperature of water have on aerobic bacteria?
9. Explain what causes a fish kill after a warm spell.
10. What type of pollution would explain a raise in
water temperature in Snake River?
C.7 IONS AND IONIC COMPOUNDS
1. Define an ion.
2. Cautions are?
3. Anions are?
4. An ion can be this, or it can be this.
5. An ionic compound has how many parts?
6. List the parts of an ionic compound and where they
come from.
7. What is the ending ( suffix) associated with the
negative ion?
8. List the rule for writing the correct formula of an ionic
compound.
9. Describe what must be done when two ion charges do
not add up to zero?
10. What role does a subscript have in writing a balanced
equation of an ionic compound?
10. Define polyatomic.
11. How are parentheses used to write ionic compounds?
C.8 DISSOLVING IONIC COMPOUNDS
1. To dissolve in water what must a solid
do?
2. Water molecules are attracted to what?
3. As anC.9 HEAVY METALS ION CONTAMINATION
1. List four metallic elements essential to life.
2. What is a heavy metal?
3. List the heavy metals that are of greatest concern if they are found in
water.
4. Where in the body do heavy metal ions attach to?
5. List the types of damage that heavy metals do to the body.
6. How do heavy metals enter the eco system?
7. In Latin what does lead mean?
8. List sources of lead in the environment.
9. When where lead pipes replaced in the U.S.?
10. In gasoline what was removed?
11. This compound was used to produced what?
12. Urban childerns primary source of lead exposure is?
13. The EPA recommends this amount of lead in drinking water.
14. How is lead removed from the human system?
15. In Latin mercury means what?
16. List the common uses of mercury.
17. Describe mercury at room temperature.
18. Looking at the big periodic table find mercury. What are other elements
appear listed in the same manner?
19. Compare these elements to mercury.
20. What does the expression "mad as a hatter" mean?
21. Define an organic compound.
22. What role does anaerobic bacteria play in mercury poisoning?
23. The concentration of mercury ions in U.S. water supply is?
24. Describe how mercury poising can happen.
25. List the uses of Cadmium.
26. What are the causes of cadmium poisoning?
27. The EPA s recommended limits of cadmium is?
28. Describe how cadmium ions enter the ecosystem.
29. What problems do cadmium ions cause in humans?
ionic crystal dissolves in water
this happens?
4. When is an ionic compound only slightly
soluble in water?
C.11 MOLECULAR SUBSTANCES IN THE RIVER
1. Describe the bond between a metallic and a
nonmetallic substance.
2. Ionic substances are?
3. List the molecules that have little attraction
among their molecules.
4. List the molecules that have a larger attraction
between their molecules.
5. What determines the how soluble a substance
will be in water?
6. What causes attraction between molecules?
7. Water is?
8. What does a nonpolar substance have?
9. What do polar molecules tend to do in water?
10. What substances dissolve in water?
11. Nonpolar substances are good solvents for?
12. What is the rule of dissolving?
13. What determines if molecular contaminants
killed the fish?