#1-9 (pg. 102)- Horologic Cycle
- Evaporation and Condensation: removes nearly all dissolved substances, Bacterial Action: converts dissolved organic contaminants into a few simple compounds, Filtration: removes all suspended matter
- The properties of aluminum hydroxide are related to the process of flocculation because aluminum hydroxide is used in flocculation.
- Calcium oxide is sometimes added to the final steps in water to neutralize it.
- Fluoride is added, about 1ppm, to promote dental health and to reduce tooth decay.
- The advantages of chlorinated drinking water are that it kills disease producing microorganisms.
- The disadvantages are that it can react with organic compounds being dangerous for human health.
- This is because stream water may be filtered but it has not removed bacteria that could make you sick.
- Two alternated that could be used rather than chlorination are charcoal filtration and Ozone and ultraviolet light usage.
18. If water evaporation suddenly stopped the whole horologic cycle would stop because you need evaporation to have condensation and precipitation.
19. If water was constantly a liquid, condensation wouldn't be able to happen because the water would be too heavy.
20. This is to regulate it because it can be harmful in large doses.
21. When the water moves through sand and gravel in streams that is simulated in the sand filtration process. The charcoal filtration is like the chlorination process or bacterial action.
22. a. 1ppm b. 7.ppm c. 365 ppm
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