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ENVIRO CHAPTER TWO (MC)
Terms in this set (16)
Why was it important to do a control for each well in the daphnia lab?
Each daphnia is different due to their varying heart rates.
Why might the results in the daphnia lab have been highly variable?
Daphnia have been in different environments such as being exposed to light and heat more which affects heart rate.
Why do the following two factors affect the conductivity of a solution? 1. Concentration of solute and 2. Degree of dissociation of solute.
The higher the concentration and degree of dissociation mean there will be more ions that are responsible for conducting electricity in water, meaning higher conductivity.
Bicarbonate is the most abundant ion in fresh water. Show how carbon dioxide and water react to ultimately produce bicarbonate.
CO2 + H2O -> H2CO3 -> H (+) + HCO3 (-)
Explain what epilimnion, metalimnion, and hypolimnion layers are, what causes them, and list at least one substantive fact about each one.
These layers are caused because water's density changes with temperature.
Epilimnion is the top layer where photosynthesis takes places so there's a lot of oxygen/
Metalimnion is the second layer
Hypolimnion is the bottom layer where decomposition depletes dissolved oxygen.
How is the solubility of oxygen in water affected by an increase in water temperature?
Oxygen is less soluble in warmer water.
Pollutants can be discharged both directly and indirectly into water sources. What two terms are used for this?
Point and nonpoint sources
Lead in drinking water is a public health issue. How does lead enter the municipal water system?
Leached from older pipes made out of lead
What is the major source of phosphates in water and what can happen if there are too many phosphates in water?
A major source of phosphates in water is agricultural run off and since phosphate is a plant nutrient it leads to algal blooms and eutrophication.
What are oxygen-consuming wastes? Give two examples.
Organic matter such as feces, waste from slaughter houses and industrial wastes from food processing plants
What water-related act was passed in 1974? What does this act require communities to do?
The Safe Water drinking act which requires communities to regularly monitor their drinking water for toxins
What is the difference between a primary standard and secondary standard when it comes to the Safe Drinking Water Act?
Primary standards are based on health criteria; Secondary standards relate to odor, color and taste
What does MCL mean?
Maximum contaminant level - the highest concentration that the EPA allows
Why does lead have the symbol, Pb?
It comes from the latin word for lead which is plumbum
Why is lead more dangerous in young children than it is in adults?
They can not get it out of their system as easily as adults
Elemental mercury and its inorganic compounds are not readily absorbed by aquatic life, so how does the mercury end up in fish? What is the chemical formula for this form of mercury?
Anaerobic bacteria convert inorganic mercury to methylmercury CH3Hg (+)
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