Reaction 1a: MnCl2 + 2NaOH → Mn (OH)2 + 2NaCl
Reaction 1b: O2 + 2Mn (OH)2 → 2MnO(OH)2
Reaction 2: MnO (OH)2 +H2SO4 + 2NaI → Mn(OH)2 + NaSO4 + H2O + I2
Reaction 3: I2 + 2Na2S2O3 à Na2S4O6 + 2NaI
QUESTION 1:
For the dissolved oxygen reactions:
What type of reaction is 1a? Reaction 1a is a Double Displacement Reaction, because one molecule from each of the reactants is switched.
What type of reaction is 1b? Reaction 1b is a Synthesis Reaction, because the reactants are joined together.
What do you think reaction 2 and 3 are? I would guess that 2 would be a Triple Displacement Reaction, and 3 would be a Single Replacement Reaction (sort of).
QUESTION 2:
a. What is hypoxia? Hypoxia is the lack of oxygen. This can occur to the whole organism in an oxygen-deprived environment, or to just one part of the body if there is inadequate blood circulation.
b. When does hypoxia reach its highest levels in Long Island Sound and in the Gulf of Mexico? In coastal areas, hypoxia reaches its highest levels with a combination of dead algae and pollution.
c. What are the causes of hypoxia? Hypoxia is caused by phosphorous and nitrogen, and we can help solve this problem by better sewage treatment, reducing the amount of pesticides and fertilizers going into the ocean, and putting more plants in the water.
d. Research the sources of high levels of nitrate ion in water bodies. Sources of nitrogen and nitrates may include runoff or seepage from fertilized agricultural lands, animal feedlots, or municipal and industrial waste water. Other sources may include runoff from garbage dumps, septic tanks and private sewage disposal systems, and urban drainage.
e. What are “safe levels “ of nitrate in drinking water and what are the effects on humans of drinking water with high levels of nitrate ion? Most states enforce a drinking water standard for nitrate of 10 milligrams per liter (10 mg/L); if there too much more than this amount, humans can actually also experience hypoxia.
Research:
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