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There's Chemistry in our Rivers!
"This quiz looks at the fascinating and diverse chemistry happening in our rivers. Just because the water may be clear, doesn't mean nothing is happening!"
15 Points Per Correct Answer - No time limit
Which dissolved gas is essential to most life in our rivers?
Carbon dioxide (CO2)
Which of the following gases are commonly found in river water?
All three of these
Carbon dioxide (CO2)
Nitrous oxide (N2O)
Dissolved oxygen can exceed the theoretical saturation concentration.
In a well-oxygenated water column, manganese (Mn) and iron (Fe) are most commonly found in which oxidation states?
IV and III
III and III
II and II
III and IV
Which two non-metals are most commonly found to limit plant growth when all other conditions are conducive for growth (either of these might be the limiting nutrient or they might co-limit)?
N and P
P and Cl
N and S
S and Cl
Choose the most 'bioavailable' form of nitrogen from the following options. Bioavailability refers to the ease of use of that chemical species by organisms for cellular requirements (including growth).
dissolved nitrogen gas
ammonia or ammonium
In some stagnant backwaters, a rotten-egg smell can sometimes be detected. What is the name of this gas?
Hydrogen sulfide (H2S)
Hydrogen sulfate (H2SO4)
Nitrogen sulfide (N2S)
Buffering capacity is an important factor describing the behavior of aquatic ecosystems. What is the best definition of a 'buffer'?
A substance that minimizes change in pH when an acid or base is added
A substance that makes the pH closer to neutral
A substance that makes the solution more alkaline
A substance that polishes pollutants from the water
Bacteria mediate many of the chemical reactions occurring in the water column and in the sediments of rivers. They usually increase the rate of these reactions. Considering the strict definition of a catalyst, are these bacteria acting as catalysts?
What is the DIRECT effect of increasing CO2 in the atmosphere on the pH of river water? You can ignore indirect effects such as changes in vegetation or temperature, or altered rates of primary production.
It will make the water more basic (increase pH)
It will make the water more acidic (lower pH),
It will not affect the river water pH
There is insufficient information to answer this question.
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Compiled May 25 13