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There's Chemistry in our Rivers!

Created by MikeMaster99

Fun Trivia : Quizzes : Earth Science
Theres Chemistry in our Rivers game quiz
"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  

1. Which dissolved gas is essential to most life in our rivers?
    Methane (CH4)
    Nitrogen (N2)
    Carbon dioxide (CO2)
    Oxygen (O2)

2. Which of the following gases are commonly found in river water?
    All three of these
    Argon (Ar)
    Carbon dioxide (CO2)
    Nitrous oxide (N2O)

3. Dissolved oxygen can exceed the theoretical saturation concentration.

4. In a well-oxygenated water column, manganese (Mn) and iron (Fe) are most commonly found in which oxidation states?
    III and IV
    II and II
    IV and III
    III and III

5. 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 S
    N and P
    P and Cl
    S and Cl

6. 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

7. In some stagnant backwaters, a rotten-egg smell can sometimes be detected. What is the name of this gas?
    Hydrogen sulfate (H2SO4)
    Nitrogen sulfide (N2S)
    Methane (CH4)
    Hydrogen sulfide (H2S)

8. Buffering capacity is an important factor describing the behavior of aquatic ecosystems. What is the best definition of a 'buffer'?
    A substance that makes the solution more alkaline
    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 polishes pollutants from the water

9. 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?

10. 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 Jul 12 12