Driscoll et al.(365) write that: "Without strong acid anions, cation leaching in forest soils of the Northeast is driven largely by naturally occurring organic acids derived from the decomposition of organic matter, which takes place primarily in
the forest floor. ... [O]rganic acids tend to mobilize Al through formation of organic–Al complexes, most of which are deposited lower in the soil profile ... This process ... results in surface waters with low concentrations of Al. ... Acidic deposition to forest soils with base saturation values less than 20% increases Al mobilization and shifts chemical speciation of Al from organic to inorganic forms that are toxic to terrestrial and aquatic biota." Exactly what are they saying? Explain.
Aluminum is very important in the acidification process. Natural cycles tend to
remove aluminum from the water on the ground and transport the aluminum to clayey parts
of the soil. Little aluminum is present in surface waters. Acid rain reverses this natural cycle
and sends the resulting inorganic aluminum compounds into the biosphere, with devastating
results for wildlife and fish.
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The relative permittivity is also called the _________constant.
Fill in the blank(s) with the appropriate word(s).
Wire B has twice the length and twice the radius of wire A. Both wires are made from the same material. If wire A has a resistance R, what is the resistance of wire B?
1. 4R 2. 2R 3. R 4. ½ R 5. ¼ R
A parallel plate capacitor is constructed with plate area of 0.40 m2 and a plate separation of 0.10 mm. How much charge is stored on it when it is charged to a potential difference of 12 V?
What will be an ideal response?
Which of these is a scientific hypothesis (that could be proved wrong)?
A) atoms in proper proportions make us feel good B) atoms are in all the stars in the universe C) an atom is the smallest bit of matter in a material D) none of the above