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1)	pH is defined as
	A) the negative logarithm (base 10) of the hydrogen ions concentration. B) a measure of how acidic or basic the water is. C) both A and B.
2)	Ammonia is most toxic at
	A) high pH B) low pH C) ammonia toxicity does not depend on the pH
3)	The pH in an aquarium with lots of plants will
	A) rise during the day and fall at night B) fall during the day and rise at night C) pH should be stable at all times
4)	The solubility of oxygen (and other gasses) is highest at
	A) high temperature B) low temperature C) temperature does not affect gas solubility
5)	In an aquarium, alkalinity refers to
	A) the concentration of carbonates and bicarbonates in the water. B) the ability of the water to resist changes in pH (buffering capacity). C) how basic the water is. D) both A and B
6)	Nitrification is the bacteria-driven process that turns
	A) ammonia to nitrite to nitrate to nitrogen gas. B) ammonia to nitrite to nitrate. C) nitrate to nitrogen gas. D) food and waste into ammonia.
7)	Aquatic plants can actually help supplement your tank's biological filtration by absorbing ammonia and nitrate.
	True False
8)	Carbonate hardness (kH) measures
	A) the concentration of carbonate salts in the water. B) the buffering capacity of the water. C) the concentration of dissolved minerals (mostly Ca²⁺ and Mg²⁺). D) both A and B.
9)	General hardness (gH) refers to
	A) everything that is dissolved in the water. B) the specific gravity of the water. C) the concentration of dissolved minerals (mostly Ca²⁺ and Mg²⁺). D) the buffering capacity of the water.
10)	The best way to maintain a high pH (like the 8.3 or higher appreciated by African cichlids) is to
	A) add some high pH buffer to the water during water changes. B) have lots of driftwood in the tank. C) use a calcium carbonate substrate like aragonite sand. D) both A and C.