Which of the following factors cause colloidal particles to remain in solution without settling?
A) Colloidal particles are of the same size of solvent molecules.
B) Colloidal particles have large solvation layers.
C) both a and b
D) neither a nor b
B
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A promising alternative to toxic pesticides used to reduce the billions of dollars in damage done by marine biofouling organisms is
A) marine predatory insects that eat the sessile biofoulers. B) polymers that make it difficult for the organisms to attach to a substrate. C) attracting fish to fouled sites to eat the fouling organisms. D) electrified ship hulls, intake pipes, and docks to electrocute the pests.
Which of the following would inhibit the production of biogas in a fermentation chamber commonly used by small farmers?
A) Double the overall size of the fermentation chamber B) Add equal parts of manure and water into the chamber and reseal the top C) Leave the lid off of the top of the fermentation chamber D) Collect biogas from an enclosed fermentation chamber
Much of the "biosolids" material that is the end product of a wastewater treatment plant is ________
A) used as crop fertilizer in the United States B) loaded onto barges and sent to underdeveloped countries to use as fertilizer C) trucked to special biohazard landfills for disposal D) placed in deep injection wells to keep it out of the water table E) used as part of the "fill" to develop wetlands into agriculture or housing areas
The largest sharks and rays are ________.
A. predators B. plankton feeders C. carnivores and predators D. carnivores and plankton feeders E. carnivores