Which of the following is a common feature of catechol, hydroquinone, and resorcinol?
A) They all have two methyl groups as substituents on a benzene ring.
B) They all have two hydroxyl groups as substituents on a benzene ring.
C) They all have one methyl and one hydroxyl as substituents on a benzene ring.
D) None of the above, these compounds do not have any common features.
B
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What is the name for the following polyatomic ion? PO4-3
A) phosphate B) phosphorus oxide C) phosphinate D) trioxo phosphoride E) potassium
Which of the following is not true of the CBD?
A) Compared to other parts of the city, the central area uses more space below and above ground level. B) Beneath most central cities runs a vast underground network of garages, loading docks, utilities, walkways, and transit lines. C) Consumer services in the CBD sell office supplies, computers, and clothing, or offer shoe repair, rapid photocopying, and similar services. D) Large department stores once located in the suburbs are now clustered in the CBD. E) In several CBDs, new shopping areas attract suburban shoppers as well as out-of-town tourists with unique recreation and entertainment experiences.
As demands for electricity push the limits of existing electric-power-generating plants in the United States, when is it most likely that a brown-out or blackout will disrupt electricity to your home computer?
A) During a weekend in the winter B) During a weekday in the winter C) During a weekend in the summer D) During a weekday in the summer
Which isotope of hydrogen is radioactive?
A) 1H B) 2H C) 3H D) none of these