Which of the following is not a characteristic of quartz?
A) hardness of 7
B) commonly occurs in six-sided crystals
C) one direction of cleavage
D) conchoidal fracture
E) made up of SiO2
C
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Earth satellites in an elliptical orbit have greatest speeds when
A. farthest from the Earth. B. nearest the Earth. C. neither of these D. can't say
Sundogs
A) are formed by refraction caused by water droplets. B) are formed by refraction caused by ice crystals. C) occur only at low levels in the atmosphere. D) occur only in latitudes close to the poles.
Currently there is extensive recycling of which of the following polymers?
A) high-density polyethylene B) polystyrene C) both a and b D) neither a nor b
If the bond angle at a carbon atom is 180°, how many groups are distributed around the carbon atom?
A) 1 B) 2 C) 3 D) 4