Ammonia, NH3 is more polar than is borane, BH3 because
A) it has a lone pair of electrons.
B) it is less symmetrical than borane.
C) its hydrogens are not exactly opposite one another.
D) all of the above
D
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A key option during the transition from oil to renewable energy sources is
A. coal. B. nuclear energy. C. biomass. D. natural gas. E. ethanol.
Which two of these four structures are of the same structural isomer?
A. lower right and upper right B. lower left and upper right C. upper right and lower left D. upper left and lower right
Which of the following describes the net force on air moving in a circle at constant speed?
A. overall null B. inward toward the centre of rotation C. outward from the centre of rotation D. in the direction of wind motion
The Chinese only began making maps after 100 B.C
Indicate whether the statement is true or false.