What is the approximate pKa of a thiol?
A) 5
B) 7
C) 10
D) 14
C
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What characteristic feature of Pennsylvanian rocks distinguishes rocks of the Absaroka sequence from those of the Kaskaskia sequence, as well as others in North America?
A)cyclothems B)carbonates C)coal D)conodonts E)chordates
The Maunder minimum refers to a time when ____
A) the tilt of Earth's axis was less than it is now B) there were fewer sunspots C) Earth was closer to the sun than it is now D) few snowstorms occurred over the United States
There is a sharp and definable boundary between the atmosphere and outer space
Indicate whether the statement is true or false
According to the "rule of 70," if a country has a population increase of 2% per year, how long will it take for it to double in size?
A) 35 years B) 70 years C) 72 years D) 140 years E) it can not be determined