The IUPAC name for one of the freons is 1,1,1-trichloro-2-fluoroethane. How many other constitutional isomers are there of this compound?
A) 1
B) 2
C) 3
D) 4
B
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What is the latitude of the tangent rays in the Southern Hemisphere?
Figure 9-2: Earth–Sun relations on June solstice.
The above question is based on Figure 9-2, showing Earth–Sun relations on June 21.
What will be an ideal response?
Absorption:
A) is performed quite well by the atmosphere for visible wavelengths. B) is done to differing degrees by different gases. C) does not prevent most ultraviolet light from reaching Earth's surface. D) is typically greater in desert areas than in humid areas.
Most stream channels in desert regions have perennial flow
Indicate whether the statement is true or false
Lhasa was controlled by Britain until 1997, when it was returned to China
Indicate whether the statement is true or false