Which ester is formed by the reaction of CH3COOH and CH3CH2CH2OH?
A) ethyl acetate
B) ethyl propanoate
C) propyl acetate
D) none of these
C
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If an air parcel is completely at rest, which of the following forces can make the parcel begin to move?
A. gravity B. friction C. centripetal D. pressure gradient
Explain how changes in the Sun’s angle above the horizon and daylength vary with the seasons at the equator, 30°, 60°, and 90°. What is the general relationship between latitude and the amount of seasonal change?
What will be an ideal response?
A formal region is:
A) derived from people's sense of identity and attachment to different areas. B) nonexistent in developing nations. C) an area that possesses one or more unifying cultural or physical traits. D) an area unified by a specific social, cultural, or economic activity. E) an area that possesses only one specific cultural trait.
Which one of the following best illustrates a type of adaptation to global climate change?
A) Increasing the use of public transportation systems in cities B) Building taller levees to hold back storm surges along ocean coastlines C) Using solar and nuclear power to generate electricity instead of burning coal D) Widening the Panama Canal to allow larger ships to move from China to Europe