The general formula R-NH2 is that of
a. an amine.
b. an alkyl halide.
c. an alcohol.
d. none of these
a
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Compound Microscope: A compound microscope has an objective with a focal length of 3.00 mm and an eyepiece of focal length 6.00 cm. It is adjusted for minimum eyestrain for persons with a near point of 25 cm. If the two lenses are separated by 40.0 cm, what is the total overall magnification?
A. 28 B. 56 C. 470 D. 550 E. 2200
2.00 moles of an ideal gas freely expands from 1.50 liters to 4.00 liters. The change in entropy in the expansion
A. 5.80 J/K B. 8.50 J/K C. 16.3 J/K D. 18.7 J/K
An observer in the Northern Hemisphere takes a time exposure photograph of the night sky. If the illustration below depicts the photograph taken by the observer, which direction was the camera pointing?
a.
straight north
b.
straight east
c.
straight south
d.
straight west
e.
straight up, directly overhead
What happens because of the formation of atoms?
A.) Nucleosynthesis. B.) Formation of protons. C.) Formation of quarks. D.) The cosmic microwave background is produced. E.) The Universe starts to contract.