In the reaction 2Al + 3F2? 2AlF3, the fluorine
a. is reduced.
b. loses electrons.
c. is oxidized.
d. is the catalyst.
a
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A compound microscope is made with an objective lens ( = 0.90 cm) and an eyepiece ( = 1.1 cm). The lenses are separated by a distance of 10 cm. If an object is 1.0 cm in front of the objective lens, where will the final image of the eyepiece be located?
a. ?30 b. ?15 c. ?23 d. ?11 e. ?9
What holds the Sun together?
A. its gravitational force B. gas pressure. C. electrostatic forces between ions in its interior D. Nothing, the Sun is actually expanding very slowly.
In the context of a planetary atmosphere, what is a bar?
A) a unit of pressure roughly equal to the atmospheric pressure at sea level on Earth B) the surface pressure on any planet C) a description of the atmospheric composition on Earth D) a place where planetary scientists can get sodas and other drinks
Gas that has never been cycled through a galaxy or a star is said to be ________
Fill in the blank(s) with correct word