Which of the following is not a property of a polymer?
(a) Large molecules with repeating units
(b) Can be either organic or inorganic
(c) A high density
(d) Good resistance to corrosion
(c) A high density
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_____________ do not have enough mass to sustain nuclear fusion in its core but are more massive than planets
Fill in the blank(s) with correct word
What happens to the core of a star after a planetary nebula occurs?
A) It contracts from a protostar to a main-sequence star. B) It breaks apart in a violent explosion. C) It becomes a white dwarf. D) It becomes a neutron star. E) none of the above
An excited atom can lose energy by
a. emitting a photon. b. absorbing a photon. c. undergoing the photoelectric effect. d. increasing its de Broglie wavelength. e. the uncertainty principle.
A negatively-charged plastic rod is brought close to (but does not touch) a neutral metal sphere that is connected to ground
After waiting a few seconds, the ground connection is removed (without touching the sphere), and after that the rod is also removed. The sphere is now A) negatively charged. B) positively charged. C) neutral.