Ion-dipole interactions are responsible for
a. the dissolving of salt in water.
b. ice being less dense than water.
c. the ease of electrolysis of water.
d. metallic bonding in steel.
a
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White dwarfs are dense, cool, and dim
a. True b. False Indicate whether the statement is true or false
The first self-replicating molecule was probably
A) a simple carbohydrate B) DNA C) a simple protein D) RNA
In an AC circuit the voltage varies as V = 96. sin (277 t) volts
(a) What is the rms voltage? (b) What is the frequency?
Which of the following is not true about differences between novae and supernovae?
A) Supernovae eject gas into space, but novae do not. B) Novae are much less luminous than supernovae. C) Novae occur only in binary star systems, while supernovae can occur both among single stars and among binary star systems. D) The same star can undergo novae explosions more than once, but can undergo only a single supernova.