Nonmetals produce negatively charged ions,
which are referred to as
a) lone pairs.
b) cations.
c) polar ions.
d) anions.
d
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The cosmic microwave background radiation comes from the time when neutral hydrogen atoms formed in the process of _______________
Fill in the blank(s) with correct word
A 4.00 kg mass is connected to a spring with a spring constant of 9.00 N/m. If the initial velocity is 12.0 cm/s and the initial displacement is 4.00 cm, then what is the maximum velocity of the simple harmonic motion?
A. 20.3 cm/s B. 19.8 cm/s C. 15.5 cm/s D. 13.4 cm/s E. 11.5 cm/s
Which of the following statements best explains what we mean when we say that the electroweak and strong forces "froze out" at 10-38 second after the Big Bang?
A) These two forces first became distinct at this time. B) These forces are important only at temperatures below the freezing point of water, which is a temperature that the universe reached at an age of about at 10-38 second. C) Freezing out was a term coined by particle physicists who think that the Big Bang theory is really cool. D) Following this time, neither the strong nor electroweak forces were ever important in the universe again.
The different colors of the spectrum
A) are sharply divided. B) blend from one to another. C) differ from the colors of a rainbow.