A liquid boils when its vapor pressure
A)
equals the equilibrium vapor pressure.
B)
equals the external pressure.
C)
exceeds the external pressure.
D)
is between the equilibrium vapor pressure and the external pressure.
E)
None of the other choices is correct.
B
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A) 2.1 billion years ago B) 542 million years ago C) 1.2 billion years ago D) 65 million years ago
The theory of seafloor spreading was proposed in 1960 by
a. Alfred Wegener. b. Harry Hess. c. Albert Einstein. d. Andrija Mohorovicic.
In an energy level transition from the n = 2 state to the n =1 state for a hydrogen atom a photon will be ___________
Fill in the blank(s) with correct word
If the root mean square velocity of a particle in a gas is 450 m/s, and the particle collides with other particles every 
seconds on the average, then the mean free path is
A. 
B. 
C. 
D. 
E. 