A container with a one-liter capacity at 27° C is filled with helium to a pressure of 2.0 atm. (1 atm = 1.0 × 10^5 N/m2.) How many moles of helium does it hold?
a. 0.041
b. 0.081
c. 0.45
d. 0.90
e. 1.0
b
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Why is it easier to locate meteorites in Antarctica than anywhere else on Earth? a. Antarctica is an easy location for humans to access
b. More scientists are in the area to find meteorites. c. When meteorites land, they melt a small crater on the ice. d. Meteorites are easy to detect on top of the ice where there are no Earth rocks. e. Meteorites fall most often through the ozone hole above the South Pole.
What is the ground state energy of the Li++ ion, which has atomic number 3?
A) -61 eV B) -40.8 eV C) -1.51 eV D) -122 eV E) Li++ does not have a ground state.
How many 2d electron states can an atom have?
A) 8 B) 0 C) 4 D) 10 E) 6
If you quickly run away from the orchestra at a concert, the frequency of the sound you hear will be
A) decreased. B) increased. C) neither of these.