The first shell of an atom can hold a maximum of how many electrons?
a. 1
b. 2
c. 6
d. 8
b
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Why are molecular lines more complex than elemental spectral lines?
A) Molecules have two or more atoms. B) Molecules can vibrate and rotate as well. C) Molecules are heavier than atoms. D) Molecules are the basis of life. E) Most of the universe is made of molecules, not individual atoms.
A thermodynamic engine has an efficiency of 31.4% and receives 8.72 kJ of energy per cycle. (a) How much work does it perform in each cycle? (b) How much energy does it exhaust in each cycle?
What will be an ideal response?
It is believed that excessive CO2 emissions will cause
a. a decrease in Earth's average temperature. b. a decrease in Earth's average rainfall. c. an increase in Earth's average rainfall. d. an increase in Earth's average temperature.
An initially uncharged hollow metallic sphere with radius of 5 cm has a small object with a charge of -10 µC carefully placed at the center of the sphere through a hole in the latter's surface. With the charge in place, what charge is now present on the outside surface of the sphere?
a. zero c. +4000 µC b. -10 µC d. +10 µC