The heat required to change a substance from the solid to the liquid state is referred to as the
A) heat of fusion.
B) heat of vaporization.
C) heat of melting.
D) heat of freezing.
E) heat of condensation.
A
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Atoms that have the same number of protons but a different number of neutrons are called ____
a. ions b. elements c. isotopes d. molecules e. nucleons
One of the rare galaxies that is isolated in space is likely to be a(n) ____
a. starburst galaxy b. ultra luminous infrared galaxy c. dwarf galaxy d. antenna galaxy e. spiral galaxy
For hydrogen, the transition from the second to the fourth energy level produces:
A) a red emission line. B) a blue green absorption line. C) a violet emission line. D) an infrared emission line. E) an ultraviolet absorption line.
The temperature coefficient of resistivity for a "perfect" ohmic material would be:
a. positive and constant. b. zero. c. negative. d. positive and uniformly increasing.