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Answer to Question #21123 in Inorganic Chemistry for Danielle Louise Akerson

Question #21123
Regarding phase changes, which of the following statements is false?

a) Sublimation is an endothermic process.
b) Deposition is an exothermic process.
c) Crystallization is an exothermic process.
d) Vaporization is an endothermic process.
e) None of the above answers is the correct answer.
Expert's answer
a) - Correct.
Sublimation is the conversion of a solid directly to a gas without going
through the liquid state. Sublimation is always an endothermic process, since
energy must be supplied to overcome the intermolecular forces that hold
molecules together as a solid.

b) - Correct.
Deposition is a process of phase change of a matter from gas phase to solid
phase directly. Since it is the reverse process of sublimation, it is
exothermic.

c) - Correct.
The crystallization is a process of the formation of new bonds. The formation
of new bond is a low energy state and therefore when new stable bonds are
formed between atoms, energy is released. That is why crystallization is
exothermic process.

d) - Correct.
Vaporization is the conversion of a liquid to a gas. Vaporization is an
endothermic process, since energy must be supplied to overcome the
intermolecular forces that hold molecules together as a liquid.

e) - False.
Since all statements above are correct, this statement is false.

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