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A. melting B. freezing C. boiling D. condensing. Weegy: During FREEZING phase change the arrangement of water molecules become more orderly. User: The phase change in which a substance changes from a gas directly to a solid is A. condensation. B. vaporization.
Clearly, the molecular disorder in a gas will be greater than that in a liquid, so there must be an entropy increase upon vapourisation. Likewise, when a liquid freezes the mobile molecules of the liquid phase are forced to assume fixed positions in the solid phase. This will normally reduce the molecular disorder of the system, so there will usually be an entropy decrease that accompanies freezing.