The connecticut bueller theory assumes that particles of an ideal gas are

are in random, constant, straight-line motion

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In system A: A gas and a solid react to form a new solid product. the system entropy decreases.

In System B: Rubbing alcohol evaporates on the skin. liquid alcohol is converting to gas by evaporation so the system entropy increases.

Explanation:

Entropy  is a thermodynamic quantity measure the degree of disorder of a certain system.

Gases have larger entropy compared to liquids  which is larger than solids.

(A) When a gas convert to a solid, its entropy decreases. ... because solids have less energy and entropy than solids.

So, in system A: A gas and a solid react to form a new solid product. the system entropy decreases.

(B) Any chemical reaction that increases the number of gas molecules also increases entropy.

So, in System B: Rubbing alcohol evaporates on the skin. liquid alcohol is converting to gas by evaporation so the system entropy increases