For each of the following processes, indicate whether the signs of S and H are e

Question

For each of the following processes, indicate whether the signs of S and H are expected to be positive, negative, or about zero.



(a) An explosive is detonated in a sealed container and the container becomes hot.

For this process S should be and H should be .



(b) Some nitrogen gas and some oxygen gas held in separate containers are allowed to mix.

For this process S should be and H should be .



(c) 1 mol CH4(g) and 2 mol O2(g) is formed from 1 mol CO2(g) and 2 mol H2O(l).

For this process S should be and H should be .



(d) An unstable liquid decomposes generating a gas and liberating heat.

For this process S should be and H should be .



(e) Liquid is formed by compressing a refrigeration gas.

For this process S should be and H should be .

Explanation / Answer

A) ?S is pos (solid to gas means more disorder). ?H is pos (heat must flow TO the material to make it sublime) B) ?S is pos (more particles means more disorder). ?H is pos (heat must flow TO the material to make it dissociate) C) ?S is pos (more gas and more particles). ?H is neg (heat is released)

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