Question

At constant pressure, the sign of q for the process H2O(l) → H2O(s) is expected to...

At constant pressure, the sign of q for the process H2O(l) → H2O(s) is expected to be... PICK ONE.

A negative, and the process is endothermic.
B positive, and the process is exothermic.
C positive, and the process is endothermic.
D negative, and the process is exothermic.
E impossible to predict.
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Answer #1

If heat is released in a reaction then the reaction is said to be exothermic, if heat is absorbed in a process then that process is said to be endothermic.

H2O converted from liquid state to solid state, so it is solidification process or freezing process.

Generally in freezing process heat is released. Hence the process is exothermic.

If heat is released then q will have negative sign, if heat is absorbed q will have positive sign. In this process heat is released so q will have negative sign.

Answer: D) negative, and the process is exothermic.  

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