e the observations about each chemical reaction in the table below to decide the

Question

e the observations about each chemical reaction in the table below to decide the sign (positive or negative) of the reaction thalpy AH and reaction entropy AS te: if you have not been given enough information to decide a sign, select the "unknown" option. action observations conclusions Crystalization of a pure compounis spontaneous only below 36. °C. is pick one) As is (pick one) is (pickore)"] The reverse of this reaction is always spontaneous but proceeds faster at AS is (pick one) | is (pick one)" AS is (pick one) temperatures above 2. °C. This reaction is exothermic and proceeds slower at temperatures below 42. °C

Explanation / Answer

Ans

If the reaction is exothermic then the lowering of temprature would increase the rate

and lowring the temprature always decrease the entropy

So, for the crystalization process lowring the temprature is helping the process, so the enthalpy chane must be positive

and lowinring the temprature will decrease the entropy change

For second row: the reverse of the reaction is always spontaneos but proceeds faster at temprature above -2.

This shows that the enthaly change is negative and entropy change is positive.

for third row: the reaction is exothermic so the enthaly change is positive. So, lowring the T will help the reaction but it is increasing the rate. The reason is lowing the temprature decrease the entropy change ( entropy change is negative ) and in this entropy is playing imporatnt role.

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