Destroyer GC #41 and 46

[Mrbubbles]

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Hi,

Ok for 41, in the question where it says, "temp is decreased to 25 degrees" --> does that mean the rxn is endo (cuz absorbing heat)? "and then Kw decrease" , so that means [reactants] > [products] so shift right? i'm so confused... =(

and 46, i don't understand why the phase diagram liquid-gas line shifts left. help?

 

[TeamGuo]

for the first problem it's endothermic because since the reaction absorbs heat, the solution Temperature drops.

You have to take look at the reaction and the surrounding when determining the endo Vs exo.

Think of it as, if you jumped into a pool and you absorbed some heat from the pool, the pool's temperature drops. Since you are the reaction, it's endothermic.

Second one, I believe due to H-bonding the liquid phase is increasing it's range in temperature. I don't know a better way of explaining it though. Hopefully someone else does.