<p>oh yeah, is Cl- a very electronegative element? I know fluorine is.. haha</p>
<p>mathnerd, what were the two statements for the hydrolysis one.</p>
<p>for the water one it's definitely TT, the second statement about H2 and O2 being higher entropy does not explain the 1st one</p>
<p>cl- is a very electronegative</p>
<p>it was like
I
electrolysis of water is endothermic
II
producing gas from liquid causes a positive entropy</p>
<p>Yeah I bet it's T, T
But I don't like the question! If you consider G=H-TS then you can see the positive entropy causes the H to be waay positive and that's why I put T,T,CE</p>
<p>cla_ms:
Yeah but you can't have a negative Gibbs free energy bc it's definitely not spontaneous.. so I thought H had to be positive.</p>
<p>postive entropy make the reaction more exothermic, but the first part of the question was dealing with how electrolysis is endothermic. they aren't related so you can't put CE</p>
<p>Directions: Each question below consists of two statements, statement I in the left-hand column and statement II in the right-hand column. For each question, determine whether statement I is true or false and whether statement II is true or false and fill in the corresponding T or F ovals on your answer sheet. Fill in oval CE only if statement II is a correct explanation of statement I.</p>
<p>How does positive entropy make reaction more exothermic though?</p>
<p>mathnerd4869 can you remember other questions from that section? i'm drawing a blank...</p>
<p>The fact that entropy is positive is an explanation for why the enthalpy should be positive.. we are assuming that the reaction is not spontaneous. it couldn't be spontaneous because then we can't drink any water then</p>
<p>from gibbs G=H-TS. The more negative G is, the more spontaneous, therefore the larger the TS value, the more negative because H is SUBTRACTING TS. If entropy is negative the it would be -(-TS). Two negatives make a postive, so it would be less exothermic. sorry, my explanation is kinda bad, look in your chem book for a better answer</p>
<p>uhh... I got so rushed and I was panicking so I basically don't remember any other questions...</p>
<p>While producing gas does cause a positive entropy change, it does not explain why electrolysis of water is endothermic. Electrolysis is endothermic because you are specifically providing a current to cause the reaction.</p>
<p>does anyone remember the empirical formula one? i think i got CH3</p>
<p>If any one actually cares, I AM SCREWED. I already know I skipped+missed 6 questions. I better get >780.. So who else in here thinks this test was hard</p>
<p>tux08902:
that's only a source of energy. Endothermic only tells you that the potential energy of product is higher than potential energy of the reactants. I think. </p>
<p>I'm not going to argue about the entropy one any more.. it's just the way you think about it and I bet majority of people would say it's TT</p>
<p>oh i got ch3 for the 1st empirical formula one and 7 for the other one (16% hydrogen i think)</p>
<p>Although you could argue that it's endothermic because there is a positive delta H.</p>
<p>Ok. My last comment. I won't say anything now :)</p>
<p>basically....we all got screwed</p>
<p>apparently this was a very easy critical reading test, and we missed it</p>