IbTrojan Posted May 15, 2015 Report Share Posted May 15, 2015 Again, no one started this so I thought I'd take the initiative. Thoughts on paper 2? TZ1 and TZ2 I'm TZ1 and let me tell you, I did NOT like that stupid hydrate question :/ But Question 6 of the Section B was nice Reply Link to post Share on other sites More sharing options...
swegmagician1337 Posted May 15, 2015 Report Share Posted May 15, 2015 Again, no one started this so I thought I'd take the initiative. Thoughts on paper 2? TZ1 and TZ2 I'm TZ1 and let me tell you, I did NOT like that stupid hydrate question :/ But Question 6 of the Section B was nice What did you get for the hydrate question? Reply Link to post Share on other sites More sharing options...
V For Vendetta. Posted May 15, 2015 Report Share Posted May 15, 2015 (edited) The answer for the hydrate question is 2 (I can't divide two numbers ) Lets not say what I got for the hydrate LOLBut yeah, I did #7. God bless IB for making most of that exam organic chem based. :') Edited May 15, 2015 by V For Vendetta. Reply Link to post Share on other sites More sharing options...
ferelli14 Posted May 16, 2015 Report Share Posted May 16, 2015 What was the third point for the collision theory? AFAIK it's only sufficient kinetic energy and correct collision geometry... Reply Link to post Share on other sites More sharing options...
anb2016 Posted May 16, 2015 Report Share Posted May 16, 2015 What was the third point for the collision theory? AFAIK it's only sufficient kinetic energy and correct collision geometry...I think the third mark is just saying that particles must collide Reply Link to post Share on other sites More sharing options...
ferelli14 Posted May 16, 2015 Report Share Posted May 16, 2015 YES!!! I needed that third mark!\ Reply Link to post Share on other sites More sharing options...
tybchavez Posted May 16, 2015 Report Share Posted May 16, 2015 Anybody do #5 on section B? Reply Link to post Share on other sites More sharing options...
annanguyen228 Posted May 16, 2015 Report Share Posted May 16, 2015 I'm TZ2. part A was actually quite good. The only thing we had to calculate was enthalpy change and the amount of HCl needed to neutralize 25cm3 of NaOH?I did question 5 for section B. God bless equilibrium! They had equilibrium this year and I couldnt be any happier.I was debating between organics and equilibrium though. To my surprise, organics section B this year didn't ask to draw the nucleophilic substitution. 1 Reply Link to post Share on other sites More sharing options...
ghettogreen Posted May 16, 2015 Report Share Posted May 16, 2015 I'm TZ2. part A was actually quite good. The only thing we had to calculate was enthalpy change and the amount of HCl needed to neutralize 25cm3 of NaOH?I did question 5 for section B. God bless equilibrium! They had equilibrium this year and I couldnt be any happier.I was debating between organics and equilibrium though. To my surprise, organics section B this year didn't ask to draw the nucleophilic substitution. hey you got 25cm3 to neutralize? I got 30... btw what was your percentage error? Was it around 70%? Also was your temperature change 5.2 celcius? 1 Reply Link to post Share on other sites More sharing options...
caroline owly Posted May 16, 2015 Report Share Posted May 16, 2015 I got 27 cm3. I drew the lines like this: http://upload.wikimedia.org/wikipedia/en/4/46/Aaaathermo_fig2.jpgbut Im not sure if its correct. Well do you think there are Follow Through marks if we did the first parts of this question incorectly? Coz Im sure I misread the delta temperature... (I didnt draw a line parallel to x-axix at the poinf of interesction) I also did question 5. Section B was quite easy, Id say. The beginning was a bit terrifying. Reply Link to post Share on other sites More sharing options...
caroline owly Posted May 16, 2015 Report Share Posted May 16, 2015 (edited) One more thing! When you were using the formula q = mct, what did you put for m? The masses used in the whole experiment, overall? (25 + 50 = 75cm3) Or only the masses added up to a point of neutralisation (eg. 25cm3 + 27cm3 = 52 cm3) ? And what number of moles should be used in calculating delta H? the number of moles of either NaOH or HCl or maybe the sum of the moles? I dunno!! I used only moles of one of them, which was I believe 0.0250 (the moles were identical for NaOH and HCl anyways) Edited May 16, 2015 by caroline owly Reply Link to post Share on other sites More sharing options...
ghettogreen Posted May 16, 2015 Report Share Posted May 16, 2015 One more thing! When you were using the formula q = mct, what did you put for m? The masses used in the whole experiment, overall? (25 + 50 = 75cm3) Or only the masses added up to a point of neutralisation (eg. 25cm3 + 27cm3 = 52 cm3) ? And what number of moles should be used in calculating delta H? the number of moles of either NaOH or NaCl or maybe the sum of the moles? I dunno!! I used only moles of one of them, which was I believe 0.0250 (the moles were identical for NaOH and NaCl anyways)what was the concentration of HCL? was it 0.5 mol dm-3? Reply Link to post Share on other sites More sharing options...
caroline owly Posted May 16, 2015 Report Share Posted May 16, 2015 Hmmm I guess so, but I dont remember Reply Link to post Share on other sites More sharing options...
maturk Posted May 16, 2015 Report Share Posted May 16, 2015 I was in TZ2 and I feel pretty confident about this years paper. The first question tough, like almost always, was a little tricky. I said that the amount of HCL needed to neutralize the base was 30.0 cm^3, that the amount of moles of it was something like 0.0250 (or maybe it was 0.00250 can't remember), the temperature change was 5.2 C, and that the enthalpy change per mole was -48 KJ per mol. This gave me a percentage error of 17 percent. No idea if I did it correctly though. Does anyone know how you were actually supposed to do it? But I'm pretty sure there will be a lot of points available for errors carried over even if I messed up somewhere in the calculations. Everything else was aight. I did question 5 in section B and it felt breezy. Cheers! Reply Link to post Share on other sites More sharing options...
caroline owly Posted May 16, 2015 Report Share Posted May 16, 2015 Oh man, I also got -48 kJ/mol ;o 1 Reply Link to post Share on other sites More sharing options...
caroline owly Posted May 16, 2015 Report Share Posted May 16, 2015 Even though I used 27cm3, not 30cm3 Reply Link to post Share on other sites More sharing options...
annanguyen228 Posted May 17, 2015 Report Share Posted May 17, 2015 I got 30cm3I dont remember what I got for enthalpy change per mol but I think I got 5.2c for the change in temperature. Reply Link to post Share on other sites More sharing options...
annanguyen228 Posted May 17, 2015 Report Share Posted May 17, 2015 I got 30cm3I dont remember what I got for enthalpy change per mol but I think I got 5.2c for the change in temperature.But my percentage error was high though ;( Reply Link to post Share on other sites More sharing options...
Molly_Wins Posted May 17, 2015 Report Share Posted May 17, 2015 Anybody do #5 on section B? I did, but I was TZ1 so idk if we had the same one. I was leaning towards question 7 at first but I forgot how to do the mass calculations so oops. But I felt better about #5 than #7 Reply Link to post Share on other sites More sharing options...
Tom Hiddleston Posted May 17, 2015 Report Share Posted May 17, 2015 I was going to do 7 until I completely blanked out on a few questions. Stress is real Can anyone teach the hydration question? We weren't taught that, and completely messed up on that one. Reply Link to post Share on other sites More sharing options...
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