Jump to content
Sign in to follow this  

SL Chemistry Paper 2

Recommended Posts

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 

Share this post


Link to post
Share on other sites

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?

Share this post


Link to post
Share on other sites

The answer for the hydrate question is 2 (I can't divide two numbers -_-) Lets not say what I got for the hydrate LOL

But yeah, I did #7. God bless IB for making most of that exam organic chem based. :')

Edited by V For Vendetta.

Share this post


Link to post
Share on other sites

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

Share this post


Link to post
Share on other sites

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.

  • Like 1

Share this post


Link to post
Share on other sites

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?  

  • Like 1

Share this post


Link to post
Share on other sites

I got 27 cm3. I drew the lines like this: http://upload.wikimedia.org/wikipedia/en/4/46/Aaaathermo_fig2.jpg

but 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. 

Share this post


Link to post
Share on other sites

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? :D 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 by caroline owly

Share this post


Link to post
Share on other sites

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? :D 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?

Share this post


Link to post
Share on other sites

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!

Share this post


Link to post
Share on other sites

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

Share this post


Link to post
Share on other sites

I was going to do 7 until I completely blanked out on a few questions. Stress is real  :D


Can anyone teach the hydration question? We weren't taught that, and completely messed up on that one.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

×

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.