Chemistry HL Papers 1 + 2 TZ1

[Emmi]

I believe it's been 24 hours so I think we can discuss the first two papers now.

How did everyone find the exam? I thought Paper 1 was OK except for a few tricky questions (like the one with the two beakers of acid and the one about the weak acid with the choices being like pH < 2, pOH > 12, etc). Paper 2 was a love-hate paper. Question 1 was SOOO HARD, I think I only got a few marks on it. But the rest of section A was all right, and section B was superb! I did questions 7 (the one on organic with compound X) and 8 (the one that started with the mass of titanium). Anyone do these as well?

What about you guys?

[Summer Glau]

You would do the organic chem question in option B

It took me forever to figure out how to do the very first question about calculating rate and to figure out that they were obtaining the rate of reaction from Br₂, not the other random coumpound that was there!

I did questions 5 and 8, thought 5 was alright but how did you calculate the enthalpies of combustion when there weren't numbers there for all the compounds (not including stuff like O₂) Number 8 was pretty good, almost everyone in my class did that one.

And what was up with that question about the lead battery

I found paper 1 to be pretty good actually, better than most =D Hopefully it makes up for paper 2 lol.

[Draconian28]

Paper 1 was OK, I guess, but as always there were some very tricky questions, so I just ended up guessing some of the answers. Paper 2, though was much better. I also liked section B a lot; I did questions 5 and 7. For the one where you had to calculate the enthalpy change of the reaction, you had to construct a very weird enthalpy cycle where you put the formation of each of the two silicon compounds and the combustion of hydrogen gas to form water. Then, you just had to apply Hess' Law using the data from the cycle. It took me about 20 minutes to figure it out, but in the end I managed to do it.

[Emmi]

Which one was the lead battery? I remember the lead compound question though, the one where lead was added to gasoline (I think it was question 2 on section A). I had no problem coming up with an empirical formula or reaction for it, but I blanked on the molecular formula. I said it was just the same as the empirical, although I doubt it. Did anyone get a definitive answer for that?

And Sam of course I'd do the organic question! I love organic chemistry

[jess1ca]

Paper 1 was OK, I guess, but as always there were some very tricky questions, so I just ended up guessing some of the answers. Paper 2, though was much better. I also liked section B a lot; I did questions 5 and 7. For the one where you had to calculate the enthalpy change of the reaction, you had to construct a very weird enthalpy cycle where you put the formation of each of the two silicon compounds and the combustion of hydrogen gas to form water. Then, you just had to apply Hess' Law using the data from the cycle. It took me about 20 minutes to figure it out, but in the end I managed to do it.

I did 5 and 7 as well! I was going to do #6... I don't know why I decided against it.

Do you remember your answer for the energy cycle? I think I got -5520 kj/mol or something... unless I'm thinking of a different question. I rushed it, so I'm worried I did something wrong.

The question that's been bothering me was the question about local and global pollutants.... I know it probably sounds dumb but I didn't know what to put, so I just made some answer up. What did everyone here put for that question?

I actually liked paper 1 more. There were some questions where I had to think a little longer, but nothing that made me panic. Both were ok... but I have to say that 2011 and 2009 exams were much easier!

When I first opened up paper 2, I panicked and got stuck on the first question. So I started with the organic question I believe and eventually figured out all the other questions.

Which one was the lead battery? I remember the lead compound question though, the one where lead was added to gasoline (I think it was question 2 on section A). I had no problem coming up with an empirical formula or reaction for it, but I blanked on the molecular formula. I said it was just the same as the empirical, although I doubt it. Did anyone get a definitive answer for that?

I got the same molecular and empirical formula: PbC8H20... because it's a one to one mole ratio between the compound and PbO2... right?

Edited May 10, 2012 by SmilingAtLife:)

[Draconian28]

Paper 1 was OK, I guess, but as always there were some very tricky questions, so I just ended up guessing some of the answers. Paper 2, though was much better. I also liked section B a lot; I did questions 5 and 7. For the one where you had to calculate the enthalpy change of the reaction, you had to construct a very weird enthalpy cycle where you put the formation of each of the two silicon compounds and the combustion of hydrogen gas to form water. Then, you just had to apply Hess' Law using the data from the cycle. It took me about 20 minutes to figure it out, but in the end I managed to do it.

I did 5 and 7 as well! I was going to do #6... I don't know why I decided against it.

Do you remember your answer for the energy cycle? I think I got -5520 kj/mol or something... unless I'm thinking of a different question. I rushed it, so I'm worried I did something wrong.

The question that's been bothering me was the question about local and global pollutants.... I know it probably sounds dumb but I didn't know what to put, so I just made some answer up. What did everyone here put for that question?

I actually liked paper 1 more. There were some questions where I had to think a little longer, but nothing that made me panic. Both were ok... but I have to say that 2011 and 2009 exams were much easier!

When I first opened up paper 2, I panicked and got stuck on the first question. So I started with the organic question I believe and eventually figured out all the other questions.

Which one was the lead battery? I remember the lead compound question though, the one where lead was added to gasoline (I think it was question 2 on section A). I had no problem coming up with an empirical formula or reaction for it, but I blanked on the molecular formula. I said it was just the same as the empirical, although I doubt it. Did anyone get a definitive answer for that?

I got the same molecular and empirical formula: PbC8H20... because it's a one to one mole ratio between the compound and PbO2... right?

Yes, I believe that was the answer I got for that question!

Haha, I also had no idea about local and global pollutants, so I just BSed that CO2 was a local pollutant and SO2 was a global pollutant, but I'm entirely sure that that's wrong. I would really like to know where in the syllabus it says that we have to learn local and global pollutants, because I read it about three times before the exam and there wasn't anything like that on it...

And I also got that the molecular formula was the same as the empirical formula.

[Emmi]

Paper 1 was OK, I guess, but as always there were some very tricky questions, so I just ended up guessing some of the answers. Paper 2, though was much better. I also liked section B a lot; I did questions 5 and 7. For the one where you had to calculate the enthalpy change of the reaction, you had to construct a very weird enthalpy cycle where you put the formation of each of the two silicon compounds and the combustion of hydrogen gas to form water. Then, you just had to apply Hess' Law using the data from the cycle. It took me about 20 minutes to figure it out, but in the end I managed to do it.

I did 5 and 7 as well! I was going to do #6... I don't know why I decided against it.

Do you remember your answer for the energy cycle? I think I got -5520 kj/mol or something... unless I'm thinking of a different question. I rushed it, so I'm worried I did something wrong.

The question that's been bothering me was the question about local and global pollutants.... I know it probably sounds dumb but I didn't know what to put, so I just made some answer up. What did everyone here put for that question?

I actually liked paper 1 more. There were some questions where I had to think a little longer, but nothing that made me panic. Both were ok... but I have to say that 2011 and 2009 exams were much easier!

When I first opened up paper 2, I panicked and got stuck on the first question. So I started with the organic question I believe and eventually figured out all the other questions.

Which one was the lead battery? I remember the lead compound question though, the one where lead was added to gasoline (I think it was question 2 on section A). I had no problem coming up with an empirical formula or reaction for it, but I blanked on the molecular formula. I said it was just the same as the empirical, although I doubt it. Did anyone get a definitive answer for that?

I got the same molecular and empirical formula: PbC8H20... because it's a one to one mole ratio between the compound and PbO2... right?

Yes, I believe that was the answer I got for that question!

Haha, I also had no idea about local and global pollutants, so I just BSed that CO2 was a local pollutant and SO2 was a global pollutant, but I'm entirely sure that that's wrong. I would really like to know where in the syllabus it says that we have to learn local and global pollutants, because I read it about three times before the exam and there wasn't anything like that on it...

And I also got that the molecular formula was the same as the empirical formula.

For the local pollutant I put CO (carbon monoxide, ruins the air and smog and stuff) and for the global I put CO2 (for destroying the ozone and global warming and all that).

And I didn't see it in the syllabus anywhere. See I knew they were going to have a weird random question like that, they usually have at least one!

[jess1ca]

Paper 1 was OK, I guess, but as always there were some very tricky questions, so I just ended up guessing some of the answers. Paper 2, though was much better. I also liked section B a lot; I did questions 5 and 7. For the one where you had to calculate the enthalpy change of the reaction, you had to construct a very weird enthalpy cycle where you put the formation of each of the two silicon compounds and the combustion of hydrogen gas to form water. Then, you just had to apply Hess' Law using the data from the cycle. It took me about 20 minutes to figure it out, but in the end I managed to do it.

I did 5 and 7 as well! I was going to do #6... I don't know why I decided against it.

Do you remember your answer for the energy cycle? I think I got -5520 kj/mol or something... unless I'm thinking of a different question. I rushed it, so I'm worried I did something wrong.

The question that's been bothering me was the question about local and global pollutants.... I know it probably sounds dumb but I didn't know what to put, so I just made some answer up. What did everyone here put for that question?

I actually liked paper 1 more. There were some questions where I had to think a little longer, but nothing that made me panic. Both were ok... but I have to say that 2011 and 2009 exams were much easier!

When I first opened up paper 2, I panicked and got stuck on the first question. So I started with the organic question I believe and eventually figured out all the other questions.

Which one was the lead battery? I remember the lead compound question though, the one where lead was added to gasoline (I think it was question 2 on section A). I had no problem coming up with an empirical formula or reaction for it, but I blanked on the molecular formula. I said it was just the same as the empirical, although I doubt it. Did anyone get a definitive answer for that?

I got the same molecular and empirical formula: PbC8H20... because it's a one to one mole ratio between the compound and PbO2... right?

Yes, I believe that was the answer I got for that question!

Haha, I also had no idea about local and global pollutants, so I just BSed that CO2 was a local pollutant and SO2 was a global pollutant, but I'm entirely sure that that's wrong. I would really like to know where in the syllabus it says that we have to learn local and global pollutants, because I read it about three times before the exam and there wasn't anything like that on it...

And I also got that the molecular formula was the same as the empirical formula.

For the local pollutant I put CO (carbon monoxide, ruins the air and smog and stuff) and for the global I put CO2 (for destroying the ozone and global warming and all that).

And I didn't see it in the syllabus anywhere. See I knew they were going to have a weird random question like that, they usually have at least one!

Wow, that's exactly what I put. I hope it's considered correct by IB

[IBCONQUERER]

Yeah in TZ2 they had radioisotopes which were 5 marks together and completely ignored the redox calculations and first order second order kinetics! So yes they always have a few weird questions lol

[CkyBlue]

Paper one was so messed up, past papers were too easy relative to it. Thankfully I studied well enough. This is really late, but I've been busy doing useless junk, so I'll begin my rant. I scored 34 out of 40 on a past paper, and I messed up 3 stupid questions (they were the very first ones ) This paper was just ergh. My friend said he guessed like 35 of the questions I didn't think it was terrible, but it was relatively difficult. I remember there was that one question that gave you 3 substances, and you had to determine if they were acidic or basic.

First time the Pearson Baccalaureate screwed me. Apparently, there was no option for "amphoteric" for SiO4, and although I should have knew it should have been acidic, I selected that it was basic. UGH. That's the only one I remember a month ago, but I am pretty sure I didn't get that 7 on paper 1 T_T

Paper 2 was ergh too. The first question about an indicator substance was ... #&*#, something to test for colour..... then basically no one from my entire cohort knew how to do the rate question... I just divided big numbers.

I blanked out on the empirical formula question, which was 10 marks... I don't even know why... I could have used math to solve it but for some reason, I just couldn't

I am praying for a 6 from the IB gods.

[apple.toronto]

Paper one was so messed up, past papers were too easy relative to it. Thankfully I studied well enough. This is really late, but I've been busy doing useless junk, so I'll begin my rant. I scored 34 out of 40 on a past paper, and I messed up 3 stupid questions (they were the very first ones ) This paper was just ergh. My friend said he guessed like 35 of the questions <img data-cke-saved-src="http://www.ibsurvival.com/public/style_emoticons/default/smiley_<img src=" src="http://www.ibsurvival.com/public/style_emoticons/default/smiley_%3Cimg%20src=" http:="" www.ibsurvival.com="" public="" style_emoticons="" default="" smiley_.gif'="" class="bbc_emoticon" alt="">.gif' class='bbc_emoticon' alt='' /> I didn't think it was terrible, but it was relatively difficult. I remember there was that one question that gave you 3 substances, and you had to determine if they were acidic or basic.

First time the Pearson Baccalaureate screwed me. Apparently, there was no option for "amphoteric" for SiO4, and although I should have knew it should have been acidic, I selected that it was basic. UGH. That's the only one I remember a month ago, but I am pretty sure I didn't get that 7 on paper 1 T_T

Paper 2 was ergh too. The first question about an indicator substance was ... #&*#, something to test for colour..... then basically no one from my entire cohort knew how to do the rate question... I just divided big numbers.

I blanked out on the empirical formula question, which was 10 marks... I don't even know why... I could have used math to solve it but for some reason, I just couldn't

I am praying for a 6 from the IB gods.

Shall join in the rant!

Completely agree. Forgot all the questions on paper 1 except for that pi and sigma orbital one. But, I think I left 12-13 questions cuz they were hard, came back once I was done. So, I am guessing I got 30-31/40 hopefully! I did tons of past papers (from 1999-2011 november excluding 2009 and 2008 nov). Hopefully, a low 6

You have that text too! Nah, the only amphoteric one is aluminum. The ones before aluminum are basic and the ones after are acidic.

PAPER 2 WAS JUST....... I knew the rate expression and tried the percent uncertainty but for the final rate, just made up something random after I found the rate expression and constant. I messed up on section b (choose # 5 and the first enthalpy question totally confused me) Prob lost 30 marks/if not more.

SAME, I really need my 6. Hopefully, grade boundaries are lower, as long as I scrape a 6, I will be totally happy. Most of this year exams seemed worse than last year.

GOOD LUCK!