Equilibria, Energetics and Elements (F325) - June 2011 Exam.

I hate how it was so time pressured, I know I've made many silly mistakes that with more time I could have corrected, and even if there are lower grade boundaries (which I'm praying for) the margins will be small so those silly dropped marks will probably be quite significant! Boo there goes the grade I needed :frown:

Reply 2681

Dim0nIX

Original post by touran22

sorry for the delay i had to go out...im uploading it now!

Quote me when u do plz

Reply 2682

SarahJayneJonas

Original post by Dim0nIX

I wanted to do that too. Then I realised that you cannot use a concentration time graph for that. Otherwise it would have been in the book and that is why the initial rates method exists. Then I attempted finding gradients of tangents at regular interwals and drew a new graph of a rate-concentration graph. To my surprise it was a curve so I decided that the reaction is second order with respect to Br2.

I think this question was very very unfair since in all previous paper when half life was to be measured it was constant with very small fluctuations here it fluctuated by about 20 seconds give or take. thats 10% of the mean value!

Yeah i didn't think you could :frown:

But i thought from the fact you can convert it to a conc-rate graph which can then show the relationship this would be like working it out like that, using just 2values but if when one doubles so does the other then it shows a linear relationship on the rate-conc graph. ...it made sense in my head haha.
But yeah i imagine it was second order because my results didn't double anywhere near exactly :P

Reply 2683

touran22

ive got them all upped but theres 17 pics on photobucket but shall i just paste a link to each one or is there a way to make them into a slideshow or something?

Reply 2684

haydyb123

9

Original post by Salliana23

Pretty much the same - had no idea what to do for the magic tang question! I didn't really write anything down as I ran out of time!

I also got 67.5% but I only found 2/3 of the ionic equations

Yeah Magic Wang, was ridiculous... I don't think I saw you in the exam hall which is peculiar seeing as our second names both begin with B.

Reply 2685

kingam

Original post by touran22

ive got them all upped but theres 17 pics on photobucket but shall i just paste a link to each one or is there a way to make them into a slideshow or something?

just paste a link :biggrin:

Reply 2686

SmartFool

Why is it only with OCR that chemistry A2 papers are this hard? Is it fair that all the exam boards are completely different in their approach, if you look at AQA past papers they are so goddamn easy compared to OCR WTF is this right?

Reply 2687

Dim0nIX

Original post by touran22

ive got them all upped but theres 17 pics on photobucket but shall i just paste a link to each one or is there a way to make them into a slideshow or something?

Just link them separetly. Its good enough. I appreciate ur effort :smile:

Reply 2688

jw987654321

This is a joke, you can't complain because you found an exam hard. No question on the paper required anything more than the application of knowledge from textbook, or just being actually good at chemistry. Anyone can read the textbook over and over again, and regurgitate it onto a paper that follows exactly same format as all other past papers. Take some responsibility, everyone sits the same paper and UMS makes everything relative so how can it be unfair on anyone?

Reply 2689

intellectual1

3

Original post by apo1324

My school is changing to WJEC from OCR next year for Chemistry after the Jan F324 paper. :rolleyes:

Wow to AQA to WJEC...maybe OCR have done this because they want alot of UCAS offer holders to miss their offers?! hmmm

Reply 2690

SarahJayneJonas

Original post by SmartFool

Why is it only with OCR that chemistry A2 papers are this hard? Is it fair that all the exam boards are completely different in their approach, if you look at AQA past papers they are so goddamn easy compared to OCR WTF is this right?

Tbf i think the difficulty of OCR chemistry is reflected in the grade boundaries. Most easy stuff and recall everyone can do, it's only when questions are harder and require more thinking that the abilities of different students can actually be distinguished.
Saying this i think OCR is a bit ridiculous... exams so hard that 63% is an A is just extreme. I also think i will have got an E in today's paper! :frown:

Reply 2691

Ipcress

6

Original post by SmartFool

Why is it only with OCR that chemistry A2 papers are this hard? Is it fair that all the exam boards are completely different in their approach, if you look at AQA past papers they are so goddamn easy compared to OCR WTF is this right?

The chemistry is basically the same, but the questioning is more structured and logical and uses HSW questions which are relevant to the specification. OCR exam setters must stop trying to impress each other with aspects of their chemistry specialisms. They must remember that specialisms are developed at university not A level.

Reply 2692

Schoolio93

9

Original post by intellectual1

Wow to AQA to WJEC...maybe OCR have done this because they want alot of UCAS offer holders to miss their offers?! hmmm

that's not true, because even the GCSE papers are getting hard!!

I found this paper quite hard and the highest that I can get is low 80 high 70. I am really upset about it and I cried over it, coz Chem was my hope to get that A* required for Cambridge. I just hope that I can scrape an A, I need 124/150. And the problem is that I got 88/100 and 85/100 which is equal to 150/150 in both mock papers before the exam.

Reply 2693

Nash24

9

I really messed up the Kc and half life question and now I'm really stressing...would I get 'method marks' even if I used incorrect values for the Kc or raised concentration to the incorrect order..
Or will I just be marked down completely :/...

Sorry but why did I get negative rep for this?

(edited 12 years ago)

Reply 2694

touran22

ok heres the paper....http://s45.photobucket.com/albums/f94/touran22/f325/

password touran22

sorry for the quality of the paper...i don't own a scanner...just an iphone 5! when your on there just hit slideshow and your good to go!

(edited 12 years ago)

Reply 2695

haydyb123

9

Original post by Schoolio93

that's not true, because even the GCSE papers are getting hard!!

I found this paper quite hard and the highest that I can get is low 80 high 70. I am really upset about it and I cried over it, coz Chem was my hope to get that A* required for Cambridge. I just hope that I can scrape an A, I need 124/150. And the problem is that I got 88/100 and 85/100 which is equal to 150/150 in both mock papers before the exam.

Yeah I needed 129/150 for an A, doubt I got that.

Reply 2696

FCB

3

I'm not complaining about difficulty, I'm complaining about the time frame. I would have been able to work through that paper and complete all of it had I had maybe 2 hours and 15 minutes. As things stand, you have to work extremely quick just to answer all the questions, no time for checking, and no time to actually think about things.

What is more likely to be a useful application of chemistry, thinking about things to find the right answer through logic and actually applying past knowledge? Or skimming the question, and then copying out the mark scheme from a similar question on a past paper because you have no time to do anything else?

Reply 2697

monkeyDace

The F325 exam was fricking difficult and the A2 book didn't prepare us for it.....S**t I need A :frown:

And the time......I was rushing like there was no 2morrow and till didn't managed to the the last one

(edited 12 years ago)

Reply 2698

SmartFool

Original post by jw987654321

This is a joke, you can't complain because you found an exam hard. No question on the paper required anything more than the application of knowledge from textbook, or just being actually good at chemistry. Anyone can read the textbook over and over again, and regurgitate it onto a paper that follows exactly same format as all other past papers. Take some responsibility, everyone sits the same paper and UMS makes everything relative so how can it be unfair on anyone?

I'm sorry but when it gets to the point where you have revised like mad, done all the past papers available and feel comfortable with the concepts, yet you dont even do well enough to pass then there is a problem. After looking at AQAs past papers, I feel so bitter towards OCR the style of questions is so unique it really is a case of only doing well if your naturally gifted, no matter how hard you work OCR A2 chemistryfrom now on is going to be a struggle if your not already very bright. Compared with AQA, if you gave me their paper I would have aced it no problem. Not everyone is suited to the way the questions are asked, it is completely unnecessary!

Reply 2699

kingam

Original post by touran22

ok heres the paper....http://s45.photobucket.com/albums/f94/touran22/f325/

password touran22

sorry for the quality of the paper...i don't own a scanner...just an iphone 5! when your on there just hit slideshow and your good to go!

password doesnt work

Equilibria, Energetics and Elements (F325) - June 2011 Exam.

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