[Bright]

(Original post by SpringNicht)
It's not for a few weeks yet, just throw yourself in now and it should all work out

Hopefully, I have F324 and other exams as well.. gosh stressful times.

[SpringNicht]

(Original post by gukl)
Wow, you have almost the same ums as me in each exam! I too need to blitz f325 and f324, going to be shaking like a leaf when it comes to it!

Clearly it's because we're both super cool and OCR is jealous so they decided to hate on our F324

It'll be OK! The exam gods will take pity on us and give us an amazing paper that only the people on TSR can answer, therefore giving us low grade boundaries but high raw scores...this is the way it goes in my dreams anyway

(Original post by Bright)
Hopefully, I have F324 and other exams as well.. gosh stressful times.

How many exams do you have? 6 total over here, 1 down 5 to go

[Bright]

(Original post by SpringNicht)
Clearly it's because we're both super cool and OCR is jealous so they decided to hate on our F324

It'll be OK! The exam gods will take pity on us and give us an amazing paper that only the people on TSR can answer, therefore giving us low grade boundaries but high raw scores...this is the way it goes in my dreams anyway



How many exams do you have? 6 total over here, 1 down 5 to go

Excluding critical thinking 5, 1 down 4 to go. (very unprepared though!)

[SpringNicht]

(Original post by Bright)
Excluding critical thinking 5, 1 down 4 to go. (very unprepared though!)

You're probably more prepared than you think

[Bright]

(Original post by SpringNicht)
You're probably more prepared than you think

Haha I wish!
I thought I was prepared for this paper in Jan came out with a D (but I didn't do past paper practice)

[ViralRiver]

Good luck to all taking the exam. I made some flashcards when I took my A levels on all the definitions you have to know and some notes. Unfortunately, I can't remember which definitions go with what exam, but I've linked to them both below, hopefully by now you know what the content of your exam is :P .

F325 Definitions - http://flashcarddb.com/cardset/13611...ons-flashcards
F325 Definitions (2) - http://flashcarddb.com/cardset/12313...ons-flashcards
F325 Notes - http://flashcarddb.com/cardset/12324...tes-flashcards
Organic Chemistry - http://flashcarddb.com/cardset/11265...ons-flashcards
Arenes + Phenols - http://flashcarddb.com/cardset/10665...ols-flashcards
Definitions - http://flashcarddb.com/cardset/91917...ons-flashcards
Definitions 2 - http://flashcarddb.com/cardset/81591...ons-flashcards
Notes - http://flashcarddb.com/cardset/91900...try-flashcards
Notes 2 - http://flashcarddb.com/cardset/81714...uff-flashcards
Electromagnetic Wavelengths - http://flashcarddb.com/cardset/81497...ths-flashcards

As you can see, I didn't name them very well when I made them - so most of these won't be applicable to this exam, so if the flash cards don't make sense to you - it's probably one of the other modules.

But, each flash card is solely based on one module, I haven't mixed different modules into the flashcards.

[Raj K]

(Original post by viralriver)
good luck to all taking the exam. I made some flashcards when i took my a levels on all the definitions you have to know and some notes. Unfortunately, i can't remember which definitions go with what exam, but i've linked to them both below, hopefully by now you know what the content of your exam is .

F325 definitions - http://flashcarddb.com/cardset/13611...ons-flashcards
f325 definitions (2) - http://flashcarddb.com/cardset/12313...ons-flashcards
f325 notes - http://flashcarddb.com/cardset/12324...tes-flashcards
organic chemistry - http://flashcarddb.com/cardset/11265...ons-flashcards
arenes + phenols - http://flashcarddb.com/cardset/10665...ols-flashcards
definitions - http://flashcarddb.com/cardset/91917...ons-flashcards
definitions 2 - http://flashcarddb.com/cardset/81591...ons-flashcards
notes - http://flashcarddb.com/cardset/91900...try-flashcards
notes 2 - http://flashcarddb.com/cardset/81714...uff-flashcards
electromagnetic wavelengths - http://flashcarddb.com/cardset/81497...ths-flashcards

as you can see, i didn't name them very well when i made them - so most of these won't be applicable to this exam, so if the flash cards don't make sense to you - it's probably one of the other modules.

But, each flash card is solely based on one module, i haven't mixed different modules into the flashcards.

legend. Thankyou.

[Bright]

I don't understand how to form equations for rate determining step.

I know that what appears in the rate equation is found in the rate determining step and then another reaction follows before reaching the overall equation but I don't know how to form the other equations.

can anyone explain, (if you understood what I just said you are a genius)

[LifeIsGood]

(Original post by Bright)
I don't understand how to form equations for rate determining step.

I know that what appears in the rate equation is found in the rate determining step and then another reaction follows before reaching the overall equation but I don't know how to form the other equations.

can anyone explain, (if you understood what I just said you are a genius)

I'll give it a shot, Let's take the January 2012 example:
H2(g) + 2ICl(g) 2HCl(g) + I2(g)
rate = k[H2(g)] [ICl(g)]

Ok so you got the balanced equation and the rate equation. You can see that's there's only 1 moles of the reactants in the rate determining step (1st step)

1st: H2 + ICL --> __ + __
2nd: __+ ICL -- __ + __

That's the first thing you should do because you see there's only 1 ICl in the rate determining step and to get to the balanced, you need another one. You add it in vertically.

Next thing we need to do is form HCl and there's a big clue that HCl is included in the rate determining step because there's TWO moles in the balanced equation so now it looks like this:

1st: H2 + ICL --> __ + HCl
2nd: __+ ICL --> __ + HCl

We're almost there now, look at the rate determining step - it must be logical so let's dissect it:

H2 + ICL --> HCl + X
The way I do it is: H + Cl --> HCl, what is remaining ---> HI so this is your intermediate and it makes since I2 is formed in the overall equation so now:

1st: H2 + ICL --> HI + HCl
2nd: HI + ICL --> __ + HCl

And you can just double check: H + CL --> HCL leaving you with the two remaining I --> I2

1st: H2 + ICL --> HI + HCl
2nd: HI + ICL --> I2 + HCl

Hope that helps!

[Bright]

(Original post by LifeIsGood)
I'll give it a shot, Let's take the January 2012 example:
H2(g) + 2ICl(g) 2HCl(g) + I2(g)
rate = k[H2(g)] [ICl(g)]

Ok so you got the balanced equation and the rate equation. You can see that's there's only 1 moles of the reactants in the rate determining step (1st step)

1st: H2 + ICL --> __ + __
2nd: __+ ICL -- __ + __

That's the first thing you should do because you see there's only 1 ICl in the rate determining step and to get to the balanced, you need another one. You add it in vertically.

Next thing we need to do is form HCl and there's a big clue that HCl is included in the rate determining step because there's TWO moles in the balanced equation so now it looks like this:

1st: H2 + ICL --> __ + HCl
2nd: __+ ICL --> __ + HCl

We're almost there now, look at the rate determining step - it must be logical so let's dissect it:

H2 + ICL --> HCl + X
The way I do it is: H + Cl --> HCl, what is remaining ---> HI so this is your intermediate and it makes since I2 is formed in the overall equation so now:

1st: H2 + ICL --> HI + HCl
2nd: HI + ICL --> __ + HCl

And you can just double check: H + CL --> HCL leaving you with the two remaining I --> I2

1st: H2 + ICL --> HI + HCl
2nd: HI + ICL --> I2 + HCl

Hope that helps!

Aww thanks it does make sense and you explained it really well

I just need to get my head around it now and do practice!
Good luck with the exam! :]

[LifeIsGood]

(Original post by Bright)
Aww thanks it does make sense and you explained it really well

I just need to get my head around it now and do practice!
Good luck with the exam! :]

No problem, it's just practice

The OCR book doesn't explain it well at all, I kind of figured it out from doing the examples in philips alan updates book.

[mathsclown]

Just started revision for this, 2 weeks to brush up, not too difficult and luckily have plenty of practise material, so hopefully next week this time, would have practised everything, then spend the last week before the exam doing past papers!

Annoying how the weather is so nice now, but have to stay in doing F325 -.-

[LifeIsGood]

(Original post by mathsclown)
Just started revision for this, 2 weeks to brush up, not too difficult and luckily have plenty of practise material, so hopefully next week this time, would have practised everything, then spend the last week before the exam doing past papers!

Annoying how the weather is so nice now, but have to stay in doing F325 -.-

Same but the practice papers aren't really as much application as we will get which is a little worrying

[mathsclown]

(Original post by LifeIsGood)
Same but the practice papers aren't really as much application as we will get which is a little worrying

True, but I think chemistry is sort of like maths, it's a bit more lenient in respect to the application part, but I do agree it is harder than the practise material, but hey as long as we prepare well, nothing to worry about

[LifeIsGood]

(Original post by mathsclown)
True, but I think chemistry is sort of like maths, it's a bit more lenient in respect to the application part, but I do agree it is harder than the practise material, but hey as long as we prepare well, nothing to worry about

Legacy papers are quite challenging, June 2005 of Unifying Concepts....

[mathsclown]

(Original post by LifeIsGood)
Legacy papers are quite challenging, June 2005 of Unifying Concepts....

Will have a look at that thanks ! Going to start the revision in evening, hopefully get it all done by sunday morning, then just practise practise practise! January the grade boundaries were quite high, 77 for an A, hoping for a lenient paper

[like_a_star]

does anyone have the old papers from the old specification or know a link to a website where I can get them from? I usually use feeexampapers.com but its not working anymore :s

Thanks

[Killjoy-]

(Original post by like_a_star)
does anyone have the old papers from the old specification or know a link to a website where I can get them from? I usually use feeexampapers.com but its not working anymore :s

Thanks

I usually use this site for maths past papers, but there's no reason they shouldn't have chem ones:

http://www.xtremepapers.com/

[Klaw]

Is it impossible to get 140/150 UMS?

[Cath-ay]

(Original post by like_a_star)
does anyone have the old papers from the old specification or know a link to a website where I can get them from? I usually use feeexampapers.com but its not working anymore :s

Thanks

This post: http://www.thestudentroom.co.uk/show...6#post37518486