ocr a f325 revision thread

Well I'll have about 3-4 days to focus on Unit 5 and a week after to focus on Unit 4 so I'll just learn them very briefly. Same with some definitions as I'll not be able to fully learn them in the time frame I have left so it'll just be a mad dash for me really. As for the precipitation colours I'm sure there are only 4 we actually need to know, only 4 ligand substitution ones too and about 12-15 colours but you should already know about half of these from the past two years really. Best of luck with the exams and hopefully we'll be able to nail these two, that's if you go ahead to do it again

Depends? Chem 5 is my last exam so I won't be looking in depth into everything until Thursday night. Gives me a full six days to do nothing but Chemistry. I've made flash cards already and learnt my formulas as well as completing every new spec past paper, however the past papers were done with school so that was like prior to May 17th ahah.

I'd be slightly worried if you have a couple of other exams to focus on too.

Sorry which 12-15 colours are you talking about?

You've scared me now I have biology retake and geography before the Chem 5 exam and then and other geography and biol 5 before the chem 4 retake exam! Really need A's!! But you've majorly stressed me out- maybe I don't have enough time to do all the past papers??!

It could be less but there's Vanadium in the 2+, 3+, 4+ and 5+ state. We also have Chromium in the 2+, 3+ and 6+ state. There's Manganese in the 2+ and 7+ state. There's Iron in the 2+ and 3+ state. There's Copper in the 2+ state. There's Cobalt in the 2+ and 3+ state and Nickel in the 2+ state, I'm probably forgetting one somewhere and to find out the colours they're on the second page of the 3rd module in the textbook

Don't worry we aren'ty meant to know all of those colours! We are only meant to know the colour changes in precipitation reactions and ligand substitutions

Is that it? My god that's hardly anything then! I already know all the Manganese, Copper, Iron, Chromium, Cobalt and Nickel colours from the past 2 years really, so there was only Vanadium that was left to just look at the minute before I go into the exam, along with a few definitions like Standard electrode potential, etc. I'm starting to feel like I could ace anything that were to show up

Yeah i have gone through the syllabus like 6 times now and made sure what colour changes there are, i am sure we don't need to learn them!

That just makes everything so much easier and no transition metal/element question should be able to catch me out now, thanks

I really liked the chemistry questions , thank you for uploading them, will finish them all by tomorrow

It's all good as I feel the ones in the exam can't get any harder than those and they're pretty logical, I rather liked the water of crystallisation to work out x, I'm going to head up now and hopefully I'll have those questions done by Friday, maybe even Thursday afternoon. Night


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Hi, how are you preparing for this exam?
Have you done all the papers? What else are you doing....need to know how future imperial chemists work

Thanks Funtry! Yes I went over Question 8 with my Teacher, in some ways it was actually easier than the Previous years, because you only really had to create 1 Equation, and then just do Maths rather than create like 3-4 equations.

If you have any tips on those Equations I got wrong though please advise..

My Teacher said this: "the mistakes you made are only mistakes that aren't really on the syllabus, even if you had another 3 months we wouldn't cover this, a lot of it, is really just working through it like a puzzle from fundamentals"

Can you explain your type of mindset when your doing the Chem Questions? Think this is what I really must nail then in the next few days to be at a Peak and have what the Examiners reports described as a "Chemical Flair"

Just loads of reading on the stuff outside the text book, I have a couple of my cousins first year chemistry textbooks (he did biology or something, but had a few modules on chemistry). And then loads of questions!

I really don't know, I just sort of have learned the equations and then think through similar ones logically. Always look at oxidation states I guess?

About the fifth person ive said this too, but just make sure you read through the whole question, each word step by step, just in case there's a little snippet of information you would have missed out on if you just take the question at face value, by say just reading the equation etc.

Ah thats pretty good, preparing for first year chemistry at the same time as revising

Can some one link the jan 2013 paper and mark scheme?

it's not in the textbook or the spec though?