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1. (Original post by philo-jitsu)
Its the silver 1 paper question 4 part b

its binomial expansion but the second part is a bit odd

https://5a302d29ff432793ce79475dd3db...%20Edexcel.pdf
Thats confused me as well

What did you get as your expansion because i cant seem to get the same x^3 coefficient as them
2. (Original post by SeemaG18)
Thats confused me as well

What did you get as your expansion because i cant seem to get the same x^3 coefficient as them
Ive got it now,

you cant use 8-9x=7100, which rearranges to get x=-788 because we are given limits at the start that say modx<9/8

so thats why we have to take cubed root 1000 which = 10 out to get 8-9x=7.8 which rearranges to get an x that falls within the limits

might not have explained well but someone just helped me with it on another forum
3. also usually when your coefficient is wrong its a simple maths error, just double check it should be quick to find
4. (Original post by philo-jitsu)
Ive got it now,

you cant use 8-9x=7100, which rearranges to get x=-788 because we are given limits at the start that say modx<9/8

so thats why we have to take cubed root 1000 which = 10 out to get 8-9x=7.8 which rearranges to get an x that falls within the limits

might not have explained well but someone just helped me with it on another forum
Ohhh that makes so much more sense, i got the -788 but didnt get the right value when it was subbed in
5. Well, I actually managed to wake up fairly early this morning but I decided that I'd go to the library as I thought I'd get more work done there. So I travelled all the way to the library + when I got there I realised that I'd forgotten my Biology textbook. Like, I don't even know how that's possible bc you'd think it'd be the first thing I'd place in my bag but anyway, it obviously meant that I couldn't do any work which was ridiculously annoying bc I went all that way for absolutely nothing. >.>>>

Anywayyyy, I had to go out again when I got home + I just got back home again + I'm going to unpack my body then I'll start bio notes. Need to work really hard for the rest of today to make up for it.

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6. Finally done the D1 paper, got 67/75, dropped marks because I couldn't be bothered to do that great big Gantt chart at the end, otherwise would've got 71/75

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7. I finished my biology flashcards yesterday so now I'm condensing my chemistry notes. I woke up so late today though urgh

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8. Going to do the June 2011 paper now

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9. 68/75 on core 4 silver 2, made stupid error and also didn't know area of a parallelogram....

dont know if ive got another paper in me.....may watch a film then come back, done 4.5 hours so far need a break i reckon
10. Finished my second chemistry paper and I was also doing a few NMR questions from different past papers, and I can do them quite quickly now I'll practice some more NMR, then do another past paper
11. Done and marked June 2011 paper, got 65/75 which was an A so I'm ok with that.

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12. (Original post by Kamara7)
Finished my second chemistry paper and I was also doing a few NMR questions from different past papers, and I can do them quite quickly now I'll practice some more NMR, then do another past paper
tips for nmr? i never get the final structure right?! also where else can i find practise qs

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13. Gonna do Jan 2011 noe

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14. Well, I'm still making my Biology notes; almost done with topic 6 then I'll move onto succession.
15. This is the week when pretty much all my exams are happening, yet I have so little motivation to work hard. I've spent most of today rewatching got.
16. (Original post by ranz)
tips for nmr? i never get the final structure right?! also where else can i find practise qs

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Have a structured attempt at the question. I always structure the big NMR questions like this:

The singlet/doublet/whatever at 2.7ppm is caused by a H (or a number of Hs if they give you the ratio of Hs for the peaks) in a R-CH (or something else, literally copying the structure the data sheet gives) environment adjacent to however many Hs (remember the n + 1 rule), then I draw what this peak tells me. If you analyse all the peaks like this, you should get a bunch of marks
(I always say how many peaks there are in total, and then that's how many H environments there are)

So for example: the triplet at 2.9 ppm is caused by 2 Hs in a C6H5-CH environment adjacent to 2 Hs:
C6H5-CH2-CH2-

Remember to use other clues in the Q as well, if it's an ester, then there should be a peak for HC-CO- for the H next to the C=O carbon.

For piecing the molecule together, look for things that overlap. Like if you found that two peaks suggest the structures CH3-CH2- and CH3-CH2-O-, then you can guess that the CH3-CH2- overlap.

More NMR Qs: https://www.tes.com/teaching-resourc...stions-6259747
(Make a TES account).

If you have any more questions, I'll try to answer them
17. Ooooohhhhh noooooo. Done with anarchism (erm, for now... ) but the realisation that I have about 5 more ideologies (minimum) to cover is dawning upon me - why is this so hard.
Now moving on to liberalism again - think I'll have to gamble a bit and skip reading revision notes and just cover every single essay that has come up.
18. yay, I've just completed all my Bio 4 notes.

Think I'm going to take a break now, then I'll start making my Chem 4 notes bc that's on Tuesday + I think biology memorisation/preparation can wait a little.
19. Hey CONGRATS! Have you learnt any of unit 4 and 5 yet? Also may I ask what grades you're hoping for?
(Original post by Anon_98)
yay, I've just completed all my Bio 4 notes.

Think I'm going to take a break now, then I'll start making my Chem 4 notes bc that's on Tuesday + I think biology memorisation/preparation can wait a little.
20. going to write essay plans for NML and virtue ethics for philosophy exam on wednesday

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