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Abby can you OR ANYONE plss explain the question to me???? The answer is also attached
plsss View attachment 41708
ANSWER View attachment 41708View attachment 41709
2 Questions. Firstly, in p4 (A2), do we have to memorize the
of complexes of all transition metals? Apart from Co and Fe ones ofcourse.
Secondly, what about when we add KMno4 to Fe2+ solution? TEchnically, shouldn't the solution turn from green to brown? Mark scheme says that the solution turns colourless and then finally on excess of MnO4- it turns pink. How?
can anyone explain if cyclohexane reacts with NaOH or not?? so confused...
can teach me steps to sketch graph for acid-base neutralisation? for eg: 25 cm^3 of 0.200moldm^-3 NaOH is titrated against 0.100 moldm^-3 ethanoic acid solution. Tq
NaOH doesnt react with cyclohexane nor cyclohexene it reacts with phenols forming sodium phenoxidecan anyone explain if cyclohexane reacts with NaOH or not?? so confused...
thanks man, thanks alotHave you read the chapter on partition coefficients? This page does a great job in explaining the concept and how to do the calculations. http://www.chemguide.co.uk/CIE/section112/learningf.html
Read that page and try to figure out how to solve the question yourself. It's mostly math anyway.
No need to memorize colours of complexes, other than Cu2+ complexes, and iron (ii)/(iii) ones. Make sure you know the reason behind the colours as that is a very common question.
As for your second question, it's rather subjective. The colour of the Fe2+ solution really depends on the concentration of the ions. If it's dilute, the colour would be harder to notice than the very prominent purple of the KMnO4 solution. This is what I think to make the most sense. I have no idea what the examiner had in mind lol.
I found that confusing too, but I don't think its important, because they gave marks without the mention of that point too, anyways, hoping that someone will answer it here,http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w13_qp_41.pdf 5d(i)
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w13_ms_41.pdf is the answer correct , i mean is the water molecule sttracted towards Na in this way???
Great step, but I'd advice that you do them with pen, ofcourse these have been done, but the later ones, if you ever add them, try doing them with pen because the contrast is quite low so its pretty difficult to read. Anyways, its really cool!Hi everyone
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Great step, but I'd advice that you do them with pen, ofcourse these have been done, but the later ones, if you ever add them, try doing them with pen because the contrast is quite low so its pretty difficult to read. Anyways, its really cool!
When are u gonna do the same for A2 papers!it would be awesome if u take the same initiative for A2 soon,cuz we have papers next week!As students gonna get a great help from your work!Thank you! Yeah I'll try and do that. Problem is that I scratch out a LOT while writing so that would be quite an eyesore. I'll make sure that I adjust the contrast and see if it's readable for the next papers. Thank you so much for the feedback, I appreciate it
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