HG_07
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Welcome to this year's forum! Any advice or tips would definitely be useful!!
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DJC1996
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Hey, I'm sitting this exam, too! You ready for it? What do you think is the hardest part of the CH4 spec ?


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HG_07
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Hey, I think I'm prepared just need to go over some small things like making sure I know the reagents for some reactions that I keep forgetting. Overall, it's quite a content heavy exam but to be specific, I'd say nitrogen chemistry is quite challenging. How about you, feeling prepared?
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DJC1996
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(Original post by HG_07)
Hey, I think I'm prepared just need to go over some small things like making sure I know the reagents for some reactions that I keep forgetting. Overall, it's quite a content heavy exam but to be specific, I'd say nitrogen chemistry is quite challenging. How about you, feeling prepared?
Yah feeling pretty prepared! Quite nervous tbh. I prefer CH5 to CH4 I think


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HG_07
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Yeah definitely very nervous, just hope it's quite a reasonable paper like recent years have been. Yeah definitely agree, going to have to gain more UMS in ch5
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DJC1996
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Yep I hope so too :/. I always thought CH4 was a lot easier simply because 80% of it is regurgitating information, but after some past papers you realise that the mark schemes so specific and you can drop marks quite easily


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HG_07
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Yeah that's definitely true although, repetition of questions is quite clear in some areas of ch4 so fingers crossed some things make a re-appreance haha!
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DJC1996
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When they ask for an equation for a particular reaction- are you allowed to write out the molecules in this format : CH3CH2CHOO for propanoic acid, or must you write it out C3H6O2 ?


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DJC1996
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COOH* ^^^^ for the carboxyl group not CHOO


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HG_07
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(Original post by DJC1996)
When they ask for an equation for a particular reaction- are you allowed to write out the molecules in this format : CH3CH2CHOO for propanoic acid, or must you write it out C3H6O2 ?


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I think from what I've seen you'd write it out as ch3ch2cooh. That's what my teacher has taught us too
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DJC1996
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Ok sweet


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HG_07
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Does anyone have all of the reagents and reactions we need to know please like in a table or something? As I keep getting confused with all of them
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DJC1996
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Not reagents and conditions, sorry :/. But here's quite a good summary of every test http://www.thestudentroom.co.uk/atta...1&d=1326148796


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HG_07
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That's great thanks, was helpful
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Madhutty
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Just to clarify... When it says 'displayed formula', what's the difference compared with when it says 'structural formula'
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Tarasinclair_97
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(Original post by Madhutty)
Just to clarify... When it says 'displayed formula', what's the difference compared with when it says 'structural formula'
Structural for example is written like e.g for ethanoic acid CH3COOH
Displayed you draw the bonds and that I think
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HG_07
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Could someone please clarify what the reagents are for producing azo dyes?


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DJC1996
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Well azo dye is a term that can be used to describe lots of different compounds. But to form the benzenediazonium salt (which can then react to form various azo dyes) you must react a mixture of sodium nitrite and hydrochloric acid (forms HNO2 nitrous acid) with phenylamine in an ice bath (below 5 degrees). This forms the aforementioned salt (benezenediazonium chloride) which can react with, for example, phenol, phenylamine, or napthalen-2-ol to form azo dyes . I think all of those are yellow but could be wrong.
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DJC1996
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When separating mixtures of liquids- when should one use steam distillation and when should one use fractional distillation?
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manjot97
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(Original post by DJC1996)
When separating mixtures of liquids- when should one use steam distillation and when should one use fractional distillation?
Can someone answer this? I think my teacher told me that you use steam distillation for amines. Anyone know the actual answer?
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