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Need help with amine questions - rep will be rewarded
I did my chemistry unit 4 exam (yesterday) as an external candidate because my school is crap and havn't even finished unit 4 yet! Therefore I did it all myself, the lessons were just revision for me.
Any how, I've still got stupid hwk to hand in (because my school don't know I entered as a private candidate at another centre), its one of those annoyingly 'different' questions which don't even come up in the exam.
Complete all of it and you get a rep, please dont complete bits of it as I cant be bothered to give multiple reps (different days of course)
The ones you cant do just guess (make it look good),I dont really care that much as I have already done the exam
1) Why is the fishy smell of methylamine intensified when added to sodium hydroxide? Include an equation
2) Give the equation for phenylamine + HCl (In the exam they wouldnt ask phenylamines) Then give the equation of the that product + NaOH
3) Why is ethylamine a stronger or weaker base than ammonia
4) Why is phenylamine a stronger or weaker base than ammonia
thankyou!
Any how, I've still got stupid hwk to hand in (because my school don't know I entered as a private candidate at another centre), its one of those annoyingly 'different' questions which don't even come up in the exam.
Complete all of it and you get a rep, please dont complete bits of it as I cant be bothered to give multiple reps (different days of course)
The ones you cant do just guess (make it look good),I dont really care that much as I have already done the exam
1) Why is the fishy smell of methylamine intensified when added to sodium hydroxide? Include an equation
2) Give the equation for phenylamine + HCl (In the exam they wouldnt ask phenylamines) Then give the equation of the that product + NaOH
3) Why is ethylamine a stronger or weaker base than ammonia
4) Why is phenylamine a stronger or weaker base than ammonia
thankyou!
Reply 1
any time today will do......
Reply 2
gordon2002
3) Why is ethylamine a stronger or weaker base than ammonia
4) Why is phenylamine a stronger or weaker base than ammonia
4) Why is phenylamine a stronger or weaker base than ammonia
3) ethylamine is stronger base than ammonia
4) phenylamine is weaker base than ammonia.
Reply 3
Dekota
3) ethylamine is stronger base than ammonia
4) phenylamine is weaker base than ammonia.
4) phenylamine is weaker base than ammonia.
yes..... they're are very good reasons
Reply 4
lol and the answers are ............ beyond me lol sorry dude
Reply 5
[QUOTE='.:[LoserBoy]:.']lol and the answers are ............ beyond me lol sorry dude
k no worries
k no worries
Reply 6
The very small amines like methylamine smell very similar to ammonia
As the amines get bigger, they tend to smell more "fishy", or they smell of decay.- hope that helps with question 1 umm dont know equation though
As the amines get bigger, they tend to smell more "fishy", or they smell of decay.- hope that helps with question 1 umm dont know equation though
Reply 7
iceman_jondoe
The very small amines like methylamine smell very similar to ammonia
As the amines get bigger, they tend to smell more "fishy", or they smell of decay.- hope that helps with question 1 umm dont know equation though
As the amines get bigger, they tend to smell more "fishy", or they smell of decay.- hope that helps with question 1 umm dont know equation though
cheers, but it says when adding NaOH, are you therefore saying adding NaOH makes the amine smaller?
Reply 8
no im saying addition of naoh makes the amine bigger
Reply 10
yeah, that's worthy enough to get a rep
Edit: It'll have to be at 11pm because I've run out
Firstly, chemguide is godlike. I use it more than my own notes!
1) Why is the fishy smell of methylamine intensified when added to sodium hydroxide? Include an equation
Have no idea, perhaps something to do with hydrolysis?
2) Give the equation for phenylamine + HCl (In the exam they wouldnt ask phenylamines) Then give the equation of the that product + NaOH
C6H4NH2 + HCl -> C6H5NH3Cl (+ NaOH) -> C6H5NH2 + NaCl + H2O
3) Why is ethylamine a stronger or weaker base than ammonia
It is stronger, as the R group attached to the Nitrogen donate electron density, whereas Hydrogen doesn't, so ethylamine has a larger delta- charge on the Nitrogen, so it's more likely to accept a proton, so it's a stronger base.
4) Why is phenylamine a stronger or weaker base than ammonia
It's weaker, as the phenyl group will reduce the size of the delta- charge on the Nitrogen, as the lone pair then becomes shared over the crazy pi bonding system in the benzene ring, so it is less likely to accept a proton than ammona, so it's a weaker base.
1) Why is the fishy smell of methylamine intensified when added to sodium hydroxide? Include an equation
Have no idea, perhaps something to do with hydrolysis?
2) Give the equation for phenylamine + HCl (In the exam they wouldnt ask phenylamines) Then give the equation of the that product + NaOH
C6H4NH2 + HCl -> C6H5NH3Cl (+ NaOH) -> C6H5NH2 + NaCl + H2O
3) Why is ethylamine a stronger or weaker base than ammonia
It is stronger, as the R group attached to the Nitrogen donate electron density, whereas Hydrogen doesn't, so ethylamine has a larger delta- charge on the Nitrogen, so it's more likely to accept a proton, so it's a stronger base.
4) Why is phenylamine a stronger or weaker base than ammonia
It's weaker, as the phenyl group will reduce the size of the delta- charge on the Nitrogen, as the lone pair then becomes shared over the crazy pi bonding system in the benzene ring, so it is less likely to accept a proton than ammona, so it's a weaker base.
Reply 12
thanks parag, but I've only just read this, so its too late...
Reply 13
I think your teacher is going to be a bit peaved when they find out you've already done the exam!
Reply 14
stratomaster
I think your teacher is going to be a bit peaved when they find out you've already done the exam!
lol, I know.
It's their fault for being crap teachers, well not crap, but slow
Reply 15
amines exist in equilibrium with the salt of the amine in aqueous solution or the presence of water
RNH2 + H2O <==> RNH3+ + OH-
Only the amine RNH2 is volatile and therefoere smelly. Addition of OH- ions using NaOH pushes the equilibrium towards the left hand side, making more of the RNH2 and so it gets smellier.
RNH2 + H2O <==> RNH3+ + OH-
Only the amine RNH2 is volatile and therefoere smelly. Addition of OH- ions using NaOH pushes the equilibrium towards the left hand side, making more of the RNH2 and so it gets smellier.
Reply 16
charco
amines exist in equilibrium with the salt of the amine in aqueous solution or the presence of water
RNH2 + H2O <==> RNH3+ + OH-
Only the amine RNH2 is volatile and therefoere smelly. Addition of OH- ions using NaOH pushes the equilibrium towards the left hand side, making more of the RNH2 and so it gets smellier.
RNH2 + H2O <==> RNH3+ + OH-
Only the amine RNH2 is volatile and therefoere smelly. Addition of OH- ions using NaOH pushes the equilibrium towards the left hand side, making more of the RNH2 and so it gets smellier.
yeah that's what I wrote down
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