Edexcel CHEMISTRY DOUBTS!!!!

[Malak]

but I didn't see it  in old pastpapers actually it is in the Edxecel chemistry blue book

Yeah, for some reason it is there and even I thought that we had to know it but then I checked the spec. and they only mention Ka, Kw, Pka, Pkw, pH thats it.

[guMnam]

Yeah, for some reason it is there and even I thought that we had to know it but then I checked the spec. and they only mention Ka, Kw, Pka, Pkw, pH thats it.

the point is .. its the same thing.. just opposite .. knowing it is no big deal.

[~ Miss Relina ~]

in Jan 2010 last question
why is the splitting pattern for butan1-ol is 36531

from where do we get five splitting     

[The Golden Girl =D]

It's not 36531 ... it's actually 3400 (according to my teacher that is ) which is the peak for the OH in an Alcohol

Since it can be Oxidized then it's either primary or secondary Alcohol ,tertiary can NOT be oxidized remember

Draw butanol   ,the primary , the secondary versions of it [if you are having trouble doing that let me know I'll draw it bas mikasila for now  ..u r right I'm lazy )

if you look at the spectrum for X in part (b) of the Question.  Counting them from the left to right ,they are five splittings.

Splitting one => the one with  6 lines lined up closely to each other
splitting two => the Single long line
splitting THREE => the ones with 5 lines lined up closely to each other
Splitting FOUR => those TWO parallel LONG lines
Splitting FIVE => the three lines , having the middle one the LONGEST among them

CH₃CH₂CH(OH)CH₃

starting from the LHS :

The first CH₃ => is a triplet which is the (one with three lines and the middle one the LONGEST among them   )

the CH₂ => is a Pentate [search for the ones with FIVE lines closely lined up together) ...that's the one for it

the CH => is a Sixtet [search for the ones with SIX lines closely lined up together ]

the OH => the single line ...cuz OH is ALWAYS a single line since it's a  singlet By the way

the LAST Ch₃=> is a Doublet [ search for the one with ONLY TWO lines ]



I hope I helped (:   [jawabt su2aleek ana willa kunt bas 2atfalsaf o.O ]  

(gtg go my own way  ..cya good luck with tomorrow )


Don't forget to include me in your prayers sis

[~ Miss Relina ~]

It's not 36531 ... it's actually 3400 (according to my teacher that is ) which is the peak for the OH in an Alcohol

Since it can be Oxidized then it's either primary or secondary Alcohol ,tertiary can NOT be oxidized remember

Draw butanol   ,the primary , the secondary versions of it [if you are having trouble doing that let me know I'll draw it bas mikasila for now  ..u r right I'm lazy )

if you look at the spectrum for X in part (b) of the Question.  Counting them from the left to right ,they are five splittings.

Splitting one => the one with  6 lines lined up closely to each other
splitting two => the Single long line
splitting THREE => the ones with 5 lines lined up closely to each other
Splitting FOUR => those TWO parallel LONG lines
Splitting FIVE => the three lines , having the middle one the LONGEST among them

CH₃CH₂CH(OH)CH₃

starting from the LHS :

The first CH₃ => is a triplet which is the (one with three lines and the middle one the LONGEST among them   )

the CH₂ => is a Pentate [search for the ones with FIVE lines closely lined up together) ...that's the one for it

the CH => is a Sixtet [search for the ones with SIX lines closely lined up together ]

the OH => the single line ...cuz OH is ALWAYS a single line since it's a  singlet By the way

the LAST Ch₃=> is a Doublet [ search for the one with ONLY TWO lines ]



I hope I helped (:   [jawabt su2aleek ana willa kunt bas 2atfalsaf o.O ]  

(gtg go my own way  ..cya good luck with tomorrow )


Don't forget to include me in your prayers sis

Thanks alot my sis but what confused me that if you looked at JUNE 2011 last question part (d)(ii)
I was wondering why in spectrum 2 we have septet splitting (that short one and fat too )and it ois not octet
I'll post drawing now as ana nashhhhhhhhhhheeeta geadn 

[The Golden Girl =D]

I don't usually bother to draw cuz it doesn't attach min 2asassu ..Ohh the Irony -.-

[Will EDIT  this post to answer you , waiting for ur drawing ya Miss.Nasheeta ]


(will check this thread later , gtg for now =/ )

[~ Miss Relina ~]

I don't usually bother to draw cuz it doesn't attach min 2asassu ..Ohh the Irony -.-

[Will EDIT  this post to answer you , waiting for ur drawing ya Miss.Nasheeta ]


(will check this thread later , gtg for now =/ )

here 

I'm getting worried 

[The Golden Girl =D]

here 

I'm getting worried 

La inshAllah 5eer , go make wudu and pray [alahumma 2inza3 min galbee 2il5awf wal8ala8 ] ...I made it up and it always works alhamdulilah =]

Here (hopefully attached)

[The Golden Girl =D]

the CH is the thing that represents the 7 lines one (circled in GREEN) ..it's neighbored by carbons with SIX Hydrogens !!

n + 1  =>  6 + 1  = 7  hence it's a septet and it has SEVEN lines


EDIT :No idea why it's not nine =/

[~ Miss Relina ~]

but look here

[The Golden Girl =D]

You've got a point there , You confused me as well LOL xD

I think you shouldn't be thinking about it TOO MUCH .. Because in both cases the CH has the highest numbers of lines closely lined up together ,so it doesn't make much of a difference ? =/


Can someone clear our doubts please (:  

Thanks =D

EDIT :[ The Exam is tomorrow so it's pretty much really Urgent =/ ]

[Malak]

Ok, can you tell  me what exactly is the confusion. :S

[Malak]

In Jan 2010, The single H (which is joined to the carbon with OH) is next to 5 hydrogens and so it form a mulitplet.
In june 2011, there is a single H (joined to the carbon with methyl group) and it is also next to 5 hydrogens but forms 7 peaks.

Is that your question?

First of all, my teacher always told us that when ever there are a lot of peak like these two above, it is due to the hydrogen(s) which are next to many hydrogens.
I think, in june 2011 it has 7 peaks because, don't forget, even though they hydrogens of methly group are not directly next to the single hydrogen but they do affect it and probably thats why it has 7 peaks.
In jan 2010, there is only a single H of OH which is not directly next to the 'single' hydrogen we are talking about and so it doesnt really have an impact.
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By the way, do we have to know the mechanism between propane and iodine (the very complicated one) 

[jackfos92]

What is the colour of [CrCl4]- ? tetrachlorochromium 3.

it is complex ion. i needa know the colour!!! urgent!

[The Golden Girl =D]

^ I believe it is  violet solution ..according to my chemistry knowledge *poker face*

Ladies and gentlemen can someone clear my doubt , got a test tomorrow -.-

Can someone state what a ligand exchange is and what an acid-base reaction is , what is the difference between them because I'm confused =/


Thanks (: