« previous next »
Pages: 1 ... 25 26 [27] 28 29 ... 56   Go Down

Author Topic: Chemistry Help HERE ONLY !!  (Read 106268 times)

Offline Tutu_93

  • Newbie
  • *
  • Posts: 31
  • Reputation: 13
Re: Chemistry Help HERE ONLY !!
« Reply #390 on: May 30, 2009, 10:50:06 am »
No one ?? :-[
Logged

Offline Shogun

  • SF Geek
  • ****
  • Posts: 495
  • Reputation: 25
  • Gender: Male
  • the heavens cry within the arrival of the best
Re: Chemistry Help HERE ONLY !!
« Reply #391 on: May 30, 2009, 10:56:01 am »
alright then, to get any alcohol, if u would want to convert an alkane to an alcohol all u gotto to do is take out 1 hydrogen.

see methane is CH4 do methanal would be CH3OH with 1 H missing
now tht was the molecular formula what about the structural formula

lets say methane:  H                                  so methanol would be:    H
                               l                                                                            l
                          H- C-H                                                                    H-C-H
                               l                                                                             l
                              H                                                                            OH ===>with H replaced with an OH

same with all the other alkanes. for eg ethan (C2H6) then ethanol would be C2H5) OH) with 1 H(hydrogen atom) missing, and the same with its structural formula.
in the name all u got to do is add -ol-. instead of -ane-,

for eg:the -ane- in propane is replaced by -ol- to be propanol

now the isomer, u just have to move the -OH- from the structural formula
eg: butan-1-ol :                                                  
                          H H H H                                                                      
                           l  l   l  l
                       H-C-C-C-C-OH              
                           l   l   l  l
                          H  H H H

Butan-3-ol
                          H H H H
                           l  l   l  l                                                                    
                       H-C-C-C-C-H            
                           l   l   l  l
                          H  OH H H
Now see the number on the name depends on the the number of carbon (which is 3 here)(counted from the right) u moved the OH. see u moved the OH to the 3rd Carbon(from the right). If it was moved to the 2nd carbon then it would be name butan-2-ol. just place the number between the name and the "ol". u can also count from the left but the numbers change, but be sure tp follow the rules of isomerese where u should not place the OH on the last carbon atom of the structural formula.

ther u go, hope u understand
« Last Edit: May 30, 2009, 10:59:41 am by Shogun »
Logged
one who masters both the pen and paper is indeed a true warrior.

\m/metal head\m/

Offline thukon

  • SF Citizen
  • ***
  • Posts: 250
  • Reputation: 128
  • Gender: Male
  • Blah
Re: Chemistry Help HERE ONLY !!
« Reply #392 on: May 30, 2009, 11:03:18 am »
all u have to do is take the number of carbons- for example if there are 6 carbons, then write "HEXAN"
Then, see where the OH functional group is- If its on the 2nd carbon (doesnt really matter what direction u count from, so it could be 2nd or 4th carbon) then write 2
Finally, since its and alcohol, u have to put the suffix -ol.
So we would end up with hexan-2-ol.
IF we have 2 OH groups, for example if theres and OH branching out from the 2nd and 3rd carbon, you have to write Hexan-2,3-diol.
IF the carbons have a double bond between them, then this would be an alkene, so you have to write Hexen-2-ol (the a in hexane is now an e)
Logged

Offline SGVaibhav

  • SF Farseer
  • *******
  • Posts: 3013
  • Reputation: 5737
  • Gender: Male
  • Bugatti Veyron 16.4
Re: Chemistry Help HERE ONLY !!
« Reply #393 on: May 30, 2009, 11:08:37 am »
Can anyone please solve this organic chemistry question.
Logged

Offline thukon

  • SF Citizen
  • ***
  • Posts: 250
  • Reputation: 128
  • Gender: Male
  • Blah
Re: Chemistry Help HERE ONLY !!
« Reply #394 on: May 30, 2009, 11:27:26 am »
Here u go.


AHHHH MY REP KEEPS GOING DOWN. WILL THOSE (mind ur vocab)_______ WHO DECREASE REP FOR FUN PLEASE STOP?
AND WILL THE PEOPLE WHO WOULD PROBABLY DECREASE MY REP BECAUSE I JUST SWORE PLEASE GROW UP?
« Last Edit: May 30, 2009, 11:42:50 am by sgvaibhav »
Logged

nid404

  • Guest
Re: Chemistry Help HERE ONLY !!
« Reply #395 on: May 30, 2009, 11:29:19 am »
remove a water molecule. form the peptide link

so it becomes

(-NH-(CH2)6-NHOC-(CH2)6CO-)

CONH-peptide link
« Last Edit: May 30, 2009, 11:41:13 am by nid404 »
Logged

zara

  • Guest
Re: Chemistry Help HERE ONLY !!
« Reply #396 on: May 30, 2009, 11:29:56 am »
@thukon
Thanks.... but m confused...u said dat it can be 2nd or 4th carbon....so how do v kno whch to choose n rite??
@shogun
Thanks...is it necessary dat v count frm the rite...if not then above is my doubt...

my actual doubt..

for example if we have to write the isomers of pentanol:
how will we name this one:
      OH
    !  !  !   !
H-C-C-C-C-H
    !  !  !  !
        -C-
          !
look here the OH is either on 2nd and the alkyl group(methyl) is on 3rd.....or OH is on 3rd and the alkyl grp on 2nd.......how to name this???

god i hate this soooo much!!!!



plzzzzz help!!!!
Logged

Offline SGVaibhav

  • SF Farseer
  • *******
  • Posts: 3013
  • Reputation: 5737
  • Gender: Male
  • Bugatti Veyron 16.4
Re: Chemistry Help HERE ONLY !!
« Reply #397 on: May 30, 2009, 11:33:11 am »
Quote from: thukon on May 30, 2009, 11:27:26 am
Here u go.


AHHHH MY REP KEEPS GOING DOWN. WILL THOSE (mind ur vocab)_______ WHO DECREASE REP FOR FUN PLEASE STOP?
AND WILL THE PEOPLE WHO WOULD PROBABLY DECREASE MY REP BECAUSE I JUST SWORE PLEASE GROW UP?

there is a problem with the rep system, so at times it goes low automatically.
We will try to bring it to +ve by doing +rep like how i did now.
« Last Edit: May 30, 2009, 11:42:45 am by sgvaibhav »
Logged

zara

  • Guest
Re: Chemistry Help HERE ONLY !!
« Reply #398 on: May 30, 2009, 11:37:08 am »
Quote from: thukon on May 30, 2009, 11:27:26 am
Here u go.


AHHHH MY REP KEEPS GOING DOWN. WILL THOSE BITCHES WHO DECREASE REP FOR FUN PLEASE STOP?
AND WILL THE PEOPLE WHO WOULD PROBABLY DECREASE MY REP BECAUSE I JUST SWORE PLEASE GROW UP?
+repped u!!!
for ur help!!;D
but plz dont use slang languages....n hw r u so sure dat its nly guls hu r decreasin ur reps??

neways plz clear my doubt iv posted just couple of mins ago...
Thanks..
Logged

Offline thukon

  • SF Citizen
  • ***
  • Posts: 250
  • Reputation: 128
  • Gender: Male
  • Blah
Re: Chemistry Help HERE ONLY !!
« Reply #399 on: May 30, 2009, 11:38:20 am »
Quote from: zara on May 30, 2009, 11:29:56 am
@thukon
Thanks.... but m confused...u said dat it can be 2nd or 4th carbon....so how do v kno whch to choose n rite??
@shogun
Thanks...is it necessary dat v count frm the rite...if not then above is my doubt...

my actual doubt..

for example if we have to write the isomers of pentanol:
how will we name this one:
      OH
    !  !  !   !
H-C-C-C-C-H
    !  !  !  !
        -C-
          !
look here the OH is either on 2nd and the alkyl group(methyl) is on 3rd.....or OH is on 3rd and the alkyl grp on 2nd.......how to name this???

god i hate this soooo much!!!!



plzzzzz help!!!!

It doesnt matter which one you choose, or whether u count the first carbon from the right or left, but what does matter is that u count from the same direction for all the questions concerning the hydrocarbon. For example if you count from the left, then for every question that concerns the same hydrocarbon you should count from the left. What im saying is u cant change directions.

For ur actual doubt. In the isomer, a brach with 1 carbon and 3 hydrogens is sticking out. Thats methyl.
So its 3-Methylbutan-2-ol, because the methyl branches out of the 3rd carbon (counting from the left.) The general formula for alkyls like methyl, ethyl, is Cn H2n+1
« Last Edit: May 30, 2009, 12:01:27 pm by thukon »
Logged

nid404

  • Guest
Re: Chemistry Help HERE ONLY !!
« Reply #400 on: May 30, 2009, 11:40:02 am »

thukon's right
 2-methylbutan-3-ol(or 3-methylbutan-2-ol)
Logged

Offline SGVaibhav

  • SF Farseer
  • *******
  • Posts: 3013
  • Reputation: 5737
  • Gender: Male
  • Bugatti Veyron 16.4
Re: Chemistry Help HERE ONLY !!
« Reply #401 on: May 30, 2009, 11:41:58 am »
Is this what we were supposed to right, or are we supposed to do something else only?
Logged

zara

  • Guest
Re: Chemistry Help HERE ONLY !!
« Reply #402 on: May 30, 2009, 11:43:58 am »
oh....rite...now i get it!!!
Thanks a lot!!!!!!
+rep both of u...
thukon n nid404.....
Logged

Offline SGVaibhav

  • SF Farseer
  • *******
  • Posts: 3013
  • Reputation: 5737
  • Gender: Male
  • Bugatti Veyron 16.4
Re: Chemistry Help HERE ONLY !!
« Reply #403 on: May 30, 2009, 11:44:21 am »
i think it is the same thing
lol im dumb       >:( >:( >:( >:( >:( >:( >:( >:(


but are you sure that we are supposed to do this only and there is nothing else involved?
Logged

Offline thukon

  • SF Citizen
  • ***
  • Posts: 250
  • Reputation: 128
  • Gender: Male
  • Blah
Re: Chemistry Help HERE ONLY !!
« Reply #404 on: May 30, 2009, 11:47:01 am »
Quote from: sgvaibhav on May 30, 2009, 11:41:58 am
Is this what we were supposed to right, or are we supposed to do something else only?
It gives the formula for both the hydrocarbons that are forming the nylon, so i think u have to write the whole structural formula, and not just put boxes.

@Zara.I generally use THE B WORD for both genders. That way, if its a guy, hes more insulted because im referring to him as a girl. GEt iT? ;)
Logged
Pages: 1 ... 25 26 [27] 28 29 ... 56   Go Up
« previous next »