« previous next »
Pages: [1]   Go Down

Author Topic: Chemistry  (Read 1921 times)

Offline Numb

  • Newbie
  • *
  • Posts: 34
  • Reputation: 99
Chemistry
« on: April 07, 2010, 11:25:40 am »
Draw a possible structre of dibromobutane.

the mark scheme says any correct formula for a dibromo methane??????
Logged

Offline Saladin

  • The Samurai
  • Honorary Member
  • SF V.I.P
  • *****
  • Posts: 6530
  • Reputation: 59719
  • Gender: Male
  • I believe in those who believe in me
    • Student Tech
Re: Chemistry
« Reply #1 on: April 07, 2010, 12:21:24 pm »
here u go
Logged

Offline haris94

  • SF Senior Citizen
  • *****
  • Posts: 930
  • Reputation: 984
  • Gender: Male
Re: Chemistry
« Reply #2 on: April 07, 2010, 02:04:42 pm »
2 POSSIBLE SOLUTIONS
1) u read it wrong
2) typing error in the mark scheme

if its dibromo methane, numb is correct
if its dibromo butane,
its C4H8Br2 (molecular formula)
Logged
WHAT WE DO IN LIFE ECHOES AN ETERNITY

Offline Saladin

  • The Samurai
  • Honorary Member
  • SF V.I.P
  • *****
  • Posts: 6530
  • Reputation: 59719
  • Gender: Male
  • I believe in those who believe in me
    • Student Tech
Re: Chemistry
« Reply #3 on: April 07, 2010, 03:37:44 pm »
Quote from: haris94 on April 07, 2010, 02:04:42 pm
2 POSSIBLE SOLUTIONS
1) u read it wrong
2) typing error in the mark scheme

if its dibromo methane, numb is correct
if its dibromo butane,
its C4H8Br2 (molecular formula)

Sorry abt that, my head was messed up. LOL

Anyways the answer is attatched.

Its just that, the 2 in the di-bromo can be acheived from both ends. One is just the other turned 180o
Logged

Offline haris94

  • SF Senior Citizen
  • *****
  • Posts: 930
  • Reputation: 984
  • Gender: Male
Re: Chemistry
« Reply #4 on: April 07, 2010, 04:11:45 pm »
@ the ultimate dude :
u r right bout the answer but i think what numb is trying to say is that the question asks for dibromo butane while the mark scheme says "any correct formula for dibromo methane"
either that or numb typed it wrong over here
 
Logged
WHAT WE DO IN LIFE ECHOES AN ETERNITY

Offline Saladin

  • The Samurai
  • Honorary Member
  • SF V.I.P
  • *****
  • Posts: 6530
  • Reputation: 59719
  • Gender: Male
  • I believe in those who believe in me
    • Student Tech
Re: Chemistry
« Reply #5 on: April 07, 2010, 04:21:25 pm »
Quote from: haris94 on April 07, 2010, 04:11:45 pm
@ the ultimate dude :
u r right bout the answer but i think what numb is trying to say is that the question asks for dibromo butane while the mark scheme says "any correct formula for dibromo methane"
either that or numb typed it wrong over here
 

LOL, then that is wrong. Because why would they want that. Anyways, the correct markscheme statement would be 'any structure of dibromobutane', which basically means that, any of the two. This is funny, because u will get some questions like these at a level as well, when it comes to reactions and breaking double bonds.
Logged

holtadit

  • Guest
Re: Chemistry
« Reply #6 on: April 07, 2010, 04:57:27 pm »
@Dude


shouldnt it be :

Logged

nid404

  • Guest
Re: Chemistry
« Reply #7 on: April 07, 2010, 05:48:36 pm »
yes ari ur right...
Bromine attached to the carbons across the double bonds....so they'll always be on two different carbon atoms...

@dude-name in black?!?!?! :o
Logged

holtadit

  • Guest
Re: Chemistry
« Reply #8 on: April 07, 2010, 05:55:13 pm »
Quote from: nid404 on April 07, 2010, 05:48:36 pm
@dude-name in black?!?!?! :o

did he get banned ?
Logged

nid404

  • Guest
Re: Chemistry
« Reply #9 on: April 07, 2010, 05:56:56 pm »
Quote from: Ari Ben Canaan on April 07, 2010, 05:55:13 pm
did he get banned ?

He banned himself apparently :-\
Logged

Offline Numb

  • Newbie
  • *
  • Posts: 34
  • Reputation: 99
Re: Chemistry
« Reply #10 on: April 07, 2010, 06:16:27 pm »
That's what i got

mark scheme says otherwise. :S
Logged

nid404

  • Guest
Re: Chemistry
« Reply #11 on: April 07, 2010, 06:28:40 pm »
Quote from: Numb on April 07, 2010, 06:16:27 pm
That's what i got

mark scheme says otherwise. :S

I'd like to c the qp and ms...
plz upload it here
Thanks
Logged

holtadit

  • Guest
Re: Chemistry
« Reply #12 on: April 07, 2010, 06:32:43 pm »
Quote from: nid404 on April 07, 2010, 06:28:40 pm
I'd like to c the qp and ms...
plz upload it here
Thanks

I remeber seeing this question before. I ve done the past papers so many times.

I think they ask only for the molecular formula and not the structural...
Logged

Offline haris94

  • SF Senior Citizen
  • *****
  • Posts: 930
  • Reputation: 984
  • Gender: Male
Re: Chemistry
« Reply #13 on: April 07, 2010, 06:39:23 pm »
Quote from: Numb on April 07, 2010, 06:16:27 pm
That's what i got

mark scheme says otherwise. :S

there could be a typing error or something in the ms
its happened with me b4
Logged
WHAT WE DO IN LIFE ECHOES AN ETERNITY

Offline MaNi_DaDuDe

  • Don't use profanity, it makes you seem uneducated.
  • SF Farseer
  • *******
  • Posts: 3383
  • Reputation: 65510
  • Gender: Male
  • uh, ef you?
    • Team siCk
Re: Chemistry
« Reply #14 on: April 07, 2010, 07:22:05 pm »
Quote from: nid404 on April 07, 2010, 05:56:56 pm
He banned himself apparently :-\

yes for 59 days. :(
Logged
Pages: [1]   Go Up
« previous next »