« previous next »
Pages: 1 ... 94 95 [96] 97 98 ... 116   Go Down

Author Topic: Edexcel CHEMISTRY DOUBTS!!!!  (Read 268114 times)

Amelia

  • Guest
Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1425 on: September 27, 2011, 05:13:35 pm »
Quote from: ~Relina~ on September 24, 2011, 06:18:48 pm
the book says what's the realtionship between the neutralisation and redox ??? any websites I would be grateful  :D


How can they be related? Two completely different reactions.  :-\

Redox reactions are oxidation (lose of electrons) and reduction (gain of electrons) reaction.

Neutralization reaction is the combination of acid (H+ ions) and base (OH- ions) to give a salt, with no electron transfer whatsoever.

So, yeah. Something's up with the question.  ::) :P
Logged

Offline The Golden Girl =D

  • Without Allah I'm nothing <3
  • Honorary Member
  • SF Overlord
  • *****
  • Posts: 13757
  • Reputation: 65532
  • Ain't Nothin worth your tears =D
    • www.thegoldengirl157.blogspot.com
Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1426 on: September 27, 2011, 07:00:52 pm »
Which chapter is that girls ::)
Logged
Verily, in the remembrance of Allah do hearts find rest(13:28)

Please, Don't forget to Include GG in your Prayers =D

Offline ~ Miss Relina ~

  • SF Senior Citizen
  • *****
  • Posts: 611
  • Reputation: 65535
  • Gender: Female
  • Every rose has a thorn
Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1427 on: September 27, 2011, 08:08:17 pm »
well @ Angel : its on page 75 the SC sign
@Amelia I think there is a relation but I don't know exactly
@Golden girl : acid-base equilibria
Logged
~~~Yarab everything turns alright at the end ~~~
    -----------Ameeeeeeeeeeen------------

Offline The Golden Girl =D

  • Without Allah I'm nothing <3
  • Honorary Member
  • SF Overlord
  • *****
  • Posts: 13757
  • Reputation: 65532
  • Ain't Nothin worth your tears =D
    • www.thegoldengirl157.blogspot.com
Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1428 on: September 28, 2011, 12:59:06 pm »
I can't you since We haven't started it at school =[
Logged
Verily, in the remembrance of Allah do hearts find rest(13:28)

Please, Don't forget to Include GG in your Prayers =D

Offline ~ Miss Relina ~

  • SF Senior Citizen
  • *****
  • Posts: 611
  • Reputation: 65535
  • Gender: Female
  • Every rose has a thorn
Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1429 on: September 28, 2011, 01:08:52 pm »
Quote from: ~The Golden Girl~ on September 28, 2011, 12:59:06 pm
I can't you since We haven't started it at school =[
 
 anyways Thanks alot for ur respond
Logged
~~~Yarab everything turns alright at the end ~~~
    -----------Ameeeeeeeeeeen------------

Offline ~ Miss Relina ~

  • SF Senior Citizen
  • *****
  • Posts: 611
  • Reputation: 65535
  • Gender: Female
  • Every rose has a thorn
Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1430 on: September 28, 2011, 02:31:58 pm »
well guys i need that question to be killed as it's driving me mad and I don't what's up  with me  :o :o :o
Q4(aii) how do I know the initial moles  exactly ???
http://www.xtremepapers.com/Edexcel/Advanced%20Level/Chemistry/2002%20Jan/Question%20Paper%20Jan%202002%20Unit-4.pdf

« Last Edit: September 28, 2011, 07:47:33 pm by ~Relina~ »
Logged
~~~Yarab everything turns alright at the end ~~~
    -----------Ameeeeeeeeeeen------------

Offline Malak

  • Honorary Member
  • SF Farseer
  • *****
  • Posts: 4454
  • Reputation: 65534
  • A warm smile is the universal language of kindness
Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1431 on: September 28, 2011, 06:38:47 pm »
Quote from: ~Relina~ on September 28, 2011, 02:31:58 pm
well guys i need that question to be killed as it's driving me mad and I don't what's up  with me  :o :o :o
Q5(aii) how do I know the initial moles  exactly ???
http://www.xtremepapers.com/Edexcel/Advanced%20Level/Chemistry/2002%20Jan/Question%20Paper%20Jan%202002%20Unit-4.pdf


Are you sure its the right Question :S
Q5 a ii asks for a reagent  :-\ not moles.
Logged
If you are a man who degrades women then allow me to respectfully remind you that you came from ONE

Reminder to myself: Stop worrying and start working

SF magazine 2012 - Download here

Offline ~ Miss Relina ~

  • SF Senior Citizen
  • *****
  • Posts: 611
  • Reputation: 65535
  • Gender: Female
  • Every rose has a thorn
Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1432 on: September 28, 2011, 06:41:44 pm »
Quote from: Ang3l on September 28, 2011, 06:38:47 pm
Are you sure its the right Question :S
Q5 a ii asks for a reagent  :-\ not moles.
sorry
EDIT : Q4 a(ii) 
Logged
~~~Yarab everything turns alright at the end ~~~
    -----------Ameeeeeeeeeeen------------

Offline ~ Miss Relina ~

  • SF Senior Citizen
  • *****
  • Posts: 611
  • Reputation: 65535
  • Gender: Female
  • Every rose has a thorn
Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1433 on: September 30, 2011, 11:48:53 pm »
so plz guys help is urgent here asap  :-[
Logged
~~~Yarab everything turns alright at the end ~~~
    -----------Ameeeeeeeeeeen------------

Offline Romeesa-Chan

  • Chère
  • Global Moderator
  • SF Overlord
  • *****
  • Posts: 10821
  • Reputation: 65535
  • Gender: Female
  • "Be the person you want to meet."
Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1434 on: October 01, 2011, 12:09:26 am »
Quote from: ~Relina~ on September 30, 2011, 11:48:53 pm
so plz guys help is urgent here asap  :-[
I am sorry but I have no idea ... >_<

Hope GG or Ang3l can help you out ... :-[
Logged
Download SF Magazine 2012 here.

Offline The Golden Girl =D

  • Without Allah I'm nothing <3
  • Honorary Member
  • SF Overlord
  • *****
  • Posts: 13757
  • Reputation: 65532
  • Ain't Nothin worth your tears =D
    • www.thegoldengirl157.blogspot.com
Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1435 on: October 01, 2011, 07:52:50 am »
I cam across the same Question and I wasn't able to answer.sorry =[
Logged
Verily, in the remembrance of Allah do hearts find rest(13:28)

Please, Don't forget to Include GG in your Prayers =D

Offline ~ Miss Relina ~

  • SF Senior Citizen
  • *****
  • Posts: 611
  • Reputation: 65535
  • Gender: Female
  • Every rose has a thorn
Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1436 on: October 01, 2011, 08:31:22 am »
okay guys Thanks alot for ur respond I've got it from other place
thx for trying to help  ;) :) :D ;D really appreaciated
I'm not the who one  makes her students upset  ;D ;D ;D ;D

Logged
~~~Yarab everything turns alright at the end ~~~
    -----------Ameeeeeeeeeeen------------

Offline Banana

  • Global Moderator
  • SF Master
  • *****
  • Posts: 2232
  • Reputation: 65535
  • Gender: Male
  • The Dancin' Banana
Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1437 on: October 01, 2011, 08:52:31 am »
Quote from: ~Relina~ on October 01, 2011, 08:31:22 am
okay guys Thanks alot for ur respond I've got it from other place
thx for trying to help  ;) :) :D ;D really appreaciated
I'm not the who one  makes her students upset  ;D ;D ;D ;D



Can you tell us the answer?  :-\
Logged
Save Mars...it's the only habitable planet that doesn't have schools ;D

Amelia

  • Guest
Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1438 on: October 01, 2011, 08:57:42 am »
Quote from: ~Relina~ on September 28, 2011, 06:41:44 pm
sorry
EDIT : Q4 a(ii) 

I'm glad you managed to find the answer, Relina, but for the sake of other's benefit I'll clear it out.  ;)

2SO3(g) <----> 2SO2(g)+ O2(g)

Moles at the start of the experiment: 2 (for SO3) 0 (for SO2) 0 (for O2)

Moles at equilibrium: 1.5 (for SO2 ---> "75% of SO3", so you have to do 75% of the initial 2moles of SO3), O.5 (for SO3, because 75% has been disassociated; subtract the moles of initial moles of SO3 with the equilibrium moles of SO2) and 0.5 moles of 02 (you did notice in the equation there's only one mole of O2, so it's half of SO2 in the equilibrium.)

and than you have to find out the partial pressure, I guess y'all know how to do that.

P.S - Sorry for the late reply.


Logged

Offline Banana

  • Global Moderator
  • SF Master
  • *****
  • Posts: 2232
  • Reputation: 65535
  • Gender: Male
  • The Dancin' Banana
Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1439 on: October 01, 2011, 09:27:23 am »
Quote from: Amelia on October 01, 2011, 08:57:42 am
I'm glad you managed to find the answer, Relina, but for the sake of other's benefit I'll clear it out.  ;)

2SO3(g) <----> 2SO2(g)+ O2(g)

Moles at the start of the experiment: 2 (for SO3) 0 (for SO2) 0 (for O2)

Moles at equilibrium: 1.5 (for SO2 ---> "75% of SO3", so you have to do 75% of the initial 2moles of SO3), O.5 (for SO3, because 75% has been disassociated; subtract the moles of initial moles of SO3 with the equilibrium moles of SO2) and 0.5 moles of 02 (you did notice in the equation there's only one mole of O2, so it's half of SO2 in the equilibrium.)

and than you have to find out the partial pressure, I guess y'all know how to do that.

P.S - Sorry for the late reply.




Thanks fer the help  ;)
Logged
Save Mars...it's the only habitable planet that doesn't have schools ;D
Pages: 1 ... 94 95 [96] 97 98 ... 116   Go Up
« previous next »