« previous next »
Pages: [1] 2 3 ... 25   Go Down

Author Topic: CHEMISTRY PAPER 1 HERE  (Read 38365 times)

Offline mubashir

  • Newbie
  • *
  • Posts: 22
  • Reputation: -1478
CHEMISTRY PAPER 1 HERE
« on: June 10, 2009, 11:47:43 am »
Since everybody races to start one of these topics  :-*
Logged

Offline john12345

  • Newbie
  • *
  • Posts: 19
  • Reputation: -3
Re: CHEMISTRY PAPER 1 HERE
« Reply #1 on: June 10, 2009, 12:50:06 pm »
Hey can someone please solve this question and help me with the answer

i have attached the question below as a word document or else if u have de paper, it is question no 13 of november 1998
Logged

Offline john12345

  • Newbie
  • *
  • Posts: 19
  • Reputation: -3
Re: CHEMISTRY PAPER 1 HERE
« Reply #2 on: June 10, 2009, 12:53:21 pm »
also if anyone can please help me with question number 15 in november 1998



Logged

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: CHEMISTRY PAPER 1 HERE
« Reply #3 on: June 10, 2009, 12:55:07 pm »
don't have the paper

plzz upload it hre

i think the no 13 answer is D.....chlorine produced at the postitive side and sodium at negative

whats the answer in the markscheme
Logged
divine intervention!

Offline esso

  • SF Citizen
  • ***
  • Posts: 147
  • Reputation: 25
Re: CHEMISTRY PAPER 1 HERE
« Reply #4 on: June 10, 2009, 01:26:02 pm »
the answer is d cause chlorine is produced at the anode ,,, and because it bleaches the indicator the colour becomes white near the anode.....
and at the cathode the alkali is formed which turns indicator blue....

hope i helped,,,,....
Logged

Offline esso

  • SF Citizen
  • ***
  • Posts: 147
  • Reputation: 25
Re: CHEMISTRY PAPER 1 HERE
« Reply #5 on: June 10, 2009, 01:31:01 pm »
the answer of 15 in nov 1998 is c....

because to make a reaction go slower.... we have to make the solid bigger...therefore less particles take part in the reaction...leading to less collision and a slower rate of rxn....

option 2 , is to make it less conc. this leads to less solute particles in da acid....therefore slower rate of rxn....


hope i helped...... :)
Logged

Offline john12345

  • Newbie
  • *
  • Posts: 19
  • Reputation: -3
Re: CHEMISTRY PAPER 1 HERE
« Reply #6 on: June 10, 2009, 02:13:25 pm »
Quote from: esso on June 10, 2009, 01:26:02 pm
the answer is d cause chlorine is produced at the anode ,,, and because it bleaches the indicator the colour becomes white near the anode.....
and at the cathode the alkali is formed which turns indicator blue....

hope i helped,,,,....

Hey but what alkali is formed at the cathode
shouldnt hydrogen be formed at the cathode??

Logged

Offline john12345

  • Newbie
  • *
  • Posts: 19
  • Reputation: -3
Re: CHEMISTRY PAPER 1 HERE
« Reply #7 on: June 10, 2009, 02:15:45 pm »
Quote from: esso on June 10, 2009, 01:31:01 pm
the answer of 15 in nov 1998 is c....

because to make a reaction go slower.... we have to make the solid bigger...therefore less particles take part in the reaction...leading to less collision and a slower rate of rxn....

option 2 , is to make it less conc. this leads to less solute particles in da acid....therefore slower rate of rxn....


hope i helped...... :)

ya Thanks a lot for de help. ive + repped u
however for this question de markscheme says A
isnt de markscheme wrong
Logged

Offline persian17

  • Newbie
  • *
  • Posts: 16
  • Reputation: 0
Re: CHEMISTRY PAPER 1 HERE
« Reply #8 on: June 10, 2009, 02:20:18 pm »
Can anyone upload the papers from below 1999?
Logged

Offline cherrip

  • Newbie
  • *
  • Posts: 12
  • Reputation: 8
Re: CHEMISTRY PAPER 1 HERE
« Reply #9 on: June 10, 2009, 02:24:12 pm »
hey can anyne help me with this question please..
Its nov 07 ques 31... mark scheme says it should be B, i say its C..
can anyone tell me how?shouldnt it b C as oxygen is whats added to iron?
Thanks in advance ;D
Logged

Offline Tammy

  • SF Immigrant
  • **
  • Posts: 62
  • Reputation: 19
Re: CHEMISTRY PAPER 1 HERE
« Reply #10 on: June 10, 2009, 02:39:13 pm »
Yes, hydrogen is produced at the negative electrode, but if you look at the solution left: it's NaOH which is basic.

   Na+         Cl-
   H+          OH-

The ones coloured red are the ones that are produced at the electrodes, and what's left is Sodium hydroxide.
Logged

Offline Incognito_0

  • Newbie
  • *
  • Posts: 15
  • Reputation: 2
Re: CHEMISTRY PAPER 1 HERE
« Reply #11 on: June 10, 2009, 02:44:19 pm »
Hi..
Can someone please tell me where i can find the old past papers like from the 90's?

Thanks :D
Logged

Offline astarmathsandphysics

  • SF Overlord
  • *********
  • Posts: 11271
  • Reputation: 65534
  • Gender: Male
  • Free the exam papers!
Re: CHEMISTRY PAPER 1 HERE
« Reply #12 on: June 10, 2009, 02:51:43 pm »
They are torrented on www.freeetextbooks.com
Logged

Offline dondon93

  • Newbie
  • *
  • Posts: 7
  • Reputation: 4
Re: CHEMISTRY PAPER 1 HERE
« Reply #13 on: June 10, 2009, 02:52:31 pm »
Hey people :)
PLease, does anyone have chemistry paper1 1999 till 2002 MARKING SCHEME??
I really need them guys , it is really important..
What is the use if I have the question papers and I don't have the marking scheme??
If anyone has, please say.... It will help us all.....
Logged

Offline Malak

  • Honorary Member
  • SF Farseer
  • *****
  • Posts: 4454
  • Reputation: 65534
  • A warm smile is the universal language of kindness
Re: CHEMISTRY PAPER 1 HERE
« Reply #14 on: June 10, 2009, 02:59:43 pm »
Quote from: dondon93 on June 10, 2009, 02:52:31 pm
Hey people :)
PLease, does anyone have chemistry paper1 1999 till 2002 MARKING SCHEME??
I really need them guys , it is really important..
What is the use if I have the question papers and I don't have the marking scheme??
If anyone has, please say.... It will help us all.....

I only have 2001-2002 Ms
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
Pages: [1] 2 3 ... 25   Go Up
« previous next »