« previous next »
Pages: 1 [2] 3 4 5   Go Down

Author Topic: Chemistry Paper 1  (Read 6869 times)

nid404

  • Guest
Re: Chemistry Paper 1
« Reply #15 on: June 08, 2009, 06:57:32 pm »
Quote from: eddie_adi619 on June 08, 2009, 06:50:18 pm
for the 16th one i think its (b)

no adi it's D for sure. It's an explosive reaction..i have done lot of research. and for 39 i earlier posted C because i thought C was empirical so sorry abt that
Logged

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: Chemistry Paper 1
« Reply #16 on: June 08, 2009, 06:59:28 pm »
Quote from: jennie on June 08, 2009, 06:56:01 pm
16 = C
19 = B
39 = B
three answers confused,,,!!!

hey and i chked out in docbrown

they say that the speed of reaction in this experiment increases with time...but later slows down

are u sure??
and yaa its the empirical thingy..no problemm...!!
Logged
divine intervention!

nid404

  • Guest
Re: Chemistry Paper 1
« Reply #17 on: June 08, 2009, 07:03:36 pm »
Quote from: eddie_adi619 on June 08, 2009, 06:59:28 pm
Quote from: jennie on June 08, 2009, 06:56:01 pm
16 = C
19 = B
39 = B
three answers confused,,,!!!

hey and i chked out in docbrown

they say that the speed of reaction in this experiment increases with time...but later slows down

are u sure??
and yaa its the empirical thingy..no problemm...!!
they r normal reactions..the combustion of hydrogen is an explosive reaction...and so this is what happens..i'm 100% sure...i read one whole chapter of a book on explosive combustion reaction rates
Logged

nid404

  • Guest
Re: Chemistry Paper 1
« Reply #18 on: June 08, 2009, 07:07:39 pm »
Quote from: eddie_adi619 on June 08, 2009, 07:05:05 pm
okk..no problem..
thanks

where r the others..

no ones coming in to help others

all r busy in the chit-chat thrad



all busy loving sum1 :-X
Logged

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: Chemistry Paper 1
« Reply #19 on: June 08, 2009, 07:08:19 pm »
 :-X

take back ur words

haha..kidding
Logged
divine intervention!

nid404

  • Guest
Re: Chemistry Paper 1
« Reply #20 on: June 08, 2009, 07:15:11 pm »
Quote from: eddie_adi619 on June 08, 2009, 07:08:19 pm
:-X

take back ur words

haha..kidding

u better be .....lol
Logged

Offline esso

  • SF Citizen
  • ***
  • Posts: 147
  • Reputation: 25
Re: Chemistry Paper 1
« Reply #21 on: June 08, 2009, 08:55:06 pm »
Quote from: nid404 on June 08, 2009, 06:39:03 pm
19 is B
39 is B
16 is D(after a lot of research on explosion and reaction rate)


yah thats correct....
Logged

Offline jennie

  • Newbie
  • *
  • Posts: 9
  • Reputation: 0
Re: Chemistry Paper 1
« Reply #22 on: June 08, 2009, 09:11:18 pm »
Quick question: in 16, why does the hydrogen not start to react until a while into the experiment?
Logged

Offline sweetsh

  • Retired Adminstrator
  • SF V.I.P
  • ********
  • Posts: 7049
  • Reputation: 65535
  • Gender: Female
  • *Freedom
Re: Chemistry Paper 1
« Reply #23 on: June 08, 2009, 10:20:35 pm »
Which year? 08?
Logged

Offline kam

  • SF Geek
  • ****
  • Posts: 543
  • Reputation: 30
  • Gender: Female
  • its a real flowa too!
Re: Chemistry Paper 1
« Reply #24 on: June 08, 2009, 10:22:08 pm »
Quote from: sweetsh on June 08, 2009, 10:20:35 pm
Which year? 08?

hey ur back
nice ta see ya again
Logged

Offline sweetsh

  • Retired Adminstrator
  • SF V.I.P
  • ********
  • Posts: 7049
  • Reputation: 65535
  • Gender: Female
  • *Freedom
Re: Chemistry Paper 1
« Reply #25 on: June 08, 2009, 10:25:03 pm »
Thank you kam really appreciate it
Logged

nid404

  • Guest
Re: Chemistry Paper 1
« Reply #26 on: June 09, 2009, 05:16:42 am »
Quote from: jennie on June 08, 2009, 09:11:18 pm
Quick question: in 16, why does the hydrogen not start to react until a while into the experiment?

hydrogen does not react instantly...it requires to initiated(even thought the reaction is exothermic)..There's something known as an activation energy that it requires...and so does not react instantly. But once it starts reacting, the reaction produces immense heat, which is more than the optimum energy for the reaction...remember that the reaction is exothermic so very high temperatures do not favour the reaction and the yield of the product decreases with time.
Logged

Offline me...myself...n...i

  • Newbie
  • *
  • Posts: 40
  • Reputation: 3
Re: Chemistry Paper 1
« Reply #27 on: June 09, 2009, 06:29:56 am »
just wondering if any1 has the mark schemes to the paper 1 chemistry for d old papers..........
can u pls send them...
Logged

nid404

  • Guest
Re: Chemistry Paper 1
« Reply #28 on: June 09, 2009, 06:34:48 am »
Logged

Offline me...myself...n...i

  • Newbie
  • *
  • Posts: 40
  • Reputation: 3
Re: Chemistry Paper 1
« Reply #29 on: June 09, 2009, 07:03:54 am »
Quote from: nid404 on June 09, 2009, 06:34:48 am
here https://studentforums.biz/index.php/topic,2342.60.html and https://studentforums.biz/index.php/topic,2342.45.html

+rep hmh cuz he put it up

the ones that he put up are for physics....
i was wondering if u had the chem ones.... :)
Logged
Pages: 1 [2] 3 4 5   Go Up
« previous next »