Author Topic: Help wid chemistry  (Read 1451 times)

Offline buzywidbizworld

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Help wid chemistry
« on: November 06, 2009, 02:33:07 pm »
can any1 tell me wat am i suppose 2 knw in fuel cells because am thoroughly confused ??? wid the topic.

wat shud i write if am aked to define exothermic? am i suppoed to write bout da bond formin or bout da release of heat. 
« Last Edit: November 06, 2009, 02:41:29 pm by buzywidbizworld »
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Offline Ghost Of Highbury

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Re: Help wid chemistry
« Reply #1 on: November 06, 2009, 03:22:20 pm »
Exothermic is heat given out, and this happens when new bonds are formed. The energy change is negative.
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Offline Ghost Of Highbury

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Re: Help wid chemistry
« Reply #2 on: November 06, 2009, 03:24:43 pm »
fuel cells with acid electrolyte..

heres. it..

the hydrogen (H2) loses electrons.. 2H2 --> 4H+ + 4e- which travel through the circuit to the cathode and react with O2..also the H+ ions from the acid electrolyte meets the electrons and O2 at the cathode

the reaction

O2 + 4H+ + 4e- = 2H2O
----------------------------------
with NaOH

Then the reactions are as follows:-
At anode:      2H2  +  4OH(-) --->4H2O  +  4e(-)
At cathode:   O2 + 4e(-) +2H2O ---->4OH(-)

anode - the hydrogen supplied reacts with the OH- ion form NaOH and forms water and electrons. Electrons flow round the circuit (electricity) and react at the cathode with water and O2 supplied.

The OH- ions removed at the anode are replaced by those formed at the cathode.


« Last Edit: November 06, 2009, 03:31:03 pm by A@di »
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Offline @d!_†oX!©

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Re: Help wid chemistry
« Reply #3 on: November 07, 2009, 09:03:50 am »
https://studentforums.biz/index.php/topic,4304.0.html

this is the place fr u to go buzywidbizworld
AAL IZZ WELL!!! ;)

Offline buzywidbizworld

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Re: Help wid chemistry
« Reply #4 on: November 07, 2009, 03:40:47 pm »
Hey Aadi n aditoxic,
Thanks alot nw am very much clear wid da topic.
« Last Edit: November 07, 2009, 03:50:32 pm by buzywidbizworld »
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Offline @d!_†oX!©

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Re: Help wid chemistry
« Reply #5 on: November 07, 2009, 04:08:08 pm »
anytime dude!!! :)
AAL IZZ WELL!!! ;)

Offline dlehddud

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Re: Help wid chemistry
« Reply #6 on: November 09, 2009, 05:57:49 am »
anytime dude!!! :)

buzywidbizworld's a girl isn't she? lol

I swear exams are going to be the end of me someday

Offline ~~~~shreyapril~~~~

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Re: Help wid chemistry
« Reply #7 on: November 09, 2009, 06:51:18 am »
so wat why cant a girl be dude???
Friendship is like peeing on yourself. Everyone can see it but only you get the warm feeling that it gives :D :P :)

Offline dlehddud

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Re: Help wid chemistry
« Reply #8 on: November 09, 2009, 07:31:40 am »
so wat why cant a girl be dude???

i thought dude is used when referring to a guy? isn't it?
I swear exams are going to be the end of me someday

Offline ~~~~shreyapril~~~~

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Re: Help wid chemistry
« Reply #9 on: November 09, 2009, 07:33:23 am »
pata nahin!!
Friendship is like peeing on yourself. Everyone can see it but only you get the warm feeling that it gives :D :P :)