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Author Topic: Chemistry Help HERE ONLY !!  (Read 107545 times)

Offline SGVaibhav

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Re: Chemistry Help HERE ONLY !!
« Reply #405 on: May 30, 2009, 11:48:52 am »
So can u show me the answer please
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nid404

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Re: Chemistry Help HERE ONLY !!
« Reply #406 on: May 30, 2009, 11:49:16 am »
Quote from: sgvaibhav on May 30, 2009, 11:44:21 am
i think it is the same thing
lol im dumb       >:( >:( >:( >:( >:( >:( >:( >:(


but are you sure that we are supposed to do this only and there is nothing else involved?

when they give you the carboxyl and diamide u do this but when they ask for the formula of the nylon)as in in the q u asked) u simply replace the boxes with the group(alkane) (CH2)6
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zara

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Re: Chemistry Help HERE ONLY !!
« Reply #407 on: May 30, 2009, 11:50:52 am »
@thukin
ahaan!!!
 :D :D
lollzz...
but still ull use such wrds n ull end up gettin mor -reps...
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Offline thukon

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Re: Chemistry Help HERE ONLY !!
« Reply #408 on: May 30, 2009, 11:52:51 am »
b4... i said that the general formula of alkyls is Cn H2n-1. MISTAKE!!!!Its Cn H2n+1.
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zara

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Re: Chemistry Help HERE ONLY !!
« Reply #409 on: May 30, 2009, 11:55:44 am »
yea its +1...u betta modify it in the previous post so dat others dont get mistaken....
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Offline SGVaibhav

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Re: Chemistry Help HERE ONLY !!
« Reply #410 on: May 30, 2009, 11:56:53 am »
Quote from: zara on May 30, 2009, 11:50:52 am
@thukin
ahaan!!!
 :D :D
lollzz...
but still ull use such wrds n ull end up gettin mor -reps...

he cant get -rep because that post has already been edited  :P
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Offline thukon

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Re: Chemistry Help HERE ONLY !!
« Reply #411 on: May 30, 2009, 12:03:29 pm »
My b word may have been removed and changed to "wach ur vocab", but zara quoted me, and there it hasnt changed. OOpsies. Looks like a little studentforums bug. The inability to change quotes.
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nid404

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Re: Chemistry Help HERE ONLY !!
« Reply #412 on: May 30, 2009, 12:03:47 pm »
vaibhav have a look at the pdf

I have drawn the structure of the nylon
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Offline unknown 101

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Re: Chemistry Help HERE ONLY !!
« Reply #413 on: May 30, 2009, 12:05:50 pm »
hahaha lol thukon
anywayz i have a question for everybody
how would u find the percentage of oxygen in a gas jar that contains 150 cm3 of air?
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nid404

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Re: Chemistry Help HERE ONLY !!
« Reply #414 on: May 30, 2009, 12:15:21 pm »
Quote from: LilWayne on May 30, 2009, 12:05:50 pm
hahaha lol thukon
anywayz i have a question for everybody
how would u find the percentage of oxygen in a gas jar that contains 150 cm3 of air?

u like testing others. don't u??

well i believe it is 20% of the volume
that would be 30cm3

now tell us the right ans "LIL" teacher :P
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Offline thukon

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Re: Chemistry Help HERE ONLY !!
« Reply #415 on: May 30, 2009, 12:18:54 pm »
Quote from: LilWayne on May 30, 2009, 12:05:50 pm
hahaha lol thukon
anywayz i have a question for everybody
how would u find the percentage of oxygen in a gas jar that contains 150 cm3 of air?
Wait, was it a test, or is it ur own genuine doubt, and do these kind of questions appear in IGCSE which means we have to MUG UP THE PERCENTAGES OF DIFFERENT GASES IN THE ATMOSPHERE?!
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Offline unknown 101

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Re: Chemistry Help HERE ONLY !!
« Reply #416 on: May 30, 2009, 12:20:52 pm »
Quote from: nid404 on May 30, 2009, 12:15:21 pm
Quote from: LilWayne on May 30, 2009, 12:05:50 pm
hahaha lol thukon
anywayz i have a question for everybody
how would u find the percentage of oxygen in a gas jar that contains 150 cm3 of air?

u like testing others. don't u??

well i believe it is 20% of the volume
that would be 30cm3

now tell us the right ans "LIL" teacher :P

ahahaha, yeah i do like testin ppl, lol
anyone else before i give the answe

and thukon this question came up before in one of the pastpapers, and it just requires a little thinking
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nid404

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Re: Chemistry Help HERE ONLY !!
« Reply #417 on: May 30, 2009, 12:21:36 pm »
Quote from: thukon on May 30, 2009, 12:18:54 pm
Quote from: LilWayne on May 30, 2009, 12:05:50 pm
hahaha lol thukon
anywayz i have a question for everybody
how would u find the percentage of oxygen in a gas jar that contains 150 cm3 of air?
Wait, was it a test, or is it ur own genuine doubt, and do these kind of questions appear in IGCSE which means we have to MUG UP THE PERCENTAGES OF DIFFERENT GASES IN THE ATMOSPHERE?!

yup those of nitrogen, oxygen and CO2

79%,20% and 0.04% respectively
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Offline thukon

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Re: Chemistry Help HERE ONLY !!
« Reply #418 on: May 30, 2009, 12:24:08 pm »
Im guessing you have to burn the gas and measure the final volune, but most probably wrong because CO2 is produced. And lilwayne, ur signature pic is giving me seizures. lol.
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nid404

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Re: Chemistry Help HERE ONLY !!
« Reply #419 on: May 30, 2009, 12:29:01 pm »
keep iron filings in a jar with 150cm3 of air. Keep this jar inverted over a trough filled with water. note the rise in volume of water. this is the volume of air displaced is the volume of oxygen
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