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Author Topic: CHEM AND BIO HELP AND TIPS HERE  (Read 346518 times)

Offline @d!_†oX!©

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Re: ~~~All Chemistry Doubts Here~~~
« Reply #210 on: November 12, 2009, 02:13:02 pm »
dude...u are just trying to fool around...dekh ab sochle koi fayeda to hai nahi...i dont even understand why people discuss after they are out of the examination hal...cuz u cant change anythhing now....so whats the point....
nd it doesn't matter if i 68/80/76 cuz wha will matter is what u'll get on 25th jan
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Offline Ghost Of Highbury

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Re: ~~~All Chemistry Doubts Here~~~
« Reply #211 on: November 12, 2009, 02:14:19 pm »
extremely generalized statement. its other's viewpoint dude, ppl like me discuss because it gives us satisfaction. simple.
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Offline ~~~~shreyapril~~~~

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Re: ~~~All Chemistry Doubts Here~~~
« Reply #212 on: November 12, 2009, 02:21:06 pm »
i dont discuss because i dont remmeber the quesrtions and ans!! :P
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Offline @d!_†oX!©

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Re: ~~~All Chemistry Doubts Here~~~
« Reply #213 on: November 12, 2009, 02:22:47 pm »
satisfaction.....surely it does...to me too..but still i insist on not discussing...
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Offline Ghost Of Highbury

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Re: ~~~All Chemistry Doubts Here~~~
« Reply #214 on: November 12, 2009, 02:25:51 pm »
sure, ur wish
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Offline ~~~~shreyapril~~~~

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Re: ~~~All Chemistry Doubts Here~~~
« Reply #215 on: November 12, 2009, 02:26:51 pm »
By the way one last question whoever can ans it!!

it is an add. math paper

pls see my thread

i am hortly goign to post it
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Offline buzywidbizworld

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Re: ~~~All Chemistry Doubts Here~~~
« Reply #216 on: November 15, 2009, 02:11:07 pm »
Guyz can any1 of u plz help me wid this Q.

11 For complete combustion, one molecule of an organic compound needs 8 molecules of oxygen.
What could the formula of this compound be?
A C5H11OH
B C6H9OH
C C6H11OH
D C6H12

The ans is B.C6H9OH
but hw do u derive @ this.
I had thugt it wud b D. but its wrong
Need an xplanation 4 the ans
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Offline @d!_†oX!©

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Re: ~~~All Chemistry Doubts Here~~~
« Reply #217 on: November 15, 2009, 02:20:35 pm »
okk see
its says 8 molecules of oxygen
which means a total of 16 O's in the balanced equation
now write the equation:
X + 8O2 ---> CO2 + H2O
so if we have A (C5H11OH)
then to balance for C u have to put 5 b4 CO2, which will make 10 O's so left would be 6 O's but u cannot put a 6....
hey wait...did u say u thought D as the right answer...??so which mark scheme did u check dude...the answer IS D!!!!!!
lol...just re-check man
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Offline Ghost Of Highbury

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Re: ~~~All Chemistry Doubts Here~~~
« Reply #218 on: November 15, 2009, 02:22:59 pm »
@adi - D cant be the answer.

C6H12 + 8O2 --> 6CO2 + 6H2O

not balanced.  

C6H9OH + 8O2 -->  6CO2 + 5H2O

now its balanced. so yea just balance and check for the answer.
« Last Edit: November 15, 2009, 02:24:47 pm by A@di »
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Offline buzywidbizworld

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Re: ~~~All Chemistry Doubts Here~~~
« Reply #219 on: November 15, 2009, 02:28:30 pm »
Quote from: @d!_†oX!© on November 15, 2009, 02:20:35 pm
okk see
its says 8 molecules of oxygen
which means a total of 16 O's in the balanced equation
now write the equation:
X + 8O2 ---> CO2 + H2O
so if we have A (C5H11OH)
then to balance for C u have to put 5 b4 CO2, which will make 10 O's so left would be 6 O's but u cannot put a 6....
hey wait...did u say u thought D as the right answer...??so which mark scheme did u check dude...the answer IS D!!!!!!
lol...just re-check man


i chkd the ms and the ans is still B. D isn't the ri8 ans.
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Offline @d!_†oX!©

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Re: ~~~All Chemistry Doubts Here~~~
« Reply #220 on: November 15, 2009, 02:30:31 pm »
ooooooohhhhh....m soo sorry busy and aadi...actually i did another question today similar to this one...and while explaining i recalled dt the answer was D...so didnt apply my mind there...m sorry...yeah...the answer is B
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Offline buzywidbizworld

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Re: ~~~All Chemistry Doubts Here~~~
« Reply #221 on: November 15, 2009, 02:31:13 pm »
Quote from: A@di on November 15, 2009, 02:22:59 pm
@adi - D cant be the answer.

C6H12 + 8O2 --> 6CO2 + 6H2O

not balanced.  

C6H9OH + 8O2 -->  6CO2 + 5H2O

now its balanced. so yea just balance and check for the answer.

Thanks Aadi. I tried balancing it earlier but the cud not do it properly Thanks 4 xplainin!

@Aditoxic Thanks 4 ur help 2
« Last Edit: November 15, 2009, 02:42:23 pm by buzywidbizworld »
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Offline Ghost Of Highbury

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Re: ~~~All Chemistry Doubts Here~~~
« Reply #222 on: November 15, 2009, 02:33:14 pm »
hey thats k..no issues...

er, do u mind modifying my name there...because i'm a little wary of letting out my name in this public forum? hope u dont mind
thanks! :D
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Offline buzywidbizworld

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Re: ~~~All Chemistry Doubts Here~~~
« Reply #223 on: November 15, 2009, 02:37:41 pm »
sry 4 da inconvience caused
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Offline Ghost Of Highbury

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Re: ~~~All Chemistry Doubts Here~~~
« Reply #224 on: November 15, 2009, 02:38:42 pm »
no thats completely fine...just edit it, if ur unable to do that, inform me, i'll do it.. :)
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