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Author Topic: CHEM AND BIO HELP AND TIPS HERE  (Read 350914 times)

Offline Ghost Of Highbury

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Re: ~~~All Chemistry Doubts Here~~~
« Reply #195 on: November 11, 2009, 04:17:26 pm »
for 4biii)

the reaction

AlCl3 + 3NaOH --> Al(OH)3 + 3NaCl

Al(OH)3 is insoluble (precipitated), however, when all AlCl3 is reacted, the excess NaOH that is added reacts with Al(OH)3

Al(OH)4- ions are formed in the presence of high concentrations of hydroxide: this is soluble. Thus all the precipitate dissolves and the height of the precipitate becomes 0. for the graph, just draw a rough graph where it continues till the maximum point but falles to 0 when excess is added.
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Offline Ghost Of Highbury

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Re: ~~~All Chemistry Doubts Here~~~
« Reply #196 on: November 11, 2009, 04:21:29 pm »
hope u understood.  :)
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Offline $!$RatJumper$!$

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Re: ~~~All Chemistry Doubts Here~~~
« Reply #197 on: November 11, 2009, 07:23:18 pm »
guys whats the formula to calculate percentage yeild?
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Offline cooldude

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Re: ~~~All Chemistry Doubts Here~~~
« Reply #198 on: November 11, 2009, 08:14:07 pm »
Quote from: $!$RatJumper$!$ on November 11, 2009, 07:23:18 pm
guys whats the formula to calculate percentage yeild?

(actual yield/theoretical yield)*100
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Offline ~~~~shreyapril~~~~

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Re: ~~~All Chemistry Doubts Here~~~
« Reply #199 on: November 12, 2009, 06:11:55 am »
enjoyed chem ;)
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Offline nits94

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Re: ~~~All Chemistry Doubts Here~~~
« Reply #200 on: November 12, 2009, 07:17:06 am »
ya was actually good :) :)
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Offline ~~~~shreyapril~~~~

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Re: ~~~All Chemistry Doubts Here~~~
« Reply #201 on: November 12, 2009, 07:45:43 am »
just good ???

i thought very good :P
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Offline nits94

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Re: ~~~All Chemistry Doubts Here~~~
« Reply #202 on: November 12, 2009, 09:45:59 am »
fine very very good :P :P
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Offline ~~~~shreyapril~~~~

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Re: ~~~All Chemistry Doubts Here~~~
« Reply #203 on: November 12, 2009, 09:46:34 am »
ok...!!

wahtever you say double that much good!! :P
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Offline Ghost Of Highbury

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Re: ~~~All Chemistry Doubts Here~~~
« Reply #204 on: November 12, 2009, 09:58:01 am »
increased my expectations after discussing it with a guy.

77+ :P
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Offline @d!_†oX!©

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Re: ~~~All Chemistry Doubts Here~~~
« Reply #205 on: November 12, 2009, 10:34:00 am »
ll...discuss with me nd u'll say 80!! :P
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Offline Saladin

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Re: ~~~All Chemistry Doubts Here~~~
« Reply #206 on: November 12, 2009, 10:47:05 am »
hey ppl, this is urs truly, just asking u, how was chem???

please refrain from stating actual qs...

becasue we are not allowed to do so until a 24h time period??
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Offline Ghost Of Highbury

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Re: ~~~All Chemistry Doubts Here~~~
« Reply #207 on: November 12, 2009, 12:04:45 pm »
chem paper 3 was fantastic...expecting 76+ / 80
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Offline ~~~~shreyapril~~~~

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Re: ~~~All Chemistry Doubts Here~~~
« Reply #208 on: November 12, 2009, 02:08:39 pm »
dude aadi tera to expectations are decreasing wid each post.. :P :)
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Offline Ghost Of Highbury

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Re: ~~~All Chemistry Doubts Here~~~
« Reply #209 on: November 12, 2009, 02:10:12 pm »
till now i have lost only 1 mark. so here and there count kar ke..76+ safer side!
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