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Author Topic: Chemistry Help!  (Read 7773 times)

Offline astarmathsandphysics

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Re: Chemistry Help!
« Reply #30 on: April 26, 2009, 10:03:59 pm »
It is a fundamental principal of nature to strive for the least energy, which is why for exa,ple, balls roll down hills. When an atom splits, the two separate particles have less energy than the original atom. The difference is released as a gamma ray.
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Offline Naruto

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Re: Chemistry Help!
« Reply #31 on: April 26, 2009, 10:41:37 pm »
Oh,Thanks i dint knew this principle.
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Offline Wahab09

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Re: Chemistry Help!
« Reply #32 on: April 27, 2009, 12:28:28 am »
doesnt the caesium gain stability ???

sweetsh its not in the syallbus dont worry  ;D.. u sittin the ig's?
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Offline sweetsh

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Re: Chemistry Help!
« Reply #33 on: April 27, 2009, 08:27:21 am »
Yes I am. But I was not concentrating sorry guys I misunderstood things
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Offline hyebyekadal

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Re: Chemistry Help!
« Reply #34 on: April 27, 2009, 01:57:46 pm »
thats not CHEM!
lol is that sth from a phy paper?
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Offline SGVaibhav

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Re: Chemistry Help!
« Reply #35 on: April 27, 2009, 02:27:26 pm »
ANION TEST

Any kool ways to remember anion test for

HALIDES
NITRATE
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Offline sweetsh

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Re: Chemistry Help!
« Reply #36 on: April 27, 2009, 05:40:56 pm »
I dont have a "cool" way.
But its simply that:
Cl- : with HNO3 and AgNO3 -> white ppt
                                               with HNO3 and Pb(NO3)2 -> white ppt

Br- : with HNO3 and AgNO3 -> pale yellow ppt
                                                 with HNO3 and Pb(NO3)2 -> pale yellow ppt     

I-: with HNO3 and AgNO3 -> yellow ppt.
                                                  with HNO3 and Pb(NO3)2 -> yellow ppt.


For (NO3)- :
1) add NaOH
2)Add Al particles(powder foils or granuels)
3)put a damp red litmus on the mouth of the test tube.
4)warm gently

Result:
1)pungent smell
2) red litmus paper will then turn to blue
beacuase NH3 is formed

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Offline emi

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Re: Chemistry Help!
« Reply #37 on: April 27, 2009, 06:22:49 pm »
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Offline sweetsh

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Re: Chemistry Help!
« Reply #38 on: April 27, 2009, 06:27:25 pm »
Yes I know this website its useful.I mean the above one.
But people should know that it includes also notes out of our IGCSE syllabus. Just not to get confused
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Offline emi

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Re: Chemistry Help!
« Reply #39 on: April 27, 2009, 06:44:40 pm »
yeah ur right ,, its not exactly our syllabus stuff .. but still  u guys can study the things which are ,, it briefs them nicely
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Offline SGVaibhav

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Re: Chemistry Help!
« Reply #40 on: April 27, 2009, 06:57:25 pm »
 >:( >:( >:( >:( >:( >:( >:( >:( >:( >:( >:( >:( >:( >:( >:( >:( >:( >:(
i am going to write this on my background!!
nice idea!
koool
 :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :)
 ;) ;) ;) ;) ;) ;) ;) ;) ;) ;) ;) ;) ;) ;) ;) ;) ;) ;) ;) ;) ;) ;) ;) ;) ;) ;) ;) ;)
 :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D
 ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D
 :o :o :o :o :o :o :o :o :o :o :o :o :o :o :o :o :o :o :o :o :o :o :o :o :o
 8) 8) 8) 8) 8) 8) 8) 8) 8) 8) 8) 8) 8) 8) 8) 8) 8) 8) 8) 8) 8) 8) 8) 8) 8)
 :P :P :P :P :P :P :P :P :P :P :P :P :P :P :P :P :P :P :P :P :P :P :P :P :P

WHO UNderstood fuel cell?
is it there in syllabus?

i never understood it
i was taught last year
i asked soo manny ppl,
By the way i lost hope now
NO Hope
cant understand
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Offline sweetsh

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Re: Chemistry Help!
« Reply #41 on: April 27, 2009, 07:01:39 pm »
sgvaibhav if you noticed I answered your question above
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Offline SGVaibhav

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Re: Chemistry Help!
« Reply #42 on: April 27, 2009, 07:04:20 pm »
?? ???

i got the answer.
i am angry at that freaking aluminium powders, with those squeaky clorides and bugging bromides. they form a family of idiotic halides.
:@

but i got a kool idea

any idea how to put this as a screen saver or as a background?
« Last Edit: April 27, 2009, 07:07:30 pm by sgvaibhav »
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Offline sweetsh

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Re: Chemistry Help!
« Reply #43 on: April 27, 2009, 07:37:24 pm »
Good you did. No print them and stick them near to your bed so you dream of them =)
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Offline junky demon

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Re: Chemistry Help!
« Reply #44 on: April 29, 2009, 10:50:30 am »
can sum1 plz suggest wat parts of wich topics are important for chemistry-alternative to practical(paper 6),cuz i hv lately chnged from commerce to science. :-\cnt understand wats imp n watz with the examination point of view..
appreciated...
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