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Author Topic: CHEM AND BIO HELP AND TIPS HERE  (Read 333202 times)

Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #930 on: May 17, 2010, 08:43:12 am »
Quote from: ~VIN1094~ on May 17, 2010, 08:38:48 am
used as an indicator .. to check the presence of iodine .. solved this one yest ;)

yea but why check if iodine is present ?
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Offline guMnam

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #931 on: May 17, 2010, 08:47:01 am »
Quote from: Kimo Jesus on May 17, 2010, 08:36:31 am
m/j 2007 qeustion 4

http://www.freeexampapers.us/IGCSE/Chemistry/CIE/2007%20Jun/0620_s07_qp_6.pdf

whats goin on ? i dunno how to asnwr (a)
Same ppr q 5 (d) ???never heard of such a thin in ma whole life  ?? can some one ans this:)
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Offline MasterMath

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #932 on: May 17, 2010, 08:48:31 am »
Guys where can i find past papers before 2001 ... theyre not on this website .. i just wanted to look at them to check how they are and stuff
IM talking about chemistry paper 6
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Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #933 on: May 17, 2010, 08:49:45 am »
Quote from: gumnam on May 17, 2010, 08:47:01 am
Same ppr q 5 (d) ???never heard of such a thin in ma whole life  ?? can some one ans this:)

its an iodine test

SOLID C IS LEAD CARBONA + HNO3 and theres potassium iodide
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Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #934 on: May 17, 2010, 08:50:53 am »
Quote from: MasterMath on May 17, 2010, 08:48:31 am
Guys where can i find past papers before 2001 ... theyre not on this website .. i just wanted to look at them to check how they are and stuff
IM talking about chemistry paper 6

http://www.freeexampapers.us/IGCSE/Chemistry/CIE/1993-2003/ChemistryExamP61993-2003.pdf
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Offline MasterMath

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #935 on: May 17, 2010, 08:57:43 am »
That includes paper 6 ?
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Offline polltery

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #936 on: May 17, 2010, 08:58:13 am »
help me wid this Q plz!!! :S
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Offline guMnam

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #937 on: May 17, 2010, 08:58:52 am »
Quote from: Kimo Jesus on May 17, 2010, 08:49:45 am
its an iodine test

SOLID C IS LEAD CARBONA + HNO3 and theres potassium iodide
Thanks but i thought test for iodine is add nitric acid then add lead(II)nitrate....yellow ppt.
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Offline guMnam

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #938 on: May 17, 2010, 09:01:04 am »
Quote from: polltery on May 17, 2010, 08:58:13 am
help me wid this Q plz!!! :S
the 30 c one i think caz it should fall constantly:D 40 on x and 30 on y:D
« Last Edit: May 17, 2010, 09:09:42 am by gumnam »
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Offline guMnam

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #939 on: May 17, 2010, 09:02:32 am »
Quote from: polltery on May 17, 2010, 08:58:13 am
help me wid this Q plz!!! :S
which paper is it By the way
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Offline polltery

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #940 on: May 17, 2010, 09:05:27 am »
Quote from: gumnam on May 17, 2010, 09:02:32 am
which paper is it By the way

June 2009 .. 06! ..... i wanted to know ..where to draw the lines ?.?
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Offline Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #941 on: May 17, 2010, 09:07:47 am »
Quote from: Kimo Jesus on May 17, 2010, 08:43:12 am
yea but why check if iodine is present ?

dunno i wrote because "Starch" always follows "Iodine" .. =P .. i think to check whether all the iodine is reacted in the reaction .. because for this reaction Iodine ions are formed before .. it is not a direct reaction .. my sir told me .. we dont hav to learn the details .. trust me its very complicated .. (my sir also loves to show off his chemi ) :P :P
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Offline Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #942 on: May 17, 2010, 09:09:38 am »
Quote from: gumnam on May 17, 2010, 08:58:52 am
Thanks but i thought test for iodine is add nitric acid then add lead(II)nitrate....yellow ppt.

remember anything that involves Lead and Iodine is always "yellow ppt." .. read the main question u'll get me ..
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Offline guMnam

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #943 on: May 17, 2010, 09:16:24 am »
Quote from: polltery on May 17, 2010, 09:05:27 am
June 2009 .. 06! ..... i wanted to know ..where to draw the lines ?.?
here u go:D
« Last Edit: May 17, 2010, 09:22:54 am by gumnam »
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Offline Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #944 on: May 17, 2010, 09:17:24 am »
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