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Author Topic: Chemistry Help HERE ONLY !!  (Read 106020 times)

nid404

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Re: Chemistry Help HERE ONLY !!
« Reply #765 on: June 08, 2009, 07:09:12 pm »
It's chromium

reactivity series http://www.chemos.co.uk/Reactivity.htm
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Offline °o.O-hash94-O.o°

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Re: Chemistry Help HERE ONLY !!
« Reply #766 on: June 08, 2009, 07:10:33 pm »
ok i will tell this to my friend!

thanks!!!!!!
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nid404

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Re: Chemistry Help HERE ONLY !!
« Reply #767 on: June 08, 2009, 07:11:02 pm »
anytime :)
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Offline MaNa

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Re: Chemistry Help HERE ONLY !!
« Reply #768 on: June 11, 2009, 02:03:07 pm »
ANYONE HAS MARKSCHEME FROm2001-2004(not  2002)
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Offline sundars

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Re: Chemistry Help HERE ONLY !!
« Reply #769 on: June 11, 2009, 02:05:10 pm »
You can get on freeexapapers.com.
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Offline Priceless

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Re: Chemistry Help HERE ONLY !!
« Reply #770 on: June 11, 2009, 02:05:47 pm »
hey ya....i du as a matter of fact....pm me ur email...i ll send it across 2 u :)
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Offline MaNa

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Re: Chemistry Help HERE ONLY !!
« Reply #771 on: June 11, 2009, 02:10:18 pm »
Quote from: Priceless on June 11, 2009, 02:05:47 pm
hey ya....i du as a matter of fact....pm me ur email...i ll send it across 2 u :)
thankyou so mcuh cheak ur messages
i have pmd uL)
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Offline lana

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Re: Chemistry Help HERE ONLY !!
« Reply #772 on: June 11, 2009, 06:31:47 pm »
hi ... can anyone explain to me question 16 in paper 1 m/j/07 thanks ...!!! i think it should be B but the mark scheme says it's C
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Offline Ghost Of Highbury

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Re: Chemistry Help HERE ONLY !!
« Reply #773 on: June 11, 2009, 06:35:08 pm »
S has many oxidation states including -2,0,2,4,6...
in this particular reaction the oxidation state of S is "+2"
a decrease in oxidation state - reduction
an increase in oxidation state - oxidation

1.) S + O2 -> SO2
     here at the left handside, as sulphur exists itself (not compound), the oxidation state is 0
          at the right hand sidde it forms a compound and gains an oxidation state of +2 = this is oxidation
          whereas O has an oxidation state of "0" in the left hand side and decreases to -4 in the right hand side
               this is reduction

therefore its redox

---------
2.) the sulphur gains oxygen atoms (oxidation) and the oxidation state of oxygen reduces..(reduction)
therefore it is redox

so the answer is "C"
1 and 2
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Offline lana

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Re: Chemistry Help HERE ONLY !!
« Reply #774 on: June 11, 2009, 06:38:23 pm »
thank you =]
+rep
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Offline VIP_93

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Re: Chemistry Help HERE ONLY !!
« Reply #775 on: June 11, 2009, 07:50:24 pm »
can any 1 plz post chemistry past papers from 93 _ 95 and their mark scheme.

thanx in advance
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Offline kam

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Re: Chemistry Help HERE ONLY !!
« Reply #776 on: June 12, 2009, 05:17:56 am »
hi
um can someone help me with
may june 2007 que 7
why the hell is it c??
helppp pllzzz :)
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Offline kam

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Re: Chemistry Help HERE ONLY !!
« Reply #777 on: June 12, 2009, 05:29:13 am »
actually forget tht
i know the answer now thx ET :-*
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Offline susman

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Re: Chemistry Help HERE ONLY !!
« Reply #778 on: June 12, 2009, 05:35:47 am »
yeah me too the same question
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Offline Ghost Of Highbury

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Re: Chemistry Help HERE ONLY !!
« Reply #779 on: October 26, 2009, 07:36:35 am »
Quote from: annie_angel on May 28, 2009, 02:16:02 pm
my friend tought me an easier way to study these...luk up^^^^
HOPES THIS HELPS  :D

i remember it this way..

PAMELA SANDURST CAUGHT MAN AND CAT, ZIPPED IT TO LUDHIANA, HARYANA COPS SOLD GUARDIAN PAMELA.

LOL..THE REACTIVITY SERIES
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