Qualification > Sciences
CHEM AND BIO HELP AND TIPS HERE
WARRIOR:
--- Quote from: blackberry on June 06, 2010, 01:54:26 pm ---Got a doubt from the 2005 m/j paper 3 chemistry paper.
When 0.015 moles of iodine react with 0.045 moles of chlorine to form 0.030 moles of a single product. So, we have to complete the equation. The answer is:
I2 + 3Cl2 = 2ICl3 my question is how come theres 3 atms of Cl formed?
Oh and second question....when iodine reacts with zinc nd wen u decrease the concentration of iodine how come less of zinc is used up?
--- End quote ---
sincec ration is 1 : 3 : 2
and we normally get ICL
but since it is 2 ICL , we have have now 2 i odines and 2 chlorines
now we have to balance , 2 iodines on the left :D
but thre are 6 clhorines on the left and honly two on the right , so we have to change the cl into CL3
less concentraion = less molecules per unite volume , less molecules = less reaction , so less zinc gets used up
Helium:
--- Quote from: Raywin on June 06, 2010, 02:09:27 pm ---Guys, a silly doubt :P Whats the difference between Heat, Roast and burn in air.. ??? Thanks.
--- End quote ---
All the same......
WARRIOR:
--- Quote from: MasterMath on June 06, 2010, 02:10:10 pm ---The polymer formed by HO-CH2CH2-OH and
HOOC-C6H4-COOH shouldnt it be OC-C6H4-COO-CH2CH2-O ?
The alcohol looses H and the acid looses - OH
The MS says :
-OOC-C6H4-COOCH2CH2O- =_="
Where did the first extra O come from >_> or its just a part of the last monomer?
--- End quote ---
the alcohol jst loses an H
which paper ?
rhea:
--- Quote from: Kimo Jesus on June 06, 2010, 02:08:21 pm ---3..Ca+.2..Sc3+ --> 3...Ca2+ +.2..Sc
there has to be same maount of electrons on each side , therefore we make it 6 -->6
--- End quote ---
umm...but 2 on Sc when its valency is 3??!
i just dont get this ionic eq balancing!
mdwael:
In may/june 2003 paper 3 chemistry how do you draw the structure of the polymer? its questions 3d(ii)
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