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CHEM AND BIO HELP AND TIPS HERE

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MasterMath:

--- Quote from: Ari Ben Canaan on June 06, 2010, 01:30:12 pm ---You are not making sense; please be more precise.

--- End quote ---
When they ask for Structural formula ...Which one do you draw/write .. The one with ALL THE BONDS or in this form CH3-CH2-CH2..etc
This is what i mean by all bonds
    H  H
H-C -C-H or do we write it in this form CH3-CH3 or its the same  ::)
   H   H

CatAly$t:

--- Quote from: Ivo on June 06, 2010, 11:56:34 am ---i) 8/64=0.125

ii) 14.2/71=0.2

iii) SO2 (The one which isn't in excess is the one with the least no. of moles)

iv) 0.125 (We use moles of limiting reagent)

v) 0.125*135=16.9g

--- End quote ---

thx...

so the one with most moles means it's excess??always?

and the fourth one i still dont get it.... :'(

elemis:

--- Quote from: MasterMath on June 06, 2010, 01:34:13 pm ---When they ask for Structural formula ...Which one do you draw/write .. The one with ALL THE BONDS or in this form CH3-CH2-CH2..etc
This is what i mean by all bonds
    H  H
H-C -C-H or do we write it in this form CH3-CH3 or its the same  ::)
   H   H

--- End quote ---

Actually, I am not sure :P When they you give a big space I draw the displayed formula AND write the condensed one (CH3-CH3)

MasterMath:

--- Quote from: Ari Ben Canaan on June 06, 2010, 01:41:18 pm ---Actually, I am not sure :P When they you give a big space I draw the displayed formula AND write the condensed one (CH3-CH3)



--- End quote ---
mmkkay and can you look at my other question about the polymer , thanks!

blackberry:
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?

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