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CHEM AND BIO HELP AND TIPS HERE

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Raywin:

--- Quote from: rhea on June 06, 2010, 05:47:16 pm ---what tyoe of diagram do you draw when they ask for structural formula..
and wwhen is the other (one with branches and stuff) drawn?

--- End quote ---

You can draw either, like the CH3-CH2 thingi or the other full stucture showing all the bond one as well, its all up to you. :) I draw both just in case.. ;)

rhea:
also there are questions on "observe"

now we dont know colours of ALL compounds..

any tips to tackle this?

also is Nitrogen oxide and sulphur dioxide- colour?

and...

how does a nitrate decompose?

Raywin:

--- Quote from: rhea on June 06, 2010, 05:55:52 pm ---also there are questions on "observe"

now we dont know colours of ALL compounds..

any tips to tackle this?

also is Nitrogen oxide and sulphur dioxide- colour?

and...

how does a nitrate decompose?

--- End quote ---

Umm, im guessing they will only give the Qs according to the syllabus.. they wont ask you anything out of the syllabus.

And, well, Most of the Nitrates decompose like this: 2Zn(No3)2 ---> 2ZnO + 4No2 + O2

BUT, Na and K decompose differently:
2KNo3 ---> 2KNo2 +O2  
Na decomposes in a similar way..
:) Hope tht clears ur doubt.. :D

WARRIOR:

--- Quote from: rhea on June 06, 2010, 05:55:52 pm ---also there are questions on "observe"

now we dont know colours of ALL compounds..

any tips to tackle this?

also is Nitrogen oxide and sulphur dioxide- colour?

and...

how does a nitrate decompose?

--- End quote ---
well , for compound su jst have to learn by heart

Nitrogen DIOXIDE is brown fumes

im not sure about sulfure dioxide  but whn u burn sulfur in air it produces blue flame


group 1 nitrates  ( EXCPT LITHIUM ) form EX: NANO3 --> NANO2 + 02 ( A NITRITE AND OXGYEN ) <---THIS IS NOT BALANCED

GROUP 2 + LI + TRANS METALS FORM  EX l ZnNo3 ---> ZnO + nitrogen dixode + oxygen <---this is nto balancd

Dana:

--- Quote from: MasterMath on June 06, 2010, 05:42:11 pm ---what rayoon said :D

--- End quote ---
shukkraaaan (thank you :P)

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