How is your preperation for Chem Unit 2 ???

[Shoggaine]

My exam is tomorrow and i am really worried about it :/

 

[xIshtar]

My exam is tomorrow and i am really worried about it :/

Just read through notes and solve papers, and hopefully everything will be okay.
You can only do your best with the limited papers we have

 

[Shoggaine]

Yea i am doin all da papers. What have you done for redox ???

 

[Evolution]

lets put some notes in here and share them.

 

[xIshtar]

Yea i am doin all da papers. What have you done for redox ???

Uhh, disproportionation

And just finding oxidation numbers, and thus identifying the processes that are happening

 

[helpmee]

ppl is C-H bond polar C-Cl and C-Br are they polar?? and how do u know whether thay are polar or not ? why H2O has a higher melting point than NH3?? thanx in advance

 

[schoolation]

H20 makes two hydrogen bonds, while NH3 makes only one, so stronger hydrogen bonds in water need high energy to overcome

 

[U stalking ME]

ppl is C-H bond polar C-Cl and C-Br are they polar?? and how do u know whether thay are polar or not ? why H2O has a higher melting point than NH3?? thanx in advance

All these C-H, C-Cl and C-Br are polar bonds.
A compound is considered polar if the vector sum of its constituent covalent bonds is realatively large. Normally, one would say one compound is more polar than another compound by comparing their respective vector sums. In the case of CBr4, each bond is polar, but the vector sum of the 4 dipoles is zero. Any compound whose vector sum is zero is non-polar.The polarity of a compound also depends on the electonegaitvity differences.

 

[helpmee]

met2aked ya zalameh? C-H polar w thanx for explaining

 

[U stalking ME]

met2aked ya zalameh? C-H polar w thanx for explaining

yea C-H is polar ur welcome

 

[helpmee]

scumbag wikipedia

 

[z3r0thunder]

Read some Revision Notes, solve Past Papers from 2008-2012

 

[Shoggaine]

Der was dis notes i found ovr here in one of da threads.....des notes r very useful.

 

[Evolution]

Der was dis notes i found ovr here in one of da threads.....des notes r very useful.

add the link here please

 

[Shoggaine]

add the link here please

Found it
http://www.xtremepapers.com/community/threads/as-chem-unit-2-notes-for-help.12401/

 

[Shoggaine]

I hav a question...
Why do we used Sulphuric acid with potassium dichromate to oxidize alcohols??

 

[z3r0thunder]

Because Acidic Conditions are needed to Oxidise Alcohols.

 

[étudiante]

I hav a question...
Why do we used Sulphuric acid with potassium dichromate to oxidize alcohols??

H+ ions are needed if u see the redox equation.

 

[schoolation]

Speaking of equations!
The exam is hours away, and I DON'T KNOW TILL NOW , HOW TO BALANCE AN IONIC EQUATION

 

[Shoggaine]

H+ ions are needed if u see the redox equation.

Dats it??? Aur toh kuch nahi nah?