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Chemistry Help HERE ONLY !!

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hummer618:
guys there is a rumour, saying that there will be no


- Organinc chemistry,
- Reactivity Series
- moles
-Endo or Exo thermic thingys

however will be

Rates of Reactions,
Bonding
and da rest


ur welcome


i am soo bloody confident

twilight:
u will b knowing the total oxidation state of the compound ...
if its a compound .. then the oxidation state is zero
if its an ion then the oxidation state is the final charge on that ion

now suppose we take KMnO4  .. the final oxidation sate is zero .. because there is no overall charge on the compound
suppose u wanna get the oxidation number of Mn .. assume it to be x
we know that K is +1 , and O is -2 ....    this is how u do it
   (+1) + x + (-2)(4)  = 0
solve algebrically so x = 7

godfather93:

--- Quote from: twilight on May 25, 2009, 09:51:40 pm ---u will b knowing the total oxidation state of the compound ...
if its a compound .. then the oxidation state is zero
if its an ion then the oxidation state is the final charge on that ion

now suppose we take KMnO4  .. the final oxidation sate is zero .. because there is no overall charge on the compound
suppose u wanna get the oxidation number of Mn .. assume it to be x
we know that K is +1 , and O is -2 ....    this is how u do it
   (+1) + x + (-2)(4)  = 0
solve algebrically so x = 7

--- End quote ---
thank u so much 4 ur response. (+rep) i read the same method in one of the other sites and i understand very well now.
this is the site i used
http://www.chemguide.co.uk/inorganic/redox/oxidnstates.html

do u know what is the oxidation state? as in what is it meant to represent in an atom.

cockyxrocker:
hey could anyone gimme the list of water soluble and insoluble gases

nid404:

--- Quote from: cockyxrocker on May 26, 2009, 07:13:10 am ---hey could anyone gimme the list of water soluble and insoluble gases

--- End quote ---

well common ones that dissolve are

Hydrogen chloride
Hydrogen sulphide
Ammonia
Oxygen
Carbon dioxide
Nitrogen dioxide
Chlorine gas
Carbon monoxide
nitrous oxide

Actually most gases dissolve in water but have different values of solubility. But those gases are complex so I think these should be enough for our syllabus

Ill try to get a full list if possible

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