LEO says GER
Loss of Electons Oxidation Gain of Electrons Reduction
Assigning Oxidation Numbers
Always Oxidation Numbers
-elementary state = 0 [H2(g) H=0)
-alkali metal ion = +1 [Na of NaCl; Na = +1]
-alkaliine earth metal ion = +2 [Ca of CaCl2; Ca = +2]
-flourine ion = -1 [F of NaF; F=-1]
Usually Oxidation Numbers
-hydrogen = +1 [except in hydrides, NaH, where H is -1]
-oxygen = -2 [except in peroxides, H202 where O is -1]
Workout everything else
-the sum of all oxidation numbers must equal the total charrge
(if no charge is indicated then the total charge is zero)
example: Na3PO4 Na = +1 (alkali metal) O = -2 (oxygen is usually -2)
3(Na) + P + 4(O) = 0
3(+1) +P + 4(-2) = 0
P= +5
example NO3 1- (nitrate ion)
N + 3(O) = -1
N + 3(-2) = -1 [oxygen usually -2]
N = +5
OIL RIG
From the Oxidation Number lesson:
p659 (12-16)
p662 (19)
In honour of LEO (GER!!!!!!!!!), the following:
Why do Lions eat raw meat? [Because they don't know how to cook.] Why did the lion loose at the card game? [Because he was playing with a cheetah.]
A lion spots a monkey walking through the jungle. He grabs him by the neck and roars "Who's the king of the jungle?” The frightened monkey says, "You are, of course, your majesty." The lion does this to several other animals, with the same results. Then the lion goes up to an elephant, grabs him by the trunk and roars, "Who's the king of the jungle?" The elephant picks the lion up with his trunk, bounces him a few times on the ground, grabs his tail, twirls the lion around over his head, and then lets him go flying into a mud puddle. The lion looks up at the elephant and says, "Well, if you don't know the answer, just say so!”
A couple of zoologists decided to give a lion a cell phone in order to keep track of his whereabouts. Unfortunately, whenever they tried to call, the lion was busy!
A hungry lion was roaming through the jungle looking for something to eat. He came across two men. One was sitting under a tree and reading a book the other was typing away on his typewriter. The lion quickly pounced on the man reading the book and devoured him. Even the king of the jungle knows that readers digest and writers cramp.
[Lion jokes from : http://mojolion.com/Lion_Jokes.html]
