More on Oxidation States

[m0ck1ngj4y]

maybe i'll actually pass chemistry now..

[lykranian]

At 8:45 the H2O2 would have a total charge of -2, right? 1(2) + -2(2) = -2.

[lykranian]

@lykranian 8:24 oops

[MrStevenAddink]

@lykranian The Oxide atoms react with one another therefore they both 'lose' an electron. Eventually both of the oxide atoms will have a charge of -1 making the total charge 1(2) + -1(2) = 0

[scanadith]

like this if you slept in your class when they taught this and you are wide awake when you are watching this

[scanadith]

khanacademy is the best

[Mslivecode]

When he is talking about Fe2(CO3)3 how doe she know that the oxidation state of C is +4

[XDsylwek]

@Mslivecode because if C's valency



[lykranian]

@Mslivecode He mentions it in the video. Carbon can be either +4 or -4, depending if it is bonded with elements on the right or left of it.

[itouch286]

You're so much better than my teacher! Thank you so much!

[Avatarass]

+4-3(-2) = 10 isnt it?

[FruitarianSwimster]

@Avatarass He meant to put 4 + 3(-2) = -2 at 12:08, since you add the oxidation states of each atom.

[lykranian]

@Avatarass it should be +4 + 3(-2). Sal got the + and - confused.

[wooferpoofer]

Teeeheee, he draws a penis at 10:03...

[0O00OO0O00OO0O00OO]

Sal, I love you, you are win. Screw any pop icon, YOU are win. You teach me and thousands/millions of others what a teacher or a textbook cannot. It seems only YOU know how to connect to the rest of us. Thank you thank you thank you

[Sshirazi84]

Scrap that stupid comment.

[Sshirazi84]

I don't understand the oxidation states in h20 aqueous solution... Any help?

[Sabimaruxxx]

All carbons are created equal

[mariomaruf]

towards the end, carbons don't have a big enough electronegativity difference with hydrogen to create partial charges right?

[bookworm260194]

Isn't the oxidation state supposed to be +2 or -2 and the charge 2- or 2+?

[FIrefartable]

@bookworm260194 the oxidation state is actually supposed to be written with roman letters/numbers e.g. +IV

[ChiefLinesider07]

08:32 -4 net oxidation state??? positive 2 for hydrogen -4 for oxygens= -2 Net charge

[snipessssss]

how come in Mg(OH)2, the oxidation state of oxygen is -2, but in H20 it is also -2?

There are a different number of hydrogen atoms in the two different molecules, but the oxidation state of oxygen remains the same. why?

[SteelDetailer]

@snipessssss : The hydroxide group (OH) is still hungry for an electron. That is why it takes 2 hydroxides to balance one Mg atom.

[Pink8Flamingo]

sexy voice & well explained for a german, too :-)

[shadow0690]

im kinda new to this so im not sure if im right but in the acetic acid shouldn't the oxidation numbers for C be -4 for the left side and +4 on the right since there is a bond between them. Please let me know if im wrong or missing something

[v24094]

"All carbons are created equal"

WIN.

[Sabimaruxxx]

@v24094 LOL. This guy is citing the DOI.  LOLOLOL

[thewhatever379only]

@v24094 actually not necessarily true. Isotopes. LOL~ anyway i like it

[rinwhr]

12:18 wait shouldn't it be +4 + 6??

[alex49carson]

@rinwhr no, the final is correct, but the original should be

+4+6(-2)

[drstingrae]

Hypothetically defined:

Exactly what is a Oxidation Jock

[AgOrganic]

The magnesium hydroxide:

Mg+2 becuase it gives up 2 electrons

H+1 is bonded to the O, so it had to give up 1 electron

O-2 because it gains 2 electrons

2 at end of equation because there are 2 OH and the one OH is -1, therefore making the OH -2 and Mg +2 is cancelled out ??

[AgOrganic]

Way too complicated!!

Mg+2(O-2H+1)2  ??

[MattCikra]

thank you so much

[miinibee]

so how come the Carbon to Carbon bond in Acetate doesn't count?

[djswizzair]

8.41 is also wrong it would end up as a minus 2 total oxidation state ... 2 * +1 = 2 + 2*(-2) = -4 makes totally -2 not to confuse u =)

[LordAlda]

Also, at 12:08 it should be +4 + 3(-2) = -2.

But that probably isn't important.

[sultanthewise]

hydrogen peroxide at 10.05, why oxygen is positive, it suppose to be negative because it takes electron form hydrogen, am i not????

[khanacademy]

You are correct. My brain must have heard itself say "gaining" and put +1 there. I've added annotations to correct. Will also make a follow-on video to make sure people are not confused.