chem confusion :( anode cathode galvanic cells grrrrrr

[physics]

SO if u use chem heinemann 3+4
on chptr 27 about cells and batteries pg 436 at the bottom they say anode is (-) and cathode (+) yeh i get this but then on
 chpt 28 electrolysis pg 454 they say cathode is  (-) and anode (+)

is this a typo or is there a reason why they did this?



AND for the galvanic cell
why is it that for the salt bridge the anions (-) move towards the anode (-) that undergo oxidation .. i don't get why the -ve anode would be attracted to the -ve side instead of the +ve side cathode ?


and is it correct that at the cathode reduction occurs and at the anode oxidation occurs? AN OIL RIG CAT =D

  :'(thanks in advanced

[Studyinghard]

SO if u use chem heinemann 3+4
on chptr 27 about cells and batteries pg 436 at the bottom they say anode is (-) and cathode (+) yeh i get this but then on
 chpt 28 electrolysis pg 454 they say cathode is  (-) and anode (+)

is this a typo or is there a reason why they did this?



AND for the galvanic cell
why is it that for the salt bridge the anions (-) move towards the anode (-) that undergo oxidation .. i don't get why the -ve anode would be attracted to the -ve side instead of the +ve side cathode ?


and is it correct that at the cathode reduction occurs and at the anode reduction occurs? or is it the other way around  .

  :'(thanks in advanced

Well im definitely sure that Anode = oxidation and cathode = reduction. AN OIL RIG CAT which im sure you know off.


So that on page 454 looks like a typo. (im looking at it right now)

For the galvanic cell I think it is like this.
The anode is negative hence the solution the anode is will be positive yes? and so to balance out the positive the anions from the salt bridge go into the positive solution to balance it.

Can someone confirm?

[stonecold]

^ that is correct.  anions from the salt bridge flow to the anode, and cations from the salt bride flow to the cathode.

[physics]

SO if u use chem heinemann 3+4
on chptr 27 about cells and batteries pg 436 at the bottom they say anode is (-) and cathode (+) yeh i get this but then on
 chpt 28 electrolysis pg 454 they say cathode is  (-) and anode (+)

is this a typo or is there a reason why they did this?



AND for the galvanic cell
why is it that for the salt bridge the anions (-) move towards the anode (-) that undergo oxidation .. i don't get why the -ve anode would be attracted to the -ve side instead of the +ve side cathode ?


and is it correct that at the cathode reduction occurs and at the anode reduction occurs? or is it the other way around  .

  :'(thanks in advanced

Well im definitely sure that Anode = oxidation and cathode = reduction. AN OIL RIG CAT which im sure you know off.


So that on page 454 looks like a typo. (im looking at it right now)

For the galvanic cell I think it is like this.
The anode is negative hence the solution the anode is will be positive yes? and so to balance out the positive the anions from the salt bridge go into the positive solution to balance it.

Can someone confirm?

i thought cations were +ve and anions -ve?

[Studyinghard]

SO if u use chem heinemann 3+4
on chptr 27 about cells and batteries pg 436 at the bottom they say anode is (-) and cathode (+) yeh i get this but then on
 chpt 28 electrolysis pg 454 they say cathode is  (-) and anode (+)

is this a typo or is there a reason why they did this?



AND for the galvanic cell
why is it that for the salt bridge the anions (-) move towards the anode (-) that undergo oxidation .. i don't get why the -ve anode would be attracted to the -ve side instead of the +ve side cathode ?


and is it correct that at the cathode reduction occurs and at the anode reduction occurs? or is it the other way around  .

  :'(thanks in advanced

Well im definitely sure that Anode = oxidation and cathode = reduction. AN OIL RIG CAT which im sure you know off.


So that on page 454 looks like a typo. (im looking at it right now)

For the galvanic cell I think it is like this.
The anode is negative hence the solution the anode is will be positive yes? and so to balance out the positive the anions from the salt bridge go into the positive solution to balance it.

Can someone confirm?

i thought cations were +ve and anions -ve?

Yeah cations are +ve and anions are -ve.

But in the salt bridge the anions (-ve) will go to the positive solution. Now it will go to the anode because the anode is negative. If the anode is negative the solution HAS to be positive. Remember, the salt bridge isnt connected to the anode but the solution the anode is in which is positive. So to balance out the positive charges the anions (-ve) go to the positive solution.

[stonecold]

The Cathode is (+) and the Anode is (-).

Because of this, the solutions in each of the half cells will obviously be the opposite charge right.
So the solution around the Cathode is (-) and the solution around the Anode is (+)

Therefore to maintain a balance of charges in each of the half cells, positively charged cations flow towards the Cathode (because the negatively charged solution attracts positive ions), and negatively charged anions flow towards the Anode (because the positively charged solution will attract negative ions).

Hopefully now it is a bit clearer.

[physics]

The Cathode is (+) and the Anode is (-).

Because of this, the solutions in each of the half cells will obviously be tho opposite charge right.
So the solution around the Cathode is (-) and the solution are the Anode is (+)

Therefore to maintain a balance of charges in each of the half cells, positively charged cations flow towards the Cathode (because the negatively charged solution attracts positive ions), and negatively charged anions flow towards the Anode (because the positively charged solution will attract negative ions).

Hopefully now it is a bit clearer.

ooooooooooooooo~~~ so the block of thing dipped in the solution is cathode and anode and the solution its dipped in is  the opposite right? i think i get it if u put it that wys

[kyzoo]

I was confused at anodes and cathodes too, I thought anode = (-) and cathode = (+), then I was confounded when I saw it was the other way round for electrolytic cells.

Then I looked at the dictionary, and it helped. Apparantly the anode is the electrode by which electrons enter the circuit, and the cathode receives electrons from the anode. Seems to apply to Physics as well, although it gets a bit confusing for a photoelectric circuit.

[stonecold]

It depends on what metals you are using.  you have to refer to the ECS (Electro-chemical Series) to see which is the cathode and which is the anode

In the following example, Zinc is the Anode because electrons always flow from the Anode to the Cathode.
http://www.humboldt.edu/~rap1/ChemSupp/gifs-jpgs/GalvCel.jpg

[physics]

I was confused at anodes and cathodes too, I thought anode = (-) and cathode = (+), then I was confounded when I saw it was the other way round for electrolytic cells.

Then I looked at the dictionary, and it helped. Apparantly the anode is the electrode by which electrons enter the circuit, and the cathode receives electrons from the anode. Seems to apply to Physics as well, although it gets a bit confusing for a photoelectric circuit.

oh b/c cathode undergoes oxidation losing electrons to the anode which undegoes reduction and gains electrons. i get it .
so for electrolyisis its the opposite can u explain why!?

[kyzoo]

Because the electrons flow in the opposite direction in electrolysis. If I can remember correctly, electrons are pumped out of the anode (+) and into the cathode (-).

Think of it does way, A comes before C, A --> C. Electrons go from A to C.

[stonecold]

i haven't done unit 4 yet, but is everything reversed because gold is the most electronegative element?

(or platinum to be exact, but that is reeeeeaaaalllllly expensive lol)

[xD_aQt]

Anna, have you finished the course already?!

[kyzoo]

0.o what does gold and platinum have to do with anything?

It's reversed because the electron flow is reversed.

And I think fluorine is the most electronegative element lol.

[stonecold]

haha i will just shut up until i've read it lol