Chemistry Paper 4-theory- doubts =D

[knowitall10]

Aneways you guys keep Posting your doubts and ill try to solve more, I jus ♥ Chemistry...

what a liar! I'm in Riyadh..... and i know ur not gona sleep.....ufff bro, i can't believe u broke ur friendship over this cra--- ughnever mind... good night just in case ur really gonna sleep

 

[Gémeaux]

Naa.. given the time of the night, i ddnt think u'd actually mean wht u said

LOL, take it to be early morning

With the method I follow, yes I was right.

 

[knowitall10]

Aneways you guys keep Posting your doubts and ill try to solve more, I jus ♥ Chemistry...

I'm joking btw, please don't take me seriously Oh, and if ur Muslim (I'm sure u r)...Asslamu Alaykum

 

[knowitall10]

LOL, take it to be early morning

With the method I follow, yes I was right.

yeah... no one ever says "I'm wrong" anymore
I'm kiddind I swear.. i'm not being rude or anything..

 

[Gémeaux]

yeah... no one ever says "I'm wrong" anymore
I'm kiddind I swear.. i'm not being rude or anything..

Ahaha, no trust me I really do that Very often But this thing, I was very sure on it cuz we had a nice long lecture from our teacher over this.
Oh come on, I know you aren't being rude.

 

[knowitall10]

Ahaha, no trust me I really do that Very often But this thing, I was very sure on it cuz we had a nice long lecture from our teacher over this.
Oh come on, I know you aren't being rude.

Yeah... i hate being sleepy and high at the same time! that dude in Jeddah went off to bed so late- I'll tell his mom-

 

[knowitall10]

Yeah... i hate being sleepy and high at the same time! that dude in Jeddah went off to bed so late- I'll tell his mom-

God! i sound like a retarded child

 

[Gémeaux]

Yeah... i hate being sleepy and high at the same time! that dude in Jeddah went off to bed so late- I'll tell his mom-

I'll tell your mom you stay up so late, you sneaky kid!!

 

[knowitall10]

Wa alaykum salaam wr wb!
That's a great idea knowitall10 JazakAllah khair
So we need to start working asap guys.
If anyone's got short notes for any of the tough topics (like NMR, group trends as suggested above), i think we should collect them here.
And we could discuss all the hard qns inshaAllah
Hoping this thread will help us get amazing grades inshaAllah

Wa iyyaki!!!!!

 

[Gémeaux]

God! i sound like a retarded child

I'll tell your mom you stay up so late, you sneaky kid!!

Okay that is not what the examiner would ask us Let's just stay on topic

 

[knowitall10]

I get confused with the signs, too. In my book it says if the electrochemical reaction is the other way round, the sign changes. But in the papers, the sign isn't meant to change. So doubtful which one to employ, maybe there's complicated rule as to when the sign changes and when it doesn't?

Did u get it now?

 

[knowitall10]

I'll tell your mom you stay up so late, you sneaky kid!!

My amma knows... unlike someone Ariel Robert

 

[lavanyamane]

Did u get it now?

Not really

 

[xhizors]

What
What do u mean "slow reactions reagents"?

the intermediate reagants which causes slow reaction!

 

[xhizors]

Umm.. i was just reading that chem guide site... it said that the cell potential of a viable reaction must be positive. you know how we calculate the overall cell potential when two half equations are given yeah? Yeah, that's basically supposed to be positive if we want to prove that the reaction does take place...if u dont get it, do u want me to post the link? It's an important point... u might wanna c it for yourself

yup if the overall difference in two elctrodes potential is positive means reaction is possible else not possible
also a key point
when a chemical equation has a negative electrode potential it means the metal of that guy(electrode) has more tendency to loose e/s than its ions(in electrolyte) to gain e/s thats why overall potential becomes -ve
hope i haven't confuse you!

 

[xhizors]

Sorry, I still don't get you.
What you mean to say is that if we consider the equation Ag+ + e- ---> Ag, we take E°= +0.80V but when we consider Ag ---> Ag+ + e-, we take -0.80??
I seriously doubt that.

nopes sign does changes when u reversed the equation!

 

[xhizors]

And guys/gals, this is not a test or anything, but can someone please explain what's the half equation of the half cell on the left (the one with the solid sulfer deposit) and please provide me with an explanation
Thank you very much!
Jazakum Allahu Khair

Does your question resist ?

 

[knowitall10]

Assalamu Alykum!!!
Good Morning

 

[knowitall10]

Not really

Look, my friend, you can do it either way, when u reverse the signs (which happens when u reverse the equation), you simply add all of them.
Another way is, you don
t reverse the signs and then you use the {E more +ve - E less +ve}... now? do u get it?

 

[1357913579]

Assalamoalikum
for anyone confused about electrode potential (sign) see its simple just use concept instead of formulas see if u reverse the equation OBVIOUSLY sign of the electrode potential changes if you removing an electron instead of adding Will electrode potential remain same?? no
-so first see which half cell reaction has a higher potential that will gaining electron (reduction) keep its question forward with the same +potential
-now reverse the other cell equation as if one is reducing its ganing electron where does the electron come from? from the other cell which is oxidising so reverse the sign for this other question as ur reversing it equation (oxiding)
now add the 2 values as one is reducing the other is oxidising we have to see which one is more like potential provided by the oxidising of that electron is enough for the reducing process to accept that electron in order that reaction happens