Chemistry P31

[WhizAly]

Sometimes they may accept it,Hope they do.
And both were vanadium i guess.

 

[L-Girl]

yeah, that's the question!

vanadium was the oxidant

 

[L-Girl]

Sometimes they may accept it,Hope they do.

sometimes they never write any oxidation states

 

[IGCSE O/L student]

then dicrhromate is equal to chromate (VI) i guess
because (VI) means that the valency electrons are 6, so its valency is 2 and that's why di is in chromate
hope u get it and hope im right

i really hope so!

 

[Razo513]

why did i write electrode A for a logical reason for rust u need water & air .. air is 21% oxygen & if u have noticed under electrode A there is a direct supply of oxygen & there surrounding water therefore electrode A will rust more .. then it will fall off (get thinner)

 

[L-Girl]

WOW it's been a day and we're still discussing

 

[IGCSE O/L student]

vanadium was the oxidant

i marked vanadium, and then i cut it and marked zinc, like an assssss!!!!!!!

 

[IGCSE O/L student]

why did i write electrode A for a logical reason for rust u need water & air .. air is 21% oxygen & if u have noticed under electrode A there is a direct supply of oxygen & there surrounding water therefore electrode A will rust more .. then it will fall off (get thinner)

that's the reason i put A tttoooo.

 

[L-Girl]

i marked vanadium, and then i cut it and marked zinc, like an assssss!!!!!!!

that's ok, it's only for 1 mark

 

[L-Girl]

what was the electron distribution?

 

[IGCSE O/L student]

that's ok, it's only for 1 mark

but that mark counts too!

 

[L-Girl]

but that mark counts too!

just make it up in paper 1

 

[IGCSE O/L student]

just make it up in paper 1

i'll try!
please pray for me!

 

[L-Girl]

i'll try!
please pray for me!

good luck!
inshallah you'll do great

 

[IGCSE O/L student]

good luck!
inshallah you'll do great

thanks and same to you, sista!
Aameen!

 

[L-Girl]

thanks and same to you, sista!
Aameen!

thanks ameen

 

[salvatore]

I wrote that too r u sure abt it? :/

100%.. *High five*

 

[L-Girl]

100%.. *High five*

what was the question?

 

[IGCSE O/L student]

what was the question?

and the answer??

 

[WhizAly]

why did i write electrode A for a logical reason for rust u need water & air .. air is 21% oxygen & if u have noticed under electrode A there is a direct supply of oxygen & there surrounding water therefore electrode A will rust more .. then it will fall off (get thinner)

Again,that question..The question was exactly like this

In both cases,electrolysis and cell,the cathode is where a REDCUTION reaction takes place and anode is where oxidation takes place.
In case of electrolysis,the anode is positive and cathode is negative.
The opposite occurs in a cell,where the more reactive metal loses electrons so it the negative pole and therefore ANODE.
Here there were no metals but the electrons flow was clearly shown,and the question stated
"Which electrode will be oxidized and decrease in mass"
Electrode B,Loses electrons ,dissolve in the solution as ions and its mass decreases(This actually ressembles electroplating where the ANODE loses electrons and change into ions.
While Electrode A,also decreases in mass but due to reaction with oxygen..This electrons compensate those lost in the reaction with oxygen which is A REDOX REACTION.