chemistry paper 61 need help exam in couple of hours!!

[Osmix1995]

guys the question about electrolysis my friend said he had this question where they asked him " why does anode takes more time to give gas than cathode" my reaction was X_X !!!!!!
can someone explain why this happens?

and also there are questions where they bring you 2 experiments A and B and then they ask why does test tube B cracks but A does not??

any idea of possible reasons??

 

[pudge919]

guys the question about electrolysis my friend said he had this question where they asked him " why does anode takes more time to give gas than cathode" my reaction was X_X !!!!!!
can someone explain why this happens?

and also there are questions where they bring you 2 experiments A and B and then they ask why does test tube B cracks but A does not??

any idea of possible reasons??

because some of the gas is dissolved in the solution thats why it takes longer time to be evolved ~~

 

[Osmix1995]

are you sure someone told me that "Positive metal ions are denser than non metals ions So it takes alonger time to reach the anode"

 

[pudge919]

I'm sure man , check the mark scheme and tell me if i'm wrong so that we can both benefit btw when is youm exam ?

 

[Osmix1995]

it is not on mark scheme it is 2012

 

[pudge919]

there's a similar question in October november 2008 Q 2 c
it says why bubbles of gas were not seen immediatley on the anode , the answer is : the gas is dissolved in the solution
that's all what i know man , hope that it helped you !

 

[Lujain M.]

which variant is this ?

 

[Osmix1995]

variant 2

 

[Lujain M.]

oh I'm taking variant 1

 

[coolmanhashi]

i think that one of the experiment might have a delivery tube involved so due to suck back which can cause the test tube to crack!!!!!!

 

[basharelli]

what also came ?

 

[Silver Wing]

Which paper was it