Chemistry P31

[Abu mota]

and this too

ITS THE HOLIDAYS

 

[IGCSE O/L student]

Nononononono.....lol I put Fe2O3.2H20
because it was hydrous but I think Im wrong

it's correct.
that's what i did.

 

[white rose]

if u hav 2 eyes then u must have seen tht there were bubbles Around A so "A" RUSTED BUT U R ALSO CORRECT ABT "B"..............HOPE BOTH OV them ARE CORRECT.......if the reasons stated are correct !!!!!!!!!!!!!!!!!!!!!!

i rote B bcoz lose of electrons.....hope its correct

 

[IGCSE O/L student]

Guyzz i wrote it FeO2.H2O because i got the mole ratio 1:2:1 - what do u think?

my ratio was 1:1.5:1

 

[IGCSE O/L student]

it is A because even though it was a chemical cell, the positive electrode is the anode and anode is always where oxidation occurs

yes, that's what we learnt
oxidation occurs at the anode.

 

[L-Girl]

i rote B bcoz lose of electrons.....hope its correct

exactly

 

[L-Girl]

it's correct.
that's what i did.

the ratio and the formula were for 1 mark?

 

[IGCSE O/L student]

the ratio and the formula were for 1 mark?

i think they were for 2 marks.
not sure, though!

 

[Alan Khaledi]

my ratio was 1:1.5:1

ummm u shud always right whole numbers so the ratio is 2:3:2

 

[IGCSE O/L student]

ummm u shud always right whole numbers so the ratio is 2:3:2

so is my answer wrong?

 

[mahmouds]

Guyz i think it is B because of electron flow in the circuit !!!
But what about the question that ask about the measurements needed to be taken t calculate the rate of rusting ???

 

[somaya]

photochemical

substitution (photochemical)
i rote in diz way

 

[IGCSE O/L student]

Guyz i think it is B because of electron flow in the circuit !!!
But what about the question that ask about the measurements needed to be taken t calculate the rate of rusting ???

ik my answers are wrong, but this is what I wrote:
the time taken for the rusting take place.(increase in mass of the electrode)
the thickness of the electrode

 

[white rose]

Guyz i think it is B because of electron flow in the circuit !!!
But what about the question that ask about the measurements needed to be taken t calculate the rate of rusting ???

i rote time taken for reaction

 

[Alan Khaledi]

so is my answer wrong?

well probably cuz i remeber doing like u in a school exam and i got it wrong! what dd u write for the formula?

 

[mahmouds]

the ratio and the formula were for 1 mark?

Yes

 

[Abu mota]

ik my answers are wrong, but this is what I wrote:
the time taken for the rusting take place.(increase in mass of the electrode)
the thickness of the electrode

i wrote change in mass/ time taken and yes ratios shud be in whole numbers. but i want to ask u a question did it ask for state symbols in ionic formula? and do i get it wrong if i wrote 2Ag++2Cl-=2AgCl, multipled all by 2 for some reason :/

 

[IGCSE O/L student]

well probably cuz i remeber doing like u in a school exam and i got it wrong! what dd u write for the formula?

Fe2O3.2H2O

 

[EpicLol]

Here is what the question said....
The electrolye was like Fe(III) something......

The electrodes were of iron, and there was a pipe of oxygen at the anode.....
I put B and I was sure, but now Im confused....coz oxidation is loss of electons and the electrons are being lost at the cathode in this situation.....but its anode that is oxidised when its like a metal and like a non metal, here they are both metals(Iron) so oxidation could occur at both electrodes, and since the flow is from B to A it should be B....

 

[Abu mota]

r

Fe2O3.2H2O

RIGHT