Chemistry P31

[IGCSE O/L student]

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 :/

i don't remember the question, but i wrote:
Ag+ + cl-=Agcl

 

[IGCSE O/L student]

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....

this is a cell, and the more reactive metal is the anode.
oxidation always occurs at the anode

 

[sma786]

i got 1:1.5:1 .. i forgot we had to do it like 2:3:2 .. i did 1:2:1 :'(

 

[white rose]

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....

yeah i agree with u...

 

[white rose]

i don't remember the question, but i wrote:
Ag+ + cl-=Agcl

i rote it as Ag2+ + Cl- = AgCl

 

[IGCSE O/L student]

i rote it as Ag2+ + Cl- = AgCl

but they said it was silver(I)chloride

 

[Alan Khaledi]

i got 1:1.5:1 .. i forgot we had to do it like 2:3:2 .. i did 1:2:1 :'(

its ok! dnt wry... im sure u will be fine

 

[white rose]

but they said it was silver(I)chloride

yeah but da charge for Ag is 2+

 

[Alan Khaledi]

guys!!! why is calcium carbonate better than calcium oxide???

 

[Abu mota]

no it is 1+

 

[Abu mota]

guys!!! why is calcium carbonate better than calcium oxide???

insoluble so the water will never rise above ph 7 and doesnt get washed away easily

 

[Osmix1995]

guys!!! why is calcium carbonate better than calcium oxide???

i wrote it stays for longer time , and also it will never raise the pH above 7

 

[sma786]

guys!!! why is calcium carbonate better than calcium oxide???

because calcium carbonate is insoluble in water

 

[white rose]

yeah but da charge for Ag is 2+

oh sorry...its Ag +...i got it wrong

 

[Alan Khaledi]

insoluble so the water will never rise above ph 7 and doesnt get washed away easily

yea bt calcium oxide is also insoluble

 

[L-Girl]

i got 1:1.5:1 .. i forgot we had to do it like 2:3:2 .. i did 1:2:1 :'(

i did that too :'( but it's for one mark :'(

 

[Mohamed123456789]

guys!!! why is calcium carbonate better than calcium oxide???

Calcium carbonate is insoluble so it will not dissolve in water making it alkaline

 

[white rose]

oh sorry...its Ag +...i got it wrong

how much mark ws it

 

[white rose]

Calcium carbonate is insoluble so it will not dissolve in water making it alkaline

exactly

 

[Alan Khaledi]

because calcium carbonate is insoluble in water

bt CaO is also insoluble