i dun get oxidation/reduction in half equations (1 Viewer)

[kooltrainer]

i no oxidation is loss of electron and reduction is gain.. how do u classify which half equation is oxidation or reduction?

e.g.1 (Mg2+) +( 2e-) ---------->> Mg this is reduction

e.g.2 (Mg) -------->> Mg(2+) + (2e-) this is oxidation..


in the first example, Mg2+ gained 2 electrons so thats "reduction" but the second one also gained...
??????????????????????????????????

i dun get it.. how do u classify which half equation is reduction/oxidation..
thx

 

[Forbidden.]

i no oxidation is loss of electron and reduction is gain.. how do u classify which half equation is oxidation or reduction?

e.g.1 (Mg2+) +( 2e-) ---------->> Mg this is reduction

e.g.2 (Mg) -------->> Mg(2+) + (2e-) this is oxidation..


in the first example, Mg2+ gained 2 electrons so thats "reduction" but the second one also gained...
??????????????????????????????????

i dun get it.. how do u classify which half equation is reduction/oxidation..
thx

In your second example, two electrons have separated from the magnesium.
On the left hand side you have elemental Magnesium.
On the right hand side you have a doubly ionised magnesium with two FREE electrons.
There should be a less active element/compound that has caused Magnesium to oxidise.

In a redox (reduction-oxidation) reaction you must have a reaction that oxidises and one that reduces you can't have one without the other.

Oxidation Is the Loss of electrons (OIL) OR Gaining of oxygen.
Reduction Is the Gain of electrons (RIG) OR Loss of oxygen.

From left-hand side to right hand side.

 

[kooltrainer]

thanks , i get it now.. btw, u happen to no why boredofstudies website is so slow in loading pages? or is it just me.

 

[brenton1987]

u happen to no why boredofstudies website is so slow in loading pages?

I guess its the pre-HSC cram.