2 Half Reactions

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Samantha Rundle 3K
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Joined: Fri Sep 25, 2015 3:00 am

2 Half Reactions

Postby Samantha Rundle 3K » Sun Jan 31, 2016 5:06 pm

Dr. Lavelle said that when you are just given two half reactions to reverse the one with the smaller E value, so that the cell potential is positive, meaning electrons flow left to right. What are the effects of a reversing the half reaction with a larger E?

Thank you!

Anurag Bajjuri 1H
Posts: 10
Joined: Fri Sep 25, 2015 3:00 am

Re: 2 Half Reactions

Postby Anurag Bajjuri 1H » Sun Jan 31, 2016 6:12 pm

Reversing the half reaction with the larger E would result in the full reaction having a negative cell potential. If a reaction has a negative cell potential, it will not be spontaneous and therefore not occur naturally.

Yunna Gu
Posts: 26
Joined: Fri Sep 25, 2015 3:00 am

Re: 2 Half Reactions

Postby Yunna Gu » Mon Feb 01, 2016 11:52 am

Remember that electrons don't always flow from left to right. You can always switch the oxidation and reduction side. It's better to say that electrons flow from the reduction side to the oxidation side.

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