Understanding Half-Reactions

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Amy Xiao 1I
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Joined: Sat Jul 20, 2019 12:15 am

Understanding Half-Reactions

Postby Amy Xiao 1I » Tue Feb 18, 2020 6:25 pm

Can someone explain why we use half-reactions? Dr. Lavelle said it makes it easier to understand the redox reaction as a whole but I am just more confused.

805097738
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Re: Understanding Half-Reactions

Postby 805097738 » Tue Feb 18, 2020 6:38 pm

half reactions let us understand what is happening exactly to the molecule being reduced and same for the molecule being oxidized. Each reaction on their own has energy potential measured in volts; so, by looking at both measures, we can add them together to get the energy potential as a whole. But overall half reactions are most useful for visualizing the redox process broken down in my opinion.

805097738
Posts: 180
Joined: Wed Sep 18, 2019 12:20 am

Re: Understanding Half-Reactions

Postby 805097738 » Tue Feb 18, 2020 6:38 pm

805097738 wrote:half reactions let us understand what is happening exactly to the molecule being reduced and same for the molecule being oxidized. Each reaction on their own has cell potential measured in volts; so, by looking at both measures, we can add them together to get the cell potential as a whole. But overall half reactions are most useful for visualizing the redox process broken down in my opinion.

Amy Pham 1D
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Joined: Fri Aug 09, 2019 12:15 am

Re: Understanding Half-Reactions

Postby Amy Pham 1D » Wed Feb 19, 2020 2:53 pm

We use half reactions to break down an overall reaction into two distinct portions of electron exchange: one for the oxidation reaction where electrons are being lost, and one for the reduction reaction where those electrons are being gained. In just the overall reaction we cannot see what is happening with the electrons since they cancel out on the reactant and product sides, but breaking down the equation into half reactions allows us to visualize what is happening with the electrons and charge transfer within the reaction.

Pablo 1K
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Joined: Sat Feb 02, 2019 12:15 am

Re: Understanding Half-Reactions

Postby Pablo 1K » Wed Feb 19, 2020 4:11 pm

I believe its just to help you break down the problem and measure oxidation by itself and then reduction. After, you can then combine them to continue the problem.

Jada Brown 2H
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Joined: Sat Aug 17, 2019 12:15 am

Re: Understanding Half-Reactions

Postby Jada Brown 2H » Wed Feb 19, 2020 5:16 pm

It shows you the oxidation and reduction reactions separately that are occurring together in the full redox reaction.

Kallista McCarty 1C
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Re: Understanding Half-Reactions

Postby Kallista McCarty 1C » Wed Feb 19, 2020 5:41 pm

It breaks it down so you can easily see what is being oxidized and what is being reduced!

CNourian2H
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Joined: Fri Aug 30, 2019 12:16 am

Re: Understanding Half-Reactions

Postby CNourian2H » Wed Feb 19, 2020 9:17 pm

Can you explain how to tell which is being oxidized and which is being reduced in a redox rxn?

Madelyn Romberg 1H
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Joined: Tue Oct 02, 2018 12:16 am

Re: Understanding Half-Reactions

Postby Madelyn Romberg 1H » Wed Feb 19, 2020 10:22 pm

half reactions let you balance how the oxidation and reduction is occurring, bringing in the right number of water, hydrogen, and hydroxide molecules to bring about a balanced redox reaction.

Astrid Lunde 1I
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Re: Understanding Half-Reactions

Postby Astrid Lunde 1I » Wed Feb 19, 2020 10:28 pm

It helps you separate what is being reduced and what is being oxidized in the reaction. After balancing the reduction and oxidation separately we can then add them together to make the overall balanced redox reaction. This would be a lot more difficult to do if we did not separate them first.

505306205
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Re: Understanding Half-Reactions

Postby 505306205 » Wed Feb 19, 2020 11:59 pm

The half-reactions represent the oxidation and reduction reactions. For a species to be reduced, it has to accept electrons from a species that has to be oxidized.

Viviana Velasquez
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Joined: Sat Jul 20, 2019 12:15 am

Re: Understanding Half-Reactions

Postby Viviana Velasquez » Thu Feb 20, 2020 11:21 am

The half reactions separates the oxidation and reduction that is happening in the reaction. Also it makes it a lot easier to balance if you split them up.


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