Katie Bart 1I
Posts: 104
Joined: Sat Aug 24, 2019 12:16 am

In a redox reaction, how do you know how many electrons to add to each part of the reaction? And how do you know which side of the equation to add them on?

Esha Chawla 2E
Posts: 108
Joined: Thu Jul 25, 2019 12:17 am

Katie Bart 1I wrote:In a redox reaction, how do you know how many electrons to add to each part of the reaction? And how do you know which side of the equation to add them on?

Add electrons to the side of the equation with the greater positive charge. To determine how many electrons to add to each part of the reaction, calculate the overall charge of each side of the reaction. Subtract the overall charge from one side from the other side's overall charge. This difference represents how many electrons you should add to the side of the equation with the greater positive charge.

Ryan Chang 1C
Posts: 105
Joined: Sat Aug 24, 2019 12:17 am

The charge on both sides of the reaction need to be balanced, so add electrons to whichever side has a higher charge.

chrisleung-2J
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Once you determine the side electrons must go on for one of the half rxns, you can know to place the electrons on the opposite side of the other half rxn equation since the electrons must cancel as the equations are added.

Marni Kahn 1A
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You add electrons to the reactant side of reduction reactions because that substance is gaining electrons. Conversely, you add electrons to the product side of oxidation reactions since that substance is losing electrons.

Megan Kirschner
Posts: 46
Joined: Wed Feb 20, 2019 12:17 am

It's always good to start by determining how many electrons to add to each part of the reaction by calculating the overall charge of each side of the reaction.

BCaballero_4F
Posts: 94
Joined: Wed Nov 14, 2018 12:22 am

You add it on the side with the higher charge, and you add based on however much is needed for it to be balanced.

205405339
Posts: 77
Joined: Thu Jul 11, 2019 12:16 am

you add electrons to the side with the more positive charge to balance the charge on both sides of the equation

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