Test 2 Question 8

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Katelyn 2E
Posts: 35
Joined: Sat Jul 22, 2017 3:01 am

Test 2 Question 8

Postby Katelyn 2E » Tue Mar 13, 2018 11:32 pm

Hi!
For the electrochemistry test (which I took Wednesday in Dane's section), how do you tell what the value of n, the number of electrons exchanged is? And also what is the balanced equation for this question?
Thank you!

Qining Jin 1F
Posts: 53
Joined: Fri Sep 29, 2017 7:07 am

Re: Test 2 Question 8

Postby Qining Jin 1F » Wed Mar 14, 2018 12:43 am

I think for #8 they already gave you the balanced equation. If they didn't then you have to balance it using the steps for balancing redox equations.

To find the number of electrons exchanged, you can look at the charges on both side of the equation. If you see any discrepancies between the charges on either side of the equation, add electrons to the equation (like if the reactants is more positive than the products, then you can balance out the charge difference by adding electrons to the reactants). The amount of electrons you add should be the number of electrons exchanged.

soniatripathy
Posts: 50
Joined: Thu Jul 13, 2017 3:00 am

Re: Test 2 Question 8

Postby soniatripathy » Wed Mar 14, 2018 3:45 pm

you will need to balance the half reactions and see the number of electrons exchanged. This is the number after you multiply both equations to have the same amount of electrons exchanged.


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