Will award points for correct answers to compare to my study guide. Thanks Elect

Question

Will award points for correct answers to compare to my study guide. Thanks

Electrolysis uses current so that:

An otherwise spontaneous reaction can be sped up

A fast reaction can be slowed down or even stopped

An otherwise non-spontaneous reaction can be started

The overall yield of the otherwise spontaneous reaction can be increased

Question 18

What is the value for E

An otherwise spontaneous reaction can be sped up

A fast reaction can be slowed down or even stopped

An otherwise non-spontaneous reaction can be started

The overall yield of the otherwise spontaneous reaction can be increased

Explanation / Answer

17. The answer is:

An otherwise non-spontaneous reaction can be started

In electrolysis, a current is used to drive a non-spontanaeous reaction by providing external energy.

18. The answer is: +0.978 V

Eo(cell) = Eo(MnO4-/Mn2+) - Eo(I2/I-)

= 1.512 - 0.534 = +0.978 V

19. The answer is:

Nickel is oxidized, the cadmium ion is reduced and the oxidation step is always written on the left side of the cell notation.

Oxidation state of Ni increases from 0 to +2 => Nu is oxidized

Oxidation state of Cd decreases from +2 to 0 => Cd is reduced

Anode (oxidation) is written on left side of cell notation

20. The answer is: DGo = -nFEo

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