Wednesday
August 20, 2014

Homework Help: Chemistry

Posted by Val on Sunday, March 21, 2010 at 11:49pm.

For the following electrochemical cell, what is the correct, balanced reaction?
Cu(s) | Cu2+(aq) || Ag+(aq) | Ag(s)

A. Cu(s) + Cu2+(aq) → Ag+(aq) + Ag(s)
B. Cu(s) + Ag+(aq) → Cu2+(aq) + Ag(s)
C. Cu(s) + 2 Ag+(aq) → Cu2+(aq) + 2 Ag(s)
D. Cu2+(aq) + Ag(s) → Cu(s) + Ag+(aq)

My guess is Answer D

For the following electrochemical cell, what is ΔEš?
Zn(s) | Zn2+(aq) || Cr3+(aq), Cr2+(aq) |Pt(s)

Zn2+(aq) + 2 e- → Zn(s) Eš = -0.8 V
Cr3+ (aq) + e- → Cr2+(aq) Eš = -0.4 V

A. 0.4 V
B. 0.0 V
C. -0.4 V
D. -1.2 V

I am guess it is C..but I am pretty confused about how to solve this--if someone could explain this that'd be great. I changed the sign of the 2nd half reaction so it would be an oxidation (i think..) then added...but I could really use clarification.

Which of the following reagents is most likely to function as a reducing agent?

A. F2(g) F2(g) + 2 e- → 2 F-(aq) Eš = 2.9 V
B. H2(g) 2 H+(aq) + 2 e- → H2(g) Eš = 0 V
C. Al(s) Al3+ (aq) + 3 e- → Al(s) Eš = -1.7 V
D. They are all equally likely

I am guessing it would be C because it has more negative standard reduction potential, so there will be oxidation and it will be a redcing agent? I keep getting mixed up...Thanks for any help

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