Half Reaction

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Kyra Dingle 1B
Posts: 55
Joined: Fri Sep 29, 2017 7:04 am

Half Reaction

Postby Kyra Dingle 1B » Sun Feb 18, 2018 6:56 pm

When giving a full redox reaction and asked to write either the oxidation or reduction half-reactions, can we use the elements alone with an oxidation number for each half reaction? or are we expected to utilize the full compound when writing the half reaction?

For example, in 14.1 we are asked to write the oxidation and reduction half-reactions. In the solutions manual the oxidation half reaction was written as:
C2H5OH -> C2H4O + H+ + 2e-
Does this mean this simplified form:
C2- -> C1- + e-
would not be accepted as an answer?

Tasnia Haider 1E
Posts: 55
Joined: Sat Jul 22, 2017 3:01 am

Re: Half Reaction

Postby Tasnia Haider 1E » Sun Feb 18, 2018 7:22 pm

I don't think it will because the half reactions need to be cancelled out. In the half reactions the H+ should be included and full compounds/ions.

torialmquist1F
Posts: 49
Joined: Sat Jul 22, 2017 3:00 am

Re: Half Reaction

Postby torialmquist1F » Sun Feb 18, 2018 7:26 pm

I don't think so either because in full reactions there should be no free electrons, but in half reactions the electrons and H+ molecules should be included with the compounds

Cassandra Mullen 1E
Posts: 54
Joined: Fri Sep 29, 2017 7:07 am
Been upvoted: 2 times

Re: Half Reaction

Postby Cassandra Mullen 1E » Sun Feb 18, 2018 8:14 pm

When writing half reactions, I think you only disregard the spectator ions since they don't participate in the actual redox reaction.


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