CH101 Lec11

CH101 Lec11 - Balance the following half reactions into a...

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
Balance the following half reactions into a complete redox reaction. I (s) + 2e 2I (aq) Na(s) Na (aq) + e Which half reaction is in the anode and which is in the cathode? Which species are oxidizing agents and which are reducing agents? Na /Na is in the anode Na /I are oxidizing agents 2x
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Silver gained an electron- “ reduced Copper lost electrons- “ oxidized Electron acceptor Electron donor O I L R I G xidation s oss eduction s ain CHAPTER 11- Electron Transfer and Electrochemistry Electron transfer- reactions that involve the transfer of electrons from one reactant to the other 2Ag + (aq) + Cu (s) 2Ag (s) + Cu 2+ (aq)
Background image of page 2
Section 11.1 Redox Reactions In general, electron transfer occurs spontaneously if the electrons can go to lower energy . electrons are transferred from copper to silver Electrons transfer to lower energy Cu energy If Ag(s) and Cu 2+ are mixed, no reaction occurs. Ag Ag Electrons don’t go to higher energy spontaneously
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Redox Reactions Ag + + e Ag(s) Cu(s) Cu 2+ + 2e Reduction Oxidation Half reactions +2e 2Ag + + Cu 2Ag + Cu 2+ Combine and balance half reactions to make a redox reaction: 2 × (Ag + + e Ag(s)) Cu(s) Cu 2+ + 2e 2Ag + + 2e 2Ag(s)) Cu(s) Cu 2+ + 2e + The number of electrons lost (ox) must equal  the number of electrons gained (red)
Background image of page 4
Section 11.1 Redox Reactions Ag + + e Ag(s) Cu(s) Cu 2+ + 2e Reduction Oxidation Oxidizing agent - oxidizes other substances while it becomes reduced Reducing agent - reduces other substances while it becomes oxidized Oxidizing agent Reducing agent Examples: Ag + /Ag, Cu 2+ /Cu Redox couple - the oxidized and reduced forms of a species (ox/red). oxidized form reduced form
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Balancing half reactions determine # of electrons transferred balance oxygen atoms on both sides of equation by adding H 2 O balance hydrogen atoms and total charge by adding H 1+ or OH 1- Example: Ox N =+5 Ox N =+2 Balanced half-reaction
Background image of page 6
Example: MnO 4 1- (aq) → Mn 2+ (aq) MnO 4 1- + 5e - Mn 2+ MnO 4 1- + 5e - Mn 2+ + 4H 2 O MnO 4 1- + 5e - + 8H + Mn 2+ + 4H 2 O Ox Mn = +7 Balanced half-reaction
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Section 11.2
Background image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/29/2008 for the course CH 101 taught by Professor Bigham during the Fall '08 term at N.C. State.

Page1 / 30

CH101 Lec11 - Balance the following half reactions into a...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online