Chapter-20-1 (1)

Chapter-20-1 (1) - 1 CHAPTER 20 ELECTROCHEMISTRY • redox...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 1 CHAPTER 20 ELECTROCHEMISTRY • redox reactions, electrochemical cells • standard reduction potential (Eº red ) spontaneous redox reactions • Nernst equation ( Gº and Eº cell ) • batteries, corrosion, electrolysis 2 Electrochemical cells • redox reaction = electron transfer Mg + 2 HCl(aq) MgCl 2 (aq) + H 2 Mg Mg 2+ + 2e- oxidation 2e- + 2 H + H 2 reduction Cu 2+ (aq) + Zn Cu + Zn 2+ (aq) Lab #2 evidence for electron transfer ? 3 electron transfer in redox reactions 4 • electrochemical cell = separation of the two redox half-reactions Zn + CuSO 4 (aq) ZnSO 4 (aq) + Cu anode oxidation Zn Zn 2+ +2e- cathode reduction Cu 2+ +2e- Cu Zn Cu ZnSO 4 (aq) CuSO 4 (aq) porous separator e- e- 5 weight loss weight gain NO 3- voltage = electromotive force (emf) Fig. 20-3 6 • cell diagram anode half-cell || cathode half-cell Zn(s) | ZnSO 4 (aq) || CuSO 4 (aq) | Cu(s) difference of electric potential between electrodes = driving force for e- transfer ( electromotive force, emf ) = cell potential 7...
View Full Document

This note was uploaded on 12/14/2010 for the course CHEM 1e03 taught by Professor Jb during the Winter '10 term at Macalester.

Page1 / 19

Chapter-20-1 (1) - 1 CHAPTER 20 ELECTROCHEMISTRY • redox...

This preview shows document pages 1 - 7. Sign up to view the full document.

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