{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

CHEM 1360 CHS 8-9 - Oxidation-Reduction Reactions...

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

View Full Document Right Arrow Icon
Oxidation-Reduction Reactions Oxidation-Reduction Reactions OXIDATION = loss of electrons Examples: Na Na + + e - Al Al 3+ + 3e - S 2- S + 2e - OXIDATION = increasing the oxidation number (more positive) Example: NO NO 2 -2 +2 -2 +4 change = +2 +2 to +4 : N is oxidized LEO the lion goes GER Oxid. Nos:
Background image of page 1

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

View Full Document Right Arrow Icon
Oxidation-Reduction Reactions Oxidation-Reduction Reactions REDUCTION = gain of electrons Examples: N + 3e - N 3- Fe 3+ +e - Fe 2+ REDUCTION = decreasing the oxidation number (more negative) Example: MnO 4 - Mn 2+ Oxid. Nos: +7 +2 change = -5 +7 to +2 : Mn is reduced LEO the lion goes GER
Background image of page 2
Voltaic Cells Voltaic Cells (a porous barrier can be used instead of salt bridge)
Background image of page 3

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

View Full Document Right Arrow Icon
Choose any two entries; the top one will act as the cathode and will be reduced; the bottom one will act as the anode and will be oxidized. This electromotive series presents data showing the tendency of substances to gain or lose electrons. The standard voltage will be the algebraic difference between the two respective potentials. 0.46 V
Background image of page 4
Batteries Batteries Batteries are the most practical applications of voltaic cell. All batteries have self contained anode/cathode compartments. All operate using the same principles already discussed. The Classic “dry” (LeClanché) cell. carbon cathode zinc anode Mushy paste Of MnO 2 and NH 4 Cl Overall reaction : Zn + 2 MnO 2 + 2NH 4 + Zn 2+ +2MnO(OH)+ 2NH 3 E~1.5 v.
Background image of page 5

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

View Full Document Right Arrow Icon
Batteries Batteries
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}