1 / 22

Oxidation/Reduction & Batteries

Oxidation/Reduction & Batteries. Oxidation. Combining with Oxygen – combustion Gives off energy Oxidation in the body – H 2 O and CO 2 Oxidation in an engine – above plus CO and NOx’s Degree of oxidation – CO not totally oxidized Rusting of Iron. Oxidation.

arich
Download Presentation

Oxidation/Reduction & Batteries

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Oxidation/Reduction& Batteries

  2. Oxidation • Combining with Oxygen – combustion • Gives off energy • Oxidation in the body – H2O and CO2 • Oxidation in an engine – above plus CO and NOx’s • Degree of oxidation – CO not totally oxidized • Rusting of Iron

  3. Oxidation • Gaining oxygen or loosing electrons 2Na + Br2→ 2Na+ + 2Br- → 2NaBr • Which looses electrons? • F, Cl, Br, I are common oxidizing agents • Oxidizing agents cause other substances to be oxidized

  4. Reduction • Oxidation/Reduction like Acid/Base • Always in pairs • Instead of exchanging protons, exchanging: • Electrons • Oxygen • Losing oxygen or gaining electrons • Memory table • Metal ores are oxidized metals, must be reduced

  5. Reduction • Reducing agents cause other substances to be reduced. • What are anti-oxidants?

  6. Reduction • Anti-oxidants are electron donors • Reduce potential oxidizing agents • Free radicals – unpaired electron wants another • Takes electrons – oxidizes • Vitamins A, C, and E

  7. Strengths of Redox Agents • So zinc is more active than copper • So iron is more active than copper • Is iron or zinc more active? – How do you tell? • The more active a metal is, the more it wants to be oxidized or ionized.

  8. Batteries • Based on activity of metals, etc. • Something oxidized that wants to be reduced • Something reduced that wants to be oxidized

  9. Batteries • Based on activity of metals, etc. • Something oxidized that wants to be reduced • Something reduced that wants to be oxidized • Store electricity as chemical energy • Primary batteries – cannot be recharged • Dry cells, alkaline, lithium • Secondary batteries – rechargeable • NiCad, NiMH, Lead acid, rechargeable alkaline, Lithium ion • Which is better for the environment?

  10. Lead Acid Batteries(car batteries) • During recharging the following also occurs: • Is there a danger here?

  11. H28 – C12 • 1 - 5, 8 - 10, 13 - 16, 24, 26, 27, 29, 47 - 51, 53, 54

More Related