1 / 14

Oxidation-Reduction Reactions “ Redox ”

Oxidation-Reduction Reactions “ Redox ”. LEO SAYS GER. Oxidation and Reduction ( Redox ). Electrons are transferred. Spontaneous redox rxns can transfer energy Electrons (electricity) Heat. Non-spontaneous redox rxns can be made to happen with electricity.

ansel
Download Presentation

Oxidation-Reduction Reactions “ Redox ”

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 Reactions“Redox” LEO SAYS GER

  2. Oxidation and Reduction (Redox) • Electrons are transferred • Spontaneous redoxrxns can transfer energy • Electrons (electricity) • Heat • Non-spontaneous redoxrxns can be made to happen with electricity

  3. Oxidation Reduction Reactions(Redox) Each sodium atom loses one electron: Each chlorine atom gains one electron:

  4. LEO says GER : Lose Electrons = Oxidation Sodium is oxidized Gain Electrons = Reduction Chlorine is reduced

  5. Not All Reactions are Redox Reactions Reactions in which there has been no change in oxidation number are not redoxrxns. Examples:

  6. Rules for Assigning Oxidation NumbersRules 1 & 2 • The oxidation number of any uncombined element is zero 2. The oxidation number of a monatomic ion equals its charge

  7. Rules for Assigning Oxidation NumbersRules 3 & 4 3.The oxidation number of oxygen in compounds is -2 4. The oxidation number of hydrogen in compounds is +1

  8. Rules for Assigning Oxidation Number Rule 5 5. The sum of the oxidation numbers in the formula of a compound is 0 2(+1) + (-2) = 0 H O (+2) + 2(-2) + 2(+1) = 0 Ca O H

  9. Rules for Assigning Oxidation NumbersRule 6 6. The sum of the oxidation numbers in the formula of a polyatomic ion is equal to its charge X + 4(-2) = -2 S O X + 3(-2) = -1 N O  X = +5  X = +6

  10. The Oxidation Number Rules - SIMPLIFIED 1. The sum of the oxidation numbers in ANYTHING is equal to its charge 2. Hydrogen in compounds is +1 3. Oxygen in compounds is -2

  11. Reducing Agents and Oxidizing Agents • The substance reduced is the oxidizingagent • The substance oxidized is the reducingagent Sodium is oxidized – it is the reducing agent Chlorine is reduced – it is the oxidizing agent

  12. Trends in Oxidation and Reduction • Active metals: • Lose electrons easily • Are easily oxidized • Are strong reducing agents • Active nonmetals: • Gain electrons easily • Are easily reduced • Are strong oxidizing agents

  13. Redox Reaction Prediction #1

  14. Redox Reaction Prediction #2

More Related