1 / 8

Chapter 19 Oxidation-Reduction Reactions Pg. 595

Chapter 19 Oxidation-Reduction Reactions Pg. 595. Oxidation- valence electrons are lost Reduction- valence electrons are gained Rules for determining the oxidation number of an element (pg. 595) Practice assigning Oxidation numbers (pg. 612 #7 a-j) (pg.612 #6). Oxidation-Reduction Reaction.

lin
Télécharger la présentation

Chapter 19 Oxidation-Reduction Reactions Pg. 595

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. Chapter 19Oxidation-Reduction Reactions Pg. 595 • Oxidation- valence electrons are lost • Reduction- valence electrons are gained • Rules for determining the oxidation number of an element (pg. 595) • Practice assigning Oxidation numbers (pg. 612 #7 a-j) (pg.612 #6)

  2. Oxidation-Reduction Reaction • Also called-Redox • Transfer of electrons • One cannot happen without the other. Oxidation Reduction IsIs LosingGaining Oxidation #increases Oxidation # decreases

  3. Remember:Oil Rig • Determine Oxidation or Reduction • (pg. 612 #4) • Pg. 599 #3 a. is an example. Try b-e on your own for practice. • Practice Pg. 605 #1 • Pg. 612 #2 a-i,3,5 a-c,17 a-e,18

  4. Hon Chem Ch 20 Pg617Electrochemical Cells • AKA batteries • Pg607 Zn is good reducing agent (gets oxidized, loses electrons, ox# goes up) • Cu is good oxidizing agent (gets reduced, gains electrons, ox# goes down)

  5. Parts and Types of BatteriesPg618-22 1. Zinc-Carbon Dry Cell a. big, used in flashlights, C and D batteries b. Zn container – anode, negative, becomes + as loses electron c. C rod in center – cathode, + bump on end of battery, becomes negative as gains electrons

  6. 2. Alkaline Batteries – Pg 621 a. smaller, AA and AAA, cameras, remotes b. Zn and KOH instead of Zn and C • Hg Batteries – Pg 622 a. tiny, hearing aids, watches b. Zn, KOH, Steel, HgO

  7. Corrosion and PreventionPg623-24 • Fe is oxidized, loses electrons, forms rust • Salt and acid speed up the oxidation • Zn coating prevents oxidation due to Pg607, called galvanizing • Electric potential difference = volts (how hard electricity pushes thru wire)

  8. Recharging BatteriesPg629-31 • Voltaic cell – battery making electricity, anode gives electrons to cathode • Electrolytic cell – battery when being recharged, storing electricity, direct current source forces cathode to give electrons back to anode • DC sources - wall charger with diode to change AC to DC, car alternator, other battery (jumping a car) AC – alternating currect, flows back & forth, generators, walls. DC – direct current, flows in one direction, batteries • Can be recharged as long as enough products to act as reactants to reverse reaction, corrosion is loss of products/reactants so can’t recharge after corroded

More Related