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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.

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Chapter 19 Oxidation-Reduction Reactions Pg. 595

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  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 Pg 655Electrochemical Cells • AKA batteries • Pg 643 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 BatteriesPg 656-9 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 a. smaller, AA and AAA, cameras, remotes b. Zn and KOH instead of Zn and C • Hg Batteries a. tiny, hearing aids, watches b. Zn, KOH, Steel, HgO

  7. Corrosion and PreventionPg 661-2 • Fe is oxidized, loses electrons, forms rust • Salt and acid speed up the oxidation • Zn coating prevents oxidation due to Pg 643, called galvanizing • Electric potential difference = volts (how hard electricity pushes thru wire)

  8. Recharging BatteriesPg 667-9 • 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) • 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 Pg 669**do redoxrxn for car battery

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