Chapter 19 oxidation reduction reactions pg 595
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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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Chapter 19 oxidation reduction reactions pg 595

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)


Oxidation reduction reaction

Oxidation-Reduction Reaction

  • Also called-Redox

  • Transfer of electrons

  • One cannot happen without the other.

    Oxidation Reduction

    IsIs

    LosingGaining

    Oxidation #increases Oxidation # decreases


Remember oil rig

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


Hon chem ch 20 pg 617 electrochemical cells

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)


Parts and types of batteries pg 618 22

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


Chapter 19 oxidation reduction reactions pg 595

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


Corrosion and prevention pg 623 24

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)


Recharging batteries pg 629 31

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


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