Hon chem ch 20 pg 655 electrochemical cells
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Hon Chem Ch 20 Pg 655 Electrochemical Cells PowerPoint PPT Presentation


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Hon Chem Ch 20 Pg 655 Electrochemical 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). Parts and Types of Batteries Pg 656-9. 1. Zinc-Carbon Dry Cell

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Hon Chem Ch 20 Pg 655 Electrochemical Cells

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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)


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


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


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)


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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