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
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

slide6

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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