oxidation reduction reactions ch 19 p 591 n.
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Oxidation-Reduction Reactions Ch 19 p. 591. Name the five reaction types you already know. Synthesis, decomposition, combustion , single-replacement, double-replacement. Now investigate a special characteristic Transfer of electrons from one atom to another.

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oxidation reduction reactions ch 19 p 591
Oxidation-Reduction Reactions Ch 19 p. 591
  • Name the five reaction types you already know.
  • Synthesis, decomposition, combustion , single-replacement, double-replacement.

Now investigate a special characteristic

  • Transfer of electrons from one atom to another.
oxidation reduction reactions ch 19 p 5911

Oxidation-Reduction Reactions Ch 19 p. 591

Rules for assigning oxidation# in a chemical reaction

Atoms of pure substances have oxidations of zero.

Ex. Au, Fe, Ag, O2

2. Florine in compounds always -1

3. Oxygen almost always has -2 in compounds except when it is in a peroxide H2O2, when the oxygen oxidation number is -1.

4. Hydrogen has an oxidation number of +1 in all compounds containing elements that are more-electronegative than it; it has an ox# of -1 in compounds with metals.

slide9
5. In polyatomics the sum of oxidation# is equal to charge of ion.

Ex. Nitrate (NO3) -1 Nitrite (NO2) -1

Sulfate (SO4) -2 Phosphate (PO4) -3

  • In neutral compounds the sum of ox# equal zero

Ex. NaCl K2S H2O

  • Element on right stays normal Oxidation number …/esselman
slide10
1. UF6 8. HNO3
  • 2. H2SO4 9. P4O10
  • 3. ClO3- 10. HClO3
  • 4. HCl 11. N2O5
  • 5. CF4 12. GeCl2
  • 6. PCl3
  • 7. SO2
identifying oxidation reduction reacton
Identifying Oxidation & Reduction Reacton

“Moving electrons from one to another”

“The element changes oxidation number”

A substance that loses an e-

becomes more positive so it is oxidized

( rusting….batteries….combustion…..electroplating

A substance that gains an e-

becomes more negative so it is reduced

OIL RIG

slide12
OILOxidized Is Lost electron

RIGReduced Is Gained electron

“You cannot have one without the other”

For short, sometimes Chemist refer to these reactions as a “ redox reaction “.

slide13
Identifying reduction/ oxidation equations

1. assign all Oxidation numbers

2. did any numbers change

3. IF YES then Redox

  • will have both oil/rig
  • Practice sheet 19.2 ….p595…#2, #3.
slide14
Identify Reduction/Oxidation Equations
  • 1. H2 + Cl2 2HCl
  • 2. NaOH + HCl NaCl + H20
  • 3. 8HNO3 + H2S 8NO2 + 4H20 + H2SO4
  • 4. KNO3 2KNO2 + O2
slide15
H2 + CuO Cu + H2O
  • CH4 + 2O2 CO2 + 2H2O
  • 2Al + 3CuCl2 2AlCl3 + 3Cu

8. 2HgO 2Hg + O2

slide16
SnCl4 + 2FeCl2 2FeCl3 + SnCl2
  • 2NH4Cl +Ca(OH)2 2NH3 + 2H2O + CaCl2

11. 2HNO3 +3H2S 2NO + 4H2O + 3S