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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Now investigate a special characteristic
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.
Ex. Nitrate (NO3) -1 Nitrite (NO2) -1
Sulfate (SO4) -2 Phosphate (PO4) -3
Ex. NaCl K2S H2O
“Moving electrons from one to another”
“The element changes oxidation number”
A substance that loses an e-
becomes more positive so it is oxidized
A substance that gains an e-
becomes more negative so it is reduced
RIGReduced Is Gained electron
“You cannot have one without the other”
For short, sometimes Chemist refer to these reactions as a “ redox reaction “.
1. assign all Oxidation numbers
2. did any numbers change
3. IF YES then Redox
8. 2HgO 2Hg + O2
11. 2HNO3 +3H2S 2NO + 4H2O + 3S