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two or more substances combine to form one new substance
Exp. Na + Cl2 NaCl


When a substance breaks up into simpler substances
Exp. NaCl Na + Cl2

Single Replacement

One elemnet replaces another in a compound
Exp. NaBr + Cl2 NaCl + Br2

Double Replacement

The positive or negative ions of two compounds are switched
Exp. NaBr + Pb2S3 Na2S + PbBr3


a hydrocarbon reacts with oxygen to form carbon dioxide and water
Exp. C8H18 + O2 CO2 + H2O

Neutralization (Acid/Base RXN)

an acid and base react to form water and a salt
Exp. HCl + NaOH H2O + NaCl


Oxidation is a process in which a substance loses one or more electrons (Oxidation # increases). Reduction is a process in which a substance gains one or more electrons (Oxidation # decreases). Remember that the oxidation number of an atom by itself is 0.

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