Chemical Reactions

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.