TYPES OF REACTIONS January 8, 2014

the process by which one or more substances are changed into one or more different substances Chemical Reaction

REACTANTS the starting substances in a chemical reaction (the stuff on the left)

PRODUCTS the final substances in a chemical reaction (the stuff on the right)

General Formula for Reactions A + B  C Reactants yield Products

two or more substances combine to form one new substance SYNTHESIS A + B  AB Na + Cl 2  NaCl Pb(IV) + O 2  Pb 2 O 4

Info on Synthesis Reactions Also known as “combination” reactions Always form compounds Generally give off lots of energy Can be reversed (decomposition)

when a substance breaks up into simpler substances DECOMPOSITION AB  A + B NaCl  Na + Cl 2 Pb + O 2 Pb 2 O 4 

Info on Decomp Reactions Energy is usually need to make these reactions happen Often are the cause of explosions

one element displaces another in a compound SINGLE DISPLACEMENT AB + C  AC + B or CB + A NaBr + Cl 2  NaCl + Br 2 (NH 4 ) 2 S + O 2  (NH 4 ) 2 O + S

DOUBLE DISPLACEMENT the positive or negative portions of two compounds are switched AB + CD  AD + CB NaBr + Pb 2 S 3  Na 2 S + PbBr 3 K 2 SO 4 + Ba(OH) 2  KOH + BaSO 4

hydrocarbon reacts with oxygen to form carbon dioxide and water COMBUSTION CH 4 + O 2  CO 2 + H 2 O

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