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Ch. 16 - Chemical Reactions. III. Types of Reactions. A. Synthesis. the combination of 2 or more substances to form a compound only one product forms. A + B A B. 2P + 3Br 2 2PBr 3. B. Decomposition. a compound breaks down into 2 or more simpler substances only one reactant.
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Ch. 16 - Chemical Reactions III. Types of Reactions
A. Synthesis • the combination of 2 or more substances to form a compound • only one product forms A+ BAB 2P + 3Br2 2PBr3
B. Decomposition • a compound breaks down into 2 or more simpler substances • only one reactant ABA+B 2H2O2 2H2O + O2
C. Single Replacement • one element replaces another in a compound • metal replaces metal (+) • nonmetal replaces nonmetal (-) A +BCAC+B Zn + 2HCl ZnCl2 + H2
D. Double Replacement • ions in two compounds “change partners” • cation(+) of one compound combines with anion(-) of the other AB +CDAD +CB 2KOH + CuSO4 K2SO4 + Cu(OH)2
E. Combustion • the burning of a substance in O2 to produce heat • hydrocarbons (CxHy) always form CO2 and H2O CxHy+O2 CO2+H2O CH4 + 2O2 CO2 + 2H2O