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Ch. 8 – Chemical Reactions Types of Chemical Reactions I II III IV V Describing Chemical Reactions Evidence of a chemical change… Production of heat and light Formation of a gas Formation of a precipitate, a solid product. Color change Describing Chemical Reactions A+B AB REACTANTS PRODUCTS Describing Chemical Reactions A. Combination / Synthesis (marriage) the combination of 2 or more substances to form a compound only one product A + B AB A. Combination / Synthesis Product: Must be a compound Mg(s) + O2(g) MgO(s) B. Decomposition (divorce) a compound breaks down into 2 or more simpler substances only one reactant AB A + B B. Decomposition Products: Can be elements or compounds H2O2 (aq) H2O(l) + O2(g) C. Single Replacement (affair) one element replaces another in a compound Metal replaces metal Nonmetal replaces nonmetal A + BC B + AC C. Single Replacement Zn(s) + HCl(aq) H2(g) + ZnCl2(aq) D. Double Replacement (Jerry Springer) ions in two compounds “change partners” cation of one compound combines with anion of the other AB + CD AD + CB D. Double Replacement Products: Are compounds Sometimes one of the products is water Pb(NO3)2(aq)+ NaI(aq) PbI2(s)+ NaNO3(aq) E. Combustion the burning of a hydrocarbon to produce heat CxHy + O2 CO2 + H2O E. Combustion Products: During complete combustion the products are CO2 + H2O C12H22O11 + 3O2 9C + 3CO2 + H2O Warm up (practice) Title: Reaction Types Number Page (1-5) 1. 2. 3. 4. 5. 1. Single Replacement Cu(s) + 2AgNO3(aq) Cu(NO3)2(aq) + 2Ag(s) 2. Decomposition 2 H2O(l) 2 H2(g) + O2(g) 3. Combination / Synthesis H2(g) + Cl2(g) 2 HCl(g) 4. Double Replacement Pb(NO3)2(aq) + K2CrO4(aq) PbCrO4(s) + 2KNO3(aq) 5. Combustion C2H6 + O2 CO2 + H2O