Section 8.3 Classifying Reactions 1.To learn about classification schemes for reactions Objectives

Section 8.3 Classifying Reactions A. Ways to Classify Reactions –Formation of a precipitate from a solution AB (aq) + CD (aq)  AD (s) + CB (aq) Double Displacement Reactions Acid-Base Reactions − Reaction of acids and bases to give a salt plus water: HX (aq) + MOH (aq)  MX (aq) + H 2 O (l) Precipitation Reactions –Atoms swap partners

Section 8.3 Classifying Reactions A. Ways to Classify Reactions –One atom replaces another in a compound Thermite Reaction Single Replacement Reactions Equation:

Section 8.3 Classifying Reactions A. Ways to Classify Reactions In General: A + BC  B + AC Single Replacement Reactions Equation:

Section 8.3 Classifying Reactions Involve oxygen and produce energy so rapidly that a flame results B. Other Ways to Classify Reactions Combustion Reactions CH 4(g) + 2O 2(g)  CO 2(g) + 2H 2 O (g) Special class of oxidation-reduction reaction

Section 8.3 Classifying Reactions A synthesis reaction is one in which a compound forms from simpler materials (often elements) 4Fe (s) + 3O 2 (g)  2Fe 2 O 3 (s) Special class of oxidation-reduction reactions B. Other Ways to Classify Reactions Synthesis (Combination) Reactions

Section 8.3 Classifying Reactions A decomposition reaction occurs when a compound is broken down into simpler substances. 2H 2 O (l)  2H 2 (g) + O 2 (g) B. Other Ways to Classify Reactions Decomposition Reactions water hydrolysis Also a special class of oxidation-reduction reactions

Section 8.3 Classifying Reactions B. Other Ways to Classify Reactions Summary

Section 8.3 Classifying Reactions B. Other Ways to Classify Reactions Summary Copy the diagram above and write the balanced equation of an example of each of the six main reaction types (also say if your example is a single replacement or double displacement reaction) (WOC P276 Q50, 51)