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Download Chapter 14, Section 1, pages 494-501
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Chapter 14, Section 1, pages 494-501 Reversible Reactions and Chemical Equilibrium Objectives To contrast reactions. To describe chemical equilibrium To give examples of chemical equilibrium Demo Burn sulfur in oxygen as an example of a completion reaction. Input Completion Reactions and Reversible Reactions What does reversible mean? Completion Reactions are reactions that use up all or almost all of the reactants to form products S8 + 8O2 ----------->8 SO2 Reversible Reactions are those in which some of the products will reform into reactants CaCl2 + Na2SO4 <----> CaSO4 + NaCl Equilibrium-a leaky boat being bailed at the same rate the water is coming in A chemical equilibrium is a state of balance between the forward and reverse reactions. The concentration of products and reactants remains unchanged. H2 + I2 <--------------> 2HI See fig. 3, pg. 498 Chemical Equilibria Are Dynamic (Leaky boat) Demo-pg. 500 Static equilibrium is a state when nothing changes. Example, when a ball bounces it will eventually come to rest and stay that way. Dynamic Equilibrium is when the overall reaction shows no net change but there is a constant change between reactants and products Reactants <--------------> Products A Complex Ion is any metal atom or ion that bonds with more than one atom or molecule. This forms a Ligand. Conclusion Review key concepts Homework Prepare for quiz tomorrow