Transcription of Chapter 14. CHEMICAL EQUILIBRIUM
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Chapter 14. CHEMICAL EQUILIBRIUM
Chapter 14 EQUILIBRIUM Notes page 1 of 6 Chapter 14. CHEMICAL EQUILIBRIUM THE CONCEPT OF EQUILIBRIUM AND THE EQUILIBRIUM CONSTANT Many CHEMICAL reactions do not go to completion but instead attain a state of CHEMICAL EQUILIBRIUM . CHEMICAL EQUILIBRIUM : A state in which the rates of the forward and reverse reactions are equal and the concentrations of the reactants and products remain constant. EQUILIBRIUM is a dynamic process the conversions of reactants to products and products to reactants are still going on, although there is no net change in the number of reactant and product molecules. For the reaction: N2O4(g) 2NO2(g) The EQUILIBRIUM Constant For a reaction: aA + bB cC + dD EQUILIBRIUM constant: Kc = badcBADC][][][][ The EQUILIBRIUM constant, Kc, is the ratio of the EQUILIBRIUM concentrations of products over the EQUILIBRIUM concentrations of reactants each raised to the power of their stoichiometric coefficients.
Exothermic (∆H < 0) R Products + Heat Recall that both K c and the position of the equilibrium system will vary with temperature: • K c is larger when the reaction shifts right. This occurs if T is increased for an Endothermic Reaction or T is decreased for an Exothermic reaction. • K c is smaller when the reaction shifts left. This ...
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