L27-Chemical_Dynamics

L27-Chemical_Dynamics - Part IV: Chemical Dynamics Chemical...

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Unformatted text preview: Part IV: Chemical Dynamics Chemical Equilibria 1 What is Equilibrium? When two opposing chemical reactions happen simultaneously and at the same rate CO 2 ( g ) + H 2 O ( l ) HCO 3 ! ( aq ) + H + ( aq ) rate for = rate rev k for k rev 2 Chemical Equilibrium CO 2 ( g ) + H 2 O ( l ) HCO 3 ! ( aq ) + H + ( aq ) ! At some point in time, the concentrations of reactants and products wont change any more aA + bB ! cC + dD appearance of C and D disappearance of C and D 3 An Example: Exp. 1 2 SO 2 ( g ) + O 2 ( g ) ! 2 SO 3 ( g ) initial conc. (M) 0.400 0.200 0.344 0.172 0.056 equil. conc. (M) 4 An Example: Exp. 2 2 SO 2 ( g ) + O 2 ( g ) ! 2 SO 3 ( g ) initial conc. (M) 0.500 0.424 0.212 0.076 equil. conc. (M) 5 k for k rev = [ SO 3 ] 2 [ SO 2 ] 2 [ O 2 ] Comparing Experiments rate for = rate rev 2 SO 2 ( g ) + O 2 ( g ) ! 2 SO 3 ( g ) rate for = k for [ SO 2 ] 2 [ O 2 ] rate rev = k rev [ SO 3 ] 2 k for [ SO 2 ] 2 [ O 2 ] = k rev [ SO 3 ] 2 6 Comparing Experiments Compound Exp.1 Exp. 2 SO...
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L27-Chemical_Dynamics - Part IV: Chemical Dynamics Chemical...

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