Lecture notes for Wednesday Nov 28 Chem135 Johnson

Lecture notes for Wednesday Nov 28 Chem135 Johnson -...

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Lecture notes for Wednesday, Nov 28 for Exam V Dr. Johnson CHEM135 Acid-Base Equilibrium Chemical Kinetics Chemistry dealing with rates of reaction Car speed measures distance traveled/unit time Reaction rate measures change in concentration/unit time Slow rusting Fast combustion Reactants products A B t B t A rate + = - = ] [ ] [ Methods for determining rates: Instantaneous rate Average rate Most useful: Initial instaneous rate 2A B t B t A rate + = - = ] [ 2 ] [ Generically: aA + bB cC + dD t d D t c C t b B t a A rate + = + = - = - = ] [ ] [ ] [ ] [
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Depletion of ozone 2 O 3 3 O 2 t O t O rate + = - = 3 ] [ 2 ] [ 2 3 There are a number of ways to measure reaction rates, two examples: Follow the change in the color of a solution: Bromine dissolved in water is brown whereas the ion is colorless: Br 2 (aq) + HCOOH 2 H + (aq) + 2 Br - (aq) + CO 2 (g) For gas producing reactions, measure the amount of gas formed by determining
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Lecture notes for Wednesday Nov 28 Chem135 Johnson -...

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