10-28-08[lecture16]mo

10-28-08[lecture16]mo - Chem 116 notes 10.28.08 Lecture 16...

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1 Chem 116 notes 10.28.08 Lecture 16 Clarifying rate vs. rate constant *Entire rate law – must figure out k as well as exponents You can compare graphs to determine the correct form of the rate law if [H 2 O 2 ] vs. t is a straight line = zero order if ln([H 2 O 2 ]) vs. t is a straight line = first order if 1/[ H 2 O 2 ] vs. t is a straight line = second order (only one of these can be a straight line, or maybe none of them if it’s none of these orders) *Rate is first order in [H 2 O 2 ] because the ln([H 2 O 2 ]) vs. t graph is linear *Slope of linear graph = k Key points so far on Equilibrium *Q and K have common form (equation) and no units *At this point in learning chemistry we can think about the reaction progress ( x -axis) as time *Lowest entropy = whichever state is most ordered *Highest entropy = whichever state is most disordered *Reaction will take place in most disordered state * K depends on temperature, but is independent of time Most ordered Most disordered Solid Liquid Aqueous Gas Which chemicals are part of the expression of Q ? *Reaction only takes place in highest entropy phase
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10-28-08[lecture16]mo - Chem 116 notes 10.28.08 Lecture 16...

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