GEOL 250 Lecture Notes - Lecture 15: Chemical Kinetics, Equilibrium Thermodynamics, Collision Theory
23 Apr 2020
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Most elements have isotopes some decay. 99 tc t 1/2 = 5. 7 10 3 yr to date fossils t 1/2 = 4. 468 10 9 yr to date rocks t 1/2 = 6 hours as tracer in medicine. Chemicals needs to break bonds or structures. Main driver of reactions = collisions of atoms or molecules. Rxn rate # of collisions / time. If a is doubled, # of a-b collisions double. Speed at which reactants are converted into products during a reaction. Rate = - [a] / t. Rate may be proportional to concentration or time. Rates determined experimentally aa + bb cc + dd. Reaction rates of a & b identical. Reaction rate [a] & [b] (conc. ) Reaction order for a is its exponent (1) Reaction order for b is its exponent (1) Reaction order for reaction is all exponents added (2) Rate is written for reactants only (convention) Exponents of all reactants are 0 in expression below:
