VIII Kinetics - X Kinetics What is Kinetics Study of the...

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X Kinetics
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What is Kinetics? Study of the rate and mechanism of a chemical reaction Rate is how fast the reaction goes Mechanism is what path the reaction takes Rate = changein[] changeintime = [] t = d [] dt
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A B [ ] time [B] [A] d[A] dt = [A] f - [A] i t f - t i =- d[B] dt = [B] f - [B] i t f - t i = + So, to equate the two values, need to look at the inverse Rate of disappearance of A =- d [ A ] dt Rate of appearance of B = + d [ B ] dt
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Factors that can effect the rate of a reaction 1. Nature of the reactants Ag + + Cl - AgCl (fast) Mg +2 + CO 3 -2 MgCO 3 (slow) 2. Concentration of reactants 3. Temperature 4. Catalyst 5. Nature of the solvent 6. Particle Size
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Writing and Relating Rate Expressions Rate expressions are specific to a reaction CH 4 (g) + 2 O 2 (g) CO 2 (g) + 2 H 2 O(g) Rate = d[X] dt = M t = mol Lt Rate of disappearance of CH 4 = - d[CH 4 ] dt Rate of disappearance of O 2 = - d[O 2 ] dt Rate of appearance of CO 2 = d[CO 2 ] dt Rate of appearance of H 2 O = d[H 2 O] dt
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So, we can write a rate expression based on any reactant or product. But, how are they related? If we look at the reaction: CH 4 (g) + 2 O 2 (g) CO 2 (g) + 2 H 2 O(g) We see from the stoichiometry that O 2 reacts twice as much as CH 4 . So, it disappears twice as fast.
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