CHEM 1B Kinetics (Rate Rxn & Laws) Lecture
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8 Terms
Which has the fastest rate?
Which has the slowest rate?
2A +B —> 3C
3C = fastest; highest # = fastest
B= slowest; lowest #= slowest
*Overall rxn can NOT go faster than B; B is the slowest molecule & rxn
what does △[A] indicate in this:
A —> B
△[A]= change in concentration of reactant over time period △t
*note: reactants are rate= - △\[A] /△ t because [A] decreases with time.
What is a reaction rate?
Reaction rate is the change in concentration of a reactant or a product with time (M/s)
What does rate= -1/2 △[A]/△t mean in the equation below?
2A —> B
It means that two moles of A disappear for each mole of B formed. Since the overall rxn can NOT go faster than the slowest molecule rxn rate, the overall reaction rxn rate of A will disappear ½ slower to match the speed of the production of B.
What is the rate law?
Rate law shows dependence of reaction rate on concentration of each reactant.
Interpret this rate law : Rate=k[A]x [B]y
reaction is xth order in A
reaction is yth order in B
reaction is (x+y)th order overall
Do zero order reactants change the rate?
NO, zero order reactants do NOT change the rate.