General Chemistry - Chemical Kinetics
6 important questions on General Chemistry - Chemical Kinetics
Experimental determination of rate law
Trial 1: [A] = 1 [B] = 1 r = 2
Trial 2: [A] = 1 [B] = 2 r=8.1
Trial 3: [A] = 2 [B] = 2 r=15.9
r2/r1 = (k (1^x)(2^y)) / (k(1^x)(1^y)) = 8.1/2
= 2^y = 4, y = 2
r3/r2 = (k(2^x)(2^y))/(k(1^x)(2^y)) = 15.9/8.1
= 2^x 2, x=1
r = k [A][B]^2
2 = k[1][1]^2, k = 2
r = 2[A][B]^2
Zero order reaction
rate = k
[A] = [A0] - k(t)
halflife: = 1/2 (A0 / k)
1st order reactions
rate = k[A] or k[B]
[At] = [A0] * e ^(-kt)
halflife = ln2 / k = 0.693/k
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2nd order reactions
rate = k[A]^2, k[B]^2 or k[A][B]
Mixed order reaction
Draw a potential energy diagram, label the activation energy, enthalpy change, heats of reaction, relative energies. show an exothermic and an endothermic reaction
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