Chemistry Unit 4 - Kinetics

Chemistry Unit 4 - Kinetics - Chemical Kinetics (p. 56-61)...

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Chemical Kinetics (p. 56-61) Homogeneous reactions – occur within a single phase (i.e. gas, liquid or solid) Heterogeneous reactions – occur at interfaces between phases time) area)(unit surface (unit species chemical of mass ime) me)(unit t (unit volu species chemical of mass = = rate rate
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Reaction Order Reaction order describes the number of concentration terms in the rate expression (Table 2-4 from D&M)
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Homogeneous First-Order Rates kt t A e A A kt A A dt k A A d A k dt A d r rate - = - = - = - = = = 0 0 0 [A] [A] ] [ ] [ ] [ ] [ ln ] [ ] [ time of function a as ion concentrat determine to reaction decay for ] [ ] [ 0
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Half-Life • t 1/2 is defined as the time required for the concentration to decay to half its original value k k t kt e A A kt 693 . 0 5 . 0 ln 5 . 0 ln 5 . 0 ] [ ] [ 2 / 1 2 / 1 0 2 / 1 = - = - = = = -
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Example An underground storage tank has been leaking for many years. The groundwater concentration beneath the site is 0.30 mg/L. The contaminant moves 0.5 ft/day, but
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Chemistry Unit 4 - Kinetics - Chemical Kinetics (p. 56-61)...

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