Chapter+16 - Chemistry Chapter 16: Kinetics: Rates and...

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Click to edit Master subtitle style 6/6/11 Chemistry Chapter 16: Kinetics: Rates and Mechanisms of Chemical Reactions Dr. Shamindri M. Arachchige arachsm@vt.edu Davidson 11 11 Office Hours: Help Session Location: Davidson 11 Location: MCB 100 Monday 9:30-10:30 AM Monday 6:50-7:50 PM Tuesday 3:30-5:30 PM Wednesday 2:00-4:00 PM Other hours by appointment
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6/6/11 Chapter 16: Kinetics: Rates and Mechanisms of Chemical Reactions Kinetics - The wide range of reaction rates. 22
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6/6/11 C [B] C t 33 Chapter 16: Kinetics: Rates and Mechanisms of Chemical Reactions Expressing the Reaction Rate reaction rate - changes in the concentrations of reactants or products over time reactant concentrations decrease while product concentrations increase Rate of reaction = - for A B change in concentration of A change in time = - conc A2 - conc A1 t 2 - t 1 C [A] - C t Rate of reaction =
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6/6/11 - C [C2H4] C t 44 Chapter 16: Kinetics: Rates and Mechanisms of Chemical Reactions The concentration of O3 vs. time during its reaction with C2H4. C 2 H 4 ( g ) + O 3 ( g ) C 2 H 4 O( g ) + O 2 ( g ) rate = - C [O3] C t =
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6/6/11 55 Chapter 16: Kinetics: Rates and Mechanisms of Chemical Reactions Figure 16.6 Plots of [C2H4] and [O2] vs. time.
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6/6/11 66 Chapter 16: Kinetics: Rates and Mechanisms of Chemical Reactions Reaction Rate - 2N 2 O 5 (g) 4NO 2 (g) + O 2 (g) Concentration vs. Time 0.00 0.04 0.08 0.12 0.16 0.20 0.24 0.28 0.32 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 Time (min) [N2O5] (M) [NO2] (M)
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6/6/11 77 Chapter 16: Kinetics: Rates and Mechanisms of Chemical Reactions N 2 O 5 : NO 2 : O 2 :
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6/6/11 88 Chapter 16: Kinetics: Rates and Mechanisms of Chemical Reactions Example Problem : For the reaction above, N 2 O 5 is being consumed at a rate of 0.68 M/s. At what rates are NO 2 and O 2 being produced? In general, for the reaction aA + bB cC + dD rate = 1 a - = - [A] t 1 b [B] t 1 c [C] t = + 1 d [D] t = +
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6/6/11 99 Chapter 16: Kinetics: Rates and Mechanisms of Chemical Reactions Example problem NO (g) + O2 (g) N2O3 (g) How fast is [O2] decreasing when [NO] is decreasing at a rate of 1.60 x 10-4 mol/L.s ?
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6/6/11 1010 Chapter 16: Kinetics: Rates and Mechanisms of Chemical Reactions Plotting Rate vs. Concentration
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6/6/11 1111 Chapter 16: Kinetics:
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Chapter+16 - Chemistry Chapter 16: Kinetics: Rates and...

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