Chem_215_Lect_27_Color

Chem_215_Lect_27_Color - Chapter 15 Kinetics Questions How...

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1 Chapter 15: Kinetics Questions: How rapidly does a reaction proceed? How do reactions occur on the molecular scale? What variables affect the rates of reactions? Briggs-Rauscher Oscillating Reaction Reaction is complex; most important reactions are: 5H 2 O 2 + 2IO 3 - + 2H + I 2 + 5O 2 + 4H 2 0 5H 2 O 2 + I 2 2IO 3 - + 2H + + 4H 2 0 _______________________________ Overall: 2H 2 O 2 (aq) O 2 (g) + H 2 O(l)
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2 Thermal Decomposition of NO 2 2NO 2 (g) 2NO(g) + O 2 (g)
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3 Thermal Decomposition of NO 2 2NO 2 (g) 2NO(g) + O 2 (g) -4.2 x 10 -5 2.2 x 10 -5 1.4 x 10 -5 -2.8 x 10 -5 4.2 x 10 -5 2.8 x 10 -5 Ave Rate (M/ s) Ave Rate (M/s) Ave Rate (M/s)
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4 2NO 2 (g) 2NO(g) + O 2 (g) 1.4 x 10 -5 -2.8 x 10 -5 2.8 x 10 -5 Ave Rate (M/s) Ave Rate (M/s) Ave Rate (M/s) 0 0.001 0.002 0.003 0.004 0.005 0.006 0.007 0.008 0.009 0.01 0 50 100 150 200 250 300 350 400 Time (s) Conc. (M) Δ [NO 2 ] Δ t = -2.8x10 -5 M/s Average Rate Δ [O 2 ] Δ [NO] Δ t Δ t = 2.8x10 -5 M/s = 1.4x10 -5 M/s
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5 Defining Reaction Rates For the hypothetical reaction aA + bB gG + hH: [ ] [ ] [] [ ] t H h t G g t B b t A a Rate Δ Δ = Δ Δ = Δ Δ = Δ Δ = 1 1 1 1 1.4 x 10 -5 -2.8 x 10 -5 2.8 x 10 -5 Ave Rate (M/s) Ave Rate (M/s) Ave Rate (M/s) 2NO 2 (g)
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Chem_215_Lect_27_Color - Chapter 15 Kinetics Questions How...

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