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APChem KineticsWSkey

# APChem KineticsWSkey - AP Chemistry Chemical Kinetics...

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AP Chemistry Chemical Kinetics Worksheet Answers 1. Half lives Reactant Fraction Remaining 1 ½ 2 ¼ 3 1/8 4 1/16 5 1/32 2. 2 nd Order; 1 st Order 3. a. True b. True c. False; As [Reactant] decreases the rate will decrease d. True 4. a. -1/2 Δ [O 3 ]/ Δ t = 1/3 Δ [O 2 ]/ Δ t b. -1/2 Δ [HOF]/ Δ t = 1/2 Δ [HF]/ Δ t = Δ [O 2 ]/ Δ t c. - Δ [N 2 ]/ Δ t = -1/3 Δ [H 2 ] / Δ t = 1/2 Δ [NH 3 ]/ Δ t 5. a. rate = k[NO 2 ] 2 [CO] 0 or k[NO 2 ] 2 b. rate = 1/4 the original value 6. The initial rate R = k[B] o 2 7. a. 6.0x10 -3 / 1.2x10 -2 = (0.10/0.20) X X = 1 so it is 1 st order with respect to A 1.1x10 -1 / 1.2x10 -2 = (0.15/0.05) X X = 2 so it is 2 nd order with respect to B Rate Law = k[A][B] 2 b. Overall it is 3 rd order c. Probably not a single step since a 3-body collision would have to occur. 8. a. half life = ln (1/2) = -5.0x10 -4 s -1 t -ln (0.5) / 5.0x10 -4 s -1 = 1.4x10 3 s b. Assign an original value of 1.00M ln(0.1/1.0) = -5.0x10 -4 s -1 t t = -ln(0.1)/5.0x10 -4 s -1 = 4.6x10 3 s 9. After 30.min (one half-life) P HOF = ½ (100.mmHg) = 50.mmHg P HF = 50.mmHg P O2 = 25.mmHg Calculating the rate constant k, ln ([HOF]/[HOF] o ) = -kt ln(0.5) = -k (30.min)

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k = 0.023min -1 ln X = -(0.023min -1 )(45min) = 0.35 or 35%
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APChem KineticsWSkey - AP Chemistry Chemical Kinetics...

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