chapter 15 review questions ANSWERS UPDATED IV

# chapter 15 review questions ANSWERS UPDATED IV - Cl(g) acts...

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1) For the reaction 2A + B products Determine the rate law and the rate constant, given the following data: [A] [B] Initial Rate 0.10 0.10 2x10 -2 0.30 0.10 1.8x10 -1 0.20 0.20 8.0x10 -2 Rate = k[A] 2 2x10 -2 = k (.1) 2 k = 2 2) For a first order reaction k = 0.00300 s -1 at 298 K. a) Determine the time in seconds required for 75% reaction (that means that 75% of the reactant has reacted) ln(.25) = -0.003t t = 462 seconds b) If the activation energy is 35.5 kJ/mol what is the rate constant at 350 K? ln(k 2 /0.003) = -35,500/(8.314) (1/350-1/298) k 2 = 0.0252 3) What is the rate law for the following mechanism? Cl 2 (g) 2 Cl(g) K 1 , fast Cl(g) + CO(g) COCl (g) K 2 , fast COCl(g) + Cl 2 (g) COCl 2 (g) + Cl(g) k 3 , slow Rate = (K 1 ) 1/2 K 2 k 3 [Cl 2 ] 3/2 [CO] 4) For the above mechanism, is the following statement true:

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Unformatted text preview: Cl(g) acts as a catalyst. Justify your answer. Cl is an INTERMEDIATE NOT a CATALYST 5) Draw a reaction coordinate diagram (energy vs. progress of reaction) for an endothermic reaction. Label the transition state, the E for the reaction and the E a See Figure 15.10 for an exothermic reaction the only difference is that the Products should be at higher energies than the reactants 6) Explain why raising the temperature increases the rate of reaction. Use a diagram showing the distribution of energies for molecules at high and low temperatures in you answer See Figure 15.13 and the caption...
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## This test prep was uploaded on 04/20/2008 for the course CHEM 105 taught by Professor F during the Fall '05 term at Grove City.

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chapter 15 review questions ANSWERS UPDATED IV - Cl(g) acts...

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