chapter 15 review questions ANSWERS UPDATED III

chapter 15 review questions ANSWERS UPDATED III - 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 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 ΔE 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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chapter 15 review questions ANSWERS UPDATED III - Cl(g acts...

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