1 .		A certain first-order reaction has a rate constant of 1.75 x 10-1 s-1 at 20°C. What is the value of k at 60°C if Ea = 121 kJ/mol? Online Text [Hint]
2 .		A certain first-order reaction has a rate constant of 2.35 x 10-2 s-1 at 25°C. What is the value of k at 5°C if Ea = 58 kJ/mol? Online Text [Hint]
3 .		In the diagram below, which measurement corresponds to the heat of reaction? Is the reaction exothermic or endothermic? [Hint]
4 .		Which line in the reaction profile corresponds to the activation energy for the forward reaction? Online Text [Hint]
5 .		In a series of reactions, which is the rate-determining step? Online Text [Hint]
6 .		Determine the molecularity and write a rate law for the following elementary reaction: NO + Cl2 --> NOCl2 Online Text [Hint]
7 .		In which of the following is the molecularity unimolecular? (i) N2O(g) + Cl(g) --> N2(g) + ClO(g) (ii) Cl2(g) --> 2Cl(g) (iii) NO(g) + Cl2(g) --> NOCl2(g) Online Text [Hint]
8 .		The following mechanism has been proposed for the reaction of NO with H2: NO + NO --> N2O2 N2O2 + H2 --> N2O + H2O If the observed rate law is rate = k[NO]2[H2], what can be concluded about the relative speeds of the first and second steps? Online Text [Hint]
9 .		Consider the following hypothetical chemical reaction: A + 2B --> E The mechanism for this reaction is a) 2A + B --> C (slow) b) B + C --> D (fast) c) D --> E + A (fast) Which one of the following is the correct rate law for this reaction? Online Text [Hint]
10 .		Why are termolecular reactions less common than uni- or bimolecular reactions? Online Text [Hint]
11 .		Which one of the following statements is incorrect? Online Text [Hint]
12 .		What part of the energy profile of a reaction is affected by a catalyst? Online Text [Hint]
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