Term Test 2

PowerPoint Presentation

AnswerQUESTION 27

A catalyst decreases the activation energy of a given reaction by exactly 17 kJ/mol. By what factor does the reaction rate increase at25oC when the catalyst is used? Assume that theArrhenius pre-exponential factor, A, is the samefor the catalyzed and uncatalyzed reactions.

Reaction MechanismsSection 2.9QUESTION SECTION

90START OVERQUESTION 27 ANSWER

First, lets suppose the uncatalyzed activation energy is x, thus the catalyzed activation energy is x-17.Reaction MechanismsSection 2.8QUESTION SECTION

Factors Affecting the Rate of Chemical ReactionsNext SlideThe Fifth and Final Factor which effects the Rate of Reaction is the PHYSICAL STATE OF THE REACTANTS.

The physical state of reactants can largely effect the rate of a reaction because it effects whether or not a sufficient amount of reactants can react. Suppose you are trying to burn a log of wood, the combustion of the organic compound will only react on the surface, because the center of the log isnt it contact with oxygen and fire which is required for this reaction. Thus, the SURFACE AREA of reactants will effect the rate of reaction.

Also, a compound in AQUEOUS form allows for movement of the compound in a reaction. Thus, if reactants are dissolved in solution, the rate of reaction will increase.

Section 2.1PHYSICAL STATE OF THE REACTANTS

AnswerQUESTION 13

The chemical equation describing the decomposition of Dinitrogen Pentoxide is:

The reaction is first-order and the rate constant is k = .0682 min. If 1.00 mol of dinitrogen pentoxide is placed in a 2.00L reaction vessel at 352C, then how long will it take for 25% of the dinitrogen pentoxide to react?

Integrate Rate LawSection 2.4QUESTION SECTION