Chemistry by OpenStax (2015-05-04)
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ISBN: 9781938168390
Author: Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Publisher: OpenStax
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Chapter 12, Problem 83E
For each of the following reaction diagrams, estimate the activation energy (Ea) of the reaction:
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Chapter 12 Solutions
Chemistry by OpenStax (2015-05-04)
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- . Account for the increase in reaction rate brought about by a catalyst.arrow_forwardWhat is the role of the activated complex in a chemical reaction?arrow_forwardSubstances that poison a catalyst pose a major concern for many engineering designs, including those for catalytic converters. One design option is to add materials that react with potential poisons before they reach the catalyst. Among the commonly encountered catalyst poisons are silicon and phosphorus, which typically form phosphate or silicate ions in the oxidizing environment of an engine. Group 2 elements are added to the catalyst to react with these contaminants before they reach the working portion of the catalytic converter. If estimates show that a catalytic converter will be exposed to 625 g of silicon during its lifetime, what mass of beryllium would need to be included in the design?arrow_forward
- How do chemists envision reactions taking place in terms of the collision model for reactions? Give an example of a simple reaction and how you might envision the reaction’s taking place by means of a collision between the molecules.arrow_forwardConsider the following activation energy diagram. Which of the following statements about the diagram are true? (a) E a(forward)E a(reverse)(b) B represents the activation energy of the forward reaction. (c) Energy (H)for the reaction is AC. (d) E a(forward)=BA(e) E a(forward)=E a(reverse)Carrow_forwardHow is it possible for a catalyst to give products from a reaction mixture that are different from those obtained when no catalyst or a different catalyst is used? Give an example.arrow_forward
- Account for the relationship between the rate of a reaction and its activation energy.arrow_forwardConsider a reaction in which E a=129 kJ and H=29 kJ. In the presence of a catalyst, the activation energy is 48% of the uncatalyzed reaction. Follow the directions in Question 71 in drawing an energy diagram.arrow_forwardIf a textbook defined a catalyst as "a substance that increases the rate of a reaction," would that definition be adequate?arrow_forward
- A reaction takes place between an acid and 0.5grams of solid magnesium ribbon. Another reaction takes place between an acid and 0.5grams of powdered magnesium. Which statement is true? a.The powdered magnesium reacts faster because the activation energy has been lowered. b.The magnesium strip reacts faster because it has a higher concentration of magnesium. c.The powdered magnesium reacts faster because it has a greater surface area. d.The magnesium strip reacts faster because it will create a higher temperature once the reaction starts.arrow_forwardIs a system at equilibrium if the rate constants of the forward and reverse reactions are equal?arrow_forwardClassify each of the following statements as true or false. aSome equilibria depend on a steady supply of a reactant in order to maintain the equilibrium. bBoth forward and reverse reactions continue after equilibrium is reached. cEvery time reactant molecules collide, there is a reaction. dPotential energy during a collision is greater than potential energy before or after the collision. eThe properties of a transition state are between those of the reactants and products. fActivation energy is positive for both the forward and reverse reactions. gKinetic energy is changed to potential energy during a collision. hAn increase in temperature speeds the forward reaction but slows the reverse reaction. iA catalyst changes the steps by which a reaction is completed. jAn increase in concentration of a substance on the right-hand side of an equation speeds the reverse reaction rate. kAn increase in the concentration of a substance in an equilibrium increases the reaction rate in which the substance is a product. lReducing the volume of a gaseous equilibrium shifts the equilibrium in the direction of fewer gaseous molecules. mRaising temperature results in a shift in the forward direction of an endothermic equilibrium. nThe value of an equilibrium constant depends on temperature. oA large K indicates that an equilibrium is favored in the reverse direction.arrow_forward
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