Typical Chemical Potential Energy (PE) Diagram for an Exothermic ReactionA catalyst provides an alternatepathway for a reaction to occur. Thealternate pathway has a loweractivation energy (AE), meaning thatthe reactant molecules do not need tocollide with as much energy in orderfor a reaction to occur, so morecollisions result in a reaction, so thereaction rate is faster.ChemicalPotentialEnergy(Enthalpy)Note that adding a catalystdoes not change the amountof energy released (AH) forthe reaction.Activation Energy (AE)with a catalystPE of ReactantsAHPE of ProductsRxn ProgressWhat effect does a catalyst have on the stoichiometry of the reaction?What effect does the catalyst have on the mechanism of a reaction?AE wlo a catalyst

The stoichiometry of the reaction does not change because when a catalyst is present in the reaction…

A catalyst provides an alternate pathway for a reaction to occur. The alternate pathway has a lower activation energy (AE), meaning that the reactant molecules do not need to Chemical Potential collide with as much energy in order for a reaction to occur, so more collisions result in a reaction, so the Energy (Enthalpy) reaction rate is faster. Activation Energy (AE) with a catalyst Note that adding a catalyst does not change the amount of energy released (AH) for the reaction. PE of Reactants AH.. PE of Products Rxn Progress What effect does a catalyst have on the stoichiometry of the reaction? What effect does the catalyst have on the mechanism of a reaction? AE wlo a catalyfst

A catalyst provides an alternate pathway for a reaction to occur. The alternate pathway has a lower activation energy (AE), meaning that the reactant molecules do not need to Chemical Potential collide with as much energy in order for a reaction to occur, so more collisions result in a reaction, so the Energy (Enthalpy) reaction rate is faster. Activation Energy (AE) with a catalyst Note that adding a catalyst does not change the amount of energy released (AH) for the reaction. PE of Reactants AH.. PE of Products Rxn Progress What effect does a catalyst have on the stoichiometry of the reaction? What effect does the catalyst have on the mechanism of a reaction? AE wlo a catalyfst

Chemistry

9th Edition

ISBN:9781133611097

Author:Steven S. Zumdahl

Publisher:Steven S. Zumdahl

Chapter12: Chemical Kinetics

Section: Chapter Questions

Problem 9RQ

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Similar questions

For a certain reaction, Ea is 135 kJ and H=45 kJ. In the presence of a catalyst, the activation energy is 39% of that for the uncatalyzed reaction. Draw a diagram similar to Figure 11.14 but instead of showing two activated complexes (two humps) show only one activated complex (i.e., only one hump) for the reaction. What is the activation energy of the uncatalyzed reverse reaction?
The label on a bottle of 3% (by volume) hydrogen peroxide, H2O2, purchased at a grocery store, states that the solution should be stored in a cool, dark place. H2O2decomposes slowly over time, and the rate of decomposition increases with an increase in temperature and in the presence of light. However, the rate of decomposition increases dramatically if a small amount of powdered MnO- is added to the solution. The decomposition products are H2O and O2. MnO2 is not consumed in the reaction. Write the equation for the decomposition of H2O2. What role does MnO2 play? In the chemistry lab, a student substituted a chunk of MnO2 for the powdered compound. The reaction rate was not appreciably increased. WTiat is one possible explanation for this observation? Is MnO2 part of the stoichiometry of the decomposition of H2O2?
Substances 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?
Consider a reaction that has two parallel pathways both first-order to products. Pathway 1, leading to product B, has a rate constant of 1.34105s1. Product C- producing pathway 2 has a rate constant of 6.55104s1. Plot the concentrations of A, B, and C versus time, and determine the time necessary to produce the maximum amount of the kinetically favored product.