Which is true about catalyzed reactions? O The net concentration of catalyst does not change O Catalysts provide an alternative pathway for the reaction to occur O Catalyst lowers the activation energy of the chemical reaction All of the choices

Which is true about catalyzed reactions? O The net concentration of catalyst does not change O Catalysts provide an alternative pathway for the reaction to occur O Catalyst lowers the activation energy of the chemical reaction All of the choices

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

Which is true about catalyzed reactions?
O The net concentration of catalyst does not change
O Catalysts provide an alternative pathway for the reaction to occur
O Catalyst lowers the activation energy of the chemical reaction
All of the choices

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Which of the following will decrease the activation energy, Ea, of a reaction? O Increasing the reactant concentrations Removing the products as they form O Increasing the temperature O Adding a catalyst O Decreasing the pressure A Moving to another question will save this response. M esc 20 F3 F1 F2 F4 F5 @ #3 24 4 Q W R. A
The following graph shows two different reaction pathways for the same overall reaction at the same temperature. Which pathway would you predict involves a catalyst and why? a) blue, because the activation energy is lower b) red, because the activation energy is higher c) red, because the activation energy is lower d) both reaction pathways have the same activation energy so neither involves a catalyst
Which of the following is NOT a reason why a catalyst can speed up a reaction?a. Increasing the pre-exponential term of the Arrhenius equation b. Decreasing effective collisions between reactants c. Providing a different reaction path d. Lowering of activation energy
Select the true statement regarding catalysis of chemical reactions Catalysts appear in the overall reaction equation. Catalysts decrease the reaction enthalpy. Catalysts decrease the activation energy. O The catalyzed and uncatalyzed versions of a chemical reaction have the same mechanism. Catalysts decrease the reaction rate.
For the chemical reaction system described by the diagram below, which statement is true? Energy Reaction Progress The activation energy for the reverse reaction is greater than the activation energy for the forward reaction. O The forward reaction is endothermic. O The activation energy for the forward reaction is greater than the activation energy for the reverse reaction. O At equilibrium, the activation energy for the forward reaction is equal to the activation energy for the reverse reaction. O The reverse reaction is exothermic.
The question is in the image.
Generally, increasing the temperature increases the rate of a reaction. This is because: O increasing the temperature increases the frequency of collisions O increasing the temperature increases the average energy of the collisions and increases the frequency of collisions O increasing the temperature lowers the activation energy of the reaction increasing the temperature increases the average energy of the collisions.
At chemical equilibrium, what is true about the forward rate and reverse rate? The forward rate is greater than the reverse rate The forward rate is less than the reverse rate The forward rate is changing faster than the reverse rate The forward rate is the same as the reverse rate
A bimolecular reaction can involve a single reactant
Rate of chemical reactions
Which of the following is true? Decreasing the activation energy decreases the reaction rate. Decreasing the activation energy increases the reaction rate. The activation energy of an exothermic reaction is negative. There is no relationship between activation energy and reaction rate.
Which is true? A slow reaction has low activation energy. A fast reaction has large activation energy. The size of the activation energy tells us about the reaction rate. The size of the activation energy tells us about the reaction mechanism.