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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Which had the highest energy-the reactants the products or the activated complex?
Transcribed Image Text:Roole of Értergy in RoeactioriS
In order for a reaction to begin, energy is needed to form an Endothermic
activated complex. The energy needed to form an activated
complex is called activation energy. It comes from effective
collisions. Activation energy is needed whether heat is absorbed or
released during a chemical reaction. Heat absorbed or released
during a chemical reaction is called heat of reaction or enthalpy
(AH). Enthalpy is the difference between the potential energy of the
products and the reactants (AH=H,products-Hpeactants). In exothermic
reactions, ones in which energy is released, the potential energy of
the products is lower than the potential energy of the reactants and
AH is negative. For endothermic reactions, ones in which energy is
absorbed, the potential energy of the products is higher than the
potential energy of the reactants and AH is positive. Catalysts
reduce the activation energy for both exothermic and endothermic
reactions but have no effect on the change in enthalpy.
C+D A+B (AH positive)
Activation energy
without catalyst
Activated
complex
Activation energy
with catalyst
AH
%3D
Potential energy
of reactants
Potential
energy of
products
Reaction coordinate
Answer the questions below based on the reading and the graph above, and based on your knowledge of
chemistry.
1. Based on the graph above:
a. Which has the highest energy-the reactants, the products, or the activated complex?
Potential energy
Expert Solution
Step 1
Activated complex are highly unstable. In a reaction reactants pass through an activated complex then give product .
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