Weegy: . Activation energy may also be defined as the minimum energy required to start a chemical reaction. [ The activation energy of a reaction is usually denoted by Ea and given in units of kilojoules per mole.
Activation energy can be thought of as the height of the potential barrier (sometimes called the energy barrier) separating two minima of potential energy (of the reactants and products of a reaction). For a chemical reaction to proceed at a reasonable rate, there should exist an appreciable number of molecules with energy equal to or greater than the activation energy.
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User: 2. In a particular chemical reaction, the energy of the reactants is 30 kJ and the energy of the products is 5 kJ. The maximum energy of the system is 40 kJ.
a. What is the activation energy for this reaction?
b. What is the enthalpy change for this reaction?
c. Is this reaction endothermic or exothermic? Explain your answer in two ways: first, using the energy values, and second, by referring to the shape of the graph.
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