21. Such a collapse ( a " decay event " ) requires a specific activation energy . 22. The activation energy of the electrocyclization is 73 kJ mol " 1 for stilbene. 23. Activation energy may also be defined as the minimum energy required to start a chemical reaction.24. The complete analysis method calculates the pre-exponential factor and the activation energy at several coverages. 25. Thus, the activation energy of the overall reaction is lowered, and the rate of reaction increases. 26. The relationship between MFI and temperature can be used to obtain the activation energies for polymers. 27. In subsequent steps, the activation energy is only from the intermediate to the next transition state. 28. First we assume the pre-exponential factor and the activation energy to be independent of the coverage. 29. Thermite has a very high activation energy . 30. In order to react there has to be a source of activation energy , such as a spark.
