Respuesta :

Answer to go in the blank would be ''Activation''.

Answer:

Activation Energy

Explanation:

Activation energy is the amount of energy required to transform the substrate to a high energy state. Once the substrate is transformed into the high energy state, further changes convert it into the product.

Hence, activation energy is the energy required to start a chemical reaction. In the absence of enough amount of energy available in the system, the chemical reaction can not start.  

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