Energy must be added for a chemical reaction to start. This energy is known as the energy of .................

Explanation

To solve the question "Energy must be added for a chemical reaction to start. This energy is known as the energy of .................", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the type of energy that is required to initiate a chemical reaction. This energy is crucial for overcoming the initial barriers to the reaction.

2. **Identifying Key Terms**: The term "energy" in the context of chemical reactions often refers to the energy needed to break bonds in reactants and to form new bonds in products.

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