The energy that is required to react is called

Options

A. Potential energy
B. Kinetic energy
C. Activation energy
D. Radiant energy

Answer

To solve the question "The energy that is required to react is called," we will analyze the options provided and identify the correct answer step by step.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the specific type of energy that is required to initiate a chemical reaction. This is a fundamental concept in chemistry related to how reactions occur.

**Hint**: Focus on what type of energy is needed to start a reaction.

2. **Reviewing the Options**:
- **Potential Energy**: This is the energy stored in an object due to its position or arrangement. It does not directly relate to initiating a reaction.
- **Kinetic Energy**: This is the energy of motion. While it can influence reactions, it is not the specific energy required to start a chemical reaction.
- **Activation Energy**: This is the minimum energy required to initiate a chemical reaction. It is a critical concept in understanding how reactions proceed.
- **Radiant Energy**: This is the energy carried by electromagnetic waves. It is not specifically related to initiating chemical reactions.

**Hint**: Eliminate options that do not directly relate to starting a reaction.

3. **Identifying the Correct Answer**: Among the options, "Activation Energy" is the only term that specifically refers to the energy needed to start a reaction. It is denoted by \(E_a\) and is measured in units such as kilojoules per mole (kJ/mol) or kilocalories per mole (kcal/mol).

**Hint**: Look for the term that specifically refers to the energy needed to overcome the energy barrier for a reaction.

4. **Conclusion**: The correct answer to the question is **Activation Energy**.

### Final Answer:
The energy that is required to react is called **Activation Energy**.