Energy required for start of a chemical reaction is

Options

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

Answer

To solve the question regarding the energy required for the start of a chemical reaction, we will analyze the options provided and identify the correct answer step by step.

### Step 1: Understand the Question
The question asks for the type of energy that is required to initiate a chemical reaction.

**Hint:** Look for a term that specifically relates to the energy barrier that must be overcome for a reaction to occur.

### Step 2: Analyze the Options
The options given are:
1. Activation energy
2. Entropy
3. Potential energy
4. Kinetic energy

**Hint:** Consider the definitions of each term and how they relate to chemical reactions.

### Step 3: Define Activation Energy
Activation energy is defined as the minimum amount of energy that must be provided for reactants to undergo a chemical reaction. It represents the energy barrier that must be overcome for the reaction to proceed.

**Hint:** Think about how every chemical reaction requires some initial energy input to start.

### Step 4: Evaluate Other Options
- **Entropy**: This refers to the measure of disorder or randomness in a system and does not directly relate to the energy needed to start a reaction.

- **Potential Energy**: This is the energy stored in an object due to its position or state, not specifically related to initiating a chemical reaction.

- **Kinetic Energy**: This is the energy of an object in motion and does not pertain to the energy required to start a reaction.

**Hint:** Eliminate options that do not directly relate to the initiation of a chemical reaction.

### Step 5: Conclusion
After evaluating all the options, the only term that correctly describes the energy required to start a chemical reaction is **activation energy**.

**Final Answer:** The energy required for the start of a chemical reaction is **activation energy** (Option 1).