Which is correct for an endothermic reaction ?

Options

A. `Delta H` is positive
B. `Delta H` is negative
C. `Delta E` is negative
D. `Delta H = 0`

Explanation

To determine which statement is correct for an endothermic reaction, we can follow these steps:

### Step-by-Step Solution:

1. **Definition of Endothermic Reaction**:
- An endothermic reaction is a process that absorbs heat from its surroundings. This means that the system takes in energy in the form of heat.

2. **Change in Enthalpy (ΔH)**:
- In an endothermic reaction, the change in enthalpy (ΔH) is positive. This indicates that the energy of the products is greater than the energy of the reactants.

3. **Example of Endothermic Process**:
- A common example of an endothermic process is the evaporation of water. In this process, liquid water absorbs heat to convert into water vapor.

4. **Breaking of Bonds**:
- During evaporation, the hydrogen bonds between water molecules must be broken. This requires energy, which is absorbed from the surroundings, confirming that the process is endothermic.

5. **Conclusion**:
- Since ΔH is positive for endothermic reactions, we can conclude that the correct statement for an endothermic reaction is that ΔH > 0.

### Final Answer:
The correct statement for an endothermic reaction is that ΔH is positive (ΔH > 0).

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