An isolated system is that system in which

Options

A. There is no exchange of energy with the is zero
B. There is exchange of mass and energy with the surroundings
C. There is no exchange of mass or energy with the surroundings
D. There is exchange of mass with the surroundings

Answer

To solve the question regarding an isolated system, we will break down the definition and characteristics of such a system step by step.

### Step-by-Step Solution:

1. **Definition of an Isolated System**:
An isolated system is defined as a physical system that does not exchange matter or energy with its surroundings. This means that both heat (energy) and mass (matter) remain constant within the system.

2. **Characteristics of Isolated Systems**:
- **No Exchange of Energy**: There is no transfer of heat or work between the system and its surroundings. This means that the internal energy of the system remains unchanged.
- **No Exchange of Matter**: There is also no transfer of mass into or out of the system. The total mass of the system remains constant.

3. **Evaluating Options**:
- **Option 1**: "There is no exchange of energy."
- This statement is partially correct but incomplete, as it does not mention the lack of matter exchange.
- **Option 2**: "There is exchange of mass and energy."
- This statement is incorrect, as an isolated system does not allow any exchange.
- **Option 3**: "There is no exchange of mass or energy with the surroundings."
- This statement is correct, as it encompasses both energy and matter exchange.
- **Option 4**: "There is exchange of mass."
- This statement is incorrect, as it contradicts the definition of an isolated system.

4. **Conclusion**:
The correct option that accurately describes an isolated system is **Option 3**: "There is no exchange of mass or energy with the surroundings."