When water is converted into ice, its entropy

Options

A. Increases
B. Decreases
C. Remains unchanged
D. First decreases and then increases

Answer

To determine the change in entropy when water is converted into ice, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Entropy**:
- Entropy is a measure of disorder or randomness in a system. The higher the entropy, the more disordered the system is.

2. **Comparing Water and Ice**:
- Water (liquid state) has a higher degree of disorder compared to ice (solid state). In water, molecules are free to move around and are not arranged in any fixed structure. This results in a high level of randomness.
- In contrast, ice has a structured arrangement of molecules. The water molecules in ice are arranged in a hexagonal lattice, which means they are more ordered and have less freedom to move.

3. **Analyzing the Change**:
- When water freezes to become ice, the molecules lose energy and move closer together, forming a structured solid. This transition from a liquid (high entropy) to a solid (low entropy) indicates a decrease in disorder.

4. **Conclusion**:
- Therefore, when water is converted into ice, its entropy decreases.

### Final Answer:
When water is converted into ice, its entropy decreases.

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