What is the effect on chemical properties and physical properties of water when temperature is changed ?

Options

A. Chemical properties of water remain same but the physical state changes with change in temperature.
B. Chemical properties of water change with change in temperature but physical properties remain same.
C. There is no effect on chemical or physical properties of water when temperature is changed.
D. Both chemical and physical properties of water change with change in temperature.

Explanation

To answer the question about the effect of temperature change on the chemical and physical properties of water, we can break it down into a step-by-step analysis.

### Step-by-Step Solution:

1. **Understanding Chemical Properties**:
- Chemical properties refer to the characteristics of a substance that become evident during a chemical reaction. For water (H₂O), these include its ability to react with acids, bases, and other substances.

2. **Understanding Physical Properties**:
- Physical properties are characteristics that can be observed or measured without changing the substance's chemical identity. For water, these include state (solid, liquid, gas), boiling point, melting point, density, and viscosity.

3. **Effect of Temperature on Water**:
- When the temperature of water changes, it can transition between different states:
- **At low temperatures** (0°C and below), water freezes and becomes ice (solid state).
- **At high temperatures** (100°C and above), water boils and becomes steam (gas state).

4. **Chemical Properties Remain Unchanged**:
- Despite these changes in state, the chemical composition of water (H₂O) remains the same. The molecular structure does not change with temperature; therefore, its chemical properties remain unchanged.

5. **Physical Properties Change**:
- The physical properties of water do change with temperature:
- **Melting Point**: The temperature at which ice turns to water.
- **Boiling Point**: The temperature at which water turns to steam.
- **Density**: The density of water changes with temperature; for example, ice is less dense than liquid water, which is why ice floats.

6. **Conclusion**:
- In summary, when the temperature of water changes, the chemical properties remain the same, while the physical properties, such as state, melting point, boiling point, and density, change.

### Final Answer:
- **Chemical properties of water remain the same with temperature changes, while physical properties change.**