Chapter 21, Problem 49A

State whether water at the following temperatures will expand or contract when warmed: $0°C;4°C;6°C$.

To determine

To identify: Whether water at the given temperatures will expand or contract when warmed.

Answer to Problem 49A

It will contract at $0°\text{C}$ , expand at $4°\text{C}$ and expand at $6°\text{C}$ .

Explanation of Solution

Introduction:

Denser the water be, the lesser volume it would have.

The given temperatures are $0°\text{C}$ , $4°\text{C}$ and $6°\text{C}$

Increasing the temperature will increase collisions and will make the object hotter because of which particle will intend to expand in it. At $0°\text{C}$ , water exists in co-state with ice. It is much denser at this temperature. Thus, increasing the temperature will not affect it much as the volume will keep decreasing till $4°\text{C}$ and will contract. But, $4°\text{C}$ its volume will be at the lowest, increasing the temperature will increase its less dense volume. Hence, water will expand at $4°\text{C}$ .

Now, at $6°\text{C}$ the water will keep expanding as the temperature is increasing.

Conclusion:

Thus, at $0°\text{C}$ water/ice will contract, at $4°\text{C}$ the water will expand and at $6°\text{C}$ water will keep expanding.