Chapter 13.1, Problem 13SSC

To determine

To Explain: The way, the density of water changes as it is heated to $4\text{°C}$ and then to $\text{8°C}$ .

Answer to Problem 13SSC

If the volume increases but mass stays the same, density will decrease.

Explanation of Solution

Introduction:

A measure of hotness or coldness of a body is described as temperature. The amount of matter which is present in the object is described by its mass. The mass of a unit volume of a substance is called its density.

As the water is heated from $0°\text{C}$ , the density will increase until it reaches a maximum at $4\text{°C}$ . Means, when water is heated from $0°\text{C}$ ,its volume decreases because its density increases. Afterward, when the density decreases, the volume will increase. The main reason behind this is the hydrogen bond present in ice, gets cleaved due to the melting of ice.

On further heating to $8°\text{C}$ , the density of the water will decrease. Thus, when the volume increases but mass stays the same, density decreases.