The density of water decreases as it is cooled from 4.0 $\circ$ C to freezing because ________
A)water molecules decrease in size as they cool because energy is released.
B)a network of hydrogen bonds between water molecules is formed.
C)water molecules become more rigid as they cool.
D)hydrogen bonds in liquid water are longer than they are in ice.
E)all substances contract just before freezing.

Question

Quizplus · Accepted Answer

As water cools below 4°C, it begins to form a structured network of hydrogen bonds, leading to an increase in volume and a decrease in density, which is why ice floats on water.

The Density of Water Decreases as It Is Cooled from 4.0