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Explain why ice floats on water.

   Explain why ice floats on water.

Chemistry The Science in Context

Chemistry The Science in Context

Thomas R. Gilbert 5th Edition

Chapter 10, Problem 114

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Solved by Expert David Collins

04/30/2020

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Density is defined as mass per unit volume. It can be represented mathematically as: \[ \text{Density} = \frac{\text{Mass}}{\text{Volume}} \] Show more…

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Explain why ice floats on water.

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Key Concepts

Density

Density is defined as the mass per unit volume of a substance. When a substance's density decreases, it becomes less massive for its volume, making it more likely to float in a denser medium. The reason ice floats is because its density is lower than that of liquid water, which is a direct consequence of how its molecules are arranged when frozen.

Hydrogen Bonding

Hydrogen bonding is the attractive force between the hydrogen atom of one water molecule and the oxygen atom of a neighboring water molecule. This interaction significantly influences the behavior and properties of water, especially during phase changes. In the solid phase, hydrogen bonding forces water molecules into a fixed, open arrangement, resulting in a lower density than in liquid form.

Molecular Arrangement in Solids

In the solid state, water molecules form a crystalline lattice that maintains a greater distance between the molecules compared to the denser, more disorganized liquid phase. This open structure, caused by the spatial requirements of hydrogen bonds, leads to an increase in volume without a corresponding increase in mass, which in turn explains why the solid state is less dense than the liquid state.

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