Does Water Expand When It Freezes?

The video explains why water expands when it freezes, due to its unique molecular structure. Water molecules form a crystalline lattice at freezing point, increasing volume and decreasing density, allowing ice to float. This phenomenon is crucial for aquatic ecosystems, preventing bodies of water from freezing solid and supporting life.

What happens to the volume of water as it freezes?

• It decreases.

• It remains the same.

• It fluctuates randomly.

• It increases.

What unique property of water molecules contributes to its high heat capacity?

• Their metallic nature.

• Their unique arrangement and hydrogen bonding.

• Their ability to conduct electricity.

• Their ability to form ionic bonds.

How do water molecules behave in liquid form?

• They are rigid and fixed in place.

• They do not interact with each other.

• They move freely, forming and breaking hydrogen bonds.

• They form a solid lattice structure.

Why does ice float on water?

• Because ice is heavier than water.

• Because ice is more compact than water.

• Because ice is less dense than water.

• Because ice is denser than water.

What would happen if ice were denser than water?

• Ice would evaporate quickly.

• Ice would dissolve in water.

• Ice would sink, affecting aquatic life.

• Ice would float on water.