Question

1. ice floats! so what? consider what would happen if ponds and other bodies of water accumulated ice at the bottom. describe why this property of water is important.
2. now, explain why ice floats. why is 4°c the critical temperature?
3. review and define these terms:

solvent:
solution:
solute:
aqueous solution:

Explanation:

1. If ice sank, bodies of water would freeze from the bottom - up, killing aquatic life as the water column would be disrupted and there would be no insulating layer of ice on the surface to protect the remaining liquid water. Ice floating provides an insulating layer that helps maintain a relatively stable temperature in the water below, allowing aquatic organisms to survive winter.
2. Ice floats because water expands upon freezing, making it less dense than liquid water. At 4°C, water reaches its maximum density. As the temperature drops below 4°C, water molecules start to form a more open - lattice structure (ice), which is less dense.
3. Solvent: A substance that dissolves other substances to form a solution. Solution: A homogeneous mixture of two or more substances. Solute: A substance that is dissolved in a solvent to form a solution. Aqueous solution: A solution in which water is the solvent.

Answer:

1. Ice floating provides insulation, protecting aquatic life. If it sank, bodies of water would freeze from bottom - up, harming life.
2. Ice floats as it is less dense than liquid water due to expansion on freezing. 4°C is critical as water has maximum density at this temperature.
3. Solvent: Substance that dissolves others. Solution: Homogeneous mixture. Solute: Substance dissolved in solvent. Aqueous solution: Solution with water as solvent.