Properties of Water (part 2)

5. Temperature Modification Water has a high heat capacity – It must absorb a great deal of heat to break the Hydrogen Bonds. The temperature will rise only when the H bonds are broken When the temperature drops, the H bonds reform and the water releases energy

Example: Hot day- water absorbs lots of heat, helping to cool the air that night – water releases heat as it cools off Results: Oceans help stabilize global temperatures Water helps keep cells at an even temperature

Example: When water evaporates, it cools the surface it evaporated from Result: Sweating cools your skin

6. Density Fact: Ice is less dense than water, so it floats Reason: Hydrogen bonds have very little space between them ice = 100% H bonds water = 50% H bonds

7. Universal Solvent Because it is polar, water will dissolve most substances. In solutions – the solute breaks apart to the size of molecules or ions and evenly disperses throughout the solvent

Types of Solutions: Saturated Solution – No more solute will dissolve at that temperature. (All the spaces between the solvent molecules are filled with solute) Aqueous Solution – any solution in which water is the solvent