Properties of Water

Properties of Water

Water Facts: Formula = H2OThree phases Solid, liquid, and gas Freezing point = 0CBoiling point = 100CInorganic molecule (aka: non-living, does not contain Carbon)Polar molecule Universal solventAbout 70% of human body is water

PolarityPolar molecules: slightly positive at one end and slightly negative on the other endWater is a polar molecule!!!!!!

Draw a picture definition of polarity on your note sheet in the empty box.

Non-polar molecules: No chargePolar molecules dissolve in waterNon-polar molecules do not dissolve in waterLike dissolves like

4Universal Solvent Solvent substance that does the dissolvingSolute substance dissolved in a solutionSolution mixture of solvent and solute

http://programs.northlandcollege.edu/biology/Biology1111/animations/dissolve.html

Magic SandDemo

What lab displayedPolarity?

CohesionAttraction between substances of the same kindEx: Water forming drops/beadingCaused by hydrogen bonds between water molecules

Surface tensionPrevents the surface of water from stretching or breaking easilyMolecules at the surface of water are linked by hydrogen bondsResult of cohesion

Natures use of Surface Tension

Drops on a pennyDemo

AdhesionAttraction between different polar substancesEx: things getting wet

Capillary ActionProperty in which water can travel up tubesPowered by adhesionEx: plants, treesAttraction between walls and water is greater than effect of gravity

Celery StalkDemo

What lab displayed both adhesion and cohesion?DensityRatio of the mass of an object to its volumeDensity = Mass (g)___ Volume (ml)The density of water = 1.0Density less than 1.0 = floatsDensity greater than 1.0 = sinksIce floats, yet cold water sinksin ice, molecules spread out (ex: soda can in freezer)Cold water moves slower than warm water, causing it to sink

Soda CanDemo

What lab displayed density?What causes water to do the amazing things it does?

Polarity