Properties of Water PolarPolar Surface TensionSurface Tension Cohesion/AdhesionCohesion/Adhesion Universal SolventUniversal Solvent Capillary ActionCapillary Action High Specific HeatHigh Specific Heat Less Dense as a SolidLess Dense as a Solid
Water threeA water molecule (H 2 O), is made up of three atoms --- one oxygen and two hydrogen. H H O
O H H 1 molecule of water is made up of 2 hydrogen atoms bonded with 1 oxygen atom STRUCTURE OF WATER
O H H O H H O H H O H H O H H O H H O H H O H H O H H O H H O H H O H H O H H O H H O H H O H H O H H O H H A LOT OF MOLECULES OF WATER
Millions of molecules of water make up 1 raindrop
Water is Polar oxygennegativeThe oxygen end “acts” negative hydrogenpositiveThe hydrogen end “acts” positive POLARCauses the water to be POLAR neutralZero Net ChargeHowever, Water is neutral --- Zero Net Charge
Interaction Between Water Molecules Negative Oxygen end of one water molecule is attracted to the Positive Hydrogen end of another water molecule to form a HYDROGEN BOND
This is a nickname given to water. Water dissolves LOTS of things. Remember: SOLVENT = the thing doing the dissolving SOLUTE = the thing that dissolves away Other polar molecules can be dissolved by water.
Universal Solvent Why is water so good at dissolving things? Because water is a polar molecule and is shaped like a wedge, it is able to break up substances into smaller pieces (dissolve).
CAPILLARY ACTION The combined force of attraction among water molecules and with the molecules of the surrounding material. Cohesion + Adhesion
Adhesion Causes Capillary Action Which gives water the ability to “climb” structures
SPECIFIC HEAT Specific Heat = the amount of energy needed to increase the temperature of something 1 degree C. Water has a really HIGH specific heat That means it takes a lot of energy for water to increase its temperature. This is because of the STRONG ATTRACTION between water molecules. It’s POLAR!
34 Ice, water, vapor Lower density of ice causes it to float & insulate the water below
Properties of Water At sea level, pure water boils at 100 °C and freezes at 0 °C.At sea level, pure water boils at 100 °C and freezes at 0 °C. The boiling temperature of water decreases at higher elevations (lower atmospheric pressure).The boiling temperature of water decreases at higher elevations (lower atmospheric pressure). For this reason, an egg will take longer to boil at higher altitudesFor this reason, an egg will take longer to boil at higher altitudes
STRUCTURE OF WATER POLAR MOLECULE CAPILLARY ACTION SURFACE TENSION UNIVERSAL SOLVENT COHESION ADHESION DENSITY BUOYANCY SPECIFIC HEAT