1. WaterWater
HH22OO
2 hydrogen atoms, 12 hydrogen atoms, 1
oxygen atomoxygen atom
It’s a compoundIt’s a compound

2. WaterWater
Covalent compoundCovalent compound
Sharing valenceSharing valence
electrons (Veelectrons (Ve--
))
Sharing VeSharing Ve--
unequallyunequally

4. WaterWater
““H” side tends to be pos.H” side tends to be pos.
““O” side tends to be neg.O” side tends to be neg.
Like tiny “magnets”Like tiny “magnets”
PolarPolar

8. WaterWater
 Cohesion-Cohesion-
attraction ofattraction of
the liquidthe liquid
molecules tomolecules to
themselvesthemselves

9. Adhesion-Adhesion-
attraction ofattraction of
the liquidthe liquid
molecules tomolecules to
otherother
moleculesmolecules
WaterWater

10. Penny Surface

11. SurfaceSurface
TensionTension Pulling together of the surfacePulling together of the surface
molecules of a liquidmolecules of a liquid
 Water has high surfaceWater has high surface
tensiontension

13. Surface TensionSurface Tension
Water’sWater’s
surface hassurface has
a “skin”a “skin”
A smallA small
force will notforce will not
break thebreak the
“skin”“skin”

15. Edge of
paperclip

16. SurfaceSurface
TensionTension
‼In glass, water curvesIn glass, water curves
up the sidesup the sides
‼MeniscusMeniscus