Water

WaterWater HH22OO2 hydrogen atoms, 2 hydrogen atoms, 1 oxygen atom1 oxygen atom

It’s a compound It’s a compound

WaterWaterCovalent compoundCovalent compoundSharing valence Sharing valence electrons (Veelectrons (Ve--))

Sharing VeSharing Ve-- unequally unequally

WaterWater ““H” side tends to be pos.H” side tends to be pos. ““O” side tends to be O” side tends to be neg.neg.

Like tiny “magnets”Like tiny “magnets”PolarPolar

WaterWater Cohesion- Cohesion-

attraction of attraction of the liquid the liquid molecules molecules to to themselvesthemselves

Adhesion- Adhesion- attraction of attraction of the liquid the liquid molecules molecules to other to other moleculesmolecules

WaterWater

Penny Surface

Surface Surface TensionTension Pulling together of the Pulling together of the surface molecules of a surface molecules of a liquidliquid

Water has high surface Water has high surface tensiontension

Surface TensionSurface TensionWater’s Water’s surface has surface has a “skin”a “skin”

A small A small force will force will not break not break the “skin”the “skin”

Edge of paperclip

Surface Surface TensionTension‼In glass, water In glass, water curves up the sides curves up the sides

‼MeniscusMeniscus