Proper&esofWater

Proper&esofWater

•  Explainhowthepolarityofawatermoleculecontributestoitsuniqueproper&es.

•  Listanddescribehoweachpropertyofwatermakesitessen&alforlifeonEarth.

Proper&esofWater

CovalentBondH2OisacovalentbondbecauseitinvolvesthesharingofelectronsbetweenOxygenandHydrogen

Covalentbondsareforcesthatholdatomstogether.

Proper&esofWater

Thebiologicalconsequenceofpolarcovalentbondsisthatthesekindsofbondscanleadtotheforma&onofaweakbondcalledahydrogenbond.

Hydrogenbondsareclassifiedasweakbondsbecausetheyareeasilyandrapidlyformedandbrokenundernormalbiologicalcondi&ons.

Proper&esofWater

Hydrogenbonding

Thankstotheirpolarity,watermoleculeshappilyaGracteachother.

Proper&esofWater

PolarityofWaterVideo

PropertyofWater:AmoebaSisters

Proper&esofWater

Whatarethemainproper:esofwaterbasedonitsuniquehydrogenandcovalentbonding.

1.   Cohesiontheabilityofwatermoleculestos&cktogether(Hydrogenbond)

2.   Adhesionreferstotheclingingofunlikemolecules(examplewateronabladegrass)

3.   SurfaceTensionwaterabilitytostayconnectedunderpressure(cohesion).

4.   SolventwateristheUniversalsolvent5.   pHdeterminestheamountofH+andOH

Proper&esofWater

Cohesion

Incohesion,watermoleculesareaGractedtoeachother(becauseofhydrogenbonding).

Cohesionallowsforthedevelopmentofsurfacetension

Proper&esofWater

SurfaceTension

Thepropertyofthesurfaceofwaterallowsittoresistanexternalforce,duetothecohesivenatureofitsmolecules.

Proper&esofWaterAdhesion

SincewaterisaGractedtoothermolecules,adhesiveforcespullthewatertowardothersurfaces.

Proper&esofWater

Wateriscapableofdissolvingavarietyofdifferentsubstances,whichiswhyitissuchagoodsolvent.And,wateriscalledthe"universalsolvent"becauseitdissolvesmoresubstancesthananyotherliquid.Thisisimportanttoeverylivingthingonearth.

UniversalSolvent

Proper&esofWater

Watermoleculeshaveapolararrangementoftheoxygenandhydrogenatoms—oneside(hydrogen)hasaposi&veelectricalchargeandtheotherside(oxygen)hadanega&vecharge.ThisallowsthewatermoleculetobecomeaGractedtomanyotherdifferenttypesofmolecules.

UniversalSolvent(con:nued)

Proper&esofWater

UniversalSolvent(con:nued)

Proper&esofWater

UniversalSolvent(con:nued)

NaCl+H2O=HCl+NaOH

Proper&esofWater

UniversalSolvent(con:nued)

Proper&esofWaterpH

pHisameasureofthehydrogenionconcentra&onofasolu&on.Solu&onswithahighconcentra&onofhydrogenionshavealowpHandsolu&onswithalowconcentra&onsofH+ionshaveahighpH.

Proper&esofWater

Ice

Icefloatsbecauseitisabout9%lessdensethanliquidwater.