Properties of Water Chapter 2 Section 2.2 pg 40 & 41

W-A-T-E-R More than _______ of the earth’s surface is covered with water (H20)

WATER Atomic Structure = _______________ bonded to _______________ The ________side: slightly _________ (+) The _______ side: slightly _______ (-)

WATER: A Polar Molecule Water Molecules are _________! WHY? …Because there is ___________________ ________________________ between the oxygen and hydrogen atoms  Results in water molecules being attracted to each other, forming bondscalled _________________

Why is Polarity So Important? It allows water to dissolve many substances including other _______________ and _________________________

Water Molecules are Held Together by Hydrogen Bonds Hydrogen bonds are weak bonds between a _________________ in one molecule and a ___________________ region of another molecule Hydrogen bonds are _______________ to cause water to _____________________ _________________________

Hydrogen Bonding

Hydrogen Bonding http://www.northland.cc.mn.us/biology/Biology1111/animations/hydrogenbonds.html Animation of water binding through H bonds As a result of hydrogen bonding 2 properties of water result Cohesion and adhesion

Two properties of water result from Hydrogen Bonding Cohesion- ___________________________ ________________ (ex. water attracted to water) > _______________ cohesion of water molecules at the surface of a body of water ex. bug “walking on water”

Two properties of water result from Hydrogen Bonding Adhesion – __________________________ _______________________________________ (ex. Water molecules attracted to a glass) > _______________ the adhesion of water molecules & another substance moving up against gravity

How is Hydrogen Bonding related to Temperature? Hydrogen bonding makes water able to _____ _____________________ before it gets hot and changes temperature because hydrogen bonds must break in order for the temperature to change This is called having a ______________________

Water also has a unique density Solid water is _________________ than liquid water ex. Ice floats (icebergs) Ponds freeze from top down