1. The polarity of water molecules results from hydrogen bonding • Water molecule- two hydrogen atoms form _________________ ___ bonds with an oxygen atom. • Partial negative charge • Partial positive charge _____- because each share one electron ______- because O is more electronegative than ________- because they each share electrons CHAPTER 3 WATER AND THE FITNESS OF THE ENVIRONMENT
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1. The polarity of water molecules results from hydrogen bonding Water molecule- two hydrogen atoms form ____________________ bonds with an oxygen atom.
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1. The polarity of water molecules results from hydrogen bonding
• Water molecule- two hydrogen atoms form ____________________ bonds with an oxygen atom.
• Partial negative charge
• Partial positive charge
_____- because each share one electron______- because O is more electronegative than H________- because they each share electrons
CHAPTER 3WATER AND THE FITNESS OF THE
ENVIRONMENT
• Water has unusual properties because of attractions between ______ molecules.
• The slightly negative regions interact with slightly positive regions of nearby molecules, forming a _________________.
• Each water molecule can form hydrogen bonds with up to ________ neighbors.
Fig. 3.2
Properties of water1. _________- Hydrogen bonds hold
water together.
2. High ______________
Water “pulled up” to tree tops
“an invisible film”
3. _____________ air temperatures
• Water resists changes in temperature Why? _____________
Why? _____________
Why? ______________
• Freezes at __ C and boils at ____ C• As a liquid evaporates, the surface of the liquid that remains behind cools - ______________________.
4. Ice is about ________ dense than water at 4oC, thus ice ______
Thus, oceans and lakes don’t freeze solid
5. Water is the solvent of life
Why? It forms _____________________ with many molecules
• # of molecules in a mole = _______________ =6.02 x 1023.