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5_Water - Water Structure and Propertiies Water Structure...

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W W W a a a t t t e e e r r r S S S t t t r r r u u u c c c t t t u u u r r r e e e a a a n n n d d d P P P r r r o o o p p p e e e r r r t t t i i i e e e s s s Most cells are surrounded by water, and cells themselves are about 70–95% water The abundance of water is the main reason the Earth is habitable Four of water’s properties that facilitate an environment for life are: Cohesive behavior Ability to moderate temperature Expansion upon freezing Versatility as a solvent (water is a the nearest thing known to a universal solvent; it dissolves more substances than anything else.) ¾ ¾ ¾ M M M o o o l l l e e e c c c u u u l l l a a a r r r s s s t t t r r r u u u c c c t t t u u u r r r e e e Oxygen has six electrons in the outer shell, so it needs two more to complete the shell. It gets them by sharing two electron pairs with hydrogen. Oxygen is more electronegative than hydrogen, so the covalent bond is polarized. δ + δ + δ δ Water is a nonlinear molecule; partial negative charges point in one direction, partial positive charges point in the other direction yielding a tetrahedral arrangement of charges.
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This geometry of partial negative and partial positive charges results in hydrogen bonding to other water molecule
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