Friday, February 27, 2015

Why water is required for life to exist.


https://www.youtube.com/watch?v=ZScEgE55XTM

OVERVIEW:



Water is polar: Oxygen holds its Hydrogen bonds strongly (covalent bond) so much that it polarizes it towards the oxygen (oxygen is highly “electronegative”).
As a molecule whole, Hydrogens are + and O2 are – so a second bond forms between the molecules allowing ice to float—a new lattice.  It also creates a high heat capacity (holds heat) allowing for thermoregulation and a conduit for metabolism to occur.  It dissolves materials as well.  Water is a good solvent because it is polar (having a + and – side on the molecule).  It breaks solutes (NaCl) into its parts.


TERMS:

Solute:

Solvent:

Covalent Bonds:

Hydrogen Bonds:

Ionic Bonds:

Thermoregulation:

Metabolism:

Electronegative:

Simulations from the University of Colorado:



http://phet.colorado.edu/

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