BY123 chapter 3 - Chapter Three: Water Water is the only...

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Chapter Three: Water Water is the only common substance to exist in the natural environment in all three states of matter Cells are about 20-90% water H 2 O has polar covalent bonds (covalent bonds, and the electrons stay around the oxygen atom because it is more electronegative, so oxygen end is more negative, hydrogen ends more positive) Polar molecule - the two ends of the molecule have opposite charges Hydrogen bond - formed when a hydrogen atom covalently bonded to one electronegative atom is also attracted to another electronegative atom (in this case, hydrogen is bonded to two oxygens) This bond is not strong. WHAT IS THE BOND IN A WATER MOLECULE? POLAR COVALENT WHAT IS THE BOND BETWEEN WATER MOLECULES? HYDROGEN BOND Cohesion - water clinging together o Contributes to the transport of water and dissolved nutrients against gravity in plants Adhesion - the clinging of water to hydrophilic substances. Helps water defy gravity. Surface tension
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This note was uploaded on 08/07/2009 for the course BY 123 taught by Professor Cusic during the Spring '07 term at University of Alabama at Birmingham.

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BY123 chapter 3 - Chapter Three: Water Water is the only...

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