IUB BIOL-L 112 - Water's Role in Life (2 pages)

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Water's Role in Life



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Water's Role in Life

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Lecture number:
1
Pages:
2
Type:
Lecture Note
School:
Indiana University, Bloomington
Course:
Biol-L 112 - Foundations of Biology: Biological Mechanisms

Unformatted text preview:

BIOL L 112 1nd Edition Lecture 1 Outline of Current Lecture I Water s Role in Life A Electronegativity and the Difference Between Polar and Nonpolar Molecules II Water s Ability to Form Hydrogen Bonds III Two of the Four Emergent Properties of Water Current Lecture I Water plays a crucial role in life processes Water is unique because of the way it exists as a solid liquid and gas in the natural environment Organisms need this molecule more than any other substance in order to survive Example In the arctic water exists as a liquid in the ocean a solid as ice and a gas as water vapor in the sky A Water is a highly polar molecule Because the oxygen atom is more electronegative that the hydrogen atoms the electrons are pulled towards oxygen This creates a partial negative on oxygen and a partial positive on both hydrogen atoms Electronegativity is a calculated value that describes the ability of an atom to attract electrons towards itself As a general rule electronegativity increases across the rows in the periodic table o Non polar molecules share electrons equally between a covalent bond because the atoms do not have much of a difference in electronegativity They are usually symmetrical Examples CH4 O2 o Polar molecules do not share covalent bonds equally creating partial positive and partial negative charges They are usually asymmetrical Examples H 2O NH3 II Because of the polarity of water it is able to form hydrogen bonds with four other water molecules The two partial positive charges on hydrogen form a hydrogen bond with the oxygen atoms in two different water molecules while the oxygen is able to form two hydrogen bonds with two different hydrogen molecules Hydrogen bonds are much weaker than covalent bonds and constantly break and reform quickly with different water molecules These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute III Hydrogen bonding allows water



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