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Lecture Notes for BIOL 1005 - General Biology with Lipscomb at Virginia Tech (VT)

Notes Information

Material Type:Class Note 2
Professor:Lipscomb
Class:BIOL 1005 - General Biology
Subject:Biological Sciences
University:Virginia Polytechnic Institute And State University
Term:Fall 2007
Keywords:
  • Free Radicals
  • Aging Process
  • Antioxidant
  • Electron Shell
  • No Molecules
  • pH of Blood
  • Other Molecules
  • Share Electrons
  • In/on/at a Place
  • Nonpolar Covalent Bond
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Sample Document Text

Chapter 2: Atoms, Molecules, and Life • • Chemical bonds: attractive forces that hold atoms together ○ Through electrons and electron shells ○ Sharing, losing, or gaining electrons Molecule: consists of two or more atoms ○ Water is a molecule, polar covalent bonding—sharing electrons to fill up outer electron shell; unequal sharing of electrons  Oxygen slightly negative  Hydrogen slightly positive ○ Nonpolar covalent bonding: share electrons equally; no charge on any part of molecule ○ Hydrogen bonds: bonding takes place between a hydrogen of a polar molecule and a negative region of another molecule  not very strong; relatively weak and can easily be broken ○ Ionic compounds: Na(+)Cl(-); ion is a charged atom  Charged by gaining or losing electrons  Loses electron (+)  Gains electron (-)  Attraction between opposite charges hold atoms together  Not as strong as covalent bonds but stronger than hydrogen bonds Water ○ ○ ○ ○ Water ○ is essential for life: Orga...

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