BIOL 112 Lecture Notes - Lecture 2: Covalent Bond, Hydrogen Bond, Chief Operating Officer

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Hydrogen and carbon are most important in biology. Atoms contain protons and neutrons in nucleus and electrons. All elements have atomic mass (dalton = d) Date bones (organic matter) with help from content of c14. Compare it to c14 content from today"s atmosphere. Hydrogen, carbon, nitrogen, oxygen, phosphorus, sulfur, chlorine, Sharing of electron between 2 atoms (h2) Electrons are completely evenly distributed between 2 atoms. One of the atoms (more electronegative) pulls electrons closer to itself. Hydrogen bonding is a special case of covalent bonding. Hydrogen bonds to a very electronegative atom. Nacl is a crystal composed of two ions (na+ and cl-) Nonpolar molecules are attracted to each other due to relatively weak attractions. Polar molecules and ions that dissolve readily in water. Non polar molecules do not dissolve in water. Water forces nonpolar molecules together to minimize their disruptive effects on the hydrogen bonded water network. A chemical reaction can be written as an equation.

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