Human Biology BIO 100 Week 2 Class Notes
Human Biology BIO 100 Week 2 Class Notes Biol 100
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This 4 page Class Notes was uploaded by snufkin on Thursday September 15, 2016. The Class Notes belongs to Biol 100 at San Francisco State University taught by Lynne Dowdy in Fall 2016. Since its upload, it has received 84 views. For similar materials see Human Biology in Biology at San Francisco State University.
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Date Created: 09/15/16
Biology Notes: Week 2 Chemical Bonds: 1) Nonpolar covalent bond: equal sharing of a pair of electrons between two atoms strongest type of chemical bond ● Hard to break ● A lot of energy is produced if bond is broken ● Includes proteins, carbohydrates, and fats Ex: 2) Ionic bond: ion= charged atom ions are formed when an electron is either lost or gained (when an electron is lost, there is a positive charge; when an electron is gained, there is a negative charge) electrical attraction between ions Ex: NaCl = Na + Cl Na has one valence electron, while Cl has 7. Na wants to get rid of its electron, and Cl wants to gain an electron, therefore the electron from Na is transferred to Cl, giving them opposite charges. The charge cause attraction, forming an ionic bond 3) Polar Covalent bond: A pair of electrons is shared unequally between two atoms. Ex: Water molecule (H 0) 2 ▯ = lower case Greek letter delta; denotes partiality + ▯ = partially positive ▯ = partially negative ***nonpolar covalent, ionic, and polar covalent bonds are strong bonds. If the bonds are broken, energy is released. 5) Hydrogen bond: partially positive hydrogen is attracted to a partially negative atom. 6) Hydrophobic Interaction: Polar molecules= hydrophilic Nonpolar molecules= hydrophobic Hydrophilic easily mixes, or dissolves with water Hydrophobic repels, or fails to mix with water ***hydrogen bonds and hydrophobic interactions are weak
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