BIOS 100 Lecture Notes - Lecture 1: Chemical Polarity, Surface Tension, Covalent Bond

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20 Jan 2017
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Properties of water and early oceans
-chemical evolution likely occurred in an aqueous or water based environment
-life is based on water because it’s an excellent solvent
-the substance that gets dissolves is the solute
-substances are more likely to react when they are dissolved in a solvent like water
Why is water such an efficient solvent?
-Hydrogen bonds can also form between a water molecule and any other polar molecule
-Hydrophilic (water loving) atoms and molecules
-are ions and polar molecules that stay in solution
-they interact with waters partial charges
-Hydrophobic (water fearing) molecules
-are uncharged and nonpolar compounds
-they do not dissolve in water
- Hydrophobic molecules interact with each other through hydrophobic interactions
Cohesion, Adhesion, and surface tension
-water has several properties due to its ability to form hydrogen bonds:
-Cohesion
- Adhesion
- Denser as a solid than a liquid
- Ability to absorb large amounts of energy
The role of water in acid base chemical reactions
-Water molecules dissociate into a hydrogen ion (H+) and a hydroxide ion (H-)
-This happens in both directions at approximately the same rate= chemical equilibrium
-Since protons (H+) don’t exist by themselves, the reaction usually produces hydronium ion
- Acids are substances that give up protons during chemical reactions and raise the hydronium
ion
-Increases proton concentration
-Bases are substances that acquire protons during chemical reactions and lover hydronium ion
-Decreases proton concentration
The importance of organic molecules
-Carbon is the most versatile atom on earth
-Due to its four valence electrons
- It can form many covalent bonds
-Organic compounds are molecules that contain carbon bonded to other elements (H)
-Almost limitless array of molecular shapes
- With combinations of single and double bonds
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Document Summary

Chemical evolution likely occurred in an aqueous or water based environment. Life is based on water because it"s an excellent solvent. The substance that gets dissolves is the solute. Substances are more likely to react when they are dissolved in a solvent like water. Hydrogen bonds can also form between a water molecule and any other polar molecule. Are ions and polar molecules that stay in solution. Hydrophobic molecules interact with each other through hydrophobic interactions. Water has several properties due to its ability to form hydrogen bonds: Denser as a solid than a liquid. Ability to absorb large amounts of energy. The role of water in acid base chemical reactions. Water molecules dissociate into a hydrogen ion (h+) and a hydroxide ion (h-) This happens in both directions at approximately the same rate= chemical equilibrium. Since protons (h+) don"t exist by themselves, the reaction usually produces hydronium ion.

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