Biology 1201 Chapter 3-Water
Biology 1201 Chapter 3-Water BIOL 1201
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This 2 page Class Notes was uploaded by Zachary Bergin on Wednesday September 7, 2016. The Class Notes belongs to BIOL 1201 at Louisiana State University taught by E. Wischusen in Fall 2016. Since its upload, it has received 4 views.
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Date Created: 09/07/16
Chapter 3-Water Water • Covalent • Weak (Hydrogen bond) • Hydrogen bonding makes water a large molecule. • In ice a water molecule interacts with exactly 4 other water molecules. • In liquid water it only interacts with 3.6 or fewer • Water sticks to polar surfaces Definitions to know • Cohesive- Water sticks to itself. • Adhesive- Water sticks to other things. • High Specific Heat-Amount if heat required to change a liquids temperature. • High Heat of Vaporization- The amount of energy it takes to make water change its state. • Hydrophilic- means attracted to water. • Hydrophobic- Means it avoids water. Water has a lower density when it’s a solid Vs. a Liquid because as a solid the molecules are stable and spread out. Water is also a Solvent for polar molecules. Dissociation Many water molecules come apart when place into water. The molecule is said to dissociate or "break-up" into constituent ions. Ex. NaCl Acids, Bases, and Salts • If a molecule dissociates and releases H+ ions then its called an Acid. • If it releases OH- or accepts H+ it is called a Base. • If a molecule releases neither it is called a Salt. PH - A measurement of hydrogen ions in a solution. Acidity of a solution is measured by the pH scale which is calculated as the pH=-log[H+] Relationship with [OH-] - The sum of the pH and pOH= 14 Na+ and Cl- Chapter 3 Water Wednesday, September 7, 2016 7:56 AM
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