University:
Missouri State University
Course:
CHM 160 | General Chemistry I
Academic year:

2022
Views:

138

Pages:

23
Author:

Kaiden Murphy

Roughly 70 percent of an adult’s body is made up of water. http://www.healthy-water-best-filters.com/human-water-cycle.html By the time a person feels thirsty, his or her body has lost over 1 percent of its total water amount. http://fiteats.wordpress.com/page/3/ Although a person can live without food for more than a month, a person can only live without water for approximately one week. http://science.howstuffworks.com/environmental/earth/geophysics/h2o3.htm Your brain is 75-85% water and plays a vital role in your body's response to dehydration. It controls water intake through altering thirst and varying the water excretion from your kidneys. http://www.mpip-mainz.mpg.de/documents/akbu/pages/ssci.html 8P 8N 1P 0N 1P 0N Hydrogen Bonding Simulation Images from: http://understanding-biology.blogspot.com/2010/01/floating-paper-clip-cohesion-surface.html Water acts like a heat buffer for the globe. Image from: http://www.wallpaperbase.com/landscape-iceberg.shtml “Universal solvent”  Solution = liquid consisting of uniform mixture of two or more substances › Two parts of a solution:  Solvent = liquid (dissolving agent)  Solute = substance dissolved › EXAMPLE:  Water = solvent Koolaid powder/sugar = solutes Kool-aid = solution ➢ Remember the rule to make a solution: “Like dissolves like.” › Since water is polar, it will dissolve ions and other polar substances (like salt!) Na+ Cl› Hydrophilic = Water Lover › Water will NOT dissolve nonpolar substances      Electrons are shared equally in nonpolar molecules. Oil is an example of a nonpolar molecule. It does not form hydrogen bonds. Like dissolves like, therefore, oil (nonpolar) does not mix with water (polar). Nonpolar molecules are hydrophobic (“afraid of water”) because they do not mix with water. surface tension =A measure of how difficult it is to stretch or break the surface of a liquid. Water has a high surface tension because of the hydrogen bonding of surface molecules Electronegativity=The attraction of an atom for the electrons of a covalent bond Electronegativity is the tendency for an atom to pull electrons toward itself. Two atoms of the same element have equal electro-negativities; in a covalent bond they share electrons equally, forming a nonpolar covalent bond.