CHEMICAL BASIS OF LIFE-part 4.docx

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Department
Biology
Course
BIOL 151
Professor
Jaclyn Vick
Semester
Spring

Description
• Uncharged, nonpolar molecules • Hydrophobic molecules are important in nature b/c they won’t dissolve. They associate with each other b/c they’re not like water • These are important in cellular structures (membranes) • Learn about the water cycle in the book. Look at the illustration - water (H2O) us a balance if H2O, H+, OH- • Very small percentage of water molecules are ions • Pure water has an equal concentration of each H+ (hydrogen) and OH- (hydroxide) ions - pH: is the negative logarithm of the percentage of H+ ions in a solution • -if [H+] = [OH-] then the solution is neutral • -if [H+] > [OH-] then the solution is acidic • -if [H+] < [OH-] then the solution is basic -Acid: an acid is a compound that donates H+ to a solution. Ex: hydrochloric acid (HCl), found in stomach acid • “acidity” of th
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