Biology Ch 3

• Four main properties of water are cohesion and adhesion, surface tension, evaporative cooling, water density, and being the universal solvent
• Adehsion is when a molecule is attracted to a surface
• Cohesion is the attraction between molecules of the same substance.
• Surface tension is how hard it is to break the surface of a liquid
• Evaporative cooling is when water vapour is evaporated from the surface leaving it cooler. This helps stabilize temperatures in organisms
• Water is more dense than ice
• Water can dissolve most substances
• Acids has more H+ ions
• pH scale goes from 0 - 14
• Bases have less H+ ions
• Neutral is 7
• 0-7 is acidic
• 7-14 is basic
• The formula is pH=-log[H+]
• Buffers minimizes change in concentrations
• Hydroxyl (--OH)
• Carboxyl (-COOH)
• Amino (-NH2)
• Sulfhydryl (-SH)
• Phosphate (-OPO32-)
• Methyl (CH3)
• Hydroxyl (OH)
• Methyl (CH3)
• Amino (NH2)
• Carbonyl (C=O)
• Phosphate (OPO32-)
• Carboxyl (COOH)
• Sulfhydryl (SH)