biol 227 Exam Study Guide with Complete Answers

biol 227 Exam Study Guide with Complete Answers
organic compound

substances containing both H and C

inorganic compound

substances that do NOT contain H and C

cohesion

attraction between water molecules

surface tension

inward pulling on surface of the water

adhesion

attraction between water molecules and a substance other than water

reason for water properties

hydrogen bonds

suspension

heterogenous, large particles, suspended in fluid, does not remain mixed unless in motion

colloid

smaller particles, cloudy/opaque, remains mixed when not in motion
ex: milk, cytosol, blood plasma

emulsion

specific type of colloid
water + non polar (hydrophobic) substance

, doesn't "mix" unless agitated
ex: breast milk

solution

homogenous mixture with dissolved particles
solvent + solute
ex: salt water, sugar water

solvent

liquid that dissolves solute

dissociation

solute molecules come apart

dissociate vs dissolve

dissolve: mixing solute into solvent; creates homogenous mixture
dissociate: breaking down molecule or compound into smaller parts

hydrophobic

Water fearing, non polar molecules

acid

H+ donor
increase [H+] (concentration)
strong acid: dissociate to greater extent
weak acid: dissociate to lesser extent

base

H+ acceptor
decreases [H+]