AP Biology Unit 1 Test Questions and
Answers
water
✓ ~~~-polar molecule
-polar colvalent bonds
-oxygen end is partial negative and the hydrogens have a partially positive end
-cohesive
polar covalent bonds
✓ ~~~-opposite ends of the molecule have opposite charges
cohesion
✓ ~~~-H bonding between H2O creates it (sticky)
-allows for the movement of water against gravity
-high surface tension
-water moves up a tree by transpiration (helped by ____)
adhesion
✓ ~~~-H2O molecules form H bonds with other substances
~capillary action
~meniscus
~water climbs up fiber
,solvent
✓ ~~~-water is the universal one
-polar water molecules will surround the (+) and (-) ions causing the ions to separate
and dissolve
-dissolve solutes and create aqueous solutions
hydrophilic
✓ ~~~-some molecules have an affinity for water
-polar and ionic molecules
-ex: cotton, cellulose, paper
hydrophobic
✓ ~~~-some substances do not have an affinity for water
-nonpolar and non ionic substances
-ex: fat, glycerol, oils
floats
✓ ~~~-less dense when it is solid, water ______
-forms crystal lattice structure
-important because oceans and lakes do not freeze solid
~insulates water below
~seasonal turnover of lakes
, specific heat
✓ ~~~-the amount of heat that must be absorbed or lost for 1g to change its temperature by
1C
-water had high _____ due to H bonding
-resists change in temp
-moderates temp on earth
evaporative cooling
✓ ~~~-organisms use to regulate their temperature
-ex: sweating
-water evaporates through a surface, cooling occurs
acidic
✓ ~~~If [H+]>[-OH]
basic
✓ ~~~If [-OH]>[H+]
pH scale
✓ ~~~-how acidic or basic a solution is
-pure water, only 1 molecule in every 554 million is dissociated
-most biological fluids have 6-8
-each unit represents a 10-fold difference in H+ and -OH concentrations
Answers
water
✓ ~~~-polar molecule
-polar colvalent bonds
-oxygen end is partial negative and the hydrogens have a partially positive end
-cohesive
polar covalent bonds
✓ ~~~-opposite ends of the molecule have opposite charges
cohesion
✓ ~~~-H bonding between H2O creates it (sticky)
-allows for the movement of water against gravity
-high surface tension
-water moves up a tree by transpiration (helped by ____)
adhesion
✓ ~~~-H2O molecules form H bonds with other substances
~capillary action
~meniscus
~water climbs up fiber
,solvent
✓ ~~~-water is the universal one
-polar water molecules will surround the (+) and (-) ions causing the ions to separate
and dissolve
-dissolve solutes and create aqueous solutions
hydrophilic
✓ ~~~-some molecules have an affinity for water
-polar and ionic molecules
-ex: cotton, cellulose, paper
hydrophobic
✓ ~~~-some substances do not have an affinity for water
-nonpolar and non ionic substances
-ex: fat, glycerol, oils
floats
✓ ~~~-less dense when it is solid, water ______
-forms crystal lattice structure
-important because oceans and lakes do not freeze solid
~insulates water below
~seasonal turnover of lakes
, specific heat
✓ ~~~-the amount of heat that must be absorbed or lost for 1g to change its temperature by
1C
-water had high _____ due to H bonding
-resists change in temp
-moderates temp on earth
evaporative cooling
✓ ~~~-organisms use to regulate their temperature
-ex: sweating
-water evaporates through a surface, cooling occurs
acidic
✓ ~~~If [H+]>[-OH]
basic
✓ ~~~If [-OH]>[H+]
pH scale
✓ ~~~-how acidic or basic a solution is
-pure water, only 1 molecule in every 554 million is dissociated
-most biological fluids have 6-8
-each unit represents a 10-fold difference in H+ and -OH concentrations
