Chapter 3

Question 1

polarity of water

Answer 1

water molecules are polar and hydrogen bond to other water molecules(up to 4).

Question 2

cohesion

Answer 2

the manner in which water moves as a unit. its why water can move against gravity in plants

Question 3

surface tension

Answer 3

the invisible “film” that water molecules have caused by cohesion

Question 4

temperature moderation

Answer 4

water has a high specific heat.

Question 5

density of ice

Answer 5

water is less dense as a solid than a liquid. this is why ice floats instead of sinks. hydrogen bonding keeps molecules spaced apart when water freezes

Question 6

hydrophilic

Answer 6

likes water, polar molecules

Question 7

hydrophobic

Answer 7

doesn’t like water, nonpolar molecules

Question 8

dissociation of water

Answer 8

H2O <-> H+ + OH- (is very uncommon)

Question 9

hydronium ion

Answer 9

H3O+

Question 10

Hydroxide ion

Answer 10

OH-

Question 11

acids

Answer 11

increase the hydrogen ion concentration of a solution. donate hydrogen ions to the solution (HCl<-> H+ +Cl-)

Question 12

Bases

Answer 12

reduce hydrogen ion concentration of a solution. accept the hydrogen ion (NH3+ H+<-> NH4+)

Question 13

pH

Answer 13

Quantified ion concentration of a solution. pH=-log [H+]. perfect range 6-8for biological processes

Question 14

buffers

Answer 14

substance that minimize changes in pH