Chapter 3: Water & Life

Question 1

Water molecule has what kind of bond

Answer 1

covalent

Question 2

4 emergent properties of water

Answer 2

cohesive behavior
ability to moderate temp
expansion upon freezing
versatility as solvent

Question 3

Cohesion

Answer 3

H bonds hold the water molec together
helps transport of water against gravity in plants

Question 4

Surface Tension

Answer 4

measure of how hard it is to break the surface of a liquid
(related to cohesion)

Question 5

Moderation of Temp

Answer 5

water can absorb large amts of heat with slight change to its own temp

Question 6

Heat

Answer 6

measure of total amt of KE bc of molecular motion
(measured in calories)

Question 7

Temp

Answer 7

measures intensity of heat bc of average KE in molecules
(measured in Celcius)

Question 8

Specific Heat

Answer 8

amt of heat that must be absorbed/lost for 1 gram of substance to change its temp by 1 C

Question 9

heat is ____ when H bonds break

Answer 9

absorbed

Question 10

heat is ____when H bonds form

Answer 10

released

Question 11

heat of evaporation

Answer 11

heat a liquid must absorb for 1g to be converted to gas

Question 12

Evaporative Cooling

Answer 12

as liquid evaporates, the remaining surface cools

Question 13

Insulation

Answer 13

ice floats in liquid water bc H bonds in ice are more “ordered” => ice is less dense

Question 14

Solution

Answer 14

liquid that is a homogenous mixture

Question 15

Solvent

Answer 15

dissolving agent of a solutinon

Question 16

Solute

Answer 16

substance that is dissolved

Question 17

water is a good solvent bc of its polarity

Answer 17

forms H bonds really easily

Question 18

T/F: Water can dissolve all solutes

Answer 18

False

Question 19

adding bases & acids modifies the concentration of

Answer 19

H+ and OH- ions

Question 20

Acid

Answer 20

substance that increases the H+ concentration of solution (low pH)

Question 21

Base

Answer 21

substance that reduces the concentration of H+ solution (high pH)

Question 22

Buffers

Answer 22

substances that minimizes changes in concentration of H+ & OH- in a solution