chapter 2 water

Question 1

what does the reactivity of many functional groups depend on

Answer 1

pH

Question 2

covalent bond example

Answer 2

o-h
C-H
C-C

Question 3

what is the rough bond strength of a vovalent bond

Answer 3

460 round to 500

Question 4

what is an example of a ionic interaction bond and whaqt is its bond strength

Answer 4

-COO- or NH3+
86 round to 90

Question 5

hydrogen bond example + strength

Answer 5

O-H-O
20

Question 6

dipole dipole interaction

Answer 6

C=O
9.3

Question 7

london disperson or van der waals

Answer 7

C-H…H-C 0.3

Question 8

what is the order of strongest to least strongest bond

Answer 8

covalent
ionic interaction
hydrogen
dipole dipole
london dispersion

Question 9

for this class never draw H to what

Answer 9

H that bonds to C like C-H

Question 10

what is the shape of ice

Answer 10

hexagonally packed (honeycomb shape)
satisfies the H bonding potentinal

Question 11

liquid water is denser than

Answer 11

ice

Question 12

what is one of the most polar solvents around

Answer 12

waterwha

Question 13

what is water an excellent solvent for

Answer 13

charged and polar species
- ions

Question 14

what is water a poor solvent for

Answer 14

nonpolar solutes: oil and water don’t mix

Question 15

what happens when a small ampunt of nonpolar solute gets immersed inwater

Answer 15

hydrophobic effect: nonpolar solutes aggregate and clump together to minimize their contact with the polar solvent

Question 16

is hydrophobic effect an increase or decrease in entropy

Answer 16

first an increase in order of water molecules = decrease in entropy
ds= -ve which is unfavorable

Question 17

what drives hydrophobic effects / interaction

Answer 17

overall increase in entropy that water molecules achieve by excluding a nonpolar solute

Question 18

what does amphillic molecule mean

Answer 18

both polar and nonpolar groups
Fatty acids or sodium dodecy sulfate (SDS)

Question 19

what is micelle formation driven by

Answer 19

entropy