Lecture 3 Water and pH

Question 1

Molecular weight of water

Answer 1

18.0 Dalton (g/mol)

Question 2

Density of water at 4 degrees C

Answer 2

1.00 g/mL

Question 3

Density of ice

Answer 3

0.917 g/cm3

Question 4

boiling point of water

Answer 4

100 degrees C

Question 5

freezing point of water

Answer 5

0 degrees C

Question 6

How many hydrogen bonds do water molecules in ice form?

Answer 6

4 hydrogen bonds

Question 7

how many hydrogen bonds do water molecules in liquid water form?

Answer 7

3.4 hydrogen bonds

Question 8

Specific heat capacity of water?

Answer 8

high

Question 9

Does water’s heat capacity make it resistant or susceptible to temperature changes?

Answer 9

resistant

Question 10

What are substances that can mix and interact with water? (water-loving)

Answer 10

hydrophilic substances

Question 11

What are nonpolar substances that repel bodies of water and attract other neutral molecules called?

Answer 11

hydrophobic substances

Question 12

hydrophobic effect

Answer 12

the exclusion of nonpolar substances from an aqueous solution

Question 13

normal blood pH

Answer 13

7.35-7.45