hydrogen bonding and water

Question 1

water has unique properties

Answer 1

molecule has no overall charge

oxygen atom carries slight negative charge

hydrogen atoms carry slight positive charges

polarity attracts them to one another

Question 2

what has no overall charge?

Answer 2

molecules

Question 3

what atom carries slight negative charge?

Answer 3

oxygen

Question 4

what atoms carry slight positive charges?

Answer 4

hydrogen

Question 5

what attracts them to one another?

Answer 5

polarity

Question 6

what is a hydrogen bond?

Answer 6

an attraction between a covalently bonded hydrogen atom and another atom taking part in a separate polar covalent bond

Question 7

is a hydrogen bond a chemical bond?

Answer 7

not a chemical bond

Question 8

what does a hydrogen bond form?

Answer 8

a hydrogen bond forms and breaks more easily than covalent or ionic bonds

Question 9

is a hydrogen bond weak or strong?

Answer 9

a hydrogen bond is collectively quite strong

Question 10

what gives liquid water special properties?

Answer 10

extensive hydrogen bonding

makes life possible

Question 11

water is an excellent solvent that allows other substances to do what?

Answer 11

dissolve in it (water)

Question 12

what are the 2 special properties of water?

Answer 12

hydrophilic and hydrophobic

Question 13

hydrophilic

Answer 13

water-loving

hydrophilic substances dissolve easily in water

Question 14

what’s a solution?

Answer 14

a uniform mixture

Question 15

what’s an example of a solution?

Answer 15

salt dissolved in water

Question 16

what may vary in a solution?

Answer 16

proportions of substances

Question 17

hydrophobic

Answer 17

water-dreading

Question 18

do hydrophobic substances interact with water?

Answer 18

no, hydrophobic substances do not interact with water

Question 19

what’s an example of something hydrophobic?

Answer 19

oils

Question 20

what is concentration?

Answer 20

the amount of solute dissolved in a given fluid amount

Question 21

what is cohesion?

Answer 21

hydrogen bonds collectively exert a continuous pull on individual water molecules

Question 22

cohesion plays a role in what?

Answer 22

surface tension

Question 23

what is evaporation?

Answer 23

water molecules escape from liquid water surface as vapor

Question 24

what is evaporation resisted by?

Answer 24

hydrogen bonding

Question 25

cohesion of water molecules provides what that enables an insect to be able to walk on water?

Answer 25

surface tension

Question 26

what is temperature?

Answer 26

the measure of the energy of motion of atoms & molecules

Question 27

what stabilizes temperature?

Answer 27

water

Question 28

what keeps water molecules from moving as much as they would?

Answer 28

hydrogen bonding

Question 29

what is the important part of homeostasis?

Answer 29

temperature stability

Question 30

what is temperature stability?

Answer 30

molecules of life function within certain range of temperature

Question 31

what molecules pack less densely on ice than they do in water; reason why ice floats on water?

Answer 31

individual water molecules