IB Biology: Level 10 - Water 2.2

Question 1

Are water molecules polar or non polar?Do hydrogen bonds form between them?

Answer 1

Water molecules are polar.Yes

Question 2

Hydrogen bonding and dipolarity explain what 4 properties of water?

Answer 2

adhesive, cohesive, thermal, and solvent properties -hydrophilic
water-loving; polar
hydrophobic
insoluble in water; nonpolar

Question 3

Water is-

Answer 3

polar covalent bonds between hydrogen and oxygen

Question 4

How is a water molecule formed?

Answer 4

A water molecule is formed by polar covalent bonds between an oxygen atom and two hydrogen atoms.

Question 5

What is the charge of hydrogen atoms in water?

Answer 5

Partial positive charge

Question 6

What is the charge of the oxygen atom in water?

Answer 6

Partial negative charge

Question 7

What is the shape of a water molecule?

Answer 7

Bent

Question 8

Intermolecular forces

Answer 8

hydrogen bonds

Question 9

“hydrogen bond”

Answer 9

Attraction between water moleculesforce that forms when a hydrogen atom in a polar molecule is attracted to a slightly negative atom of another polar covalent molecule

Question 10

Cohesive property

Answer 10

binding of 2 of the same molecules

Question 11

Example of cohesive property

Answer 11

water transport in plants; water molecules are not separated in xylem

Question 12

Adhesive properties

Answer 12

binding of two different molecules

Question 13

Example of adhesive property

Answer 13

In leaves water adheres to cellulose fibers; keeps cell walls moist so CO2 can be absorbed

Question 14

Thermal properties

Answer 14

• High specific heat capacity
• High latent heat of vaporization
• High boiling point

Question 15

Specific heat capacity

Answer 15

amount of heat energy needed to raise the temperature of water by 1°C

Question 16

Heat of vaporization

Answer 16

amount of heat needed to convert water from a liquid phase to a gaseous phase

Question 17

Solvent

Answer 17

a substance that is able to dissolve other substances; “like dissolves like”

Question 18

Sweat is controlled by the

Answer 18

hypothalamus

Question 19

Other cooling methods that use water

Answer 19

Panting in dogsTranspiration in plants

Question 20

Ions in blood plasma being transported

Answer 20

Sodium chlorideAmino acidsGlucoseOxygenFatsCholesterol

Question 21

Hemoglobin in red blood cells

Answer 21

ensures enough oxygen is carried in blood