3.1.7 Water

Question 1

Properties of water

Answer 1

• metabolite in metabolic reactions
• good solvent
• relatively high heat capacity
• relatively large latent heat of vaporisation
• strong cohesion between water molecules
• water is less dense as a solid
• transparent to light

Question 2

Properties of water

metabolite in metabolic reactions

Answer 2

e.g. hydrolysis, condensation

Question 3

Properties of water

good solvent

Answer 3

• can dissolve polar substances

e. g. O2, CO2, ATP, amino acids (hydrophilic)

Question 4

Properties of water

relatively high heat capacity

Answer 4

-water absorbs/loses a lot of heat before its temperature changes
└lot of energy to break H bonds
-can buffer temp changes ion habitats

Question 5

Properties of water

relatively large latent heat of vaporisation

Answer 5

-water absorbs a large around of energy before turning into water vapour
=cooling effect with little loss of water through evaporation

Question 6

Properties of water

strong cohesion between water molecules

Answer 6

attraction between particles of the same substance

• allows unbroken columns of water to rise up the xylem as a result of transpiration
• produces surface tension where water meets air

Question 7

Water bonding

Answer 7

Hydrogen bonding

-slightly positive hydrogen attracted to slightly negative oxygen