Water

Question 1

Roles of water in the human body

Answer 1

• reactant, intermediate: eg hydrolysis or in AB rxns
• shock absorber
• lubrication: reduce friction
• regulate Tb
• maintain cell shape

Question 2

Link the characteristics of water w/ its properties

Answer 2

2 LP on O + 2 polar ends (H) = 4 H bonds per H2O molecule
=> High MP (>100C) & BP (>200C)
=> High surface tension
=> Density (l) > (s)
=> expands when frozen

Question 3

Types of non-covalent interactions w water

Answer 3

• H bond, dipole-dipole, dispersion interactions
• hydrophobic interactions
• ion-dipole
• dipole-induce dipole (water can induce dipole in other non-polar molecules

Question 4

What does amphoteric mean when referring to water?

Answer 4

Water can act as an acid or base