Properties Of Water

Question 1

Polar molecule

Answer 1

• dipole moment
• asymmetrical

Question 2

Excellent solvent

Answer 2

• likes dissolve likes (because of hydrogen bonding and great En difference)
• ionic compounds become (aq) and will disassociate
• small non polar molecules dissolve (O2 in H2O, CO2 in H2O)
• polar and nonpolar remain separate

Question 3

Hydrogen Bonds

Answer 3

• occur between h, n, o, and f
• constantly forming and breaking in a liquid
• responsible for cohesion and adhesion
• the strength of H2 bonds causes SURFACE TENSION

Question 4

Why does H2O have meniscus

Answer 4

• H2O is being pulled up

Question 5

Adhesion:

Answer 5

• attracted to polar molecules
• Dipole dipole
  -Capillary action ( caused by hydrogen bonds and air pressure H2O level increases in straw )

Question 6

Cohesion

Answer 6

• water sticks to itself,
  -hydrogen bonds = surface tension
• the less stuff in water = greater film

Question 7

High Specific Heat

Answer 7

(Just the graph,
m=0 where energy is breaking H2 bonds when states are changing)

Tremendous heat and energy in water vapour

Question 8

High freezing point

Answer 8

• can hold and absorb lots of energy
• H+ bonds absorb lots of energy

Question 9

Dissociation

Answer 9

• H2O exists as a balance of OH and H or hydronium
• adding acids and based disrupts equilibrium and modifies H and OH

Question 10

Density

Answer 10

• less dense as a solid (density anomaly)
• solid frozen water forms a crystal lattice H2 bonds get more stable (act as an ionic compound)
• each H2O is H bonded to 4 others (MAX)