A1.1.2 STRUCTURE/POLARITY OF H2O MOLECULES

Question 1

State the molecular structure of H2O molecules

Answer 1

• Polar molecules (Dipole)
• Contains polar covalent bonds between O & H2
• A dipole as a result of the diff. in electroneg. & polar covalent bonds
  – visuals in notes –

Question 2

More details abt the molecular structure of H2O molecules

Answer 2

• Unequal distribution of charges

Question 3

Properties of H2O molecules

Answer 3

• Has weak attractions with other polar molecules
• Can form H-bonds with F, N & O
  → Bc of the huge electroneg. diff.
  – visuals in notes –

Question 4

What is electroneg.?

Answer 4

• the tendency of an atom to attract electrons
  → influenced by the # of protons in the nucleus
  → influenced y # of orbital levels (↑ orbital levels = ↓ electroneg. – shielding effect)

Question 5

Properties of H2O

Answer 5

• Thermal Properties:
  → ↑ SHC (requires breaking of H-bonds)
• Cohesive/Adhesive Properties:
  → Stick to H2O molecules (Cohes.)
  → Stick to other polar molecules (Adhes.)
• Solvent:
  → Dissolves polar & ionic substances
  → Forms competing polar associations to draw materials apart
  → H-bonds r generally stronger than other polar associations