Lecture 10 - Chemical Bonding 4

Question 1

what is metallic bonding?

Answer 1

the electrostatic attraction between metal ions and mobile delocalised electrons

Question 2

what are two requirements for metallic bonding?

Answer 2

• the metal should have low ionisation energies

- metal should have vacant valence orbitals

Question 3

give 5 characteristics of metals

Answer 3

• great strength
• good conductors
• malleable
• ductile
• lustrous

Question 4

what are intramolecular forces?

Answer 4

forces that hold atoms together within a molecule

Question 5

what are intermolecular forces?

Answer 5

attractive forces between molecules

Question 6

what are the 4 intermolecular forces and give them in order of strongest to weakest

Answer 6

1. ion dipole
2. hydrogen bonds
3. dipole -dipole forces
4. London dispersion forces (VDW)

Question 7

Describe dipole dipole forces

Answer 7

relate to permanent molecule dipoles, found in binds with an electronegativity difference and require a non-uniform charge difference

Question 8

Describe ion dipole forces

Answer 8

electrostatic interaction between an ion and an uncharged polar molecule in which strength depends on charge of the ion and magnitude of the dipole

Question 9

Describe ice

Answer 9

each water molecule is hydrogen bonded to 4 others in a tetrahedral formation