Molecules and Materials

Question 1

What is a Coordination Number

Answer 1

number of atoms or ions immediately surrounding a central atom in a complex

Question 2

WHats the difference between the formation of the conduction band and valence band

Answer 2

A valence band is formed by bonding orbitals , Conduction band formed from anti-bonding orbitals

Question 3

How do you form bonding orbitals and antibonding orbitals

Which one is higher in energy

Answer 3

Bonding - in-phase combinations of atomic wave functions

Antibonding - out of phase combinations of atomic wave functions

Conduction band - above valence e-

Valence band below valence e-

Question 4

The Type of solid depends on the…

Answer 4

size of the band gap between the valence band and conduction band

Question 5

Describe London Dispersion Forces

Answer 5

Instantatnoius Dipole-induced dipole forces

Very weak

Common to all molecules

Question 6

Describe Dipole-Dipole Forces

Answer 6

Weak forces

Based off permanent dipoles

+ve dipoles are attacted to negative dipoles

Question 7

Describe Hydrogen Bonding

Answer 7

Strong form of Dipole-Dipole Interactions

Between H and lone pairs of highly electronegative elements F ,O ,N

Much Weaker then Covalent Bonds

Resposnible fro liquid and solid water strucutre , DNA DBL helix

Question 8

Compare the mobility of liquids and solids

Answer 8

Liquids have a greater mobility

Greater Kinetic Energy of particles

Wekaer intermolecular interactions

Question 9

Whats the definition of a polymer

Answer 9

Made of many repeating units of a monomer

Question 10

Whats the formula for Degree of Polymerisation

Answer 10

How many Repetions of the monomer are there

Polymer Molar mass / Monomer Molar mass

Question 11

What is condensation polymerisation

Answer 11

Production of a polymer and a lone water molecule (or HCl), from reacting two monomers together,