1.3.6,1.3.7,1.3.8: Intermolecular forces & metals

Question 1

Sea of free electrons in metals

Answer 1

Valence electrons delocalise and can move about the entire material

Question 2

Electrical conductivity of metals

and why

Answer 2

good

free electrons can move and carry current - ‘charge carriers’

Question 3

Melting point of metals

Answer 3

related to the metals group

Question 4

Intermolecular forces

Answer 4

forces between molecules

Question 5

Three types of intermolecular forces

Answer 5

van der waals
permanant dipole-dipole forces
hydrogen bonds

Question 6

Van der waals

Answer 6

Weakest type of intermolecular force.
Electrons in charge clouds move quickly = changes in electron density = temp. dipoles = induce temp. dipoles in nearby molecules

Question 7

Permanent dipole-dipole forces

Answer 7

Weak electrostatic forces of attraction between + and - partial charges on neighbouring molecules

Question 8

Hydrogen bonds

Answer 8

Strongest intermolecular force which occurs when hydrogen is bonded (covalently) to F,N or O.

Question 9

Van der waal strength is dependent on

Answer 9

size of charge clouds

larger = stronger