Polarity / Electronegativity + Intermolecular Forces + Hydrogen Bonding

Question 1

Define Electronegativity

Answer 1

The ability of an atom to attract the bonding pair of electrons in a covalent bond

Question 2

How does London Dispersion Forces Arise

Answer 2

-Constant random movement of electrons
-Uneven distribution of electrons
-Creates an Instantenous Dipoles
-Which causes a induced dipole in neighbouring molecules

Question 3

Why does Br-Br have a higher melting point / boiling point Cl-Cl

Answer 3

The higher number of electrons
The stronger London dispersion forces
Which require more energy to overcome

Question 4

Name 2 Anomalous Properties of Water

Answer 4

Ice is less dense than Water
-In a solid state H2O Molecules are held apart by hydrogen bonds
-Ice has an open lattice

Water has a relatively high MP and BP
-More energy is required to overcome the bonds

Question 5

What is the description of a Polar Molecule

Answer 5

-X is more electronegative ( delta negative ) than x ( delta positive )
- X is not symmetrical
-The dipoles in the don’t cancel
-

Question 6

What is the description of a Non-Polar Molecule

Answer 6

-X is more electronegative ( delta negative ) than x ( delta positive
- X is symmetrical
-The dipoles in the molecule cancel