Intermolecular Forces

Question 1

When are polar bonds cancelled out?

Answer 1

When the molecule is symmetrical

Question 2

What are the 3 types of intermolecular forces?

Answer 2

Van see waals
Permanent dipole- dipole
Hydrogen bonding

Question 3

Explain what van der waals are and what they mean

Answer 3

Electron charge clouds electrons are more likely to be in one area to another so attract. Always created and destroyed but over all they are attracted. Larger molecules larger van der waals
Shape effects them
Liquids with stronger van der waals will have higher melting points

Question 4

Explain what hydrogen bonds are?

Answer 4

Only happens when hydrogen bonded to nof atoms

Cos v electronegative

V strong

High melting points

Ice hydrogen bonds in regular lattice so further apart so ice less dense

Question 5

What is meant by a polar molecule?

Answer 5

Different electronegatives between two atoms pull the electrons towards the more electronegative atom