Intermolecular Forces Flashcards
1
Q
what is hydrogen bonding?
A
intermolecular bonding between molecules contains N, O or F and the hydrogen atom
2
Q
what are the types of intermolecular forces?
A
- induced dipole-dipole forces (London forces)
- permanent dipole-dipole forces
- hydrogen bonding
3
Q
which of the intermolecular forces are the weakest?
A
induced dipole-dipole forces
4
Q
what are permenant dipole-dipole interactions(van der Waals)?
A
there is a weak electrostatic force of attraction between the delta positive and delta negative molecules
5
Q
what are the anomalous properties of H2O?
A
- liquid water is denser than solid
- its relatively high melting and boiling points
6
Q
what are the anomalous properties of H2O based on?
A
results from hydrogen bonding between water molecules
7
Q
why is ice less dense than water?
A
- hydrogen bonds hold water molecules in solid ice in an open lattice structure
- water molecules are held apart in ice by hydrogen bonds
- solid ice is therefore less dense than water and floats
8
Q
why does water have a relatively high mp and bp?
A
- water has relatively strong hydrogen bonds which need to be broken
- lots of energy is required to overcome these hydrogen bonds
9
Q
why is hydrogen bonding able to occur?
A
lone pairs on the N,O or F
