Intermolecular Forces Flashcards
When do IMF occur?
between different molecules
What are atoms held together by?
Shared pairs of electrons (covalent bonds)
How are the molecules attracted to eachother?
By weaker IMF
What are the 3 types of IMF?
Hydrogen boding
Permanent dipole dipole
London forces
What are London forces?
Temporary, induced dipole-dipole forces
Non-polar molecules
Present in all molecular substances
When do London forces occur?
The electrons are constantly moving around and there is an uneven electron distribution- causes a temporary dipole
Are London forces strong?
No- they are the weakest IMF
How does the strength of London forces increase by?
The number of electrons in the molecule/atom increases
The surface contact of the molecules/atoms increases
When does PD-PD occur?
Between polar molecules e.g. between HCL molecules
Do very small differences in electronegativity produce significant dipoles?
No
