Intermolecular Bonding Flashcards
How strong are Intermolecular Bonds?
They are weak when compared to Ionic and Covalent bonds.
What are the 3 types of Intermolecular Forces?
Hydrogen Bonds
Permanent dipole-dipole forces
Van Der Waals forces
How strong are Hydrogen bonds compared to Ionic and Covalent?
They are 20x weaker.
How strong are Dipole-Dipole forces compared to Ionic and Covalent?
They are 100x weaker.
How strong are Van Der Waals forces compared to Ionic and Covalent?
1000x weaker
What sort of intermolecular forces occur between polar molecules?
Permanent dipole-dipole forces and Van der waals
Between what sort of molecules does dipole-dipole forces happen?
Between polar molecules
What sort of forces exist in non-polar molecules?
Van der waals
In what sort of molecules do Van der waals forces occur between?
All molecules have van der waals forces
Define an Intermolecular force.
An intermolecular force is an attractive force between neighbouring molecules
Define a permanent dipole-dipole force.
A permanent dipole-dipole force is a weak attractive force between permanent dipoles in neighbouring polar molecules.
Define a Van der Waals force.
Van der Waals forces are attractive forces between neighbouring molecules caused by induced dipoles.
What is an instantaneous dipole?
An instantaneous dipole is the areas of high and low concentrated negative chard caused by the movement of electrons.
What is an induced dipole?
An induced dipole is a polar region where there is more or less negative charge caused by electrons because of the repelling effect of an instantaneous dipole.
What causes Van der Waals forces?
The movement of electrons creates instantaneous dipoles, which induce induced dipoles. The induced dipoles are then attracted to each other, creating a small force.
