Chem 2.2B: VSEPR Theory

im gonna fail the english essay

Tell me about Covalent Bonds

Every covalent bond is characterized by two values:

• Bond length: the distance between bonded nuclei

• Bond strength: the amount of energy needs to break the bond. It is also called bond enthalpy

In general, shorter bonds are stronger bonds

Tell me about Multiple Bonds

Atoms, can share more than one pair of electrons to form multiple bonds.

• double (2 pairs of electrons)

• triple (3 pairs of electrons)

Multiple bonds have a greater number of shared electrons and so have a greater force of electrostatic attraction between the bonded nuclei

Give me the order of bond length in from strongest to longest

Shortest | 3-bond<2-bond<1-bond | Longest

Give me the order of bond enthalpy in from strongest to longest

Lowest | 1-bond<2-bond<3-bond | Highest

What does VESPR mean? Tell me about it

Valence Shell Electron Pair Repulsion

• electrons I covalent bonds and in lone pairs repel one another

• Molecules have 3D shapes that place electron pairs on central atom as far apart as possible

• involve electron domains

They depend on:

1. The number of atoms bound to the central tom

2. The number of lone pairs of electrons on the central atom

Tell me about Electron Domains

• can contain single, double or triple bonding electron pairs or non-bonding pairs of electrons

• Total number of electron domains determine the geometric arrangements of electron domains

• lone pairs of electrons have a higher concentration of charge and so have slightly more repulsion than bonding pairs