VSEPR
What does VSEPR stand for?
Valence shell electron pair repulsion.
H2
Linear, 1800
What is the shape of an s orbital
Spherical
What is a dipole?
Equal but opposite charges on a molecule.
What causes london dispersion force?
Momentary dipoles.
What is VSEPR theory based on?
Electron pairs will repel each other as far apart as they possible can.
BeF2
Linear and 1800
What is the shape of a p orbital
Dumbell.
What is a dipole-dipole force.
The forces of attraction between polar molecules.
What are London Dispersion forces?
Momentary intermolecular attractions.
What is true about unshared electron pairs compared to shared electron pairs?
Unshared electron pairs repel more than shared electron pairs.
Double: Why
BF3
Trigonal planar 109.5
If there are four orbitals around a central atom, what is the hybridization?
sp3
Double: If there are two orbitals around a central atom what is the hybridiaztion?
What are the highest dipole molecules?
Why do London Dispersion Forces occur?
London Dispersion Forces occur because of the constant motion of electrons.
What is the geometry of a AB and a AB2 Molecule?
Linear.
Double What is AB2E
H2O
Bent Less than 1090
Which is the shortest hybrid orbital and why?
An sp orbital is the shortest, because the spherical is 50% and s orbital is shorter than than the p orbital. For instance the sp3 orbital is 25% s and 75% p.
What does the direction of the arrow mean in a dipole?
The arrow points towards the negative pole of the molecule.
Which noble gases has highest London Dispersion Force?
He
What is the geometry of an AB3 molecule?
Trigonal planar.
double: AB4
Cl03-
Trigonal pyramidal
Why do hybridization of s and p orbitals occur.
The s orbital is shorter than the p orbital and would not be symmetric.
What are higher dipolar forces responsible for?
Higher dipolar forces are responsible for higher boiling points.
What causes London Dispersion forces to decrease?
Increasing atomic radii.