Chapter 1: 1.3 VSEPR Theory Flashcards
1
Q
What does VSEPR stand for?
A
Valence-Shell Electron-Pair Repulsion (VSEPR) Theory
2
Q
The geometry and shape of an atom in a molecule is dictated by the atom’s…
A
Hybridization
* Number of σ-bonds and π-bonds
3
Q
True or False:
Lone pairs of electrons occupy space
A
True
4
Q
What are the “magical numbers” in organic chemistry regarding geometry and shape?
A
- 109.5 degrees (around sp3 atoms)
- 120 degrees (around sp2 atoms)
- 180 degrees (around sp atoms)
5
Q
Why are atoms sometimes force to adopt a less-than-ideal geometry?
A
Due to presence of a ring
* Explains why five- and six-membered rings are more stable than smaller and larger analogues
6
Q
What effect do lone pairs have on VSEPR theory?
A
Lone pairs occupy space similar to atoms
* Repulsion is greater than other electron pairs
* Makes “perfect angles” less perfect
