CH10 Flashcards
Bond angles
determine molecule shape
VSEPR
Valence Shell Electron Pair Repulsion
when covalent forms and e- are shared the space is called…
e- domain (geometry)
2 electron domains
Linear
3 domains
trigonal
4 domains
tetrahedral
5 domains
trigonal bi-pyramidal
six domains
octahedral
molecular geomerty
arrangement of e- in space
To determine shape of a molecule distinguish between
lone pairs and bonding pairs
C bond angle
109.5
N bond angle
107
O bond angle
104.5
3 atoms
- linear
- bent
4 atoms
- trigonal planar
- trigonal pyramidal
- T shaped
5 atoms
- tetrahedral
- square planar
- seeSaw
6 atoms
trigonal bi-pyramidal
- square pyramidal
7 atoms
Octahedral
trigonal bi-pyramidal
in plane called equatorial (120 deg. apart)
N/ S are axial (180 apart and 90 from each other )
Octahedron
4 pairs in plane are 90 from one another and axial are 180 apart and 90 to the plane
bonds in polyatomic molecules are
dipole bonds
CO2 dipole is cancelled
because it is linear
H20 dipole is not cancelled
because molecule is bent
trigonal pyramidal
yes dipole
trigonal planar
no dipole unless ‘b’ molecule is different
shared region of space between orbitals in covalent bond is
orbital overlap
F-Be-F bond angle
180
trigonal bi-pyramidal
sp3d
octahedral
sp3d2
Sigma bonds
- single bonds w/ e- density along the axis
Pi Bonds
e- density above & below nuclei
- double bond = 1 sigma and one pi
- Triple = one sigma and 2 pi
