Chemistry 11 Friday, September 22, 2006

Chemistry 11 Friday, September 22, 2006 - Point 180 degrees...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Friday, September 22, 2006 Chemistry GET IN SHAPE What shapes do molecules have? What orbitals do bonding e- reside in? Text 6.0-6.1:.3-6.4(Part) VSEPR Theory 1. Valance shell election pair repulsion a. Misnomer: electron group (not pair) b. e- groups get as far apart as possible Lone pairs single bonds Double bonds triple bonds 2. Depends on # of e- groups a. (get from Lewis structure) 2 e- groups 180 degrees 3 e- groups 120 degrees 4 e- groups 109 degrees 3. VSEPR tells where e- groups go “shape of molecule” a. Describes where the atoms are CO 2 SO 2 H 2 O O C O = 2 O S O = 3 H O H = 4 180 degrees 120 degrees 109 degrees Linear Bent Bent Page 108 and 109 4. often, bond angles slightly less than predicted a. lone pairs take up more room than bonding pairs
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Friday, September 22, 2006 HYBRID ORBITALS 1. Basic idea in bonding (valence Bond Theory) 2. Best bonding comes from orbitals that point toward one another bond 3. Atoms can use plain atomic orbitals but for 120 degrees, s or p not pointed in right directions 4. Take math combinations of s and p - s + one p = sp hybrids
Background image of page 2
Background image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Point 180 degrees apart (two plain p left over)-s + two p = sp 2 hybrids point 120 degrees apart (one plain p left over)-s + three p = sp 3 hybrids point 109 degrees apart (no ps leftover) C: sp S: sp 2 H20: sp 3 ) these go with shapes on page 1 SO 3 NH 3 CH 4 O S O H N H H O H H C H H 120 degrees 109 degrees 109 degrees Bent Bent Bent sp 2 sp 3 sp 3 Trigonal Trigonal Tetrahedral Planer Pyramidal Friday, September 22, 2006 LARGER MOLECULES 1. You can describe the shape and hybridization at any atom in a molecule 2. #e-groups bond angle hybridization 2 180 degrees sp 3 130 degrees sp 2 4 109 degrees sp 3 3. Love pairs are often not shown must add assume octets Fig 6.7 H O # e-groups: 4 3 4 Bond angle: 109 deg 120 deg 109 deg H C C O H shape: tetrahedral trig planer bent Hybrid: sp 3 sp 2 sp 3 H Figure 6.8 and 6.9 GOALS Determine the following at any atom in a molecule o Bond angle o Shape o Hybridization...
View Full Document

Page1 / 3

Chemistry 11 Friday, September 22, 2006 - Point 180 degrees...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online