The end of the semester is tiring – hang in there! Be respectful – no electronics please! Announcements The end of the semester is tiring – hang in there! Exam 3 is on Thursday April 25 at 7:00 pm! (Conflict at 5:00 pm) Sign up for conflict in 1026 CA Please let me know by this Thursday about conflicts to the conflict Lab due Friday in discussion Lon-Capa HW 7 due tomorrow 10:00 pm Pre-lecture assignments due Tuesdays & Thursdays at 8 am as usual Workshop 2 due Monday at beginning of Lab
Chem 101: Last 4 Weeks Calendar Monday Tuesday Wednesday Thursday Friday 8 9 10 11 12 15 16 17 18 19 22 23 24 25 26 29 30 1 2 3 6 7 Today Exam 3 Reading Day 101A Final
Overall goal: Atomic Structure Chemical Bonding 3D Molecular Structure Molecular Properties
Overall goal: Atomic Structure Chemical Bonding 3D Molecular Structure Molecular Properties
Clicker #1 We drew the Lewis structures for BF3 and NF3. What are the molecular shapes of each of these molecules? BF3 NF3 a) Trigonal planar Trigonal pyramid b) Tetrahedral c) d) e)
Clicker #2 The correct Lewis structure for IF3 has ____ lone pairs around the central atom. a) 0 b) 1 c) 2 d) 3 e) 4
Joke Is helium male? Of course He is!
Five Effective Pairs: Trigonal Bipyramid Geometry T-shape Trigonal bipyramid See-saw Linear
See-saw
Six Effective Pairs: Octahedral Geometry Square pyramid Square planar Octahedral
Octahedron
Clicker #3 a) 1 & 2 b) 1 & 3 c) 1 & 4 d) 1 & 5 e) 1 & 6 Where would it be best to place the chlorine atoms in SF4Cl2 to make this a nonpolar molecule? a) 1 & 2 b) 1 & 3 c) 1 & 4 d) 1 & 5 e) 1 & 6
Clicker #4 What are the bond angles around the carbon and oxygen atoms in CH3OH? Carbon Oxygen a) 90 180 b) 107 c) 109.5 d) 104.5 e) 120