11/19/2012 Standards: 1 (Str of Atom) and Objectives: 2 (Chem Bonds)a. Test for understanding – Std 1 – Structure of the Atomb. Be able to draw at least 1 Lewis Structure for a covalent molecule DO NOW: Get responders, after stamping, Clear desks of everything
HOMEWORK: 1. ChemThink.com - Covalent Bonding Tutorial & Questions (15 points)
Std 2 (due tonight, midnight) 2. HANDOUT - Polarity in Bonds vs Polarity in Molecules - Use this handout to
draw Lewis Structures for these molecules: CO2 F2O H2O H2S HCN (5 pts) Std 2===========================================================BASKET: Journal 11/16 1. Page 244 PP's 1-5 (Lewis Structures) (5 pts) Std 2
RESPONDERS
except: responders, blank paper (headed Std 1 Quiz Notes), pencil
Std 1 Quiz tomorrow - 40 pts
formula
Lewis Structure
H H
OH2O
H2
O
Total
Unshared
bonding
Atoms Valence Electrons
A bonding pair of electrons =
Check 2 things to have a correct Lewis Structure1. Every atom in molecule has 8 electrons except H (only needs 2)2. Total electrons in Lewis Structure = total of all valence electrons
from the individual atoms.
Lewis Structures For Covalent Molecules Std 2
Moleculeformula
1
Start Lewis Strwithout electrons
2
Redraw &connect atomswith bonding pairs
3
Calculate total valence electronsand subtract bonding electrons
4
Check step1. all have 8 except H Be B 2 4 62. TOTAL electrons correct
5
`
Moleculeformula
1
Start Lewis Strwithout electrons
2
Redraw &connect atomswith bonding pairs
3
Calculate total valence electronsand subtract bonding electrons
4
Check step1. all have 8 except H Be B 2 4 62. TOTAL electrons correct
5 Br2
PCl3- CCl4
`
Moleculeformula
1
Start Lewis Strwithout electrons
2
Redraw &connect atomswith bonding pairs
3
Calculate total valence electronsand subtract bonding electrons
4
Check step1. all have 8 except H Be B 2 4 62. TOTAL electrons correct
5 NF3
BH3-NH41+
`
11/20/2012 Standards: 2 (Chemical Bonds) Objectives:a. Std 1 Quiz (40 pts)b. Be able to draw Lewis Structures for covalent molecules (who is central
atom). DO NOW: 1. Clear desks and floors - keep responders and blank paper for scratch 2. The Lewis Structures for these molecules:
N2 HCN 3. Define VSEPR (what each letter means and what the theory states).HOMEWORK: NONE - watch vids on-line to help understand drawing Lewis Str. Enjoy friends and family during the Thanksgiving Season.
BE GRATEFUL FOR ALL YOUR BLESSINGS, AND YOU'LL ENJOY HAVING MORE BLESSINGS.====================================================== JOURNAL: 11/19BASKET: HANDOUT (or on your own paper) -
Drawing Lewis Structures - draw Lewis Structures for these molecules: CO2 F2O H2O H2S HCN (5 pts) Std 2
RESPONDERS
resonance
linearbenttrigonal planartrigonal pyramidtetrahedral
12/7/2011 Standards: 2 (Chemical Bonds) Objectives:a. Be able to draw Lewis Structures for covalent molecules.b. Be able to use VSEPR to predict shapes (5) of molecules c. Be able to perform LAB - Molecular Geometry, Lewis Str & VSEPR. DO NOW: 1. p. 255-257 30, 32, 34 HOMEWORK: 1. p. 255-257 PP's 30-38 (5 pts) Std 2 2. Read through lab at least once and be sure you understand the 3 reasons
for molecular shapes ========================================================STAMPS:
Journal 12/5 & 12/6 1. PRINT Polarity in Bonds vs Polarity in Molecules (1 pts) Std 2 2. PRINT MOLECULAR GEOMETRY, LEWIS STRUTURES
AND VSEPR – lab (1 pts) Std 2ANNOUNCEMENTS:Mr. Wigger & son Jacob will only perform on Friday night. Will give you preview today (end of period).
This is how we get more than one bond - WE ARE OUT OF ELECTRONS
2. put in bonding electrons
total left for the rest of the Lewis Structure
Not enough to go around N doesn't have 8
4. Start Sharing
N still doesn't have enough electrons
5. m
ore
shar
ing
1. basic layout
1. H has 2, C has 8, N has 8Total electrons = 8
Total valence electrons
Subtract bonding electrons
3. add in leftovers
Valence electrons available
ElementElement Valence
electronsin Lewis Str
BCBePH
(Column)
12/8/2011 Standards: 2 (Chemical Bonding) Objectives:a. Prep for tomorrow's lab - MOLECULAR GEOMETRY, LEWIS
STRUCTURES AND VSEPR - Zum (computer)b. Be able to identify all 5 shapes from the VSEPR theoryc. Be able to predict shape based on central atom having share or unshared DO NOW: 1. Draw Lewis Structures for BeBr2 SO2 CO2
Show columns 3-5HOMEWORK: 1. Memorize Ions Quiz 3 coming next Tuesday. Start studying.
16 ions will be on this quiz. 2. PRINT Lewis Structures and Molecular Geometry - Ball & Stick
(Shapes) (1 pts) Std 2 =====================================================STAMPS: Journal 12/7 1. Ch 9.3, PP's p. 255-257 #30-38 (5 pts) Std 2
ANNOUNCEMENTS:ChemThink.com - Molecular Shape tutorial and questions due tonight by mid-night
Teacher NotesExplanations will be given by models (show all shapes in 3-D), magnets to demo effects of unshared pairs, and game
linearbenttrigonal planartrigonal pyramidtetrahedral
TN
Moleculeformula
1
Start Lewis Strlay out atoms
2
Put in bondingpairs to connectall atoms(redraw here)
3
Calculate total valence electronsand sub bondingelectrons
4
Check step1. all have 8 except H Be B 2 4 62. TOTAL electrons correct5
As a Man thinketh, so is
he.By: Tim Allen
Lazy thoughts crystallize into habits of uncleanness and
dishonesty. This solidifies into circumstances of foulness and
begging.16:50
Molecular Shapes
1. Linear
Remember that all atoms want ____ valence electrons.8O O
N
2. Trigonal Planar
Molecular Shapes
3. Tetrahedral 4. Trigonal Pyramidal
5. Bent
does have unshared pairson central atom
does not have unshared pairson central atom
12/9/2011 Standards: 2 (Chemical Bonding)Objectives: (20 pts)a. LAB - Lewis Structures and Molecular Geometry - Zum -
Copy FORMULAS of all molecules before starting lab.DO NOW: 1. Read lab SILENTLY Pay special attention to #5HOMEWORK: 1. Ch 9.4 p. 262 49-52. DO NOT FOLLOW DIRECTIONS IN TEXT.
Draw Lewis Structure & show total valence electrons & shape as you will do in today's lab. 2. Lab - Lewis Str & Molecular Geo - Ball & Stick (Shapes) (1 pt) Std 2 3. Remember Memorize Ions 3 next Wed - All 13 ions and first 3 acids (15 points)============================================================STAMPS: NONE
linearbenttrigonal planartrigonal pyramidtetrahedral
LAB WILL BE DUE ON MONDAY
see page 260 for shapes
Unshared pairs are the name of the game
Page 260
teardrop = unshared
pair
no teardrops = no unshared
pairs
teardrop = unshared
pair
teardrop = unshared
pair
unshared pair impossible
does have unshared pairson central atom
does not have unshared pairson central atom
Moleculeformula
1
Start Lewis Strlay out atoms
2
Put in bondingpairs to connectall atoms(redraw here)
3
Calculate total valence electronsand sub bondingelectrons
4
Check step1. all have 8 except H Be B 2 4 62. TOTAL electrons correct5
Moleculeformula
1
Start Lewis Strlay out atoms
2
Put in bondingpairs to connectall atoms(redraw here)
3
Calculate total valence electronsand sub bondingelectrons
4
Check step1. all have 8 except H Be B 2 4 62. TOTAL electrons correct5
Moleculeformula
1
Start Lewis Strlay out atoms
2
Put in bondingpairs to connectall atoms(redraw here)
3
Calculate total valence electronsand sub bondingelectrons
4
Check step1. all have 8 except H Be B 2 4 62. TOTAL electrons correct5