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11/19/2012 Standards: 1 (Str of Atom) and Objectives: 2 (Chem Bonds) a. Test for understanding – Std 1 – Structure of the Atom b. Be able to draw at least.

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Presentation on theme: "11/19/2012 Standards: 1 (Str of Atom) and Objectives: 2 (Chem Bonds) a. Test for understanding – Std 1 – Structure of the Atom b. Be able to draw at least."— Presentation transcript:

1 11/19/2012 Standards: 1 (Str of Atom) and Objectives: 2 (Chem Bonds) a. Test for understanding – Std 1 – Structure of the Atom b. 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: CO 2 F 2 O H 2 O H 2 S 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

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3 Std 1 Quiz tomorrow - 40 pts

4 formula Lewis Structure HH O H2OH2O H2H2 O Total Unshared bonding AtomsValence Electrons A bonding pair of electrons = Check 2 things to have a correct Lewis Structure 1. 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

5 Molecule formula 1 Start Lewis Str without electrons 2 Redraw & connect atoms with bonding pairs 3 Calculate total valence electrons and subtract bonding electrons 4 Check step 1. all have 8 except H Be B 2 4 6 2. TOTAL electrons correct 5 `

6 Molecule formula 1 Start Lewis Str without electrons 2 Redraw & connect atoms with bonding pairs 3 Calculate total valence electrons and subtract bonding electrons 4 Check step 1. all have 8 except H Be B 2 4 6 2. TOTAL electrons correct 5 Br2 PCl 3 - CCl4 `

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8 Molecule formula 1 Start Lewis Str without electrons 2 Redraw & connect atoms with bonding pairs 3 Calculate total valence electrons and subtract bonding electrons 4 Check step 1. all have 8 except H Be B 2 4 6 2. TOTAL electrons correct 5 NF3 BH 3 -NH41+ `

9 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: N 2 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: 11/19 BASKET: ­ HANDOUT (or on your own paper) - Drawing Lewis Structures - draw Lewis Structures for these molecules: CO 2 F 2 O H 2 O H 2 S HCN (5 pts) Std 2 RESPONDERS

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17 linear bent trigonal planar trigonal pyramid tetrahedral 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 2 A NNOUNCEMENTS: M r. Wigger & son Jacob will only perform on Friday night. Will give you preview today (end of period).

18 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. more sharing 1. basic layout 1. H has 2, C has 8, N has 8 Total electrons = 8 Total valence electrons Subtract bonding electrons 3. add in leftovers

19 Valence electrons available Element Valence electrons in Lewis Str B C Be P H (Column)

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21 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 theory c. Be able to predict shape based on central atom having share or unshared DO NOW: 1. Draw Lewis Structures for BeBr 2 SO 2 CO 2 Show columns 3-5 HOMEWORK: 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 Notes Explanations will be given by models (show all shapes in 3-D), magnets to demo effects of unshared pairs, and game linear bent trigonal planar trigonal pyramid tetrahedral TN

22 Molecule formula 1 Start Lewis Str lay out atoms 2 Put in bonding pairs to connect all atoms (redraw here) 3 Calculate total valence electrons and sub bonding electrons 4 Check step 1. all have 8 except H Be B 2 4 6 2. TOTAL electrons correct 5

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24 As a Man thinketh, so is he. B y: Tim Allen

25 Lazy thoughts crystallize into habits of uncleanness and dishonesty. This solidifies into circumstances of foulness and begging. 1 6:50

26 Molecular Shapes 1. Linear Remember that all atoms want ____ valence electrons. 8 OO N 2. Trigonal Planar

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29 Molecular Shapes 3. Tetrahedral 4. Trigonal Pyramidal 5. Bent

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33 does have unshared pairs on central atom does not have unshared pairs on central atom

34 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. D O NOW: 1. Read lab SILENTLY Pay special attention to #5 HOMEWORK: 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 linear bent trigonal planar trigonal pyramid tetrahedral LAB WILL BE DUE ON MONDAY

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37 see page 260 for shapes Unshared pairs are the name of the game

38 Page 260 teardrop = unshared pair no teardrops = no unshared pairs teardrop = unshared pair teardrop = unshared pair unshared pair impossible

39 does have unshared pairs on central atom does not have unshared pairs on central atom

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44 Molecule formula 1 Start Lewis Str lay out atoms 2 Put in bonding pairs to connect all atoms (redraw here) 3 Calculate total valence electrons and sub bonding electrons 4 Check step 1. all have 8 except H Be B 2 4 6 2. TOTAL electrons correct 5

45 Molecule formula 1 Start Lewis Str lay out atoms 2 Put in bonding pairs to connect all atoms (redraw here) 3 Calculate total valence electrons and sub bonding electrons 4 Check step 1. all have 8 except H Be B 2 4 6 2. TOTAL electrons correct 5

46 Molecule formula 1 Start Lewis Str lay out atoms 2 Put in bonding pairs to connect all atoms (redraw here) 3 Calculate total valence electrons and sub bonding electrons 4 Check step 1. all have 8 except H Be B 2 4 6 2. TOTAL electrons correct 5

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