1. Warm up10-22-15 1.Name the following compounds: CaCl 2 S 2 F 5 2. Write the chemical formula for these compounds Potassium sulfide Diphosphorus tetrachloride Agenda Turn in lab bonds Take Quiz Unit 4 Notes Unit 4-4 Practice WS Unit 4-4 Homework Oct 24 – Academic School Oct 29 - Extra credit due Oct 30 - Online HW unit 4

2. Quiz Unit 4 2 questions - Finding Ions (positive and negative charge) 2 questions - Bonds (3 types) 2 questions - Naming compounds (rule 1 & 2) You will need a half sheet of paper Record your quiz version #

3. Unit 4-4 Lewis Dot structure How do we determine which elements will combine to make bonds?

4. Nomenclature: Ionic Compounds Transition Metal Examples Regular metal CaCl 2 = Calcium chloride Na 2 S = Sodium sulfide 1.FeCl 2 2.FeN 3.Iron (I) nitride 4.Iron (II) nitride Answers 1.Iron (II) chloride 2.Iron (III) nitride 3.Fe 3 N 4.Fe 3 N 2

5. Nomenclature: Ionic Compounds Polyatomic Ions (NH 4 ) + Ammonium(NH 3 ) Ammonia (OH) - Hydroxide (CO 3 ) -2 Carbonate (NO 3 ) - Nitrate(NO 2 ) - Nitrite (SO 4 ) -2 Sulfate(SO 3 ) -2 Sulfite (PO 4 ) -3 Phosphate(PO 3 ) -3 Phosphite (Cr 2 O 7 ) -2 Dichromate

6. Naming Polyatomic Ions Examples 1.______________SrSO 4 2.______________ Ca(NO 2 ) 2 3.Ammonium Sulfide_____ 4.Potassium hydroxide_____ Strontium sulfate Calcium nitrite (NH 4 ) 2 S KOH

7. Naming Ionic Compounds Practice 1. ______________ AlCl 3 2. ______________ Na 2 S 3.Lithium Bromide_____ 4.Calcium Fluoride_____ 5.____________CuCl 2 6.Iron (III) Phosphide ____ 7.______________Li 3 PO 4 8.______________ Sr(NO 3 ) 2 Transition metal

8. Electron Distribution in Molecules Electron distribution is depicted with Lewis structures (electron dot) showing valence electrons Show the number of bond in the covalent compound (In ionic bonds, it was decided with charges) G. N. Lewis 1875 - 1946

9. Lewis Structures for Elements 1)Write the element symbol. 2)Starting at the right, draw 4 electrons, or dots, one on each side around the element symbol.

10. Lewis Structures Try these elements on your own: a)H b)P c)Ca d)Ar e)Cl f)Al

11. Lewis Structures On your worksheet, try these elements on your own: a)H b)P c)Ca d)Ar e)Cl f)Al

12. Lewis Structures On your worksheet, try these elements on your own: a)H b)P c)Ca d)Ar e)Cl f)Al

13. Lewis Structures On your worksheet, try these elements on your own: a)H b)P c)Ca d)Ar e)Cl f)Al

14. Lewis Structures On your worksheet, try these elements on your own: a)H b)P c)Ca d)Ar e)Cl f)Al

15. Lewis Structures On your worksheet, try these elements on your own: a)H b)P c)Ca d)Ar e)Cl f)Al

16. Lewis Structures On your worksheet, try these elements on your own: a)H b)P c)Ca d)Ar e)Cl f)Al

17. Bond Formation A bond can result from an overlap of atomic orbitals on neighboring atoms. Cl HH + Note that each atom has a single, unpaired electron. H Cl

18. Bond and Lone Pairs Valence electrons are distributed as shared or BOND PAIRS and unshared or LONE PAIRS. Valence electrons are distributed as shared or BOND PAIRS and unshared or LONE PAIRS. H Cl lone pair (LP) shared or bond pair This is called a LEWIS structure.

19. All atoms want to have 8 valence electrons (except H, only needs 2) Obtain a total of 8 by sharing Only lonely electrons will share – pair of electrons with existing partners will not share and make bonds Sharing Electrons

20. Types of Bonds Single bond Cl 2 Double bond = CO 2 Triple bond N 2

21. Draw C 2 H 4 Draw H 2 O 2 Example Lewis Dot for Compounds Draw CH 4

22. Lewis structure help predict molecular shape Valence Shell Electron Pair Repulsion (VSEPR)

23. Assignments Summary Lewis dot worksheet (4-4) due next class