1. Warm up 10-19-15 Covalent bonds are between _____ and _____ elements
Ionic bonds are between _____ and _____ elements
Identify if these compounds are ionic or covalent: FeS, CO2, Cl2 and AlBr3
Agenda
-Notes Unit 4-3
-Lab Chemical Bonds
Homework
Oct 23 - Quiz Unit 4
Oct 24 - Saturday School
Oct 27 - Xtra Credit

2. Formulas and Names of Ionic and Covalent Compounds
Unit 4-3
Formulas and Names of Ionic and Covalent Compounds

3. Nomenclature: Naming of Compounds
Must determine which bond made up the compound
Ionic bond has metal elements
Covalent bond has no metal elements

4. Naming Covalent (Molecular) Compounds
1. Use a prefix to indicate the amount of each element in the compound 2. Never use mono– on the first element name. 3. Give the last element an –ide ending.

5. Naming Covalent (Molecular) Compounds
Mono– 1
Di– 2
Tri– 3
Tetra– 4
Penta– 5
Hexa– 6
Hepta– 7
Octa– 8
Nona– 9
Deca– 10
Prefixes

6. Examples
CO2
B2H4
Dinitrogen trioxide

7. Naming Covalent Compounds Practice
Chemical Formula
Name
1. CO
2. P2S5
3. SiO2
4. SCl4 5.
Trinitrogen pentabromide 6.
Dinitrogen trioxide
7. Why incorrect?
Monosulfur dioxide
Carbon Monoxide, diphosphorus pentasulfide, Silicon dioxide, sulfur tetrachloride, N3Cl5,

8. Naming Ionic Compounds
1. Ending element change to –ide. (no prefixes)
2. Make sure all the charge cancel each other out
3. If there is a transition metal you indicate the charge with a roman numeral after the name of the metal.
4. If it is a polyatomic ion, you simply use the name as it is. (no –ide)

9. Examples For rule #1 and #2
CaCl2
MgI2
Potassium Sulfide
Beryllium Fluoride

10. Practice MgCl2 Ca2P3 Potassium sulfide Barium nitride
Use the toothpick to stir.

12. Unit 4 Quiz Topics Oct 23
2 questions - Finding Ions (positive and negative charge) 2 questions - Bonds (3 types) 2 questions - Naming compounds

13. Bond Identification lab
Objectives: Classify compounds as having ionic or covalent bond based on its physical property: solubility, melting point and conductivity
Procedure:
Obtain the chemicals (1 scoop) each
Set up the apparatus and label your aluminum foil
Put the chemicals on top of the aluminum foil and apply heat to it
Record the order that each compound melt
Dissolve the chemicals in water and ethanol

14. Clean Up Procedures
Aluminum foil and compounds from the plates go in the trash
Rinse your plates

15. Reminders Lab due next class Notes summary
Oct 23 - SEAP summer program deadline
Oct 24 - Chemistry Saturday school

16. More Examples
Mixture of covalent, ionic and polyatomic nomenclature.

17. SrS
Strontium Sulfide

18. GaCl3
Gallium Chloride

19. Ammonium
NH4+

20. Calcium Oxide
CaO

21. Sulfate
SO42-

22. Phosphate
PO43-

23. Strontium Nitride
Sr3N2

24. Li3N
Lithium Nitride

25. Hydroxide
OH-

26. Beryllium Carbonate
BeCO3

27. BeSe
Beryllium Selenide

28. Mg(NO3)2
Magnesium Nitrate

29. KBr
Potassium Bromide

30. AlPO4
Aluminum Phosphate

31. Magnesium Arsenide
Mg3As2

32. NaOH
Sodium Hydroxide

33. Potassium Sulfate
K2SO4

34. Ba2P3
Barium Phosphide

35. Rubidium Phosphide
Rb3P

36. Potassium Chloride
KCl

37. Sodium Oxide
Na2O

38. Rb2O
Rubidium Oxide