Do Worksheet 1 only. Skip #12, 20, 21, 25, 29, 30, 32, 38, 45, 46, 52, 54, 55, 56, 59, 60.

Click on the following link to open the PDF file:

http://elac.edu/ELAC/media/ELAC-Assets/Documents/Academics/Departments-Disciplines/Chemistry/Chem-65-LabManual.pdf

To submit assignment:

you may print out the worksheet, upload picture of your completed work;

or complete your work on lined papers, notepad, or drawing pad, then upload.

Guidelines for Nomenclature of Ionic Compounds

• write metal ion first
• metals in groups 1A, 2A, and 3A, plus Ag, Zn and Cd have fixed charges: don’t use Roman numeral
• transition metals and group 4A metals have variable charges: use Roman numeral in parenthesis to indicate charge
• make sure total positive charge = total negative charge

Example: #1. cadmium bromide

cadmium = Cd2+ bromide = Br1-

answer: CdBr2 (need 2 Br1- to match 1 Cd2+ , so total positive charge = total negative charge)

Example #11. lead (II) sulfide (lead can have variable charges, the Roman numeral (II) means charge = 2+)

lead (II) = Pb2+, sulfide = S2-

answer: PbS

Example #33. CuSO4

Cu, copper is a transition metal with variable charges. Need to determine its charge and use Roman numeral

SO4 is a polyatomic ion that has a charge of 2-: SO42- = sulfate,

Cu must be 2+ to balance the charge: Cu2+ = copper (II)

answer: copper (II) sulfate

HELPFUL LINKS

1.Intro to writing formulas of ionic compounds (Links to an external site.)

2.Ionic compounds with polyatomic ions (Links to an external site.)

3.Ionic compounds with metals of variable charges (Links to an external site.)