1. HOW TO NAME COMPOUNDS THAT CONTAIN TRANSITION METALS NAMING IONIC COMPOUNDS: PART II

2. USING ROMAN NUMERALS TO DENOTE THE CHARGE OF THE TRANSITION METAL FeOFe 2 O 3

3. WHY DO WE NEED A ROMAN NUMERAL? Some metals can take MORE THAN ONE charge The roman numeral always indicates the charge on the metal in that compound The roman numeral does NOT tell you the number of metal atoms present in the compound.

4. LET’S HAVE ANOTHER TRY AT THIS… WS 2 WS 3

5. YOU TRY SOME ON YOUR OWN PAUSE THE VIDEO AND ANSWER THESE QUESTIONS. WHEN YOU HAVE ANSWERED THEM, RESTART THE VIDEO. What is the name of CuCl 2 What is the name of PbS 2

6. YOU TRY SOME ON YOUR OWN PAUSE THE VIDEO AND ANSWER THESE QUESTIONS. WHEN YOU HAVE ANSWERED THEM, RESTART THE VIDEO. What is the name of CuCl 2 What is the name of PbS 2 Here is what we initially know about the charges Cu ? Cl -1 Since there are two Cl - ions, Cu needs to be in its Cu +2 oxidation state to balance out the negative. Copper (II) chloride Here is what we initially know about the charges Pb ? S -2 Since there are two S -2 ions, Pb needs to be in its Pb +4 oxidation state to balance out the negative. Lead (IV) sulfide

7. TURNING THE PROCESS AROUND What is the formula for copper (I) phosphide? What is the formula for tin (II) fluoride?

8. A SIDE NOTE: THE MERCURY (I) CATION What is different about the mercury (I) ion? What is the formula for mercury (I) iodide?

9. YOU TRY SOME ON YOUR OWN PAUSE THE VIDEO AND ANSWER THESE QUESTIONS. WHEN YOU HAVE ANSWERED THEM, RESTART THE VIDEO. What is the formula for iron (III) sulfide What is the formula for mercury (II) chloride?

10. YOU TRY SOME ON YOUR OWN PAUSE THE VIDEO AND ANSWER THESE QUESTIONS. WHEN YOU HAVE ANSWERED THEM, RESTART THE VIDEO. What is the formula for iron (III) sulfide What is the formula for mercury (II) chloride? Here is what we initially know about the charges Fe 3+ S 2- Since the LCM for a 3 & 2 is 6, we will need two Fe 3+ ions and three S 2- ions to balance out the charges Fe 2 S 3 Here is what we initially know about the charges Hg 2+ Cl - You will need two Cl- ions to balance out the +2 charge on the mercury. HgCl 2