1. 1 Nomenclature writing chemical formulas naming chemical compounds Chapter 5 potassium chromatepotassium dichromate

2. 2 Sodium and Chlorine NaCl Sodium Chloride Cation 1 st : name of element Anion 2 nd : root and add -ide When combined together ✓ Metals lose e- (+ ion = cation) ✓ Nonmetals gain e- (- ion = anion) ✓ Ionic Compounds (Type I Binary Ionic) 1A2A8A 3A4A5A6A7A 1+ 1B2B3B4B5B6B7B8B9B10B 1- Na + Cl - Na Cl

3. 3 Magnesium and Fluorine MgF 2 The number of electrons lost must equal the number of electrons gained The total + and - charge must add to 0 Magnesium Fluoride 1A2A8A 3A4A5A6A7A 1- 2+ 1B2B3B4B5B6B7B8B9B10B Mg F Mg 2+ F -

4. 4 Aluminum and Oxygen Al 2 O 3 Aluminum Oxide The number of electrons lost must equal the number of electrons gained Overall charge = 0 1A2A8A 3A4A5A6A7A 2- + 1B2B3B4B5B6B7B8B9B10B 3+ Al O Al 3+ O 2-

5. 5 Write the chemical formula for strontium sulfide SrS You might have criss-crossed to Sr 2 S 2 but then you must reduce it to the lowest whole number ratio. remember always write ionic formula in lowest whole number ratio

6. 6 Write the chemical formula for potassium nitride K3NK3N K +1 N -3

7. 7 1A2A8A 3A4A5A6A7A N OF Na Mg 1B2B3B4B5B6B7B8B9B10B AlPS Cl K Ca The Periodic Table

8. 8 Write the chemical formula for gallium oxide Ga +3 O -2 Ga 2 O 3

9. 9 Write the chemical formula for potassium sulfide K +1 S -2 K 2 S

10. Write the chemical name for CaBr 2 10 Calcium Bromide Remember: the metal (cation is 1 st ) the nonmetal (anion is 2 nd : root and -ide)

11. Chemical formula for copper fluoride 11 1A2A8A 3A4A5A6A7A 1B2B3B4B5B6B7B8B9B10B 2+ 1+2+ Oxidation states for Copper: 1+: Cu(I) 2+: Cu(II) Roman Numerals refresh 1: I 2: II 3: III 4: IV 5: V 6: VI 7: VII Know F - The number of electrons lost = the number of electrons gained Overall charge = 0 so use Cu + or Cu(I) CuF

12. Chemical formula for copper(II) fluoride 12 Copper: F - 1+: Cu(I) 2+: Cu(II) CuF 2 Roman numeral tells you the charge on copper Cu(II) = Cu 2+ 1A2A8A 3A4A5A6A7A 1B2B3B4B5B6B7B8B9B10B 2+ 1+2+

13. 13 Write the chemical formula for zinc chloride ZnCl 2 Remember that zinc is one of the transition metals that does not require a Roman #, since it’s oxidation state is always +2. 1A2A8A 3A4A5A6A7A 1B2B3B4B5B6B7B8B9B10B 2+ 1+2+

14. 14 Write the chemical formula for chromium (VI) sulfide The Roman # tells you the +6 charge on the chromium metal Cr +6 S -2 You might have criss-crossed to Cr 2 S 6 but then you must reduce it to the lowest whole number ratio. CrS 3

15. 15 Write the name for Fe 2 O 3 you can un-criss-cross or you can determine the charge on iron by working from the charge on the anion iron(III) oxide

16. 16 Write the name for Ag 2 S No need for a Roman # since silver is always +1 (memorize along with Zn and Cd) Silver sulfide 1A2A8A 3A4A5A6A7A 1B2B3B4B5B6B7B8B9B10B 2+ 1+2+

17. 17 Write the name for Cu 2 O You can “un-criss-cross” or you can work into the cation by knowing that the anion is -2 ✓ The total + and - charge must add to 0 ✓ this means that electrons lost = electrons gained ✓ the Roman # = the individual oxidation state of one of the metal ions (not the total metal charge) Copper (I) oxide

18. 18 Write the name for CrP 2 you can’t just un-criss-cross because this is a formula which has been reduced. ✓ work off the non-metal’s charge ✓ remember the total + must equal - that means the e- lost = e- gained chromium (VI) phosphide

19. 19 Roadmap for Naming Binary Compounds