Chapter 4

Binary compounds-contain 2 elements1) metal w/ charge and non-metal (Type I)2) Transition metal and non-metal (Type II)3) two non-metals (Type III)

(Type I)Cation- 1st – same name as elementAnion- 2nd- root + ideExamples NaI CaO

1) write element symbol and charge 2) net charges must equal zero 3) add subscripts if charges don’t add up

to zero Barium sulfide Magnesium phosphide

How to write formula from name 1) write element symbol and charge 2) net charges must equal zero 3) add subscripts if charges don’t add up

to zero Lead (II) oxide Iron (III) sulfide Roman numeral= charge of transition

metal

Write name from formula• Need to figure out the charge• Include roman numeral in name FeCl2 (__x 1) + (-1 x 2)= 0 Fe+2

Iron (II) chloride ic- higher charge Fe+3 Ferric ous- lower charge Fe+2 Ferrous Example 4.2, 4.3

1) name the first element by its element name

2) second element is named as though it were an anion (ide ending)

3) prefixes are used to denote the number of atoms (Table 4.3 pg 95)

4) mono is never used for the first element Example 4.4, 4.5

Example 4.6

Polyatomic ion- charged entities composed of several atoms bound together

Oxyanions- SO3 and SO4

ite ate hypo-less than per- more than ClO- hypochlorite ClO2 – chlorite ClO3 – chlorate ClO4 - perchlorate

Must know - name of polyatomic ion - charge of polyatomic ion - recognize polyatomic ion NH4C2H3O2

FeSO4

Example 4.7 more than one polyatomic ion or

polyatomic ions with a subscript require parentheses

(NH4)2SO4

Fe3(PO4)2

Polyatomic ions names do not change

Ammonium nitrate Calcium hydroxide Lead (II) sulfate

Acids- when dissolved in H2O, they produce H+ ions

Sour tasteNaming 1) if the anion does not contain O2 then use

hydro prefix, element root + ic (ex: HCl) 2) if O2 is in the anion, then look at the

ending of the polyatomic ion (HNO3 and HNO2)

ite- ous acid ending ate- ic

Calcium hydroxide Ca(OH)2

Iron (II) oxide FeOExample 4.9

1. HF 9. Chlorous Acid 10. HClO3

2. HBr 11. HClO4

3. H3PO4 12. carbonic acid

4. HNO2 13. HC2H3O2

5. Nitric acid 14. HClO6. H2SO3 15. HI7. H2SO4

1. Hydrofluoric Acid 9. HClO2

2. HCl 10. Chloric Acid3. Hydrobromic Acid 11. Perchloric Acid4. Phosphoric Acid 12. H2CO3

5. Nitrous Acid 13. Acetic Acid6. HNO3 14. Hypochlorous

Acid7. Sulfurous Acid 15. Hydroiodic Acid8. Sulfuric Acid