class notes from chemistry 9-23-09

1. Introduction to Chapter 5 Naming Compounds 9/23/09

4. Two Types of Compounds Type 1 Molecular compounds Made by joining nonmetal atoms together into molecules. Type 2 Ionic compounds Made by combining two ions. Cation and an anion. +/- Metals and Nonmetals

6. Chemical Formulas Shows the kind and number of atoms in the smallest piece of a substance Molecular formula- number and kinds of atoms in a molecule CO2 C6H12O6

7. Formula Unit The smallest whole number ratio of atoms in an ionic compound Ions surround each other so you can’t say which is hooked to which

8. Charges on ions For most of the Group A elements, the Periodic Table can tell what kind of ion they will form from their location Elements in the same group have similar properties Including the charge when they are ions

10. What about the others? What about the transition metals They can form more than one type of ion We have to figure those out some other way More on this later

11. Naming ions We will use the systematic way Cation- if the charge is always the same (Group A) just write the name of the metal. Na+1Sodium Ca+2Calcium Al+3Aluminum Li+1 Lithium

12. Write Formulas for these Potassium ion Magnesium ion Calcium ion Cesium ion Barium ion Hydrogen ion

13. Naming Anions Anions are always the same Change the element ending to -ide F-1 Fluorine

14. Naming Anions Anions are always the same Change the element ending to -ide F-1 Fluoride

15. Name these Cl-1 N-3 Br-1 O-2 I- Chloride Nitride Bromide Oxide Iodide

16. Write these Sulfide ion iodide ion phosphide ion Strontium ion