Molecules and Ions

Page
3

Not balanced

( )

2

Slide 21

Writing Ionic Compound Formulas

Example: Aluminum phosphate

1. Write the formulas for the cation and anion, including CHARGES!

Al3+

PO43-

2. Check to see if charges are balanced.

They ARE balanced

Slide 22

Naming Ionic Compounds

Cation first, then anion

Monatomic cation = name of the element

Ca2+ = calcium ion

Monatomic anion = root + -ide

Cl- = chloride

CaCl2 = calcium chloride

Slide 23

Naming Ionic Compounds

some metal forms more than one cation

use Roman numeral in name

PbCl2

Pb2+ is cation

PbCl2 = lead(II) chloride

Metals with multiple oxidation states

Slide 24

Binary Molecular Compounds

Compounds between two nonmetals

First element in the formula is named first.

Keeps its element name

Gets a prefix if there is a subscript on it

Second element is named second

Use the root of the element name plus the -ide suffix

Always use a prefix on the second element

Slide 25

List of Prefixes

1 = mon(o)

2 = di

3 = tri

4 = tetra

5 = penta

6 = hexa

7 = hepta

8 = octa

9 = nona

10 = deka

Slide 26

Naming Binary Compounds

P2O5 =

CO2 =

CO =

N2O =

diphosphorus pentoxide

carbon dioxide

carbon monoxide

dinitrogen monoxide

Slide 27

Practice – Write the Formula

Check next slide for answers

Slide 28

Answers – Write the Formula

Slide 29

Practice – Name the Compounds

Check next slide for answers

Slide 30

Answers – Name the Compounds