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Molecules and Ions
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Not balanced

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Slide 21

Writing Ionic Compound Formulas

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

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

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

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

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

Naming Binary Compounds

P2O5 =

CO2 =

CO =

N2O =

diphosphorus pentoxide

carbon dioxide

carbon monoxide

dinitrogen monoxide

Slide 27

Practice – Write the Formula

Practice – Write the Formula

Check next slide for answers

Slide 28

Answers – Write the Formula

Answers – Write the Formula

Slide 29

Practice – Name the Compounds

Practice – Name the Compounds

Check next slide for answers

Slide 30

Answers – Name the Compounds

Answers – Name the Compounds

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