Catalyst – October 23+6, 2009

Take out DHMO letter please.

Model the formation of the following compound: H2S

Draw the Lewis Structure for P2

Today’s Agenda

CatalystReview Multiple Bond Formation

DHMO Letter SharingNaming Covalent CompoundsExit Question

Today’s Objectives

SWBAT model bond formation for single and multiple covalent bonds.

SWBAT name covalent compounds.

Steps for Multiple Bond LDS’s

1. Write formula2. Number of valence electrons

(ve-)3. Number of octet electrons

(oe-) 4. Number of bonds = [(oe-) –

(ve-)]/2

5. Draw LDS!

Try these! Write in notes!

1. Se2

2. CS2

3. CH2Cl24. Ge2H4

5. OS6. C2Br6

7. NOBr

The Environment…

In this class, I want you to learn the contents of basic chemistry…

However, I also want you to be able to understand the importance of chemistry in the environment.

There is a chemical, DHMO, that is especially ruining our environment in many ways… and something must be done.

Surprise….

I have some DHMO with me today.

Does anyone want to see it??

Naming Covalent

Compounds

A compound made from Lithium and Oxygen.

How do we know if it is ionic or covalent? Metals and non-metals make ionic compounds.

Naming Ionic Compounds

Ionic Bond

Ion: Li Ion: O

Li O

Ionic Bond

Ion: Li Ion: O

Li1+ O2-

Ionic Bond

Ion: Li Ion: O

Li1+ O2-

Ionic Bond

Ion: Li Ion: O

Li2O

Ionic Bond

Bohr Model: Li Bohr Model: O

Ionic Bond

Bohr Model: Li Bohr Model: O

Ionic Bond

Bohr Model: Li Bohr Model: O

Ionic Bond

Bohr Model: Li Bohr Model: O

Ionic Bond

Bohr Model: Li Bohr Model: O

Naming Ionic Compounds

MgO

Naming Ionic Compounds

MgO

Magnesium Oxide

Naming Ionic Compounds

CaCl2

Naming Ionic Compounds

CaCl2

Calcium Chloride

Naming Ionic Compounds

Al2O3

Naming Ionic Compounds

Al2O3

Aluminum Oxide

Naming covalent compounds No Kriss Krossing!

I will provide you with the compound’s formula.

However, naming will be a tiny bit more difficult.

In your notes, do this first example with me.

Naming Covalent Compounds

PCl3

How do we know if this is a covalent compound?

Is it between a metal and a nonmetal? NO!!! Then, it is not ionic.

Is it between a nonmetal and a nonmetal? YES!!! Then, it is covalent!

Naming Covalent Compounds

Rule 1: If the first element has more than one atom, give it a

prefix.

Naming Covalent Compounds1 – mono- 2 – di-

3 – tri- 4 – tetra-5 – penta- 6 – hexa-7 – hepta- 8 – octa-9 – nona- 10 – deca-

Naming Covalent Compounds

PCl3

Naming Covalent Compounds

PCl3

Phosphorous

Naming Covalent Compounds

Rule 2: The second element always gets a

prefix, uses the root of the word

and ends in-ide.

Naming Covalent Compounds

PCl3

Phosphorous

Naming Covalent Compounds

PCl3

PhosphorousTrichloride

Naming Covalent Compounds

Rule 3: The “o” or “a” at the end of

the prefix is dropped if the

element begins in a vowel.

Naming Covalent Compounds

N2O

Naming Covalent Compounds

Rule 1: If the first element has more than one atom, give it a

prefix.

Naming Covalent Compounds

N2O

Dinitrogen

Naming Covalent Compounds

Rule 2: The second element always gets a

prefix, uses the root of the word and ends in -ide.

Naming Covalent Compounds

N2O

Dinitrogen Monooxide

Naming Covalent CompoundsRule 3: The “o”

or “a” at the end of the prefix is dropped if the element begins

in a vowel.

Naming Covalent Compounds

N2O

Dinitrogen Monooxide

Naming Covalent Compounds

N2O

Dinitrogen Monoxide

Practice Time!

EXAMPLESCCl4As2O

Whiteboards

SO

Sulfur Monoxide

NO2

Nitrogen Dioxide

N2O

Dinitrogen Monoxide

P2O5

Diphosphorous Pentoxide

PCl5

PhosphorousPentachloride

NF3

NitrogenTrifluoride

Writing Formulas from NamesEXAMPLES• Carbon

tetrachloride• Diarsenic

trioxide• Sulfur dioxide• Nitrogen

trifluoride

YOUR TURN TO “FORMULIZE”

1. Sulfur trioxide2. Carbon

monoxide3. Carbon dioxide4. Boron trifluoride5. Tetraphosphorus

hexasulfide6. Xenon difluoride

Independent Practice Time

Lucky you!

Exit Question

1. Write the formula for: Silicon dioxide Dihydrogen monoxide

2. Write the name for the following compounds:

CO2

NH3