take out dhmo letter please

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 AgendaCatalystReview Multiple Bond Formation

DHMO Letter SharingNaming Covalent CompoundsExit Question

Today’s ObjectivesSWBAT model bond formation for single and multiple covalent bonds.

SWBAT name covalent compounds.

Steps for Multiple Bond LDS’s1. Write formula2. Number of valence electrons

(ve-)3. Number of octet electrons (oe-) 4. Number of bonds = [(oe-) – (ve-)]/25. Draw LDS!

Try these! Write in notes!

1. Se22. CS23. CH2Cl24. Ge2H45. OS6. C2Br67. 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


Li1+ O2-


Li2O

Ionic Bond Bohr Model: Li Bohr Model: O

Naming Ionic CompoundsMgO

Naming Ionic CompoundsMgO

Magnesium Oxide

Naming Ionic CompoundsCaCl2

Naming Ionic CompoundsCaCl2

Calcium Chloride

Naming Ionic CompoundsAl2O3

Naming Ionic CompoundsAl2O3

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!


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-


PCl3


PCl3

Phosphorous

Naming Covalent CompoundsRule 2: The

second element always gets a

prefix, uses the root of the word

and ends in-ide.


PCl3

Phosphorous


PCl3

PhosphorousTrichloride


Rule 3: The “o” or “a” at the end of

the prefix is dropped if the

element begins in a vowel.


N2O


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

prefix.


N2O

Dinitrogen

Naming Covalent CompoundsRule 2: The

second element always gets a

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


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.


N2O

Dinitrogen Monooxide


N2O

Dinitrogen Monoxide

Practice Time!

EXAMPLESCCl4As2O

Whiteboards

SO

Sulfur Monoxide

Nitrogen Dioxide

Dinitrogen Monoxide

Diphosphorous Pentoxide

PhosphorousPentachloride

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 TimeLucky you!

Exit Question1. Write the formula for:

Silicon dioxide Dihydrogen monoxide

2. Write the name for the following compounds:

CO2

NH3

take out dhmo letter please

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