Monday, February 9 Classroom expectations: th , 2014 HW: Agenda Questions/Simulation 1.Wear Kenwood ID.

2.Cell phones, music players, and headphones

Objective 6: We will create Lewis dot structures for covalent compounds.

are put away.

Catalyst: Name the following:

3.Food is disposed of or put away.

a.) CCl 4

4.Dressed appropriately.

5.Notebook is out and you are ready for today

’

s class.

b.) MgO c.) N 2 O

***Table of Contents

2/9 2/9 2/9 2/9 Week 22 Catalyst (*draw in NB) Week 22 Agenda (*online) Drawing Covalent Compounds Molecular Geometry (VSEPR) 114 115 116 117

Announcements

• Tutoring today.

• Simulation/Agenda Questions due Friday!!! (Turn this in early!!!) • Quiz tomorrow over covalent/ionic properties (study both sides of pg 109!) and naming (study 112 and 113!)

Agenda

• Catalyst/Announcements • Notes on how to draw covalent compounds.

• Practice drawing covalent compounds.

Homework Check

7.) Ionic High melting pt v. Covalent Low melting pt not malleable conducts electricity in water not malleable does not conduct electricity in water

Homework Check

8) a. H 2 O b. PH 3 c. CCl 4 d. CO 2

Homework Check

8) e. Cl 2 O 7 f. Si 2 Br 6 g. NO 3 h. P 3 O 5

Homework Check

9) a. dinitrogen pentoxide b. carbon tetrahydride c. nitrogen dioxide d. hexacarbon hexahydride

Homework Check

9) e. selenium hexabromide f. boron trifluoride g. carbon monoxide h. bromine trioxide

Review

What’s wrong with this picture?

Review.

• How would you draw a Lewis dot structure for NaCl?

Review.

• Why do we put brackets around the chlorine atom in NaCl?

Review.

• How are covalent bonds different from ionic bonds?

CO

2

• Carbon dioxide is the gas that we exhale out of our bodies each and everyday. Although it is invisible to our eyes, it does have a distinct structure. So what does

CO 2 look like anyway???

Steps for Drawing Covalent Compounds

Steps

1.) Determine the total number of valence electrons ALL of the atoms have.

Example

CO 2 = C + O + O 4 + 6 + 6

CO 2 has 16 e -

Steps for Drawing Covalent Compounds

Steps

2.) Determine the total number of valence electrons ALL of the atoms want.

Example

CO 2 = C + O + O 8 + 8 + 8

CO 2 wants 24 e -

Steps for Drawing Covalent Compounds

Steps

3.) Calculate the number of electrons the compound will share.

Equation: wants – has = shared Example

24 – 16 = 8

8 e will be shared in CO 2

Steps for Drawing Covalent Compounds

Steps

4.) Determine the central atom.

• Single atom • Carbon • Least Electronegative atom

Example

C

Steps for Drawing Covalent Compounds

Steps

5.) Put the central atom in the middle and write the other atoms around.

Example

O C O

Steps for Drawing Covalent Compounds

Steps

6.) Draw a single bond between the central atom and the outer atoms.

Example

O C O

Steps for Drawing Covalent Compounds

Steps

7.) Check your structure to make sure enough electrons are being shared. If not, draw in more bonds.

Example

CO 2 shares 8 e O C O

Steps for Drawing Covalent Compounds

Steps

8.) Fill in the non-bonding electrons on the outside atoms to fulfill the octet rule.

(Remember: Hydrogen only needs 2 electrons!)

Example

CO 2 has 16 e O C O

Steps for Drawing Covalent Compounds

Steps

DISCUSS: Do all of the atoms have the number of electrons that they want???

Example

CO 2 has 16 e O C O

Additional Examples

• Trioxide – also called Ozone (O 3 ) • Cyanide (CN )

Practice

• Work with your elbow partner to answer practice problems 1-12.

Tuesday, February 10 Classroom expectations: th , 2015 HW: Agenda Questions/Simulation 1.Wear Kenwood ID.

2.Cell phones, music players, and headphones

Objective 6: We will create Lewis dot structures for covalent compounds.

are put away.

3.Food is disposed of or put away.

4.Dressed appropriately.

5.Notebook is out and you are ready for today

’

s class.

Catalyst: Open your notebooks to page 116 and complete problems 1-6 on the second page.

***Table of Contents

2/10 Nonpolar, Polar, and Ionic Bonds 118

Wednesday, February 11 Classroom expectations: th , 2015 HW: Agenda Questions/Simulation 1.Wear Kenwood ID.

2.Cell phones, music players, and headphones

Objective 6: We will create Lewis dot structures for covalent compounds.

are put away.

3.Food is disposed of or put away.

4.Dressed appropriately.

5.Notebook is out and you are ready for today

’

s class.

Catalyst: Open your notebooks to page 116 and next to all of your Lewis dot structures: a.) Write nonpolar or polar.

***Table of Contents

b.) Write the name of the geometry they would form.

2/10 Nonpolar, Polar, and Ionic Bonds 118

Announcements

• No Tutoring Today • Simulation/Agenda Questions due Friday!!! (Turn this in early!!!) • Quiz pushed back to tomorrow over covalent/ionic properties (study both sides of pg 109!) and naming (study 112 and 113!)

Agenda

• Catalyst/Announcements • Practice drawing covalent compounds.

• Molecular Geometries • Polarity

Nonpolar Covalent, Polar Covalent, and Ionic Bonds 118

DEMO

• Why doesn’t oil and water mix?

DEMO

• Water is a POLAR molecule.

• Oil is a NONPOLAR molecule.

Observe

• Open your notebooks to page 117.

• Observe. What are some differences you notice between polar and nonpolar molecules?

Observe

• Open your notebooks to page 117.

• Observe. What are some differences you notice between polar and nonpolar molecules?

Nonpolar Molecules

• Nonpolar molecules are symmetrical. They look the same on all sides.

Polar Molecules

• Polar molecules are asymmetrical. Both sides of a molecule are not mirror images of one another.

“Polar”

• A pole refers to 2 sides with a different charge.

• Example: earth’s magnetic field

“Polar”

• A pole refers to 2 sides with a different charge.

• Example: magnets

“Polar”

• A pole refers to 2 sides with a different charge.

• Example: polar molecules

Why don’t oil and water mix

?

• Water is polar. Therefor it has a charge. Other molecules with a charge will react with water and dissolve.

• Vegetable oil is nonpolar. It does not have a charge and does not react with water.

Vegetable oil Water