Friday, February 6th, 2015 Classroom expectations: Wear Kenwood ID. Cell phones, music players, and headphones are put away. Food is disposed of or put away. Dressed appropriately. Notebook is out and you are ready for today’s class. HW: #12 G, H, and J only; finish classwork activity Objective: We will apply the octet rule to determine the Lewis dot diagrams for covalent compounds Catalyst: F. more acidic. G. less acidic. H. equally acidic. J. less acidic for pepsin, but more acidic for trypsin. ***Table of Contents 2/5 POGIL and Notes: Naming Molecular Compounds 111 2/6 Table: Molecular Geometry VESPER 112 2/6 Classwork: Drawing Covalent Compounds 113

Friday, February 6th, 2015 ***Table of Contents Classroom expectations: Wear Kenwood ID. Cell phones, music players, and headphones are put away. Food is disposed of or put away. Dressed appropriately. Notebook is out and you are ready for today’s class. HW: #12 G, H and J only; finish classwork packet Objective: We will apply the octet rule to determine the Lewis dot diagrams for covalent compounds Catalyst: A. A technique of adding titrant to a sample solution. B. A substance showing the conductivity of a solution. C. A substance changing color to indicate a solution being neutral. D. There is not enough information to determine. ***Table of Contents 2/5 POGIL and Notes: Naming Molecular Compounds 105 2/6 Table: Molecular Geometry (VESPER) 106 2/6 Classwork: Drawing Covalent Compounds 107

Announcements No tutoring today. Tutoring Next Week: Monday and Thursday Quiz Tuesday

Agenda Catalyst/Announcements Notes on how to draw covalent compounds. Practice drawing covalent compounds.

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?

CO2 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 CO2 look like anyway???

Steps for Drawing Covalent Compounds Example 1.) Determine the total number of valence electrons ALL of the atoms have. CO2 = C + O + O 4 + 6 + 6 CO2 has 16 e-

Steps for Drawing Covalent Compounds Example 2.) Determine the total number of valence electrons ALL of the atoms want. CO2 = C + O + O 8 + 8 + 8 CO2 wants 24 e-

Steps for Drawing Covalent Compounds Example 3.) Calculate the number of electrons the compound will share. Equation: wants – has = shared 24 – 16 = 8 8 e- will be shared in CO2

Steps for Drawing Covalent Compounds Example 4.) Determine the central atom. Single atom Carbon Least Electronegative atom C

Steps for Drawing Covalent Compounds Example 5.) Put the central atom in the middle and write the other atoms around. O C O

Steps for Drawing Covalent Compounds Example 6.) Draw a single bond between the central atom and the outer atoms. O C O

Steps for Drawing Covalent Compounds Example 7.) Check your equation to make sure enough electrons are being shared. If not, draw in more bonds. CO2 shares 8 e- O C O

Steps for Drawing Covalent Compounds Example 8.) Fill in the non-bonding electrons on the outside atoms to fulfill the octet rule. (Remember: Hydrogen only needs 2 electrons!) CO2 has 16 e- O C O

Steps for Drawing Covalent Compounds Example DISCUSS: Do all of the atoms have the number of electrons that they want??? CO2 has 16 e- O C O

Additional Examples Trioxide – AKA Ozone (O3) Cyanide (CN-)

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