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Catalyst – March 22/2, 2013

Catalyst – March 22/2, 2013. Monday Mystery Element! Located in the f-block Named for an asteroid which excited the science world in 1801 Similar to La. mystery element…. CERIUM. Discovered by Berzelius, Hisinger, and Klaproth

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Catalyst – March 22/2, 2013

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  1. Catalyst – March 22/2, 2013 Monday Mystery Element! • Located in the f-block • Named for an asteroid which excited the science world in 1801 • Similar to La

  2. mystery element… CERIUM • Discovered by Berzelius, Hisinger, and Klaproth • One of the most abundant and reactive rare earth metals • Its oxide is used to coat the walls in self-cleaning ovens

  3. Today’s Agenda • Catalyst • ACT Prep: Answers 4-7 • New Groups • Notes and Work Time • Intro to Covalent Compounds • Covalent Bond Formation (more LDS’s!) • Exit Question HW: Workbook pages 96-97

  4. Projector Front Door 1st Period Group 2 Chaz, Shelby, Shawn, Diante Group 3 Myra, Gabby, Wesley Group 1 Jada, A’lexis, Monique, Rebecca Group 5 A’Keelah, Manuel, Denise Group 6 Briana, Darnell, Quanisha Group 4 Kara, Luis, Erica Group 7 Michael, DaJa, Andrew, Aislinn Group 9 Lindsey, Darius Group 8 Jerry, Chris, Darren

  5. Projector Front Door 2nd Period Group 2 Kelsey, Lawuan, Coty, Brittney Group 3 Jalyn, Markel, Courtney, Chris Group 1 Kayla, Mariah, Unique, Brian Group 4 Shay, Oscar, Stephanie, Destinee Group 6 Kennedy, Branger, TraMichael, Keyouna Group 5 Diamond, Kyndel, Zac, Kalyn, Dustin

  6. Projector Front Door 4th Period Group 2 Blanca, Joe, Tiff, Shayann Group 3 Zavonte, Ashley L., Deante, Briana Group 1 Kelly, Jasmine, Shae, Aldren Group 5 Realitee, Abby, Stephen, Kamaria Group 4 Amber, James, Johnny, David Group 6 Anh, Eric, Berta, Tiara Group 9 Group 8 Jemaria, Peyton, Mishael, Ashley B. Group 7 Maya, Kristian, Brooke, Balen

  7. LESSON TITLE: COVALENT BONDING – CHARACTERISTICS AND LDS

  8. Today’s Objectives • SWBAT describe characteristics of covalent compounds. • SWBAT draw Lewis Dot Structures for covalent compounds.

  9. What’s the difference between ionic and covalent compounds? • It is important to understand the differences between ionic and covalent compounds • This week, I want you to learn about covalent compounds, but I also want you to focus on comparing ad contrasting ionic and covalent

  10. Covalent Compounds in da House! • Covalent compounds are EVERYWHERE! • Household cleaners (Ammonia) • Water! • Salad dressing • Political debate! (think greenhouse gases)

  11. How do covalent bonds form? • Key Point #1: When covalently bonded, atoms share valence electrons to achieve full valence shells (and satisfy the octet rule). • Let’s look at Lewis Dot Structures again!

  12. How to Draw Covalent LDS • Key Point #2: To draw a LDS for a covalent compound (molecule), you must “pair up” or “connect” single electrons.

  13. Rules for Drawing Covalent LDS • Count the number of valence electrons you have to work with (can draw individual LDS). • Put the least electronegative atom in the center (except H). • Use pairs of electrons to form bonds between atoms. • Use remaining electrons to complete octets. • If you run out of electrons, introduce multiple bonds to get octets. • To finish, draw bonds as lines (2 dots per line).

  14. Single Bonds • Single covalent bond: one pair of shared electrons (two electrons) • Atoms may be the same • H2, F2, Cl2, Br2, I2, O2 • Atoms may be different • HF, HCl, HBr, HI =

  15. Formation of Single Covalent Bonds Examples H2 F2 HCl (chlorine)

  16. Formation of Single Covalent Bonds Your Turn! Cl2 HBr

  17. Tricks! • Central atom: in the center of a molecule, usually has lower electronegativity • Terminal atom: not in the center of a molecule Hydrogen will NEVER be a central atom!

  18. Formation of Multiple Single Bonds Examples NH3 SeCl2

  19. Formation of Multiple Single Bonds Your Turn! NF3 CH4 CH3Cl

  20. Draw the Lewis Dot Structures for the covalent compounds to the right  Br2 HI PH3 H2S CCl4 SiH4 Extra Practice!

  21. Lewis Dot Structure Classwork • Doooo it!

  22. Exit Question • What is one characteristic of covalent compounds? • Draw the acid HF. Leave Classwork in folder! Bring up tickets! HW: Workbook pages 96-97 DOOOOOO IT!!!!

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