Warm up Name the following compounds Cu 2 SCa(NO 3 ) 2 2. Write the chemical formula for these compounds Cobalt (III) Sulfide Zinc (I) Phosphate Agenda -Correct homework -Notes Chp 6-3 Lewis dot -Practice WS Homework Finish Lewis dot WS Oct 24 – Online HW (57Qs) Oct 27 - Extra credit due

1.Circle the questions you got wrong and correct your homework 2.Pick two questions that you got wrong and explain how to correctly do it on the back of the worksheet

Chp 6-3 Lewis Dot structure How do we determine which elements will combine to make bonds?

Electron Distribution in Molecules Electron distribution is depicted with Lewis structures (electron dot) showing valence electrons Show the number of bond in the covalent compound (In ionic bonds, it was decided with charges) G. N. Lewis

Lewis Structures 1)Write the element symbol. 2)Starting at the right, draw 4 electrons, or dots, one on each side around the element symbol.

Lewis Structures Try these elements on your own: a)H b)P c)Ca d)Ar e)Cl f)Al

Lewis Structures On your worksheet, try these elements on your own: a)H b)P c)Ca d)Ar e)Cl f)Al

Lewis Structures On your worksheet, try these elements on your own: a)H b)P c)Ca d)Ar e)Cl f)Al

Lewis Structures On your worksheet, try these elements on your own: a)H b)P c)Ca d)Ar e)Cl f)Al

Lewis Structures On your worksheet, try these elements on your own: a)H b)P c)Ca d)Ar e)Cl f)Al

Lewis Structures On your worksheet, try these elements on your own: a)H b)P c)Ca d)Ar e)Cl f)Al

Lewis Structures On your worksheet, try these elements on your own: a)H b)P c)Ca d)Ar e)Cl f)Al

Bond Formation A bond can result from an overlap of atomic orbitals on neighboring atoms. Cl HH + Note that each atom has a single, unpaired electron. H Cl

Bond and Lone Pairs Valence electrons are distributed as shared or BOND PAIRS and unshared or LONE PAIRS. Valence electrons are distributed as shared or BOND PAIRS and unshared or LONE PAIRS. HCl lone pair (LP) shared or bond pair This is called a LEWIS structure.

All atoms want to have 8 valence electrons (except H, only needs 2) Obtain a total of 8 by sharing Example: Cl 2 CH 4 Sharing Electrons

Draw carbon tetrahydride, Draw carbon tetrahydride, CH 4 Draw Ethylene, C 2 H 4 Draw Hydrogen peroxide H 2 O 2 Example Lewis Dot for Compounds

Bond Formation Single bond - Cl 2 Double bond = CO 2 Triple bond N 2

Lewis structure help predict molecular shape Valence Shell Electron Pair Repulsion (VSEPR)

Assignments Lewis dot worksheet due next week Online HW Summary

Warm up Name the following compounds: SCl 2 FeO 2. Write the chemical formula for these compounds diphosphorus dihydridecalcium nitride 3. Write the Lewis dot structure for the following: H 2 SPBr 3 C 2 H 2 Agenda -Go over Quiz -Binder Check List -Test Review/Online HW Homework Oct 19 – Test Chp 4, 5 & 6 Oct 20 – Online HW (58) Oct 23 – Binder Check

Quiz Answer 2. This statement is false (not true) adding electron doesn’t always result in the atom getting bigger. When going across the period, the atoms tend to get smaller in size.

Quiz Answer 3. Atoms can gain or lose electrons to become ions (has a charge) 4. Ba 2+ P 3-

Quiz Answer 5. -Ionic bond = electrons are transferred (one give one take) -Covalent bond = electrons are shared -Metallic bond = sea of electrons, they are free to move around, electrons are able to hop from one atom to another atom (any one of these answer is correct for metallic bond)

Quiz Answer 6. Transferring electrons resulted in a stronger bond thus requiring more energy to break apart.

Assignment Review for Test Online HW Complete binder for next week