Once you’re in, you’re in. When the bell rings, voice at zero, working on the Do Now in Do Now Form. Pick up daily handouts. Pick up turned back docs. Turn in your TEST CORRECTIONS and have OUT ON YOUR DESK YOUR HW!! Do Now 10/9/2013 Write the compounds for the following: Silicon dioxide Carbon tetrachloride Diboron tetrabromide Write an equation for Lead- 209 that undergoes alpha decay

Write the compounds for the following: Do Now Review 10/9/2013 Write the compounds for the following: Silicon dioxide Carbon tetrachloride Diboron tetrabromide Write an equation for Lead- 209 that undergoes alpha decay

Tutoring and Makeup Work Tuesday/Thursday this week afterschool; Wednesday at Lunch THREE weeks left in the quarter – if your name is on the board , you owe me a quiz or a test!! If you have a zero and you think you turned it in I have passed it back to you and you need to turn in again either graded or with proof it was turned in on time for full credit

Homework VSPER Model worksheet (indicate polarity if there is any and major intermolecular forces)** Finish 2 activity questions if not finished in class** **Graded

Upcoming Dates 10/9/2013 – Nomenclature and Formula Quiz 10/10/2013 – Naming and Formula Test

Objectives   SWBAT Apply the VSEPR theory to determine molecular geometries and bond angles Describe bond polarity and relate to polar/nonpolar molecules.

Review Handout from yesterday 1st block – Review table on geometries and bond angles Everyone else review HW for 5 minutes

Marshmallow Activity Assigned groups (30)

Forces Video and Video Guide http://www.youtube.com/watch?v=S8QsLUO_tgQ

Relative Magnitudes of Forces The types of bonding forces vary in their strength as measured by average bond energy. Strongest Weakest Covalent bonds (400 kcal) Hydrogen bonding (12-16 kcal ) Dipole-dipole interactions (2-0.5 kcal) London forces (less than 1 kcal)

Hydrogen Bonding in Water

Polarity A molecule, such as HF, that has a center of positive charge and a center of negative charge is said to be polar, or to have a dipole moment. H F + -

Electronegativity (mini table) Across a period: the electronegativities generally increase from left to right across a period with the Group VII element having the highest value for the period. Down a group: the electronegativities generally decrease from top to bottom down a group. Francium is the element with the lowest electronegativity.

Electronegativity (mini table) The difference in electronegativities of two elements can be used to predict the nature of the chemical bond. Bond type can be described as belonging to one of three classes: nonpolar covalent polar covalent ionic When differences are 1.7 or greater, the bond is usually ionic. Less than 1.7, the bond is usually covalent, and unless the difference is less than 0.5 the bond has some degree of polarity. Differences of less than 0.5 are considered to be nonpolar.

Dipole-Dipole Attraction Attraction between oppositely charged regions of neighboring molecules. Dipole-dipole attraction in hydrogen chloride, a gas that is used to make hydrochloric acid (use mini table)

Revisit Homework Practice Add in polarity and forces

Quiz When you finish bring me your quiz Pick up turned back docs (black file box) Work on VSEPR HW (adding in polarity and forces)