 and  bonds

Visit: Log in and select Chem 1A. When prompted, type the word of the day: sigma Ensure when asked if you will share your location you select “allow”. Visit: Sign in MasteringChemistry account name When prompted, type session ID: Please turn off all downloads. You can usually pause them by clicking on them and clicking pause. Facebook and youtube are officially banned during class time (this is not me micromanaging, it’s a legit internet issue as told to me by OIT). Remember back 5 rows of even side are no seating zones Visit: Word of the day: sigma LearningCatalytics: session ID: Note: “extra examples” for this will be posted shortly after class! Thanks for your patience with these.

SURVEY QUESTIONS Review: How to determine polar and non-polar? Step 1: Determine if any bonds are polar (i.e. is there a difference in electronegativity) Step 2: Decide if the polar bond cancel each other or not. Today’s Is it possible to have more than two pi bonds or is that the highest allowed number of pi bonds? For this class, definitely just 2 pi bonds per bond max (i.e. a triple bond is made of 1  and 2  ) I have questions about bonds and how to determine if they are head to dead or side to side  Are always end-on-end, and  are always side on side. So the first bond is end-on-end and the second and third (i.e. in double and triples) are side-on-side Visit: Word of the day: sigma LearningCatalytics: session ID:

EXTRA CREDIT Coursera and Video Assignments: Turn in hard copies of each at the final Exam Please! Office hour change today only : 1-2 RH 214 Visit: Word of the day: sigma LearningCatalytics: session ID:

“QUIZ QUESTION 1” (OF THE NON-SCARY LOW STAKES VARIETY) A single bond is the: A) single bond only. B) single bond and one of the bonds in any double or triple bond. C) only located in double bonds D) only located in triple bonds. Visit: Word of the day: sigma LearningCatalytics: session ID:

“QUIZ QUESTION 1” (OF THE NON-SCARY LOW STAKES VARIETY) A ______ bond is not freely rotatable. A) single bond only. B) double bond C) triple bond D) double or triple E) none of the bonds are freely rotatable. Visit: Word of the day: sigma LearningCatalytics: session ID:

SIGMA BONDS Visit: Word of the day: sigma LearningCatalytics: session ID:

SIGMA BONDS Visit: Word of the day: sigma LearningCatalytics: session ID:

SIGMA BONDS Visit: Word of the day: sigma LearningCatalytics: session ID:

 BONDS Sketch (badly is fine) what the bonds in the following molecules look like according to valence bond theory: H2H2 Cl 2 HCl OR Visit: Word of the day: sigma LearningCatalytics: session ID:

 BONDS Sketch (badly is fine) what the bonds in the following molecules look like according to valence bond theory: O2O2   Visit: Word of the day: sigma LearningCatalytics: session ID:

Going back to our Previous Structures. (we’ll skip some of them and I’ll alter a few for this purpose. ) C H H O What is the hybridization on carbon? sp 2 What are the orbitals used for each type of bond? Visit: Word of the day: sigma LearningCatalytics: session ID:

ATOMIC ORBITAL HYBRIDIZATION s ppp sp 2 hypridization sp 2 p E Visit: Word of the day: sigma LearningCatalytics: session ID:

Going back to our Previous Structures. (we’ll skip some of them and I’ll alter a few for this purpose. ) What are the orbitals used for each type of bond?    C’s sp 2 and O’s p C’s sp 2 and H’s s  C’s p and O’s p   Visit: Word of the day: sigma LearningCatalytics: session ID:

Faster Examples: sp 3 sp 2 sp 3 What is the hybridization on each “central” atom (Ns and C)? What orbitals from each atom is each bond formed with? Each nitrogen hydrogen bond (they all happen to be the same here)? Each carbon nitrogen bond (they all happen to be the same here)? The carbon oxygen bond?  Nitrogen’s sp 3 and Hydrogen’s s  Nitrogen’s sp 3 and Carbons sp 2  Oxygen’s p and Carbons sp 2  : Carbon’s p and oxygen’s p Visit: Word of the day: sigma LearningCatalytics: session ID:

Faster Examples: What is the hybridization on each “central”, what is each bond formed with? sp 3 sp C-Cl: Cl’s p orbital, carbons sp orbital C-N:  : carbons’ sp and nitrogen’s p  s  : carbon’s p and nitrogen’s p P-Br: Br’s p orbital, phosphorous’s sp 3 orbital Visit: Word of the day: sigma LearningCatalytics: session ID:

sp 3 sp 2 sp 3 Faster Examples: What is the hybridization on each “central”, what is each bond formed with? H-O bond: H’s s orbital, and O’s sp 3 O-N single bond: O’s sp 3 and N’s sp 2 O-N double bond:  : N’s sp2 and O’s p  : N’s p and O’s p H-S bond: H’s s orbital, and S’s sp 3 C-H bond: C’s sp 3 and H’s s orbital C-I bond: C’s sp 3 and I’s p orbital Visit: Word of the day: sigma LearningCatalytics: session ID:

Going back to our Previous Structures. (we’ll skip some of them and I’ll alter a few for this purpose. ) N O O N O O     N’s sp 2 and O’s p N’s sp 2 and O’s p  N’s p and O’s p

sp 2 sp 3 Faster Examples: What is the hybridization on each “central”, what is each bond formed with? All C-H bonds: Carbon’s sp 2 and Hydrogen’s s All C-C  bonds: carbon’s sp 2 and carbons sp 2 All C-C  bonds: carbon’s p bonds delocalized over entire ring