Exam 3 Review Slides 1-5 (Chap 9)

Exam 3 Review Slides 1-5 (Chap 9) - Chapter 9: Molecular...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 4
Background image of page 5
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Chapter 9: Molecular Geometry and Bonding Theory Lewis structures help us understand the number and types of bonds between atoms, but they do not show us the r -' ‘ t ‘- Example: CCI4 VSEPR: Electrons will “get out of each other’s way” as much as possible. 1. How many electron domains exist on the central atoms of each of the following compounds? a. I. _. 03 We use the # of electron domains around the central atom to determine the electron-domain geometry of the molecule. 2. What is the electron domain geometry of the following molecules? a. NH3 b. Os When determining the molecular geometry of a molecule, we dififefini‘iate between bonding and nonbonding electron pairs. 3. What is the molecular geometry of the following molecules? a. NH3 b; 03 ' ' *-' 1 II ! y I. r}- I v / fi-fi -- {KAI .- .. Some steps to remember when drawing molecules: 1 1:») V L-ls. / 2. 1-1 - 3. M r .. Electron domains for nonbondlng electron pairs exert /. .2. - i' ‘ repulsive forces on adjacent bonding electron pairs. g 4. Use the VSEPR model to predict the molecular geometry of the following molecules. What can you say about bond angles? a. NOg' I I b. |F5 " l I h ‘i' ' _‘ .. .I-r_ _ _ (I. I [i_ . - 5:) c. C|F3 i 1‘ (:1. SF4 ,‘-i‘- _ -- I f j I 11:. f ‘ ‘ i _5. Predict the approximate bond angles in. a molecule of acetic acid. As the difference in electronegativity between two atoms increases, so does the The overall dipole moment of a molecule is the sum of its bond dipoles. If two polar bonds directly oppose one other, thexcancel. — ‘h' — —'—'.=|-' Example: 002 a) 6. Draw the individual dipoles w__ithin_the following molecules. Then draw the overall dipole of the molecule or indicate none exists. a. NF3 b. 302 i X 7)" VALENCE IBOND THEORY & HYBRID ORBITALS ln valence-bond theory, we Visualize the buildup of v . ._-_--' . - - i between two nuclei as occurring when a valence atomic orbital of one atom overlaps with that of another atom. Example: H2, HCI, |2_ 7. Explain the optimum distance between the two bonded nuclei in any covalent bond. ‘ (decrease in energy as they get closer, but not too close...) -- i - 6‘ £1 "1' _‘.__',."\- .iuf ' ' ‘\ _ .. .\ ‘ I “ t__ The process of miXing atomic. orbitals is called ,- .t - - .- - . Whenever we mix a certain number of atomic orbitals, we get th " ' ' ' ' - of hybrid orbitals. . _-\‘ 'fo ' Example: BF3 .- me; What happened to the p-orbital we didn’t use? _ _. t I I - _:__ -‘ _ .i J r" ' j' ;i 8. Use orbital diagrams to ekplain'how the central atom of CH4 is hybridized to form the covalent bonds of which it is composed. I Orbital hybridization has very limited _ . . ' _' i We determine the hybridization of a molecule only after we ’vel determined the molecule’s -' .. - - -- " 9. _'t_ 10. 11. I/ . , . ~. ' I -..= ' .’ r- '. -. '. l [;;c.t‘-.,2‘- - I \ ' i425: " " Indicate the hybridization of orbitals employed by the central atom. .‘x 4' +- b. SFS l \ | \ iv’ ‘ _ . l -- -:~, , 1:3 ‘- “I. _ : -_ y .. 1. All covalent bonds‘éonsist'of‘etéQeet one additional bonds are ' g I; . .flAll Where does the pi bond in 02H4 exist in relation to the intermolecular axis? Draw a molecule exhibiting the correct geometry of the pi bond in this molecule. Draw diazine (N2H2) molecule in which all of its bond are clearly shown. Describe each bond’s orbital overlap. y". ‘ ’1 r III Li. I. R f 4/ -. '/ .. I. I .t’; M f If“ —_-v .-_I]I L a. . ‘-.~.__.-: .0 '\\ r, {I - _ I I I I _ I _ . -'I . . .. I I . u .. 2 t - ‘ w ”- '-/' til I _, ! ...
View Full Document

Page1 / 5

Exam 3 Review Slides 1-5 (Chap 9) - Chapter 9: Molecular...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online