Chemical formula& total valence e-PCIElectron Group Geom.BondBond PolarityMoleculeLewis StructureModel Sketch& Molec. Geom.Angle(show calc)PolarityCH4SiOCH,0

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Answered: Chemical formula & total valence e-…

Organic Chemistry: A Guided Inquiry

2nd Edition

ISBN:9780618974122

Author:Andrei Straumanis

Publisher:Andrei Straumanis

Chapter2: Lewis Structures

Section: Chapter Questions

Problem 12CTQ

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Consider the incomplete orbital representation of O2 , below right. a. Identify which lobes are hybrid orbitals (identify the type) and which lobes arep orbitals. b. Use dotted lines to show any bonds. c. Use up or down arrows to show electron occupation of each hybrid orbital or bond.
Which of the p orbitals do you think contributes the most inthe mixing that leads to the right-most sp3 hybrid orbital in thesecond row of the figure?
Represent the bonding in each molecule or ion by drawing the orbitals (hybridized and unhybridized) of each atom in the bond. Label the σ and π bonds and label each bond by the orbitals that it is made from. For instance, the C–H bond in CH4 would be made from the overlap of: C (sp3) – H (1 s). You may draw the hybridized sigma orbitals as sticks and the unhybridized p-orbitals as lobes for clairity and ease. a. HONO b. CH3 CCH c. C3 H4 d. C2 O4 2-
Complete the following table by providing theVSEPR-name and hybridisation (sp, sp2 or sp3) ofthe atom indicated by the arrow.
I am confused why this powerpoint slight says 'sideways overlap... leads to a p-bonding MO AND a p*-antibonding MO.' Isn't it one or the other? Why does it say AND? The orbitals can't have descrutive and constructive interaction at the same time right?
Compare the electron density in the 1g and 1u* molecular orbitals for H2+ shown in Figure 6.5 with the classical model for bonding for H2+ summarized in Figure 3.22b. Which of these molecular orbitals describes the bond in H2+ ?
Discuss the nature of the bonding in the nitrite ion (NO2) . Draw the possible Lewis resonance diagrams for this ion. Use the VSEPR theory to determine the steric number, the hybridization of the central nitrogen atom, and the geometry of the ion. Show how the use of resonance structures can be avoided by introducing a de-localized MO. What bond order does the MO model predict for the NO bonds in the nitrite ion?
The molecular ion HeH+ has an equilibrium bond length of 0.774 Å. Draw an electron correlation diagram for this ion, indicating the occupied MOs. Is HeH+ paramagnetic? When HeH+ dissociates, is a lower energy state reached by forming He+H+ or He++H ?
Consider the following flat drawing of methane (CH4) . a. What is HCH bond angle implied by this drawing if you assume it is flat? b. Are the electron domains of this flat CH4 spread out as much as possible? c. Use model materials to make a model of CH4 (methane). If you assembled it correctly, thefour bonds (bonding electron domains) of your model will be 109.5° apart. d. In which representation, the drawing above or the model in your hand (circle one) are theH’s of CH4 more spread out around the central carbon? e. Confirm that your model looks like the following drawing. The wedgebond represents a bond coming out of the page, and the dash bondrepresents a bond going into the page f. You will often see methane drawn as if it were flat (like on the previous page). Why is thismisleading, and what is left to the viewer’s imagination when looking at such a drawing?
Ozone (O3) has a nonzero dipole moment. In the molecule of O3 , one of the oxygen atoms is directly bonded to the other two, which are not bonded to each other. (a) Based on this information, state which of the following structures are possible for the ozone molecule: symmetric linear, nonsymmetric linear (for example, different OO bond lengths), and bent. (Note: Even an OO bond can have a bond dipole if the two oxygen atoms are bonded to different atoms or if only one of the oxygen atoms is bonded to a third atom.) (b) Use the VSEPR theory to predict which of the structures of part (a) is observed.
The stable molecular ion H3+ is triangular, with HH distances of 0.87 Å. Sketch the molecule and indicate the region of greatest electron density of the lowest energy MO.
(a) If the valence atomic orbitals of an atom are sp hybridized,how many unhybridized p orbitals remain in thevalence shell? How many π bonds can the atom form?(b) Imagine that you could hold two atoms that are bondedtogether, twist them, and not change the bond length.Would it be easier to twist (rotate) around a single σ bondor around a double (σ plus π) bond, or would they be thesame?

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Chemical formula & total valence e- Electron Group Geom. & Molec. Geom. Molecule Polarity Bond Bond Polarity (show calc) Lewis Structure Model Sketch Angle PCI, CH. SiOz CH,0