Blake Lecture 11-5-08

Blake Lecture 11-5-08 - 1. Sp 2. Sp 2 3. Sp 3 – ANSWER (2...

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Blake 11-5-08 Chemistry 1307 Topics 1. Valence Bond Theory 2. Hybridization What? Why? 1. Ex 1: Which has the lowest lattice energy? 1. ScN 2. MgO 3. LiF (Li – 1+ F – 1-) - ANSWER 4. MgBr 2 How much energy is takes to break the bonds apart. Lowest charges = lowest lattice energy EX 2: Which has the highest lattice energy? 1. LiCl 2. RbCl 3. KF 4. LiF - ANSWER Small ions lead to high lattice energies Smaller radius leads to the larger lattice Ex 3: What is the shape of sulfite? 1. Bent 2. Trigonal Planar 3. Trigonal Pyramidal - ANSWER 4. Tetrahedral 5. T-Shaped 6. See-Saw SO 3 2- One loan pair What is Hybridization?
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New bonding theories were being developed based on orbitals and electronic configurations 1. To get energy levels right A bond is a result of orbital overlap 1. Interference of wavefunctons 2. Constructive interference results in more electron density between the nuclei Ex 4: What is the hybridization of N in NH 2 - ?
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Unformatted text preview: 1. Sp 2. Sp 2 3. Sp 3 – ANSWER (2 H’s and 2 loan pairs = tetrahedral) 4. Sp 3 d 5. Sp 3 d 2 Sp 2 Hybrids • When do we have them? 1. Small Atoms • What do they look like? 1. • S + p + p = sp 2 + sp 2 + sp 2 1. Need a triangle. Have to start with the orbitals your given/needed. • Law of conservation of orbitals Sigma and Pi • Depends on perspective 1. Sigma & Pi = σ (Sigma) π (Pi) Hybrid Orbitals • Used for making sigma (Single) bonds • Used for holding loan pairs • The “sigma framework” of the molecule, gives it structure • PI ARE USED FOR MULTIPLE BONDS Unhybridized p Orbitals • Can be used to make “extra” bonds • P orbitals will be parallel to each other, but perpendicular to the molecule • Sp hybrids – 2 unhybridized p • Sp 2- 1 unhybridized p • Sp 3- 0 unhybridized p • C 2 H 2 – sp hybridization...
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This note was uploaded on 03/22/2011 for the course CHEMISTRY 1307 taught by Professor Tamarahanna during the Spring '09 term at Texas Tech.

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Blake Lecture 11-5-08 - 1. Sp 2. Sp 2 3. Sp 3 – ANSWER (2...

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