Survey of the Elements: 1. Element structures 2. Oxide structures 3. Cool things about some elements.

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Presentation transcript:

Survey of the Elements: 1. Element structures 2. Oxide structures 3. Cool things about some elements

A brief review of Lewis Acids and Bases

Boron: Group 3A Boron Hydrides: B x H y Simplest is “diborane” B 2 H 6 Draw its Lewis structure Also called “boranes”

Bonding in diborane Reactions of diborane

Other boron hydrides

Metalloboranes and carboranes

Boron vs. Aluminum Halides Boron trichlorideAluminum trichloride Predict the structure of BeCl 2.

Some Cool Hydroxides LiOH Mg(OH) 2 B(OH) 3 Al(OH) 3

Boron Oxides

Boron Nitride What is the Lewis structure similar to?

Industrial Production of Diamonds

Why is diamond formed, and not graphite? Reason 1. Reverse Reaction favors Graphite Instability H + diamond  CH4, but slower than CVD diamond growth H + graphite  CH4, but faster than CVD graphite growth Reason 2. Forward Reaction favors Diamond Formation sp 3 C atoms on surface (show structures) slow sp 2 graphite formation. H 2 (g)  2 H(g) H(g) + CH 4 (g)  CH 3 (g) + H 2 (g) CH 3 + C(diamond-H, surface)  Diamond-CH 3 + H

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