16Nov 2014 by Vincent Summers 1 Comment

Organic Chemistry: What is Ring Strain?

Chemistry
[caption id="attachment_16313" align="alignright" width="440"] Cyclopropane suffers from ring strain.[/caption] Carbon ring strain? What is that? Let's begin at the beginning. The element carbon is one of a small number of elements that can bond to itself repeatedly. Compare gases such as oxygen (O2), called diatomic gases because generally only two atoms unite. Oxygen is exceptional in that it does form the triatomic molecule, ozone (O3). However, carbon can form even lengthy chains. Thus, carbon can form, not only methane (CH4), but ethane (H3C-CH3), propane (H3C-CH2-CH3), butane (H3C-CH2-CH2-CH3), pentane (H3C-CH2-CH2-CH2-CH3), and so on. Curiously, carbon can also close those chains to form rings, much as a woman can close a string of pearls about her neck using a clasp. [sc name="MidArticleAdsense"] Cyclization Although methane cannot so close, nor can ethane, the…
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10Nov 2014 by Vincent Summers No Comments

What Are Hybrid Atomic Orbitals?

Chemistry
[caption id="attachment_6346" align="alignright" width="440"] Pre-hybridization 1s, 2s, 2px, 2py, and 2pz atomic orbitals.[/caption] An atom consists of two components - a nucleus and its orbiting electrons. Nuclei contain neutrons and protons bound together by nuclear force. Electrons travel in well-defined atomic orbitals outside the nucleus. Orbitals come in different shapes. They contain up to two electrons each. A collection of orbits forms an electron shell. Atoms can have more than one shell. Orbitals and shells are identified by letters and numbers. The details are beyond the scope of this article; however, atoms begin filling electron orbitals in the order, Orbitals: s, p, d, f... Shells: 1, 2, 3, 4... First Elements Thus the first ten elements fill their orbitals and shells, Hydrogen 1s¹ Helium 1s² Lithium 1s² 2s¹ Beryllium 1s²…
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