Archive for the ‘Chemistry’ Category

Chemistry: Calculate the Mass of an Atom [Video]

Sunday, April 15th, 2012

Chlorine Atom
I created and uploaded this video to youtube back in 2009. This video demonstrates how to solve a simple chemistry problem. I calculate the mass of a Chlorine atom. (more…)

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Python – Implementing Caching in Your Applications via Dictionaries

Friday, April 6th, 2012

Periodic Table of the ElementsIn this blog I demonstrate how you can implement and take advantage of caching in your Python scripts/applications.

Caching allows you to complete tasks more rapidly by storing and reusing results for repeated operations using the same criteria. For example, consider a function that takes several arguments and performs a complex calculation. What if you passed the same arguments to this function ten times; well, without caching, the same operation and complex calculation will be performed ten times. (more…)

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Interesting Facts: Man-made Urea

Tuesday, March 30th, 2010

Urea

Urea - a molecular compound in human urine

Friedrick Wohler

Friedrick Wohler


In the past, organic compounds were restricted to those that could be produced only from living entities. These compounds were thought to contain a “vital force” based on their natural origin. This “vital force” concept was disproved in 1828 by a Geman chemist, Friedrick Wohler. Wohler synthesized a molecular compound found in human urine called urea. To accomplish this task he used the molecular compounds ammonia and cyanic acid. Urea became the first organic molecule synthesized by a chemist.

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