Chemistry Page 8

In 1817, an aging Swedish chemist was pouring over his work on a late afternoon in Stockholm, Sweden. He was analyzing a strange ore named Petalite that had been procured from an island off the coast of Sweden called Uto. The ore Petalite (which is now recognized to be LiAl(Si2O5)2) had been discovered by a…

Air Quality Air Quality & Dispersion Today, the air quality aspect of ARL research is by far the dominant theme, but distinctions among the themes remain somewhat vague. For example, the models developed for emergency response purposes are among those used for air quality prediction. The Air Quality and Dispersion theme is one of the…

Distillation Andrea Pausma October 1, 2001 I.Introduction The process of distillation has been used by humans for years to create alcoholic beverages. Distillation is the process of boiling a pair of liquids with different boiling points and then condensing the vapors above the boiling liquid in an attempt to separate them. One might suspect that…

Homologous Series: An homologous series is a set of compounds whose components differ by a single repeating functional group. In the case of (straight chain) alkanes, CH2. Their general formula is CnH2n+2. The chemical properties of the individual members of an homologous series are similar and they show a gradual change in physical properties. Hydrocarbons:…

Each spiraling strand is comprised of a sugar phosphate backbone and attached bases connected to a complimentary strand. The complimentary strand is connected by non-covalent hydrogen bonding between paired bases. The bases are adenine, thymine, ctyosine, and gaunine. The fundamental building block of DNA is the nucleotide. The nucleotide has three parts. A nitrogen-containing pyrimidine…

Computers reproduce information at almost no cost. A push is well underway to invent devices that manufacture at almost no cost, by treating atoms discretely, like computers treat bits of information. This would allow automatic construction of consumer goods without traditional labor, like a Xerox machine produces unlimited copies without a human retyping the original…

Optical microscope utilized for visually detecting the presence of a microscopic object in a sample and determining the posture of object in sample, so repeated visual observation of object which is quiet an active role due to the fact that it gives a qualitative real data that you see. Not only does it provide an…

The objective of this experiment is to determine the percentage of calcium carbonate (CaCO _3) in toothpaste, by performing back titration since calcium carbonate is insoluble in water. An exact volume of hydrochloric acid will react with a weighted portion of toothpaste sample (CaCO _3). After reaction is complete, the excess hydrochloric acid is back…

Enzymes are a biological reaction that remains unchanged, most enzymes are chemical of hydrogen peroxide which changes that release energy and build new materials for cells and tissues. Each enzyme has its own specific shape, but without enzymes, the digestive system will take weeks and weeks to digest food. When the enzyme changes shape it…

By decreasing the density while maintaining strength and without adversely affecting cost. Introducing new aggregate sin to the mixed sign is a common way to lower a concrete’s density. Normal concrete contains four components, cement, coarse aggregate, fine aggregate and water. The coarse aggregate (granite or gravel) and fine aggregate (sand) are the components that…