Proposed Demonstrations

I am aware of the difficulties of performing demonstrations (demos) in class due to strict safety measures. Nevertheless, demos should be an essential part of most courses in chemistry, certainly in introductory courses. Let me state the goals of the proposed demos for this opening lecture. 

The first goal is to demonstrate the magic of chemistry one molecule disappears and another one with different properties appears. The motto here is fun — the demos should be fun, and the demonstrator should be entertaining. The second goal is to prepare the minds of the students for the next lecture. 

There are demos on the Web (e.g., at the time of the writing of the book, I found a great site called Gorgeous chemical reactions http //io9.com/look-in-wonder -at-the-most-gorgeous-chemical-reactions-1651407454). Others can be found in the Journal of Chemical Education. Some great demos can come to mind by watching the BBC series The Elements. 

Before you perform any of the demonstrations, read carefully the hazards of the various chemicals, and the precautions in using them Any of the students who participates in the demo or is close to you when you perform the demo must wear a lab coat, gloves, and a pair of goggles Also, be sure to read all safety measures for laboratory work. Here are some suggestions for demos  

This demo is also called the buzzer experiment. It is based on the fact that some materials, like kitchen salt, have ionic bonds, while others, like sugar, have covalent bonds. Ionic bonds are made from two oppositely charged ions, like Na+ and CD in the common kitchen salt, and hence when a piece of this solid salt is connected to wires that are hooked to a battery and a buzzer, the ions move in the circuit, create current and cause the buzzer to buzz (or a radio to start playing). The sugar will not elicit any effect on the 

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Figure 20 shows values of the channel enthalpy extraction ratio for a number of channels. Enthalpy extraction (111) equal to that required by a proposed demonstration plant (112) has been achieved. Channels have performed generally in accordance with predictions. 

On a geological time scale, the important biologically mediated, permanent sequestration of C02 does not occur on land. It is in the oceans where limestone is formed that we would naturally seek the massive reservoirs of sequestered C02. Because the oceans will eventually be the natural sink for C02, concepts for directly sequestering C02 in the oceans have been proposed. But ocean sequestration and ocean fertilization have proven to be extremely controversial and politically unpopular. Proposed demonstration experiments to show the feasibility of C02 ocean sequestration... 

A.3 Proposed Demonstrations for Lecture 9 Colorful complexes of nickel... 

This proposal demonstrates that the sequence and conformation of the peptidal substrate can both play a critical role in protein N glycosylation. These factors combine to form a unique environment, providing the specificity and reactivity required to link an oligosaccharide to an asparagine carboxyamido nitrogen. Similar factors may play an important role in other protein processing reactions. 

As a result of these efforts to design highly sensitive resists, the concept of chemical amplification and in particular chemical amplification in positive-tone resists was proposed, demonstrated, and promoted for use in DUV photoresists by Ito in 1982. The basic concept of the chemical amplification scheme as it relates to photoresist materials is that a single initial photochemical event be used to tri er a cascade of many subsequent chemical reactions and transformations in the resist that lead to the desired development rate change between the exposed and unexposed areas in the material. A basic schematic of one popular incarnation of this concept is shown in Figure 14, which shows the use of photochemically generated acid to cause a catalytic series of reactions in a... 

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