Abstract This paper presents and examines an experiment that identifies two unknown compounds based on their solubility, reactions with various organic and inorganic molecules and the melting point of certain synthesized derivatives containing the unknown. It describes the methods of the experiment and then presents and discusses the results obtained.
Table of Contents:
Introduction
Materials and Methods
Results
Discussion
From the Paper "The final step in the identification process was to make an acetamide derivative and its melting point to discover the primary amine (Organic Chemistry Lab Manual, 48-65). However, the recrystallization process did not yield any crystals, so the melting point of the actual unknown was measured. At 108-110oC, it would indicate 3-nitroaniline, which has a melting point of 113oC in literature (ChemIDplus Advanced). In addition, it does have a high molecular weight, 138.14 g/mol (ChemIDplus Advanced), as the solubility of its sulfonamide salt indicated (Organic Chemistry Lab Manual, 48-65). Finally, it is the only primary amine that is a yellow crystalline solid at room temperature (International Programme on Chemical Safety)."
Tags: solubility reaction, melting point, derivative
Abstract In this article, the writer discusses the background, career and scientific contributions of Friedrich August Kekule. The writer looks at this scientist, who put forward the theory of tetravelence for carbon and determined the structure of benzene. The writer explains the importance of Kekule's theories as these two scientific contributions are those upon which organic chemistry is based.
From the Paper "Friedrich August Kekule was born in Damstadt, Germany and attended the Gymnasium in his home town excelling at languages and drawing. He went on the University of Giessen planning to study architecture but after attending a lecture by Liebig of condenser fame, Kekule became fascinated with chemistry. He spent a year at home pondering a decision and decided to pursue an education in chemistry. Kekule studied in Paris under Dumas substitution theory and Gerhardt type theory then returned to Giessen to ... "
Abstract This paper describes chemical warfare in insects. The paper begins by offering a definition of the chemistry of vision. Next the paper discusses the role of polycyclic aromatic hydrocarbons in cancer. Then the paper explains the effect of chlorfluorocarbons on the ozone layer, nature, chemistry and sources of petroleum.
Tags: chemical warfare among insects, chemistry of vision, polycylic aromatic hydrocarbons and cancer, chlorofluorocarbons and the ozone hole, petroleum
Abstract This paper examines the process of extracting essential oils from plants, in particular, Neroli. The author explains the key concerns in this process, the characteristics of the oil and the characteristics of the plant. Noting that citrus plants produce three different oils in different parts of the plant, the author cautions that different methods need to be used to produce the different oils. The paper explains the uses of Neroli and comments on the cost and economic factors governing the price of this essential oil extracted from the bitter orange tree.
Outline:
Characteristics of the Plant
Citrus Oil Production
Citrus Chemistry
References
From the Paper "Labor is the most costly aspect of Neroli and Orange Blossom Water. However, the market for the products is high and continues to grow, especially as a gourmet food additive. As McMahon points out, there is justification for the argument that higher priced oils are superior in this case, due to shortcuts taken by producers in low priced years. Steam distillation is the preferred method and produces the highest quantity and quality of oils. The hydrosol and oil keep best under refrigeration, as the oils remain volatile in their distilled state."
A paper analyzing the physical and chemical properties of the lead (II) and lead (IV) halide compounds. Comparisons between compounds and applications are also discussed.
Abstract After a brief historical introduction to lead compounds, it explains what +2 and +4 cations are and examines their uses. The physical and chemical properties of the lead (II) halides are also discussed, with mention of "mixed" halides (e.g., PbFCl).
Outline
An Introduction to Lead
General Lead Dihalide Trends
Mixed Lead Halides
Lead Chloride
Lead Bromide
Lead Iodide
Lead Fluoride
Lead Tetrahalides
Lead Tetrafluoride
Lead Tetrachloride
Possible Lead Halide Application
From the Paper "Lead, located at the bottom of group IVA on the periodic table is well known for being a massive (atomic mass is 207.2 amu) and dense element. The density characteristics associated with lead arise from its rather compact structure despite its large size. This occurs in accordance to the periodic trend that atom size decreases as one moves left to right across a period. This trend, in conjunction with the massive properties found among the period six elements, accounts for the elements ranging from osmium to lead in that row being the densest (osmium does have the largest density) known to exist."
Abstract This paper considers the potential for co-evolutionary interactions between plant secondary compounds and browsing mammals in a relatively simple system. It first briefly presents several theoretical ideas on plant-animal co-evolution and then present the evidence on interactions between mammalian browsers and woody plants in boreal regions that may bear on the co-evolutionary questions.
Paper Outline:
Introduction
Theoretical Co-evolution
Browsers and Food Plants in the Boreal Forest
Variation in Secondary Compounds and Browsing Resistance
Estimating Plant Fitness
The Herbivores: Hares, Moose, and Voles
Conclusion
From the Paper "The evidence for the effects of secondary compounds on fitness has not been measured directly for boreal mammals. However, the evidence presented above suggests that they may be important. Both the fine-scale selectivity of browsers among similar plants and plant parts that vary in their levels of secondary compounds (Bryant et al. 1991a,b, Bryant et al. 1992) and the potentially severe effects of these chemicals on the herbivores' nutritional status (Iason and Palo 1991) suggest that the ability to avoid or detoxify secondary compounds is a result of selection."
Abstract The paper explains the principle of time value of money (TVM) that illustrates how money can grow by earning interest over time. This growth is made possible through various investment instruments, such as banks, stock market, annuities and insurance. The paper addresses the impact of the following items on TVM: interest rates and compounding, the present value (of a future payment received), the future value (of an investment), opportunity cost and annuities and the rule of 72.
Outline:
Interest Rates and Compounding Present Value (of a future payment received)
Future Value (of an investment)
Opportunity Cost
Annuities and the Rule of 72
From the Paper "The growth of money is directly proportional to its amount. A small amount will earn only small interest, while larger amounts will earn larger interests. The Interest Rate is the percentage of growth for a given year. Money growth through interest is made possible by investments. Banks, for example, accepts money from its clients through deposits. It then uses this money as loan to other people and make a profit through the transaction. Because of this, the bank also has to pay some compensation to the original depositor, and this is the interest. Simply defined, interest is the cost of borrowing money. There are two types of interest: Simple and Compound."
Abstract The paper explains the time value of money (TVM) principle, which illustrates how money can grow by earning interest over time through various investment instruments such as banks, the stock market, annuities, and insurance. The paper examines interest rates and compounding, the present value (of a future payment received), the future value (of an investment) opportunity cost and annuities and the Rule of '72. The paper identifies the impact of these factors on TVM.
Outline:
Interest Rates and Compounding Present Value (of a Future Payment Received)
Future Value (of an Investment)
Opportunity Cost
Annuities and the Rule of '72
From the Paper "The growth of money is directly proportional to its amount. A small amount will earn only small interest, while larger amounts will earn larger interests. The Interest Rate is the percentage of growth for a given year. Money growth through interest is made possible by investments. Banks, for example, accepts money from its clients through deposits. It then uses this money as loan to other people and make a profit through the transaction. Because of this, the bank also has to pay some compensation to the original depositor, and this is the interest. Simply defined, interest is the cost of borrowing money. There are two types of interest: Simple and Compound."
A look at how the creation of credit in the U.S. economy has been hugely compounded over time and why credit is the defining aspect of our financial system.
1,105 words (approx. 4.4 pages), 4 sources, 2001, $ 38.95
Abstract This paper explores the aspect of credit in America's financial system and traces the path of credit from its origins. The author examines how the creation of credit in America's economy has been greatly compounded over time and, now hugely prevalent, credit is the defining aspect of the national financial system.
From the Paper "Today credit is more prevalent then ever before. Over three quarters of the American adult population have and use at least one credit card. However, along with this heavy reliance on credit comes a definite risk. Even as early as 1791 this threat was realized, the bank made a large impression on the economy within months of opening its doors in late 1791. Initially it flooded the market with its notes and credits, and then, in February 1792, it sharply reversed course and curtailed credit."
Abstract This paper describes the need and benefits of calcium in our lives and discusses the detrimental or negative effects of overusing calcium resources.
From the Paper "It is obvious, the impact that calcium compounds have on our world today. It goes without saying that our lives would be very different without them. They are an essential mineral to maintain health, and an important component of many things that we need to make our lives better.
However, all of this convenience is not without cost."
Abstract he paper is written in the form of a laboratory report. The purpose of the experiment was to use an empirical formula in order to find a compound which has been created inside a crucible. The paper shows the procedure in which the experiment was done as well as its outcome. Flow charts, tabulated results and mathematical calculations are also included in the paper.
From the Paper "The importance of safety precautions is extremely important in trying to maintain a safe and healthful research environment. When working with all extremely hot metals with your hands, gloves should be worn at all times. The temperatures of these metals or "hot objects" absorb heat and could cause damage to the skin if touched. Without the use of gloves, hands can be severely burnt. One mistake or foolish act could cause much pain and suffering to students in the laboratory. People who do not handle hot objects carefully can get their nerves burnt off on their finger tips and could possibly never feel again. It is not worth taking a risk of not using gloves when applicable. Everyone wants to be safe in the laboratory so it is important to be aware and cautious. A safe laboratory is a safe life."
Tags: composition, data, error, knowledge, molar, percent, physics, ratio
Abstract The paper begins with a general overview of air pollutants and the discovery of "sick building" syndrome. Next the paper focuses the pollutants known as on MVOC's - microbial volatile organic compounds, studying their impact on human beings. It looks at the effects of molds on human health; namely, allergy, infection, irritation of the mucous membrane and sensory, or toxicity. It looks at the products of mold called mycotoxins, and their influence on health. The paper then turns to discuss analysis techniques, listing eight reasons why sampling is difficult. It also records criteria for ensuring the reliable measuring of indoor air VOC?s. The third section of the paper deals with the growth and metabolism of indoor fungi and bacteria, focusing on the breeding and multiplying of molds. The paper concludes with a discussion on what can be done to minimize the problem and on the processes involved in treating a "sick building".
Table of Contents
Introduction
MVOCs as Indoor Pollutants and Their Impact on Human Beings
Analysis Techniques
Growth and Metabolism
Conclusion: What Can Be Done
From the Paper "Air pollution pertains to substances and gases in the air that threaten health and life. Among these are pollutants and irritants, such as nitrogen oxides, sulfur dioxide, and carbon dioxide; particulates, volatile organic compounds (VOCs), toxic substances and some natural substances, like pollen. But most of the pollution comes from the by-products of industrialization ? fossil fuel combustion, transportation, transportation, power plant emissions and those from other industrial processes. The burning of fossil fuels to generate electricity alone is the greatest source of air pollution in the USA. These outdoor pollutants can undermine health and cause environmental disturbances, such as acid rain, and are toxic."
Abstract Examines several issues related to the history of simple & compound interest rates. Centers on loans, credit. Defines terms. Overview of history of interest rates; fluctations; government economic policy decisions; supply & demand for money. Summary of averages of prime short-term rates (19th & 20th Centuries). Suggests that interest rates are tied to non-economic as well as economic factors.
From the Paper "Introduction
Sidney Homer (1963), in his seminal history of interest rates, argues that such a history of often dramatic interest rate fluctuations provides an excellent summary of the success of some communities and the failures of others to develop effective commercial ethics and laws and suitable monetary and fiscal techniques and policies. While "credit" is considered a modern device (or vice), a brief survey of financial history will demonstrate that credit was in general use in ancient and in medieval times, antedating industry, banking and even coinage. It is the purpose of this brief report to examine selected issues related to the history of simple and compound interest rates, specifically on loans, and to consider periods when high rates were commonplace in their historical context."
Abstract This study examines the role ferrocene plays in the chemistry curriculum beginning with introductory chemistry through advanced studies in chemistry. The findings of the study indicate that ferrocene, when introduced in the basic concepts of chemistry and then continued as example and practice in analytical and advanced investigations, facilitates an overall understanding of chemical concepts while maximizing exposure to general, analytical, inorganic and organometallic concepts. Ferrocene becomes in essence a "one stop shop" for understanding.
Introduction
Statement of the Problem
Purpose of Study
Importance of Study
Rationale of Study
Overview of Study
Review of Related Literature
Methodology
Description of the Study Approach
Data Analysis
Summary, Conclusions and Recommendations
From the Paper "Consistency in learning methods is essential to cognitive retention. The utilization of similar compounds as example, practice and teaching aids can facilitate better understanding of material through familiar experiences while at the same time enhancing the teaching experience. The defacto method of chemical education is to utilize classic textbook teaching of building on foundation concepts throughout the curriculum. While this methodolgy works well, it can be improved. Selecting one or more compounds to use as a foundation, "keystone" compound, would benefit both student and teacher. Currently in literature, there are copious examples throughout the college career that equates to confusion. By defining compounds that embody general chemistry, organic, inorganic, physical and analytical properities throughout the levels of chemical education, students understanding would greatly improve. The universities would also benefit due to the consistency expected at each level. Identifying such compounds would also lend itself to saving funds by limiting the compounds students are exposed to."
Abstract This paper discusses an experiment that introduced several methods of differentiating between several types of organic compounds containing oxygen in their functional groups. Specifically, the experiment compares alcohols, ethers, aldehydes and ketones. The paper presents the results in a table and discusses them. Several figures are also presented.
Table of Contents:
Introduction
Materials and Methods
Results
Discussion
From the Paper "In this test, the rate of reaction is dependant upon the degree of substitution. This is because the Lucas reagent creates conditions that favour the SN1 mechanism, and therefore, the most substituted carbocation intermediate will react the fastest. Therefore, when the alcohol group is on a tri-substituted carbon, like in 3-methyl-1-buten-3-ol and 2-methyl-2-butanol, the reaction will be the fastest. In addition, 3-methyl-1-buten-3-ol contains a double bond, which enables resonance stabilization of the carbocation intermediate. 2-methyl-2-butanol lacks this feature, and is therefore, slightly slower. Since the alcohol group is on a di-substituted carbon in 3-methyl-2-butanol, the reaction will be even slower. 3-methyl-1-butanol will not even react since its alcohol group is on a mono-substituted carbon."
