Mixture and compound Essay Example | Topics and Well Written Essays - 750 words

Mixture and compound - Essay Example A compound comprises of a fixed ratio, for example, in water, there are two hydrogen molecules for every oxygen molecule. In mixtures, the ratios of the individual elements vary, depending on the use of the mixture. A mixture is also only composed of the constituent element, and the properties of the mixture are those of the individual elements (Phillips, 1998). A compound on the other hand, is a new substance with new chemical properties, e.g. common salt, a white compound, does not bear any resemblance to sodium, a grey metal, or chlorine, a greenish-yellow gas (Phillips, 1998). To distinguish a mixture from a compound, use their chemical properties (Patten, 1995). A mixture retains the properties of the individual substance that are part of its composition. For example, air is a mixture of gasses and is has properties of all the gasses, e.g. it supports burning, a chemical property of oxygen gas as other elements in the air do not support burning (Patten, 1995). Compounds have an all together different set of chemical properties from those of the constituent elements (Phillips, 1998). It is not possible to tell the chemical composition of a compound without a chemical test, unlike a mixture. Therefore, changes in color, chemical properties and physical properties are the distinguishing factors between compounds and mixtures (Phillips, 1998). When elements combine to form compounds, different types of bonds hold their atoms together (a bond is the energy that hold the atoms in a compound together), covalent, ionic, dative and metallic bonds (Pettifor, 1995). Covalent bonds exist between two non-metallic elements such as oxygen and carbon. When carbon burns in the air, a chemical reaction occurs, leading to the formation of carbon dioxide. Due the bond between these two elements is a dative bond (a special form of the covalent bond). A chemical reaction between two non-metals leads to the formation of a covalent bond (Pettifor, 1995). Due to an almost full out er energy level, non-metals do not lose electrons in a reaction; instead, they share the electrons in the outermost rings to form octets in the case of oxygen and carbon (Sebera, 1964). When a metal reacts with a non-metal, the metal donates the electrons in its outermost shell to the non-metal. That way, both atoms have complete shells in their outermost energy levels. In ionic bonding, the metal acquires a positive charge due to more protons than electrons in an atom while the non-metallic atom acquires a negative charge. These two opposite charges attract, holding the compound strongly together. While the covalent bond is strong between the atoms involved, the resultant structure I held by weak Van der Waals forces of attraction, which explains why ionic compounds lean to have a higher melting point than covalent compounds (Sebera, 1964). To achieve stability, elements need their outermost energy levels filled with electrons (Pettifor, 1995). For metals, their outermost energy le vels are comprised of a maximum of three electrons e.g. in aluminum. Elements with four electrons are non-metals , but some of them such as silicon and carbon have metallic properties, e.g. graphite, an allotrope of carbon conducts electricity, a property of metals (Sebera, 1964). In chemical reactions, it is easier to dislodge the few electrons in the outer shell than to gain electrons needed to fill the outermost

The strength of the economy of China and the future of the economy Dissertation

The strength of the economy of China and the future of the economy - Dissertation Example This essay discusses that economic development of a country measured by certain factors related to economics. The factors are the gross domestic product of the country, which relates to the standard of leaving of the people of the country. For developing a country, the government has to take certain measures. For making a sustainable development, the government has to assure that the financial base of the country is good. For making the financial base robust, the government has to use the sources available to them efficiently and should do sector wise development. In the era of globalization, when the economies of the countries connected with each other, the problem in one country can create problem to the whole world. In the year 2007, the economy of the United States has come under trouble. The reason behind the financial depression was that a large number of people got default, as they were unable to pay their housing loans. The bad debt amount of the bank increases at a level tha t the banks had to declare themselves default. The banks like Lehman Brothers bankrupted. As a result, the economy of the United States tumbled. As the economy of the country was down, the stock market indices also came down at that point of time. As an effect of the incident, the economy of all the countries get into problem as this is an era of globalization. The United States is the biggest economy of the world. When the largest economy of the world was under problem, all the economies get under trouble. The countries, which had trade relations with that country, came under a direct problem. This incident threw questions on the base of the United States economy. If the base of the economy was good, then they could avoid this kind of situation. This paper will research about the strength of the economy of China and the future of the economy. The researcher will analyze whether the economy is strong, or the base of this is as weak as the United States. Problem Statement Economy of China: The Cause of the Development and the Future of the Economy. Aims and Objectives The aim of the research is to analyze the economical condition of China, the developments made by the Chinese government, which made the country one of the most developed countries in the world. The researcher will also analyze that whether the future of the economy is also strong. To make the economy strong, the government has to make certain policies so that the base of the economy becomes strong. The base of the economy means the per capita income of the fellow citizens, the average educational qualification of the people of the country, the purchasing power parity of the persons. If the base of the country is strong, then the resources available to the companies in the country will be good. If the company can utilize the available resources efficiently, then the production will be at its best. If the company managed efficiently by the professionals, then the profit will also be good. The development of a country depends on the performance of the companies also. If the industrial production of the country is good and the number of export-oriented company is a lot, then the country will earn foreign currencies more. The objective of the project is to analyze the robustness of Chinese economy. The researcher will find about the policies of the Chinese government. It is to analyze that whether the policies of the government are favourable for the companies to do business in the country and whether the policy motivates the companies to export to other countries. The researcher will also an alyze the sources available to the companies i.e. the labours, raw materials etc. The qualities of the labours will also analyze by the researcher i.e. their competencies, educational qualifications. The purchasing power

Teachers' stages of concern Research Paper Example | Topics and Well Written Essays - 2500 words

Teachers' stages of concern - Research Paper Example Globalization compels all countries to undertake substantial changes in their education agenda to be able to cope with such changes. Among these is the need to cope with technology. The demands placed upon the workforce, in terms of technology competencies, have made nations conscious of the need to integrate technology into school curricula, to prepare the youth for the demands of the future (Hord, Rutherford, Huling-Austin, & Hall, 1987; Hishamuddin, 2005). Tinio (2003) succinctly puts that the justification for the promotion of ICT in curricula worldwide is to equip students for the future requirements of the work setting. The latter strongly required the use of ICT, specifically computers and other online resources. This makes computer literacy a requisite for success in a technology-driven world (Tinio, 2003). The move to integrate technology into education entails the use of technological tools in pedagogy, including the Internet, blogs, digital cameras, other electronic and di gital tools to enhance the teaching process. Moreover, Pierson (2001) notes that educational reform will only be authentic if it goes beyond the acquisition of hardware supportive of technology, but a real, open adoption of strategies that will enable such integration into the school curriculum. Pierson (2001) adds that the requirement for computer literacy is apparent in daily tasks required of students both in their homes and within the educational institution. This demand entails teachers to gain knowhow of content, instruction, and technology that are apt for student progress. It is thus critical for teachers to know how to integrate technology into their teaching approaches (Pierson, 2001). The differences between the conventional and novel uses of technology emphasize the idea that teachers can utilize technology to enhance pedagogical approaches towards the enhancement of student learning (Cognition and Technology Group at

What are the main features of British conservatism Essay

What are the main features of British conservatism - Essay Example British conservatism takes its roots in philosophical ideas and concepts of Edmund Burke. British conservatism has a great impart on other world countries and their economic, political and cultural life. The British conservatism reflects the interests of rural land owning class and protects the Monarchy. The main values of British conservatives are the Angelical Church, family and property. Thus, during 1980s there has been a great shift towards free-market and liberal economic policies.Edmund Burke is transformed from a Whig into the crowning embodiment of everything that is valuable in conservative thought. Nineteenth-century conservatives, discouraged by the young Burke's support of causes such as Catholic emancipation, looked elsewhere for their ideological antecedents. There were, moreover, other writers (John Reeves, for instance) who elaborated a genuine Tory response to the ideas associated with the French Revolution. Burke has become the principal occupant of the Tory (Viere ck, 2005). Conservatives have long believed that the operation of this 'second nature' serves to protect a minority from many of the frailties which commonly afflict people (Viereck, 2005). The argument, which took root in the relatively fixed hierarchy of a predominantly agrarian society, is that those born into a elite can, in an unusual degree, acquire knowledge and wisdom, cultivate taste and virtue, and engage in civilized conversation, as well as being imbued from an early age with the responsibilities of public service. They are therefore less likely to be corrupted by power than those untrained in its exercise (Viereck, 2005). British conservatives espouse certain virtues or characteristics: prudence, justice, wisdom, moderation, self-discipline, frugality, industry, piety, honesty, obedience to and respect for authority, duty. Two other important aspects of conservatism are its anti-speculative, anti-theoretical stance and its espousal of some form of aristocracy. Political and social theory is even a sign of an ill-conducted state (Viereck, 2005). The conservative, then, tends to mistrust theoretical answers to problems, preferring the test of time and history. The conservative tends also to mistrust intellectuals, especially liberal and radical ones. Conservatism is a set of political, economic, religious, educational, and other social beliefs characterized by emphasis on the status quo and social stability, religion and morality, liberty and freedom, the natural inequality of men, the uncertainty of progress, and the weakness of human reason" (Viereck 2005, p. 76). For British conservatives, more important is the conservative's position on liberty and equality. Liberty is insisted upon; equality, however, does not exist nor can it exist. As Burke (1955) said, with his customary eloquence, levelers, acting for equality, change and pervert the natural order of things: "In this you think you are combating prejudice, but you are at war with nature" (Burke 1955, p. 56 cited Stanlis 2000, p. 82). This is perhaps the single most significant difference between the conservative and the modern liberal and the socialist. Modern conservatives strongly and positively prize freedom, as do liberals, and they acquiesce to policies and programs of equality because it is necessary or politically expedient to do so. if they bow at all, to what they see as a powerful contemporary force. It may even be said that modern liberals actively espouse equality, whereas modern conservatives actively espouse freedom and liberty and leave equality to liberals (Gamble, 1995). Less remarkable are the ideas of the modern right, for they have long been the stock-in-trade of free-market Conservatives. Those who now favour an enterprise culture share with earlier individualists a fear of creeping socialism, a conviction that the poor benefit from the wealth created by the rich, a belief that welfare coddling erodes self-reliance and places unfair burdens on the more competent members of

Teachers' stages of concern Research Paper Example | Topics and Well Written Essays - 2500 words

Teachers' stages of concern - Research Paper Example Globalization compels all countries to undertake substantial changes in their education agenda to be able to cope with such changes. Among these is the need to cope with technology. The demands placed upon the workforce, in terms of technology competencies, have made nations conscious of the need to integrate technology into school curricula, to prepare the youth for the demands of the future (Hord, Rutherford, Huling-Austin, & Hall, 1987; Hishamuddin, 2005). Tinio (2003) succinctly puts that the justification for the promotion of ICT in curricula worldwide is to equip students for the future requirements of the work setting. The latter strongly required the use of ICT, specifically computers and other online resources. This makes computer literacy a requisite for success in a technology-driven world (Tinio, 2003). The move to integrate technology into education entails the use of technological tools in pedagogy, including the Internet, blogs, digital cameras, other electronic and di gital tools to enhance the teaching process. Moreover, Pierson (2001) notes that educational reform will only be authentic if it goes beyond the acquisition of hardware supportive of technology, but a real, open adoption of strategies that will enable such integration into the school curriculum. Pierson (2001) adds that the requirement for computer literacy is apparent in daily tasks required of students both in their homes and within the educational institution. This demand entails teachers to gain knowhow of content, instruction, and technology that are apt for student progress. It is thus critical for teachers to know how to integrate technology into their teaching approaches (Pierson, 2001). The differences between the conventional and novel uses of technology emphasize the idea that teachers can utilize technology to enhance pedagogical approaches towards the enhancement of student learning (Cognition and Technology Group at

International politics, Movie Analysis Review Example | Topics and Well Written Essays - 500 words

International politics, Analysis - Movie Review Example They should have known that for monistic states, the international law that protects humanity is directly translated and incorporated into the national law and should be applicable (Bradley 1). Moreover, the truth is that the judges should have known better and understood international law since they were already educated adults by the time Hitler was rising into power (Bradley 1). These judges during the Hitler’s regime were bounded by the love for their country. This is shown in the movie when Hitler announced that all Jews would be destroyed, they as judges who knew the law also stood down (Bradley 1). The truth of the fact is that the outcome of this military tribunal was very important. It was a test case to show that national and international law against humanity is powerful and applicable to anyone. It will send a strong message to all government officials whose work is to enforce the law to do so with international law appealing before making final verdict against the accused (Bradley 1). There was need to value for human life as a judge (Bradley 1). According to the movie, the judges had sentenced 99 people to life imprisonment and there was not a single one who was serving the trial. This calls for the pardon granted to them by the military tribunal that had been formed to explore the crimes committed against humanity during the Hitler regime. The military tribunal was specifically formed to try top war criminals, political and military leaders of the third Reich (Bradley 1). The tribunal operated under the Control Council Law No.10 at the US Nuremberg Military tribunals (Bradley 1). In summary at the end of the movie, judge Janning confessed after being found guilty that as Judges of the time they had no idea that mass execution would erupt as a result of their ruling (Bradley 1). He also confessed to have realized for the

Fluent Melting and Solidification Essay Example for Free

Fluent Melting and Solidification Essay 8.1 Overview of Phase Change Modeling in FLUENT FLUENT can be used to solve uid ow problems involving phase change taking place at one temperature e.g., in pure metals or over a range of temperature e.g., in binary alloys. Instead of explicitly tracking the liquid-solid front as the phase change occurs, which requires a moving mesh methodology, an enthalpy-porosity formulation is used where the ow and enthalpy equations are solved with extra source terms on the xed grid. Marangoni shear, due to the variation of surface tension with temperature, is important in many industrial uid ow situations involving phase change. The phase change model in FLUENT provides the ability to specify the Marangoni gradient at a sloping surface, as well as an arbitrary shear at a boundary coinciding with one of the curvilinear grid lines. The model also allows you to specify the convective heat transfer, radiation, and heat ux at a wall as piecewise linear pro les, polynomials, or harmonic functions. FLUENT provides the following phase change modeling options: Calculation of liquid-solid phase change in pure metals as well as in binary alloys. Modeling of continuous casting processes i.e., pulling of solid material out of the domain. Chapter 8 | Phase Change Simulations Ability to specify an arbitrary shear at a curved boundary as a piecewise linear pro le or polynomial in terms of one of the Cartesian coordinates. Modeling of Marangoni convection due to the variation of surface tension with temperature. Modeling of the thermal contact resistance between frozen material and the wall e.g., due to an air gap. Ability to patch a momentum source in each Cartesian direction and or a heat source to simulate magnetic force elds or heat generation in the domain, for example. Display and patching of latent heat content, pull velocities in continuous casting and other relevant variables. These modeling capabilities allow FLUENT to simulate a wide range of phase change problems including melting, solidi cation, crystal growth and continuous casting. The physical equations used for these phase change calculations are described in the following sections. Limitations of the As mentioned above, the phase change formulation in FLUENT Phase Change can be used to model the melting freezing of pure materials, as Model well as alloys. The liquid fraction versus temperature relationship used in FLUENT is the lever rule|i.e., a linear relationship Equation 8.2-3. Other relationships are possible 124 , but not available in FLUENT. The following FLUENT features cannot be used in conjunction with the phase change model: Radiation Combustion Speci ed periodic mass ow Cylindrical velocities Overview of Phase In order for you to enable the phase change model, the energy equaChange Modeling tion must be active. You are then required to supply additional Procedures physical constants pertaining to the phase change problem liquidus and solidus temperature, latent heat of freezing, etc.. You may invoke one of the enhanced boundary conditions that are available c Fluent Inc. May 10, 1997