Chemistry class xii project Essay Example for Free

Chemistry class xii project Essay Theory What is rust? Rust is the common name of a compound, iron oxide. Iron oxide, the chemical Effie, is common because iron combines very readily with oxygen so readily, in fact, that pure Iron Is only rarely found In nature. Iron (or steel) rusting Is an example of corrosion an electrochemical process involving an anode (a piece of metal that readily gives up electrons), an electrolyte (a liquid that helps electrons move) and a cathode (a piece of metal that readily accepts electrons). Causes When a piece of metal corrodes, the electrolyte helps provide oxygen to the anode. As oxygen combines with the metal, electrons are liberated. When they flow through the electrolyte to the cathode, the metal of the anode disappears, swept away by the electrical flow or converted into metal actions in a form such as rust. For iron to become Iron oxide, three things are required: Iron, water and oxygen. Here’s what happens when the three get together: When a drop of water hits an Iron object, two things begin to happen almost immediately. First, the water, a good electrolyte, combines with carbon dioxide in the air to form a weak carbonic acid, an even better electrolyte. As the acid is formed and the iron dissolved, some of the water will begin o break down Into Its component pieces hydrogen and oxygen. The free oxygen and dissolved iron bond into iron oxide, in the process freeing electrons. The electrons liberated from the anode portion of the iron flow to the cathode, which may be a piece of a metal less electrically reactive than iron, or another point on the piece of Iron Itself, Consequences Rusting has a number of effects on metal objects. It makes them look orange and rough. It makes them weaker, by replacing the strong Iron or steel with flaky powder. Some oxides on some metals such as aluminum form Just a thin layer on top which lows down further corrosion, but rust can slowly eat away at even the biggest piece of iron. If a piece of Iron’s strength Is important for safety, such as a bridge support or a car’s brake caliper. It Is a good Idea to Inspect It for rust damage every now and then. Rust also can cause metal parts that are supposed to slide over one another to become stuck. Rust can make holes In sheet metal. Rusty car mufflers sometimes develop holes in them, and the sheet steel making the outer bodies of cars will often rust through, making holes. Rust Is a lot less magnetic than Iron. An iron magnet will probably still work almost as ell when It has a thin coating of rust on It, but If It has rusted so badly that most of the metal is gone, then it will not work very well as a magnet. 1 OFF which is a metallic conductor. So if some electrical connection is made with iron, it’s likely to go bad when the iron surface rusts. Rust is associated with degradation of iron-based tools and structures. As rust has a much higher volume than the originating mass of iron, its build-up can also cause failure by forcing apart adjacent parts ? a phenomenon sometimes known as â€Å"rust packing†. It was the cause of the collapse of the Missus river bridge in 1983, when he bearings rusted internally and pushed one corner of the road slab off its support. Rust was also an important factor in the Silver Bridge disaster of 1967 in West Virginia, when a steel suspension bridge collapsed in less than a minute, killing 46 drivers and passengers on the bridge at the time. Prevention and Protection Because of the widespread use and importance of iron and steel products, the prevention or slowing of rust is the basis of major economic activities in a number of specialized technologies. A brief overview of methods is presented here; for detailed overage, see the cross-referenced articles. Rust is permeable to air and water, therefore the interior metallic iron beneath a rust layer continues to corrode. Rust prevention thus requires coatings that preclude rust formation. Some methods of prevention of rusting are as follows: Gallivanting:- Globalization consists of an application on the object to be protected of a layer of metallic zinc by either hot-dip gallivanting or electroplating. Zinc is traditionally used because it is cheap, adheres well to steel, and provides catholic protection to the steel surface in case of damage of the zinc layer. In more corrosive environments (such as salt water), cadmium plating is preferred. Coating and Painting:- Rust formation can be controlled with coatings, such as paint, lacquer, or varnish that isolate the iron from the environment. Large structures with enclosed box sections, such as ships and modern automobiles, often have a wax-based product (technically a â€Å"slashing oil†) injected into these sections. Such treatments usually also contain rust inhibitors. Covering steel with concrete can provide some protection to steel because of the alkaline pH environment at the steel-concrete interface. Humidity Control:- Rust can be avoided by controlling the moisture in the atmosphere. An example of this is the use of silica gel packets to control humidity in equipment shipped by sea. Metal Coupling:-Len this method, the iron is coupled with other metal and if the metal is above iron in electrochemical series(meaner more electrostatics)then in the galvanic cell is formed by the contact of the iron and that metal, iron will go under reduction it will be safe from rusting. If the metal is below iron in electrochemical series then iron will go under oxidation and rusting will be facilitated. Chemistry class xii project. (2018, Oct 12).

BU6603 ITM_Assignment_Aug-Nov_2014_2 Essay Example | Topics and Well Written Essays - 2000 words

BU6603 ITM_Assignment_Aug-Nov_2014_2 - Essay Example In the following sections, brief history of Apple and gradual growth of the company through technological innovation have been discussed along with role of Steve Jobs therein. Apple is a multinational corporation which was founded in 1976 by Steve Jobs, Steve Wozniak and Ronald Wayne. However, Wayne left within some period while Jobs and Wozniak continued in the business. The vision of Jobs and Wozniak was to develop a user friendly computer device and change consumers’ perception regarding computer. Wozniak developed first computer of Apple, Apple I which however did not gain much recognition. Wozniak and Jobs introduced Apple II in 1978, which was a revolutionary move as they developed colour graphics for the first time. Sale of the device grew from $7.8 million in 1978 to $117 million in 1980. Apple raised its first IPO (Initial Public Offerings) in 1980 and started trading as a public company (Mac World, 2014). In 1983, Wozniak left the company due to diminishing interest in Apple’s daily operations. In 1984, Apple developed the Macintosh which was a huge success in the consumer market. After this brief success, power struggle among executive members of the organisation resulted in departure of Steve Jobs. Absence of guidance from prominent leaders resulted in declining market share and financial problems in the firm. Steve Jobs returned as interim CEO in 1997 after Apple purchased his company, neXT. During late 1990s, expert suggested that Apple should shutdown and pay off its shareholders, but Jobs brought in turning point of the company by inducing the iMac. Following iMac, iPod was introduced in 2001 while iPhone was unveiled in 2007. In 2008, Wal-Mart’s online music store faced stiff competition from iTunes store. In 2010, the technological innovation at Apple moved a step ahead with entry of iPad (Terrell, 2008; Mac World, 2014). In 2011, death of Steve Jobs left Apple seeking direction and leadership. The

Differentiate between the humanities and other modes of human and Essay

Differentiate between the humanities and other modes of human and expression - Essay Example The paper will focus on defining the term humanities, distinguish it from the modes of human inquiry and expression and explain the way Art, Music, Architecture, Philosophy, and Literature are reflecting the current development in politics, socioeconomics and technology. Science is entirely separated and segregated into two classes, which include Social science and natural science, but humanities are separate from present day science since it associates with non-scientific approaches in human mode of inquiry (Lyn, 1997). Therefore, humanities are not focused on establishing validated theories and scientific laws; instead, humanities focus on interpretation of the historic and cultural context of art. It also explores the analysis of written text and validation through a comparison with other sources, which relate to presented material from other disciplines such as philosophy, history and sociology. On the other hand, Art, Music, Architecture, Philosophy and Literature have depicted the contemporary development in politics, socioeconomics and technology, for instance, Art has been applied in the process of expressing the social and economic factors. In fact, an exemplary example, relates to a famous artist, Donatello, who made humanistic expressions during the Medieval Times and his sculptures were admired, since he produced marble, bronze and wood. His work was in Gothic style, and this evolved into naturalism, which is known from the classical antiquity. In relation to this, the artists in the present day are using paintings and sculptures to display expressions of human enquiry, in fact, there are different kinds of art that are being enjoyed by people in different museums in the worldwide. Music has been used for worshiping, as a technique of worshiping in religion, and as a way of sending messages. In fact, during the slavery period, the lyrics of slave songs were used to express the need for freedom, and relaying messages to the other slaves. For example, slaves would use music to plan an escape, whereby the hymns offered substantial information like the meeting venue and departure time. Technology has been reflected through Architecture, where there are modern designs being developed through technology. For example, the architects are now using software such as Auto card to make designs. On the other hand, technology is enabling the exploration of arts into distinct past, through deployment of various pieces of art galleries, hence inhabiting them on the web pages; thus, art is being incorporated in art studio around the world, hence offering competition to the museums. Music also has also been integrated with technology leading to a decrease in the use of traditional instruments like trombone, flute and an organ, which were used for composing. In fact, the artists and producers are experiencing challenges of privacy since music can now be easily downloaded without charges from the internet. Literature has also depicted an element of philosophy, whereby different books has been written by various authors aiming to extend knowledge regarding a theory, and his has become vital sources of knowledge. For example, different scholars in the present world are use literature to review ideas from different books in order to provide evidence to support their notions. On the other hand, literature has been integrated w

Ramsey MacDonald owns a small hotel on the outskirts of Nottingley and Essay

Ramsey MacDonald owns a small hotel on the outskirts of Nottingley and employs Atif as the resident manager. Atif works hard at his job but can be very disorgan - Essay Example On the day of the visit, Atif put in an extra special effort and ensured that everything was well organised. Ramsey’s friends duly helped out in the restaurant as requested. The representative from the hotel guide was very pleased and gave the hotel an excellent review. Ramsey was delighted and promised to pay  £50 to each of his friends who had helped out. Atif has recently been using all of his free time to redecorate his bedroom in the hotel at his own expense. Ramsey was so impressed with the finished bedroom that he has promised to pay Atif  £100 to cover the cost of the materials used. However, Ramsey has now received a very good offer for the hotel and so has decided to sell it. He is therefore now refusing to pay the  £500 bonus promised to Atif or any of the money which he promised to pay to his friends. Ramsey is also denying any obligation to pay Atif the  £100 which he promised him in respect of the redecoration of the bedroom. The town council, concerned about the future of the hotel under a new owner, has also now refused to pay Atif the promised  £300 bonus. According to Garner (2004), â€Å"A contract is an agreement between two or more parties creating obligations that are enforceable or otherwise recognizable at law,† (p. 341). As explained by Marsh and Soulsby (1987), in order for the court to intervene and make any person liable for damages in case one of the parties breaks the agreement, the said agreement must have the following important features: parties must have the intention to create legal relations; there must be a firm agreement between the parties showing the unconditional acceptance of an offer; a consideration wherein each of the parties provide or promise to provide something in exchange for what the other is to provide; for certain types of agreement, it must be in a specified form to be valid; it must be in definite terms in order for the courts to determine what the parties have decided upon; and

Finance Effects Economy Essay Example | Topics and Well Written Essays - 1000 words

Finance Effects Economy - Essay Example A finance student studies a bachelor degree in business administration with a major in finance. The purpose of this paper is to discuss and describe the history of finance, how it affects the economy, and areas of specialization in finance. The field of finance as we know it today began in the 1950’s. When finance education started it was often part of the curriculum of economics or a part of business administration. Today the focus of the finance major is integrated as part of a business administration education. The majority of undergraduate finance degrees in the U.S. are part of a business curriculum, but at the graduate level finance is often taught based on the economic approach (Miller). One of the primary focuses of a finance education is to teach students how to make better decisions. Finance professionals are supposed to be able to maximize shareholders wealth (Besley & Brigham). The finance field is often referred to as the cousin of accounting due to the fact that a lot of the concepts and data used in finance come from accounting information. Many small companies integrate the accounting and finance departments. Two extremely important financial concepts in finance, risk and return, were first introduced to the general public by Harry Markowitz in 1952 in his publication Portfolio Selection published in the Journal of Finance. The work finance people perform in an organization is very important. For instance once the accountant completes the accounting cycle and prepares the financial statements the finance people can analyze the information to determine the financial performance of the company. The four major financial statements are the income statement, balance sheet, statement of retained earnings, and statement of cash flow. The income statement measures the profitability of a company, while the balance sheet illustrates the financial condition of a company at a specific point in time. The statement of cash flow is composed of three sec tions: operating, financing, and investments. The financial statements for the entire fiscal year are included within the contents of the annual report. Public companies also release quarterly financial statements to comply with the regulations of the Security and Exchange Commission (SEC). Three financial analysis the can be used to analyze the financial statements are ratio analysis, vertical analysis, and horizontal analysis. Ratio analysis is a tool that is often used by finance professionals. The five categories of ratio analysis are liquidity, solvency, profitability, activity, and coverage ratios (AccountingExplained). Horizontal analysis can be used to compare the different items or elements of the financial statements against the performance of the previous accounting period. The objective of vertical analysis is to report each amount or item in the financial statement as a percentage of another item. When performing vertical analysis on an income statement all the items of the statement are typically compared against the sales total of the company. The discipline of finance can also be used for other analytical purposes. Financial managers often have to evaluate the firm’s valuation and the valuation of other companies that the firm might invest in. A financial model to evaluate the risk of a

Clinical Focus and Advocacy in Patients Care in Specialist Nursing Literature review

Clinical Focus and Advocacy in Patients Care in Specialist Nursing Practice - Literature review Example The current trend of offering master’s programs in nursing schools was seen to start begin around the 1970’s with the gradual phasing out of the public health nursing programs in most of the schools offering public health studies. The very first programs to start preparing and offering Clinical Nurse Specialist (CNS) courses started doing so in the 1950’s (Fulton, Lyon and Goudreau 2010). A clinical nurse specialist (CNS) can be described basically as an advanced practice and registered nurse who has undergone graduate preparation resulting in their earning a master’s or doctorate from one of the programs that prepares clinical nursing specialists. Clinical nurse specialists are generally experts at the diagnosis and eventual treatment of illness that fall in their area of expertise. The focus of clinical nurse specialist generally falls into three basic areas; these areas are administration, patients and their respective families and nurse management. Although these three spheres are seen to be interrelated and it is quite normal for them to overlap, they are quite different and possess distinctive focus from each other. In all three areas of influence, the primary role of the CNS is to ensure that there is continuous improvement of the nursing care and patient outcome in general (Fulton, Lyon and Goudreau 2010). The rest of a medical facilities nursing staff tend to look to the Clinical Nurse Specialist to help them improve the efficiency in the work place as well as to receive guidance as they perform their everyday nursing duties. Some of the key elements of practicing CNS is to ensure that there is the creation of an environment that can be seen to implement effective system changes and mentoring programs that will help in the empowerment of nurses who are better able to adequately respond to the diverse patient needs, and develop caring best practices that are not only evidence based but are also able to alleviate

The Evolution of Linux Research Paper Example | Topics and Well Written Essays - 750 words

The Evolution of Linux - Research Paper Example This document focuses on the evolution of Linux since its establishment to the present version. The main reason for discussing the development of Linux is to understand various changes that have occurred in Linux. In addition, studying the evolution of Linux is of importance to planning for future development of the computer system. The origin of Linux can be traced back to the establishment of UNIX in 1969. UNIX was developed and created at Bell Labs in the process of developing a simple system with recyclable code. However, the primary development of Linux occurred in 1991. Linux was initially developed as a self-contained kernel by Linus Toverlds with a goal of enhancing UNIX compatibility. Development and evaluation of Linux have extensively relied on user collaboration and experience with the operating system from many parts of the world. The system is designed to operate reliably and efficiently on common personal computer hardware although it can also run on other platforms (Silberschatz, 2002). Linux has undergone evolution from one version to the other since it was developed. The first version of the Linux Kernel is Linux version 0.01. The version was developed in May 1991 by the Linux developer Linus Toverlds. Linux version 0.01 had limited features and was limited to specific processors and hardware. The version was only operating on PC hardware and 80386-compatible Intel processors. In addition, Linux version 0.01 was only supported by the Minx file system. It was also difficult to network with the Linux version 0.01 because it had no networking capability (Silberschatz, 2002). On October 5th, 1991, Torvalds released a better version of Linux known as Linux version 0.02 that required Minix to run. However, it received more attention than Linux version 0.01. The kernel improved rapidly within the year, and large number of users and volunteers communicated through social media on the internet. In December 1991, an operational,