The Haber Process Essays - Industrial Gases, Equilibrium Chemistry

The Haber Process 1. The Haber Process During the first decade of the twentieth century the world-wide demand for ammonia for use in fertilisers (in the form of nitrates) and in the production of explosives for use in mining and warfare could only be satisfied on a large scale from deposits of guano in Chile (2). Though this deposit was of huge size (approximately five feet thick and 385 kilometres long) it represented a rapidly depleting resource when compared to world-wide demand. As a result of this there was much research into how ammonia could be produced from atmospheric nitrogen. The problem was eventually solved by Fritz Haber (1868 - 1934) in a process which came to be known as the Haber Process or the Haber - Bosch Process. Haber developed a method for synthesising ammonia utilising atmospheric nitrogen and had established the conditions for large scale synthesis of ammonia by 1909 and the process was handed over to Carl Bosch for industrial development (1). the reaction is a simple equilibrium reaction which occurs in gaseous state as follows; N2 (g) + 3H2 (g) = 2NH3 (g) heat of enthalpy = -92.6 kJ/mol In predicting how to obtain the highest yield from this reaction we must refer to Le Chatlier's Principle. This states that for an equilibrium reaction the equilibrium will work in the opposite direction to the conditions forced upon it. The conditions most pertinent to the above reaction are temperature and pressure. The pressure exerted by any gas or mixture of gasses in an enclosed space is directly proportional to the number of atoms or molecules of gas regardless of their size or molecular mass. Reference to the above reaction shows that, as the reaction moves to the right the number of molecules and hence the pressure decreases. Therefore the reaction moving to the right (i.e. towards the product required) is favoured by an increase in pressure. With regard to temperature, the reaction moving to the right is exothermic i.e. it gives off energy (in the form of heat). Therefore reference to Le Chatlier's Principle shows that the reaction to the right is favoured by low temperatures. However, when Haber placed the reactants together under these conditions it was shown that the rate of reaction was so slow as to render the process unfeasible as an industrial process. This is because of an unusually high activation energy. The activation energy of a reaction is the energy required by the reactants to achieve an intermediate state required before they form the products. In the case of the above reaction the intermediate state requires the dissociation of diatomic gaseous nitrogen. The triple bond found between two nitrogen atoms when they form diatomic nitrogen is amongst the strongest chemical bonds known. this leads to an extremely high activation energy. At extremely high temperature the nitrogen molecule will dissociate and so, as the temperature approaches this point the rate at which the reaction to the right occurs and therefore the speed with which equilibrium is reached increases rapidly. Unfortunately experimentation showed that, as temperature approached the point at which the speed of the reaction was sufficient to produce a viable reaction the amount of ammonia produced was so low that the reaction was still unfeasible on as an industrial process. Faced with this failure to find conditions suitable for an industrial process Haber began to experiment to find a catalyst that would facilitate the reaction. A catalyst is a substance that reduces the activation energy of a reaction, thus increasing the speed at which the reaction occurs, or in the case of equilibrium reactions the speed at which equilibrium is reached. After hundreds of experiments Haber discovered that a fast enough reaction with a high enough yield of ammonia would occur with a pressure between 200 and 400 atmospheres and at a temperature between 670K and 920K in the presence of a catalyst of iron (in the form of iron filings to increase its active surface area) plus a few percent of oxides of potassium and aluminium. This process was first demonstrated in 1909 and patented as the Haber Process in 1910 (3). Experiments aimed at finding the most efficient conditions for the reaction have since resulted in the process described by the flow diagram

One Fell Swoop

One Fell Swoop One Fell Swoop One Fell Swoop By Simon Kewin Its quite common for people to use the phrase one fowl swoop (or even one foul swoop) when they want to convey the idea of an event taking place all at once and very suddenly. But why do we say this? Is the phrase something to do with birds swooping to the ground in a great rush? In fact the phrase does have some connection to birds but both one fowl swoop and one foul swoop are incorrect. The original phrase is actually one fell swoop. The phrase is an old one. It may have been coined by Shakespeare in 1605, or he may merely have popularised it. In any case, the following lines can be found in Macbeth (Act 4, scene 3). Macduff has just heard that his family have been killed: All my pretty ones? Did you say all?- O hell-kite!- All? What, all my pretty chickens, and their dam, At one fell swoop? So Shakespeare does employ the image of a bird of prey, a hell-kite, swooping to the ground to kill all his pretty chickens. But the word he uses is fell. This, of course, is still a common word, but Shakespeare is using a rather obscure sense of that word, meaning of terrible evil or ferocity. Its source is the same as felon, a wicked person. So, â€Å"one fell swoop† originally meant a sudden, ferocious attack, although the sense of savagery in the phrase has been lost over the years and people now use it to mean, simply, all at once. Footnote : the dive of a bird of prey is more accurately referred to as a stoop rather than a swoop as in, for example, â€Å"the peregrine falcon can reach speeds of over 200 mph in a stoop†. Want to improve your English in five minutes a day? Get a subscription and start receiving our writing tips and exercises daily! Keep learning! Browse the Expressions category, check our popular posts, or choose a related post below:12 Signs and Symbols You Should KnowRunning Amok or Running Amuck?Shore It Up

Lesson Plan Assignment Example | Topics and Well Written Essays - 1000 words

Lesson Plan - Assignment Example Proper addressing of these objectives enable learners be in a position to write short stories that are not only complete but also creative. Secondly, teaching students on proper editing skills will result to the learners applying them effectively on their writing. Finally, learners will be in a position to write brief contents that are of high quality, this is due to their comprehension of the difference between quality writings and quantity. Since writing an outstanding mini saga requires a lot of creativity, I will ensure that I psychologically prepare the students for the lesson. First, I will introduce the topic by writing the word â€Å"Saga† on the board before asking students if they have any prior knowledge of the term. After informing them that a Saga is a long story normally comprising of heroic events or something dramatic, I will proceed to state that the day’s lesson will not be on â€Å"saga† but â€Å"mini saga†, an implication that it will be brief. Once the class is aware of the day’s lesson, I will start by first defining the term Mini saga as a brief form of writing, normally has exactly fifty words excluding the title. The fifty word mini saga comprises of three sections, which are beginning, middle and end. I will then state a brief history of the mini saga by stating that Brian Aldiss is the man behind this form of writing. The main reason why Aldiss came up with the mini saga form of writing is that according to him, telling a story in a few words not only was it fun but also a challenging experience (â€Å"British Council†). After ensuring the class has full knowledge on the term mini saga, I will begin the lesson teaching them on how to come up with an appropriate and magnificent mini saga. Learners will participate in a classroom discussion where they will display their writing and editing skills.

Introduction to Universal Design for Learning -Guiding Questions Assignment

Introduction to Universal Design for Learning -Guiding Questions - Assignment Example Question 2. The framework of UDL comprises three basic principles. One of such principles tends to provide numerous ways of representation. This would let the individuals to know the instructions as directed by the instructors. In this principle, it can be concluded that learning differs in the way the learners recognize and use information. Another principle is identified to be providing multiple ways of action and expression. This would let the individuals to know the process through which learning occurs. In this principle, it can be concluded that the learning differentiates based on the approach of the learners in navigating the information. Moreover, the third principle is offering numerous ways of engagement. This would let the learners to know the reason for learning. Based on this principle, it can be concluded that certain affects are crucial element of learning and these would lead towards the progress or deterioration in learning procedure (National Center on Universal De sign for Learning, â€Å"Home†; Strauss, â€Å"Willingham: 3 Brain Facts Every Educator Should Know†). Question 3. Identifiably, there exists a significant association between the three principles of the UDL and three primary neutral networks that entail ‘recognition’, ‘affective’ as well as ‘strategic.’ In relation to the first principle concerning the deliverance of multiple ways of representation, it can be affirmed that the learners get influenced towards recognizing all the elements of learning. Moreover, with regards to the second principle, it can be apparently observed that the instructors often remain involved in offering numerous ways of action and expression, which in turn, results in making the learning procedure much more strategic. Furthermore, the third principle suggesting the offering of multiple ways to engagement for the

Mathews Corporation Case Study Example | Topics and Well Written Essays - 5500 words

Mathews Corporation - Case Study Example One more labels it produces shields electronic devices by dispersing their temperature or static. A number of labels work in temperatures colder than 50 below zero, others burn or produce sounds in the dark, cover themselves, or still stick to oily or greasy products. So this is the little introduction regarding the company business and production. The key function carry out by company is to run 30 business units and manufacture and distributes its labels from 35 locations in 15 countries on five continents around the world. There are a lot of countries where this company supplies its products. The basic function of the company is to produce the high-performance labels and related industrial safety products. In this system Mathew Corporation takes the order both in the manual and electronic (internet) methods. Then there is prices discussion and dealing on the specific produced. All these functions are functioning good but not efficiently. There is need of total automation of the whole order processing, information management, and strategic decision making system. The domestic market is in a mature stage, while the international market is in the rapid-growth stage. The signs, labels and safe product industry's curve is flatter, showing slow in growth and can be considered to be in the stage of expansion. The signs, labels and safe product industry's sales is expanding and continuously gaining profit from their cash cow products. In this life cycle of the industry, there are some late entrants and are trying to put all efforts to have a share in the market. The leading company in the industry like Mathew's Corporation is separating their product from other lower-cost offering in order to increase volume of sales and gain profits. What are the key processes At present the company is running many processes like order processing, online information management, and new production catalog management. There are 19 separate databases; each comprises its own file servers and transaction software. And these systems could not communicate with each other. Every database unit had its own sales tracking system, reasoning misunderstanding among Matthews' employees and customers. These systems are developed to handle company's different type of product and management system. What are some of the competitive forces at work Being conscious of the activities of the competitors of Mathews Corporation will analyze the possible opportunities of every ventures of their company through differentiating their products and services against their rivals, considering the aspects that indirectly

Principles Of Management Nokia Marketing Essay

Principles Of Management Nokia Marketing Essay When Nokia phones were first introduced, they needed a lot of promoting and advertising because they were not recognized enough to sell based on their quality and offers to their consumers, so this is where Nokia spent the biggest quantity of money promoting their goods and establishing their brand as a leader in the communications market. These refer to government policies, regulations and legal issues in the country of operation. For example, employment laws, taxation policy and government stability. Political decisions can impact on many important areas for business such as the education of the workforce, the nation health and the quality of the economy infrastructure such as the road and rail system. Legal constraints, such as 3G, must be considered because many businesses plan to make a profit so they may be tempted to misinform their customers about pricing, products quality and the availability of their goods. Also, they may try to cut expenses by using lower quality materials in their products, such as weaker resources for Nokia cases and batteries. Also some companies may set out their waste in ways that harm the environment without ensuring high standards of hygiene and safety in the workplace. Including, outlet stores, which are illegal and can cause legal problems for companies. In 2000, the UK Government started to accept bids from thirteen companies who wanted to run a licence to sell next-generation mobile phones. It raised  £22.47, a neat sum to anybody. Some businesses see profits as more valuable than a strong ethical code and this can run behavior and business conduct. Some unethical practices are illegal and companies can not become involved in them. However there are also some practices that are legal by law but are considered highly unethical by the consuming public. Companies who take on in these practices can lose a lot of market share if they are caught. For example, cosmetic testing on animals is legal, but some of the general public arent happy about it and boycott. Because of this companies, companies must be very cautious about how they conduct themselves. In the communications market, technology is most probably the most important factor that companies like Nokia have to take into account. They must keep up to date with all the newest technological advances, such as camera and video phones, if they intend to obtain the biggest market share and keep ahead of their competitors, such as Sony and Panasonic.

Primitive Mans Relationship with Fire and the Environment :: Environment Environmental Pollution Preservation

Primitive Man's Relationship with Fire and the Environment Common knowledge holds it that primitive man was a being barely more developed than the ape, existing without culture, innovation, or technological prowess. This belief focuses especially on homo erectus, an ancestor of man who lived from about 2 million to roughly 200,000 years ago. It is commonly believed that h. erectus was a creature existing in technological stasis, without the ability to advance his existence through innovation, and void of culture. This type of thinking could quickly be altered, though, if recent discoveries hold true. Recent evidence points to a distinct possibility that h. erectus may have been the first ancestor of man to harness the power of fire. Such a finding would greatly alter the current system of beliefs in regard to the evolution of man and the status of man's ancestors during the time of h. erectus. These findings would indicate that h. erectus did have some culture, and some innovative skill that allowed him to control his environment. The eviden ce supporting the taming of fire by h. erectus is not beyond reproach, though. In fact, it has come under heavy questioning. A desire for even stronger evidence could eventually dispel the notion that this primitive version of man could control fire, and allow for maintenance of the current belief that man did not truly evolve into a being with any type of culture until the existence of homo sapiens. Up until the year 2000, a great deal of evidence surrounding man's use and control of fire indicated that such technology probably did not appear until roughly 200,000 years ago. The implication that h. sapiens was the first in the line of mankind to control fire was supported by evidence found at a site in Zhoukoudian, China. While it had been believed for some time that Zhoukoudian was the first site of controlled fire, evidence found through more exhaustive research indicates otherwise. There are no hearths at the site in China. Nor are there any food remnants. Such evidence leads to the belief that the burnt bones found at the site are probably the result of a natural fire (Wuethrich). The lack of strong evidence supporting the site as one in which man's control of fire is displayed supported the belief that h. erectus lacked technological prowess and culture. The next best candidate for the site of man's first documented control of fire was a collapsed sea cave in Menez Dregan, France.