Reactivity Definition in Chemistry

Reactivity Definition in Chemistry In chemistry, reactivity is a measure of how readily a substance undergoes a chemical reaction. The reaction can involve the substance on its own or with other atoms or compounds, generally accompanied by a release of energy. The most reactive elements and compounds may ignite spontaneously or explosively. They generally burn in water as well as the oxygen in the air. Reactivity is dependent upon temperature. Increasing temperature increases the energy available for a chemical reaction, usually making it more likely. Another definition of reactivity is that it is the scientific study of chemical reactions and their kinetics. Reactivity Trend in the Periodic Table The organization of elements on the periodic table allows for predictions concerning reactivity. Both highly electropositive and highly electronegative elements have a strong tendency to react. These elements are located in the upper right and lower left corners of the periodic table and in certain element groups. The halogens, alkali metals, and alkaline earth metals are highly reactive. The most reactive element is fluorine, the first element in the  halogen group.The most reactive metal is francium, the last alkali metal. However, francium is an unstable radioactive element, only found in trace amounts. The most reactive metal that has a stable isotope is cesium, which is located directly above francium on the periodic table.The least reactive elements are the noble gases. Within this group, helium is the least reactive element, forming no stable compounds.Metal can have multiple oxidation states and tend to have intermediate reactivity. Metals with low reactivity are called noble metals.  The least reactive metal is platinum, followed by gold. Because of their low reactivity, these metals dont readily dissolve in strong acids. Aqua regia, a mixture of nitric acid and hydrochloric acid, is used to dissolve platinum and gold. How Reactivity Works A substance reacts when the products formed from a chemical reaction have lower energy (higher stability) than the reactants. The energy difference can be predicted using valence bond theory, atomic orbital theory, and molecular orbital theory. Basically, it boils down to the stability of electrons in their orbitals. Unpaired electrons with no electrons in comparable orbitals are the most likely to interact with orbitals from other atoms, forming chemical bonds. Unpaired electrons with degenerate orbitals that are half-filled are more stable but still reactive. The least reactive atoms are those with a filled set of orbitals (octet). The stability of the electrons in atoms determines not only the reactivity of an atom but its valence and the type of chemical bonds it can form. For example, carbon usually has a valence of 4 and forms 4 bonds because its ground state valence electron configuration is half-filled at  2s2  2p2. A simple explanation of reactivity is that it increases with the ease of accepting or donating an electron. In the case of carbon, an atom can either accept 4 electrons to fill its orbital or (less often) donate the four outer electrons. While the model is based on atomic behavior, the same principle applies to ions and compounds. Reactivity is affected by the physical properties of a sample, its chemical purity, and the presence of other substances. In other words, reactivity depends on the context in which a substance is viewed. For example, baking soda and water are not particularly reactive, while baking soda and vinegar readily react to form carbon dioxide gas and sodium acetate. Particle size affects reactivity. For example, a pile of corn starch is relatively inert. If one applies a direct flame to the starch, its difficult to initiate a combustion reaction. However, if the corn starch is vaporized to make a cloud of particles, it readily ignites. Sometimes the term reactivity  is also used to describe how quickly a material will react or the rate of the chemical reaction. Under this definition the chance of reacting and the speed of the reaction are related to each other by the rate law: Rate k[A] Where rate is the change in molar concentration per second in the rate-determining step of the reaction, k is the reaction constant (independent of concentration), and [A] is the product of the molar concentration of the reactants raised to the reaction order (which is one, in the basic equation). According to the equation, the higher the reactivity of the compound, the higher its value for k and rate. Stability Versus Reactivity Sometimes a species with low reactivity is called stable, but care should be taken to make the context clear. Stability can also refer to slow radioactive decay or to the transition of electrons from the excited state  to less energetic levels (as in luminescence). A nonreactive species may be called inert. However, most inert species actually do react under the right conditions to form complexes and compounds (e.g., higher atomic number noble gases).

Enzyme-controlled reaction Essays

Enzyme-controlled reaction Essays Enzyme-controlled reaction Essay Enzyme-controlled reaction Essay Write an account of how any two factors affect the rate of an enzyme-controlled reaction. How do these factors affect the chemical construction and belongingss of the enzyme. Many things can impact the rate of enzyme activity. The temperature of the enzyme. the pH of the solution. the concentration of the enzyme. substrate and the merchandise. Besides. another affector is the figure of competitory and non-competitive inhibitors. As I can non explicate them all. I have chosen to explicate the consequence of temperature and besides the consequence of inhibitors on enzyme activity. Temperature: As the temperature is increased the kinetic theory is applied. More energy is present and the molecules move fast. This increases the opportunity of hit between the enzymes and substrate and so increasing the rate of reaction. At these higher temperatures the active site of the enzyme is really reasonably flexible. The heat has broken a little figure of Hydrogen bonds which hold the site to its form. Harmonizing to the lock and cardinal theory the enzyme’s active site is specific to the substrate and so they fit together. The enzyme merely catalases a individual reaction. As the site is now flexible. there is an increased sum of induced tantrum and so the production of an enzyme-substrate composite is more likely. If the temperature is lower. the active site of the enzyme is much less flexible as there is the maximal figure of bonds present keeping it all together. At the optimal temperature shown on the curve. the conditions are perfect for this enzyme to work in. Different enzymes have different optimums. For illustration. human enzymes work at organic structure temperature whereas there are thermophilic/stable enzymes which are optimal at much higher temperatures such as 85C. Once the enzyme-substrate composite has been formed. the activation energy is lowered and the reaction is at its optimum. For mammalian enzymes. the rate of reaction doubles for every 10C alteration. Once the temperature goes beyond optimum. the rate of reaction lowers. At a certain point on this negative gradient. the enzyme becomes denatured. The third construction is changed and the enzyme becomes for good damaged. Inhibitors: There are two types of inhibitors to an enzyme. They are competitory and non-competitive. The competitory type are similar in form to that of the substrate and so fit into the active site of the enzyme. non responding. hence suppressing the production of an enzyme-substrate composite. An illustration of this is Malonate. It is similar in form to that of succinate and competes for the active site of succinate dehydrogenase which is involved in the krebs rhythm. Another illustration is that of Acetohydroxamic Acid which is similar in form to urea. It competes for the active site of urease. Fortunately. the effects are reversible. To antagonize the effects of an inhibitor without being able to take it itself one should increase the concentration of the substrate to increase the ratio of substrate to inhibitor. The nons of non-competitive inhibitors are really good known as they have been used to harm worlds or other lifeforms. These are things such as nitrile. heavy metals ( which are reversible as they are slackly bound to the enzyme ) and phosphate insect powders and nervus gasses ( which are irreversible and do decease ) . What do you understand by the undermentioned footings: I ) Enzyme-Substrate Complex two ) Enzyme Specificity three ) Prosthetic Group I ) I have mentioned this already in my earlier replies. This composite is what is produced when the substrate tantrums and binds to the active site of the enzyme. In this province. the conditions are favorable and the bonds are weak intending the merchandise can be easy formed. two ) I have besides mentioned this in my above replies. It merely means that the enzyme is specific to one substrate. The lock and cardinal theory explains this where the enzyme is the lock and the key. being the substrate. fits merely into that lock. The enzyme is wholly specific and lone catalases a individual reaction. three ) In the prosthetic group are non-protein molecules. They are covalently ( strongly ) bonded to the enzyme and must be at that place for the enzyme to work decently. If removed they will most likely cause the enzyme to denature. They are one type of an enzyme co-factor. Such illustrations of this are haemoglobin. chlorophyll and cytochromes.

Personal development planning Essay Example | Topics and Well Written Essays - 1000 words

Personal development planning - Essay Example A degree in Business Management is the best course that a person might undertake, especially at this age when big multi-billion dollar corporations rule the world. Business Management prepares the student for the business world by equipping them with the necessary skills that will enable them to excel from managing a local kiosk or a restaurant chain to offering them the capacity to possess and manage their own companies. Achieving such a feat may appear impossible, but with a Business Management degree, the student will be well equipped to achieve greatness. According to an Arcadia case study titled ‘Recruiting, selecting and training entrepreneurial managers’, â€Å"the success of any business depends heavily on the effectiveness of its managers†Ã‚  (Business Case Studies, 2015 p. 2). The obtaining of a business management degree guarantees the ‘opening of doors’ to a world full of opportunities for a vigilant pursuer of this common and most marketable course of study in the market. Without any exaggeration, the world is just a big string of businesses and business opportunities. From the grocery stall, to the rented apartment to the movie hall, everything is a business center waiting for the business management graduate to take advantage of. In essence, business management empowers its followers to rule the world. For a student to carry out the Business Management course, he/she will have to have or strive to achieve the following skills and knowledge. One of them is good organizational skills. In order to run the business, the manager must be able to take responsibility for bringing together different departments, be able to enforce and outline processes together with outlining what tasks each member of the organization is supposed to perform. The manager needs to be able to connect things together. Czarniawska (2004) expands on connection by suggesting that ‘connection’ is

Common diseases in Colombia Essay Example | Topics and Well Written Essays - 250 words

Common diseases in Colombia - Essay Example   This is followed closely by vector borne diseases especially malaria, dengue and yellow fever. Statistics from CIA and CDC indicate that the most predominant of these diseases affecting both locals and travellers (Central Intelligence Agency, 2014). Risk factorsThe risk factors of this disease are the food and water borne diseases due to contaminated food and water. Personal hygiene and sanitation is not emphasized upon in this nation hence the reason they use contaminated water especially from the Pacific Ocean and their food is contaminated. How it is diagnosed Typhoid whose mortality rate reaches even 20% of those diagnosed is spread through food and water contamination. The sick patient experiences high fever that is not sustainable and tests of the blood cells indicate an increase in the white blood cells. The S. typhi bacteria are also analyzed in the urine test which is carried out after the first week of fever. Typhoid is treated using a dose of strong antibiotics such as levofloxacin which clears up the symptoms. Intravenous hydration and the use of antipyretics can also be employed. This is in addition to ensuring proper nutrition and close medical check-ups to monitor treatment. Education on lifestyle modificationIn order to prevent typhoid, eating of washed food and boiled water is important. Thoroughly cooking food as well as peeling fruits is also necessary. For the travellers, typhoid vaccine is recommended before travelling to this nation in addition to not eating food sold on the streets.

European Colonization of the Caribbean Essay Example for Free

European Colonization of the Caribbean Essay The Spanish conquests in the Americas encouraged other European countries to expand their domains in the New World. In the latter half of the 16th century, Portugal conquered Brazil in the hope of upsetting Spain in South America. Between 1690 and 1650, the French, Dutch, and English made unsuccessful attempts to occupy the northern coasts of Brazil and the neighboring islands of St. Kitts and the Leeward Islands. However, with the onset of the Thirty Years War, Spain began to weaken. His colonial possessions in the Caribbean were occupied by the English, French, and the Dutch. Spanish and Portugal Conquests Checked Generally, the arrival of other European countries in the New World (with the thought of conquest) forced Spain and Portugal to limit their conquest. For example, in 1621, the Dutch attacked several Spanish colonies in the Caribbean and succeeded in occupying the islands of Curacao, St. Martin, and Araya. The acquisition of vast mount of gold by the Spaniards in the New World attracted the attention of other powers. To their minds, God does not wish the world to be divided only between Spain and Portugal (Treaty of Tordesillas). They wanted a significant share in the wealth of the Americas. The Political and Economic System in Europe The Thirty Years War (to which Spain was heavily involved) forced Spain to cut expenditures at home and raise taxes and quotas in the Caribbean (Cuba, Puerto Rico). In addition, the Spaniards began to implement the plantation system to increase revenues (to finance her wars in Europe). Trade was limited to Spain and he American colonies. The reason is clear: if trade was opened to other European countries, the prospect of a unidirectional prosperity would be prevented (other nations would benefit from the trade). This system is called the ‘mercantilist system. ’ Impact of Mercantilism in the Caribbean and the Outcome Precious metals (gold, silver) became the basis of the mercantilist system. It served as the medium of exchange between the colonies and the mother country. Mines were established all throughout the Caribbean in order to maintain the flow of metals to the mother country. To fasten the procurement of precious metals, the Spaniards (and other Europeans) utilize slave labor (African slaves). In some sense, Spanish wealth (based on precious metals and product quotas) was essentially created by slave labor (which was very oppressive and unchristian). The wealth Spain accumulated from the New World also attracted the attention of pirates. They were of two types: buccaneer and marooner. Buccaneer is a group of pirates that had bases in the Caribbean (in a sense, they were considered the most powerful type of pirate). Marooner is a generic term applied to Spaniards who deserted the Spanish Navy to harass Spanish shipping lines in the Caribbean. The Caribbean Society and European Influences Caribbean society was modeled after European society. Some of the influences are as follows: 1) adoption of Catholicism as the main religion (in the case of Spain), 2) Baroque and Gothic architecture, 3) European city planning, and 4) the plantation system. At the top of the plantation system was the landowner. The manager (usually a relative of the owner) was in the middle position. At the bottom were the slaves and the serfs (local population serving in the plantation). The slaves were often treated harshly by the Europeans. They perceived them as members of an inferior race destined to serve white men’s greed. The same case (though not as oppressive as that of slaves) could be said about women. Women were confined to households, serving their masters with much dedication (by force) as that of serfs. Racial Hierarchy in the Caribbean Race played an important role in Caribbean society. Race served as the determining factor of administration; a form of societal control. The Europeans were at the top of the racial hierarchy. At the bottom were the slaves, the local population, and Chinese traders (which were seen with contempt by the Europeans). The European themselves were racially categorized. The peninsulares were Europeans born in their mother countries. The insulares were pure Europeans born in the colonies. The mestizos were of European and Indian descent. Women played a minor role in Caribbean society. They were confined to household chores (like cooking and child rearing). Maroonage strained Spain’s resources in the New World. The revenues derived by Spain from plantations (the same case with other Europeans) were taken by the maroons (on the way to Spain). The oppressive policies of the Spaniards in Cuba led to the Ten Years War. The slaves and the local population rose in arms against Spanish rule. Reference Toynbee, Arnold. 1989. History of the World. New York: Macmillan Publishing Company.

Hamlet: Branaghs Ophelia and Showalters Representing Ophelia Essay

Hamlet: Branagh's Ophelia and Showalter's Representing Ophelia      Ã‚  Ã‚   Ophelia falls to the floor, her screams contrasting eerily with the song pieces she uses as her speech.   In an instant she is writhing and thrusting her pelvis in such a gross sexual manner that it becomes clear that, in his film interpretation of William Shakespeare's Hamlet, Kenneth Branagh wants to imply a strong relationship between female insanity and female sexuality.   Such a relationship is exactly what Elaine Showalter discusses in her essay -- "Representing Ophelia: Women, Madness, and the Responsibilities of Feminist Criticism" -- "I will be showing first of all the representational bonds between female insanity and female sexuality" (Showalter 223).   "Tracing" various representations of Ophelia throughout history, Showalter attempts to tell Ophelia's story by examining the way in which the culture of a society, their views of women, and psychiatric theory relates to the representation of Ophelia at that time.   With the amount of attention Branagh a ffords the role of Ophelia in his film, and because Branagh's Ophelia represents many of Showalter's ideas about Ophelia's drowning death, the bond between sexuality and insanity, and the conventions of femininity, Branagh's Ophelia can supplement Showalter's essay -- her "trace" of the history of representation of Ophelia -- serving as a Post-modern example of the representation of Ophelia.       In his representation of Ophelia, the relationship that Branagh attempts to establish between female insanity and female sexuality is a strong and obvious one.   Through costume, cinematography, blocking, and various other aspects, Branagh makes clear his interpretation that Ophelia's insanity is t... ...helia.   Not only does Branagh use the conventions of femininity that Showalter describes but he also relies heavily upon ideas similar to Showalter's, that everything about Ophelia is symbolic, to convey his Ophelia as representative of femininity and to express the inverse correlation that such femininity has with Ophelia's sexuality and her insanity.    Works Cited Hamlet.   Dir. Kenneth Branagh.   Perf. Julie Christie, Billy Crystal, Kate Winslett.   Castle   Rock Entertainment, 1996. Shakespeare, William. Hamlet. Ed. Susanne L. Wofford. Case Studies in Contemporary Criticism. Boston: St. Martin's, 1994. Showalter, Elaine. "Representing Ophelia: Women, Madness, and the Responsibilities of   Feminist Criticism." William  Ã‚  Ã‚  Ã‚   Shakespeare: Hamlet. Ed. Susanne L. Wofford. Case   Studies in Contemporary Criticism. Boston: St. Martin's, 1994. 220-238.

Homeostatic Imbalances. Hypertension and Diabetes Essay

Hypertension is a common health problem especially among people over age of 60 years. This disease is diagnostic when a patient blood pressure is more than 140 to 159 over 90 to 99. Blood pressure refers to the pressure that blood applies to the inner walls of the Diabetes is an endocrine system disorder that occurs when the body is unable to control or balance the amount of sugar in blood and within bodily tissues. You know that the human body is like a machine, with organ systems that are specialized in certain functions, and interact with each other to allow all vital functions to happen. For the body to stay healthy, it is essential that its internal environment is stable and balanced despite the different changes that can occur inside or outside of the system. The natural and dynamic property of the body to maintain these conditions within certain normal levels is called homeostasis. When this property of balance is disturbed a disease may happen. I would like to explain to you what occurs in your specific case. The normal levels of sugar in blood are between 70 and 110 milligrams of glucose per 100 milliliters of blood , when the levels of glucose begin to fall because the person is working out or have been long time without eating the receptors in the body send a message to the hypothalamus which sends a message to the pancreas, which is the major organ of the endocrine system, so it secretes the hormone glucagon that stimulate the cells to release glucose which control the high levels of sugar in blood. On others hands, when the levers of sugar in blood begin to increase the pancreas releases insulin which stimulate cells to eliminate glucose from the blood. These two responses of the organism to internal changes are part of negative feedback system that allows the body to return to a normal state. In your specific case the feedback system is not able to maintain the homeostatic balance because your body does not produce enough or overproduces the hormone insulin and sometimes glucagon; in addition, the receptor sites within target cells could cause the body to become insensitive to these chemicals. Finally, the malfunction of homeostasis is the cause of the type of diabetes that you are suffering from. But don’t be scared because you are very young and strong. It is important that you know and understand everything about your disease in order to be educated and get your diabetes under control. arteries. When this pressure is over the limits, it is very dangerous and can increase the risk of heart failure, heart attack, stroke,  and kidney failure. For that reasons I would like that you understand what the reason of your problem is. When the heart beats too hard and fast, the levels of blood pressure increase. In normal conditions our body has a complex system of regulation that allows the levels of pressure back to the normal ranks. This system which is known as negative feedback is responsible for achieving balance in our bodies even if external or internal changes occur. When any internal or external factor makes the blood pressure rise, we have specialized cells located in the walls of some blood vessels that are able to detect the problem and send nerve impulses to the brain which sends nerves impulses to the heart and blood vessel that receive the information. As a result, the heart rate decrease, the blood vessels dilate, and the blood pressure goes down. Finally, the body goes back to the balance condition that is called homeostasis. In your case this natural process does not occur and for that reason you are suffering from hypertension.

Golden Parachute

Often in a stack of current newspapers, the front page topics that will catch your attention are ethical issues behind upper management compensations; in this case, on March 30th 2009, the issue that surfaced was Rick Wagoner’s leave from GM and his retirement package and how his actual/ base compensation doubled in his last year from approximately $7M to $15M. (7) With the current economic crisis, many people outside the business society have become aware of the ridiculously high income difference between top managers and regular working citizens. For instance, terms such as ‘golden parachute’ have been put under the limelight and are scrutinized. Golden parachutes are severance pays to CEOs when they leave their company. The amount of money is usually influenced by the size of the business and the effort they put in. The golden parachute was once used to ethically to compensate CEOs who sacrificed their time and effort for the business; however, this is currently not the only case. Before we get into more detail, it is important to understand that the golden parachute once had a reason for being employed. With many mergers and acquisitions during the second industrial revolution, CEOs were offered compensations proportional to how much their effort was worth. According to the Journal of Business Ethics, this was an ethical standpoint because it was followed by two positive effects. First of all, golden parachutes encouraged mergers and acquisitions as opposed to bankruptcy. For instance, the CEO would choose to merge with a competitor and leave with an enticing amount of money. This minimized unemployment and loss of structural capital which is result of bankruptcy. Another positive effect in using the golden parachute was attracting an effective management team. Great CEOs are essential for the success of businesses, yet great CEOs are low on supply. As a result, golden parachutes can be ‘recruitment tool[s]’ and can bring the business back into an economically stable position. In essence, golden parachutes were and can still be ethical if the CEOs receive compensations proportional to their effort that was put forth to the company. 1) However, although these compensation packages began as an alternative that maximizes the sum of stakeholders’ satisfaction, many CEOs began to abuse this privilege. Highlighted by the principle agent theory, most people would prioritize personal incentives above all else. Therefore, it is understandable for a CEO to pursue personal incentives. However, fiduciary responsibilities to shareholders must be reinforced by boards. It is human nature to prioritize personal needs, but it is unethical to harm the business or shareholders during the process. Therefore, whether or not golden parachutes should or should not be mandatory remains a moral dilemma. The question still stands; is it defendable that CEOs deserve and have rights to collect golden parachutes? In a current issue, Rick Wagoner, CEO of GM, was asked to resign by Obama due to his failure to submit a restructuring plan. As a result, he received a whopping golden parachute of $20 million. If the decision was put in the hands of many tax payers, he would not have left with $20 million due to his track record. According to ABC News, under his leadership, â€Å"GM lost tens of billions of dollars, took billions in taxpayer-financed aid, and cut tens of thousands of jobs, including announced plans to cut 47,000 employees by the end of 2009†. (2) On top of that, he was included in a scandal, late 2008, where he was witnessed to have flown private jets when asking for a government bailout. With such exposure, tax payers are petrified with the fact that their money is going towards a paying a company which failed restructure. Thus, many argue that he did not deserve the money since he neglected his responsibility as the CEO of GM to look in the best interest of the stakeholder. On the other hand, GM and the government had to, by law, give Rick Wagoner the pay since it was already negotiated; thus, he was entitled to retirement funds. As a result, another ethical issue may arise based on whether or not he deserves the pay. Let’s also not forget the fact that he worked in GM for 32 years. 2) On top of that, if a golden parachute was not offered, many capable CEOs will lose incentives and GM’s financial position may not be able to recuperate without an effective leader. In essence, the dilemma a remains in debate regarding whether or not the benefits of golden parachutes override the possible abuse of this privilege. To further analyze this case, this dilemma was applied to the seven step decision procedure. Moral Standards To start off with, the first step to the decision procedure is to identify moral standards. Since each stakeholder’s interests vary, there is a conflict among personal goals, beliefs and values. For instance, CEOs and board members take action to maximize their pay due to personal goals; however, it may not be in the best interest of the company. As a result, by pursuing this goal, CEOs and board members believe in egoism where they look solely in the best interest of themselves and consider it as a means to goodness. They also believe that with a capitalist economy, the government should not intervene and should grant businesses’ their freedom resulting a laissez-faire perspective. Similarly, shareholders also intend to maximize their income and personal incentives. In doing so, they value trust and honesty and expect fiduciary duties to be met. Moral Impacts The second step is to recognize all moral impacts and how they either benefit or harm stakeholders. It is also important to identify any rights that are linked to entitlement and/or duty that may be recognized or violated. The following chart is a cost/ benefit analysis if the government was to allow the practice of golden parachutes.

World War I2 essays

World War I2 essays Who started World War I? According to the treaty of Versailles Germany and their allies started the war (document 4)(see fig 1.0). In this essay I will tell you why I think that all of Europe is responsible for the outbreak of World War I. In the essay I will use 6 of the 7 documents in the document-based question and use some outside sources to prove my theories. Nationalism was on reason why World War I started. Nationalism is a strong feeling of loyalty to ones own country (Childcraft dictionary). Nationalism was strong in Europe but it was especially strong in France and Germany. Germany was proud of their economic and military strength wile France was one of Europes leading powers (wh p.694). While nationalism was strong in those two countries they were having a bitter rivalry. The French were still mad at their defeat in the Franco-Prussian war in 1871 because their leader Napoleon III was overthrown had they had to accept harsh peace with Germany. The peace treaty said that they (France) had to surrender their provinces of Alsace and Lorraine (see fig. 2.0) and pay a huge sum of money to Germany (wh p.617). At the same time in Austria-Hungary they feared nationalism because they worried that Serbia would rebel and be in a different country. Meanwhile Russia had a powerful form of nationalism called Pan-Slavism, which stated that all Slavic people shared a common nationality (ce). So Russia as the largest Slavic country stood ready to defend Serbia (wh p.695). In the Ottoman empire they feared Serbia and Russia because Serbia was aggressive and they also dreamed of having their own south slave state (wh p.695), and Russia over the past years was decreasing the ottoman empires borders by invading them and they wanted revenge for that (ce). Another factor that helped cause World War I was the economic and imperial rivalries (document 5). ...

Emphysema essays

Emphysema essays Emphysema or COPD, chronic obstruction pulmonary disease, is the destruction of the alveoli in the lungs where the gas transfer takes place. The bronchioles distribute the air throughout the lung to the individual alveoli. Once damaged, the bronchioles tend to collapse, trapping stale air in the isolated sacs and no longer transmitting fresh air. As the alveoli are destroyed, more and more air is required to provide a sufficient amount of oxygen. This need for more air eventually leads to lung overinflation. The lungs gradually enlarge, completely filling the chest cavity and causing a sense of shortness of breath, one of the most common symptoms. The other most common symptom is coughing. Other symptoms may include insomnia, weight loss, memory loss, morning headaches, blurred vision, chronic fatigue, impaired concentration, and swelling of feet and ankles. More than 80% of all emphysema is directly related to smoking. Tars, smoke, and toxic chemicals added by tobacco compa nies, combine to block the production of apha-1-antitrypsin (AAT), leading to the destruction of the elastic fibers of the alveoli. There is also a genetic form of emphysema not related to smoking. It is due to an AAT defiency that leads to A1AP-related emphysema. The liver produces insufficient AAT to control an enzyme known as neutrophil-elastase. Though this enzyme plays an important role in fighting bacteria and cleaning up dead lung tissue, it eventually causes irreversible damage to the alveoli by damaging their elastic fibers. Diagnosis may involve a chest x-ray or a series of other respiratory tests. Sometimes the doctor may tap on the chest while listening with a stethoscope; it will result in a hollow sound because of the destroyed alveoli. The goal of treatment is to provide relief of symptoms and prevent progression. Advice from the doctor may include, quitting smoking, bronchodilator drugs which relax and open air passages in ...

Separation of Complex Cations of Chromium(III) by Ion Exchange Essay - 1

Separation of Complex Cations of Chromium(III) by Ion Exchange Chromatography - Essay Example The relative amount of divinyl-benzene affects the physical properties and solubility of the resins. 9. After the solution is drained to the resin level, the column is washed with HCIO4 until the un-reacted [CrCl2 (H2O) 4] has been eluted to approximately 5 cm3 of the intensely colored fraction and the UV visible spectrum measured. Chromium (III) is the simplest ion that chromium forms in solution. Chromium (III) prefers to form octahedral complexes whose color is determined by the ligands attached to the chromium center. It forms different complexes under different conditions. . Regarding the ion exchange process for Chromium (III), the ion exchange resins used is SO3H group. Aqueous solutions of the complexes trans‑[CrCl2(H2O)4] Cl, [CrCl(H2O)5]Cl2 and [Cr(H2O)6]Cl3 will be isolated in a pure state based on their different affinities for a cationic exchange resin. Only a single beam of UV-VIs is used to determine 10 Dq. They have â€Å"the  ligand field  splitting energy† which helps to determine this easily and quickly. This is because there is no d-d electron transition as the d orbitals are completely filled and UV-VIs bands are not observed (Pantsar-Kallio 1997).   As a result, two bands are observed in the region 350 to 750 nm. This band energy is used to identify and characterize complex ions. The peak tells us that how much energy is absorbed at each wavelength of the UV. The longest wavelength band (distance between two adjacent peaks on graph) of the two has energy approximately equal to 10Dq for the complex ion. The relative crystal field strength of H2O is high than Cl because Cl ligand has a weak field ligand and determines a smaller value of 10 Dq while [Cr (H2O) 6]3+ has the highest 10Dq because there is no Cl ligand in it only H2O is present which is a strong field ligand and determines a higher value of 10 Dq. From the above experiment we may conclude that in the ion exchange method of

Globalization Essay Example | Topics and Well Written Essays - 1750 words - 1

Globalization - Essay Example Globalization is at times controversial with the amount of criticisms being almost at par with its merits. However, supporters of each side of the argument have valid reasons to justify their stand (Held et al. 2005). The following discussion analyses the key aspects of the sceptics approach and the reformist approach to globalization. The sceptics approach The sceptics approach is in opposition to making general claims concerning the totalizing effect of globalization. Held and McGrew (2003) argue that current global market is more regionalized. Sceptics argue that the height of globalization took place in the nineteenth century and current developments confirm a considerable level of regionalization. It can be noted that the degree of trade as a fraction of national earnings was higher before the World War I than it is currently (Hirst and Thomson 1999). Sceptics claim that international trade and FDI operations are mostly practised in Europe, North America and Asia. Therefore, wha t is referred to as globalization is actually regionalization (Murray 2006). The emerging economies are becoming increasingly marginalized as they are not drawn in the world economy (Jones 2010). Other perspectives put emphasis on the growth of global capitalism. However, the sceptics view international capitalism as a falsehood. Multinationals are important components of globalization but their benefits are mainly reaped by their countries and hence do not profit the regions in which they operate. The idea of growth of global governance is questionable and sceptics argue that it is only a hidden neo-liberal ploy to benefit the West (Oxfam, 2002). Most of the assumptions by the reformist approach have been rejected by the sceptics who claim that globalization is a disguise of regionalization in the world. They state that the global economy is divided into three regional alliances in which national governments remain dominant (Held and McGrew 2002). Sceptics support their arguments b y conducting experimental testing of the strong globalization theory. This is achieved by applying two methodological models. The primary approach is founded on constructing conceptual models of the global economy and culture and identifying the extent to which trends in the contemporary world match the ideal standards. Hirst and Thomson (1999) used the same method of analysing the theory and formulated two ideal forms which are authentically global economy and international economy whereby there exists a thin line between them. Sceptics argue that globalization should represent the expansion of fresh economic organizations not just theoretical developments towards increased global trade and investments (Hirst and Thomson 1999). Sceptics continue to argue that globalization has lost its meaning. This is due to the fact that most countries are left out of global progression which applies to the Middle East, Africa, parts of Asia and Latin America. This further expounds on the claim t hat what exists today is simply regionalization. The other important approach compares the trends in the past with current trends. By comparing the modern trends and those in the past, sceptics have reached a conclusion that the point of the current internalization is not traditionally unmatched (Hirst and Thomson 1999). This can be attributed to migration in the nineteenth century. The ratios of trade liberalization have increases over time and though the total