The Amazing Rubidium Essay Example

The Amazing Rubidium Essay To start off this amazing element has just a little bit of history to it. At first when I heard about this element I thought it was some type of gas but it can turn it to a liquid at a certain type of liquid. But is actually a very shiny type of metal. Rubidium was discovered by Kirchoff and Bunsen in 1861 through the use of a spectroscope. Rubidium metal can be made by minimizing rubidium chloride with calcium with other substances. The cost of this metal in small quantities is approximately 25 U. S. dollars a gram. This element is obtained in the earths crust which is very useful to people. It is the sixteenth most abundant element in the earth crusts which is very common. The exact atomic mass of Rubidium is 85. 4678. The color of this element is a silvery white. The odor of this element smells like a dense type of liquid metal. Rubidium can be both a liquid and a solid at room temperature. It reacts violently with potassium and caesium. This reaction is so strong that it is possible that usually it could light on fire to a yellowish color. Rubidium acts violently with many things like gold, cesium, sodium, and potassium. The density at room temperature of rubidium is exactly 1. 32g cm -3 and the density of rubidium at its liquid state is 1. 46g cm -3. The melting point of this element is 312. 46 K, 39. 31 C Â °, and 102. 76 Â ° F and the boiling point is 961 K, 688C Â °, and? 1270 Â ° F to be exact. Rubidium for me is a type of element that is very dramatic because it reacts with many other elements and is a good conductor of electricity which can generate an elec trical current. Rubidium can conduct electricity because its ions forms heat at a high temperature and goes through a magnetic field and therefore it is a good conductor of electricity. We will write a custom essay sample on The Amazing Rubidium specifically for you for only $16.38 $13.9/page Order now We will write a custom essay sample on The Amazing Rubidium specifically for you FOR ONLY $16.38 $13.9/page Hire Writer We will write a custom essay sample on The Amazing Rubidium specifically for you FOR ONLY $16.38 $13.9/page Hire Writer The things that I think that’s interesting about rubidium are that it is used in vacuum tubes as a material that combines with and carries away gases from vacuum tubes. It is also used in the manufacture of photocells and in special types of glasses. Rubidium can be used as a propellant in ion engines on spacecraft which is awesome. Also, rubidium is used with CO2 which is used in very powerful types of guns. I was using rubidium all of this time and I didn’t even know. Another interesting thing about rubidium is that it was discovered by accident. While the German chemists Robert Bunsen and Gustav Kirchoff were analyzing amples of lepidolite with the spectroscope. Rubidium is such a good conductor of electricity that the electricity can travel at the speed of sound which is approximately 1300 meters a second. Rubidium reacts with many elements like mercury, gold, cesium, sodium, and potassium. Surprisingly rubidium can ignite if it comes in contact with air which will turn a yellowish color when ignited. Due to this it must always be kept inside things like dry mineral oil or in a vacuum. Rubidium is very flammable and can ignite with many things like air or hydrogen and it is not explosive. Rubidium is very poisonous and can possibly kill someone. If rubidium touches the heart it will immediately due to its poison. Rubidium is less poisonous then potassium though. It can affect the human by killing them or possibly sending them to the hospital. Rubidium is only dangerous to the environment when it comes in contact with air and other chemicals. Rubidium has many uses. It is a very good conductor of electricity; it is used to locate brain tumors, because of its slight radioactivity which is pretty cool. It is a working fluid in vacuum tubes. This element is used in atomic clocks because of its hyperfine structure energy levels. It can also be used as an ingredient in several special types of glass and a photocell component. Rubidium is has the highest room temperature conductivity of any ionic crystal. It is also used for film batteries and has the same conductivity of sulfuric acid at 20 Celsius. Rubidium’s vapor is use to make atomic magnetometers. Rb is currently being used, with other alkali metals, in the making of spin-exchange relaxation-free magnetometers. Rubidium chloride is most likely the most-used compound in biochemistry to induce cells to take up DNA. Rubidium cannot possibly be recycled.

Planted History essays

Planted History essays There would be no environmental history without a human context. Californias Yosemite Valley has an organic and geological history written in its plants and rock formations and a silent history that took place on the tails of Manifest Destiny , where the landscape was merely a setting for a human plot that is largely excluded from institutional memory today. The subjective telling of Yosemites past through both text and image maps the American consciousness of a celebrated national park. By drawing from Rebecca Solnits Water, or Forgetting the Past: Yosemite National Park, The Wild Parks and Forest Reservations of the West by John Muir, and several period artistic interpretations of the area one can conclude that the idealized landscape of Yosemite is made not only of natural formations but cultural constructions of the past that carry into present day. In Water, or Forgetting the Past: Yosemite National Park Rebecca Solnit attempts to measure the cultural impact of a nature reserve whose violent human history was, and remains, dominated by omissive media. The laws that protect Yosemite National Park elevate it to a status above commonplace earth. As Victorians mixed their taste for scenery with piety and sought hard for traces of a God (256) Yosemite carved a spiritual niche for itself and became a standard by which other nature could be measured. During this time the language used for describing art, landscapes and spirituality overlapped, nature meant not only the material and observable world but the natural state of man in contrast to a state of grace. The park was signed into existence by Abraham Lincoln during the Civil War. Yosemite was created at a time in American history burdened with discord and on the heels of an artistic and intellectual movement known as romanticism. Yosemite became a vehicle for American pride and patriotism, embodying not only...

Ursula burns Essay Example | Topics and Well Written Essays - 1500 words

Ursula burns - Essay Example At a young age, Burns exhibited unequaled interest and capability in mathematics thus prompting her to like mathematics throughout her learning years (West Hartford). Burns’ mother acted as an immense inspiration for being able to cater for own three children single handedly thus giving her inner strength as well as courage. All through her life, almost each thing seemed extremely hard including utter deterrent from people who constantly told her how unlucky she was because been black, underprivileged and more so of being a woman. However, Burns’ mother tried to equivocate all those discouragements get into her and constantly reminded own daughter that, where she was will not in anyway delineate her future (â€Å"Embassy of the United States of America†). Back then, she anticipated of embracing nursing career, nun or if not those a teacher. Since, all these aspirations descended from the influence of their teachers in catholic schools where she schooled while undertaking high school studies. Conversely, not all the three options did prompt her feel contented as her ambition was to become an engineer, hence defying careers that her tutors were advising her to undertake (â€Å"Lean In†). Nursing this dream and actualizing it did not seem that easy but due to constant encouragements especially from the mother as well as her high school, Cathedral High School she eventually managed (Robertson 3). Due to her proficiency in mathematics, she ended up schooling in Polytechnic Institute of new York University (Smith 1903). Here she chose a career path, which majority of the students was men and mostly the whites thus joining few females dared to pursue engineering. Initially, she opted to undertake chemical engineering but eventually changing to mechanical engineering for she thought it suited her more than the former. After her Bachelor of Science degree in engineering, she proceeded to Columbia University for a graduate program (Smith

World war I Assignment Example | Topics and Well Written Essays - 250 words

World war I - Assignment Example Women have played their role equally in the war as compared to men. In the poetic thought Jessie Pope has shown the woman as brave and gallant and she has dealt with the delicacies of war in a more professional way and she has proved as a star in filling the minds of young men with loyalty and patriotism. She has expressed in her poem â€Å"The Call† that trenches are very horrible place and she is actually provoking the men that it is the duty of men and it’s not the duty of women that they have to face the horrible situations. So there is a concept that women are not too much powerful like men so it’s the duty of men that they must have to face the difficulties of war. Actually in the very poem she is longing that the men must lift their level of bravery and they have to face the war in a braver manner because the military uniform is not for the women rather it more suits to men. It is the duty of men that they look sober in shouting and shooting while women ar e not born for such deeds. So from the very idea of the poem â€Å"The Call† by Jessie Pope it is evident that war is a more suitable topic for poetry because it has a number of aspects which can be expressed in a poem in a more powerful

A National PE Curriculum Model or a Program Framework Research Paper

A National PE Curriculum Model or a Program Framework - Research Paper Example SEPEP is distinguished from any other physical education programs mainly by its focus on the staging of a sports tournament. Throughout the program, the students organize and manage the sporting competition. It is expected that they would learn about sports effectively at the same time gain practical and theoretical insights with respect to the roles and dynamics of sports in real life. In this vein, one also recalls the main characteristic and goal of the authentic model, which is to teach sports by creating an authentic setting and experience for learners. Particularly, there is an emphasis on the diversity of roles. The authentic model makes sure that students do not merely participate as players but also take the role of referee, scorekeepers, record takers, performance reporters, coach and team managers. The main difference, however, is that the SEPEP framework is broader for the students with the added responsibility of having to organize the sporting event itself. This is part icularly important especially when one takes into account a recognized theory that, in order for physical education to be effective – that it exerts a meaningful impact to the students’ life - it must be taught within the social context as enacted in the community (Burrows, Macdonald & Wright, p. 64). The idea is that students are in a better position to learn concepts such as teamwork, fitness and fair play, among others. The SEPEP as teaching framework is an interesting model. It entails a different approach with respect to the teacher and the students; roles.

Theories of Cultural Criminology

Theories of Cultural Criminology Contemporary Issues in Criminology:  Cultural Criminology Critically discuss its theoretical underpinnings and evaluate whether this theoretical approach serves as a useful explanation of criminal behavior in modern Britain. Cultural criminology is the approach to the investigation of crime that its criminality and its control are based in the context of culture. This means, that institutions of crime control, and crime by it self are seen as products of culture. Cultural criminology’s study is approached with theories, methods, and political analysis. There are two key elements that interact, and cultural criminology wants to pay its attention on this interaction which is between: the ascending and descending of the connection of constructions. It always focuses upon the adjoining generation of meaning around this interaction such as: making and breaking of the rules of law, innovation and infringement in politics. (www.culturalcriminology.org) Particularly, cultural criminology is an observation performed by Ferrell Sanders (1995), and implemented by Redhead (1995) and others and linked specific academic threads to discover the meeting of cultural and criminal procedures in current social life. (Kane 1998) In modern society the crime practice and crime control, with cultural dynamics, are connected and cultural criminology discovers the various ways in which they connect. In other words, what cultural criminology supports, is the idea that the centrality of meaning and representation in the structure of crime as a temporary fact. From this point of view, the traditional ideas of crime and crime awareness to add pictures of illegal behavior and symbolic appearances of law reinforcement, famous culture structures of crime and criminal behavior. Scholars are allowed from this big interest and concentration on culture, and people have better understanding of crime, as remarkable activity, and also comprehends the politics that contest for criminal control. (www.culturalcriminology.org) Cultural criminology unites at a very high level, the clear-sight of sociological criminology with the orientations toward picture and design, which is given by the cultural studies area. Cultural criminology has appeared from a much more mixed co-process of criminology, sociology and of course cultural analysis and this is because of the wide contribution of criminology and culture combined. This appearance was the basic track for the well educated people who worked in association with the Birmingham School of Cultural studies, the National Deviancy Conference, and in Great Britain with the ‘new criminology’ in the 1970s. (www.culturalcriminology.org) After reviewing the kind of modern power, the academics studied the extensions of social level that had to do with culture and ideology. Forbidden subcultures but also easy-going countries (that have another meaning of life), have been observed by those academics. After the observation, they examined what came in between these two different ideologies who guide lawful control and social inspection. (www.culturalcriminology.org) Any regulation that is living and affluent is a topic to ordinary processes of regeneration and refreshment. Criminology is the alike. It has had its humanist Marxist, feminist, and rationalist, between other reappearances and is presently being delighted to one more ‘paradigm shift’ in the shape of a self-styled ‘cultural criminology’. A current unique issue is Theoretical Criminology (2004), which was dedicated to the appearance and predictions of this new kid on the rational block. According to Hayward and Young’s (2004:259) opening essay of the particular topic, cultural criminology is: ‘the placing of crime and its control in the background of culture; that is, observing both crime and the organization of control as cultural products –as inspired creations. (O’Brien 2005, p. 599) The main area that new criminology examines most, is how actors derive meaning, and also looks on how to use the analysis of the examination they are focusing on, to find what leads to breaching the law as every day routine. (ibid.: 260, 266). Understanding its mental heritage in 1960s radicalism and by noticing and observing the strange and not well known subcultures upon that radicalism as more of criminological work, the argument pays attention to its humane certifications and oppositional political motions. â€Å"Indeed, cultural criminology describes it self as, and delights in, working ‘at the margins of ‘mainstream’ criminology, for two reasons, first, because ‘it is here, in these forgotten spaces that the story of crime so often unfolds, and secondly because mainstream criminology is dominated by ‘administrative rationalization and statistical complexity†. (O’Brien 2005, Ferrell 1999 p. 599) Whether a new mental try does not actually stands for what cultural criminology really is, instead of a logical process of past work on different subcultures is still in question, and it is worth it if is a category it self and given a suitable historical reflection. (O’Brien 2005, p. 599) Usually, criminal behavior means sub cultural behavior. Individuals and activities which are known as criminals are formally produced by the limits of different and criminal subcultures. Criminologists have accredited this from the interactionist criminology of the Chicago School and Edwin Sutherland to the sub cultural theories of Cohen, Cloward and Ohlin. (Ferrell, 1995 p.26) Either if it is carried out by a group of people, or just by one person, specific criminal acts are usually set up within incited by sub cultural. Even though the boundaries may still have an inaccurate definition, and the membership may increase in numbers as well as the level of commitment, these subcultures include final human relationships for those who take part in them. â€Å"Biker, hustler, Blood and Crip, all name sub cultural networks as much as individual personalities.†(Ferrell, 1995 p.26) As Sutherland and the Chicago School knew from fifty years ago , and while immeasurable case studies have been certified, criminal subcultures merge not only proximities of personal relationship. To be able to discuss about criminal subculture, the ability to accredit a group of people and a truss of symbols, meaning and education is required. Members of criminal subcultures always adapt and discuss ‘motives, drives, rationalizations, and attitudes’, they perform a different kind of language, look/style, personality and they take part at a larger or smaller level, in a subculture, a way of life which they chose.(Ferrell, 1995 p.26) The sub cultural meaning mostly action, personality, and status is organized around the style which the subculture’s member decide to have. Delicacies of chosen style, defines what crime means, and difference for sub cultural members, agents of legal control, consumers of intercede crime pictures and other people. We must be clever enough to understand the criminal acts and chosen aesthetics they have for their selves. (Ferrell, 1995 p.26-27) â€Å"Katzs research, for example, has linked criminal acts and aesthetics by examining the styles and symbolic meanings which emerge inside the everyday dynamics of criminal events and criminal subcultures. By paying attention to dark sunglasses and white undershirts, to precise styles of walking, talking, and otherwise presenting ones criminal identity, Katz has sketched the alternative deviant culture, the coherent deviant ‘a’esthetic in which badasses, cholos, punks, youth gang members, and others participate. In these cases, as in other forms of crime on and off the street, the meaning of criminality is anchored in the style of its collective practice. The bikers ritually reconstructed motorcycle, the gang members sports clothing and tattoos, the graffiti writers mysterious street images, and the skinheads violently provocative music constitute the essential cultural and sub cultural materials out of which criminal projects and criminal identities are constructed and displayed. Once again, participation in a criminal subculture, or in the culture of crime, means participation in the symbolism and style, the collective aesthetic environment, of criminality.† (Ferrell, 1995 p.27) A recent study by the British cultural studies tradition to Katz and other new criminologists has concluded that style and symbolism not only bind with the wide social and lawful relations in which these subcultures are caught. Criminal subcultures and their styles accelerate out of school, age, ethnicity, gender and legal inequalities repeat and resist these social wrong lines. This interaction of sub cultural style, inequality and power in turn, reminds of Becker’s classic criminological thoughtless that we have to investigate, criminal subcultures and also legal and political powers who built these subcultures as criminal. After we do the study, we see that these powers (authorities) both opposing to sub cultural styles, and themselves, putting symbolic and stylish strategies of their own against them. The criminalization attempts of legal and political supporters show again the control of cultural forces. In criminalizing cultural and sub cultural actions, and demonstrating for public support, ethical capitalists and legal authorities influence legal and political structures, but possibly more, so structures of mass symbolism and perception. (Ferrell, 1995 p.27, 28) To seize the real meaning of criminalization and crime, cultural criminology should count the powers of criminal subcultures as well as for the powers of mass media. Nowadays, intervene pictures of crime and criminal abuse, is harming as slowly-slowly and by doing that, helps the public to draw opinions and policies that have to do with crime. But obviously these modern cases construct on latest interceded constructions of crime and its control. In the United States, criminalization of marijuana fifty years ago was based on a try to wake people up to see the danger and face it, as unambiguously defective symbol in Los Angeles newspapers. (Ferrell, 1995 p.28) â€Å"In the mid-1960s, shocking media reports of rape and assault placed the circumstance for a permissible campaign in opposition to the Hells Angels; and at approximately the matching time, lawful harassments on British mods and rockers were lawful throughout the medias consumption of sensitive symbols.† In the 1970s, the mutual relations amid the British mass media and criminal justice system formed a discernment that mugging was a terrifying new injures of crime. And throughout the 1980s and untimely 1990s, mediated horror legends justified wars on drugs, gangs, and graffiti in the United States, and shaped instants of mediated moral panic over child cruelty and child pornography in Great Britain.† (Ferrell, 1995 p.28) This concentration on cultural dynamics, the composition of deviant intellectual opinions, the motion behind obedient frontiers, show the probabilities for a reviewable cultural criminology and a kind of postmodern cultural criminology too. Contemporary public, feminist and cultural theories are increasingly moving behind obedient limitations and divide categories to build synthetic, postmodern expectations on cultural and social life. Although grated by their eclectic and divergent parts, these opinions use some same general ideas, between them, the perception that the everyday culture of people and the everyday culture of people and teams merges strong and clashing separations of style and meaning. (Ferrell, 1995 p.36) â€Å"The symbolism and style of social interaction, the culture of everyday life in this way forms a contested political terrain, embodying patterns of inequality, power, and privilege. And these patterns are in turn intertwined with larger structures of mediated information and entertainment, cultural production and consumption, and legal and political authority. As the sort of cultural criminology outlined here develops, it can integrate criminology into these synthetic lines of situated inquiry now emerging under broad headings like postmodernism and cultural studies.† (Ferrell, 1995 p.28) Although grated but their electric and divergent parts, these opinions use some sane general ideas, between them, the perception that the everyday culture of people and teams merges strong and clashing separations of style and meaning. Consequently cultural criminology gives the chance to criminologists, to reinforce their own thoughts and beliefs on crime with perceptive from different areas, but providing at the same time for their colleagues in the studies of culture, sociology of culture, studies on media, and wherever they can adopt their thoughts from, criminalization, and their connection to political and cultural procedures. Folding or breaching the motions of criminology in order to build a cultural criminology, undercuts modern criminology, not more that it extends and vitalizes it. Cultural criminology extends criminology’s sectors contain words conventionally considered external to it like: popular music, style, media operations and texts, and gallery act. Likely, criminology is introduced in contemporary discourses with these worlds and gives a termination of criminological perspectives are very important to them. Crime and culture’s relation, and the wider relation among criminology and modern social, cultural life, are both of them enlighten within cultural criminology. (Ferrell, 1995 p.36-37) References: Ferrell, J. (1995) Culture, Crime, and Cultural Criminology [on-line]. Journal of Criminal Justice and Popular Culture. Available from: http://www.albany.edu/scj/jcjpc/vol3is2/culture.html [Accessed 1 March 2008] O’ Briem, M. (2005) what is cultural about cultural criminology? British Journal Criminology, [On-line] Available from: URL: E:UniModulesWhat is Cultural about Cultural Criminology O’Brien 45 (5) 599 British Journal of Criminology.htm [1 [Accessed 2 March 2008]. Ferrell, J. Cultural criminology. Blackwell Encyclopedia of Sociology [on-line]. Available from: -http://www.culturalcriminology.org/papers/cult-crim-blackwell-ency-soc.pdf

Essay --

The Estate Tax, known as the ‘death tax’ as well as the ‘anti-birth tax’, has been one of the most controversial parts of the United States tax code since its introduction in 1916 (Cagetti & De Nardi, 85). The estate tax is a tax imposed upon assets transferred at the time of the estate holder’s death. Those opposed have named it the â€Å"death tax† as they claim it hurts business activity as well as job creation. However, according to those in favor, the estate tax is an effective way to tax the richest few, and redistribute their wealth, thereby narrowing the gap of inequality. For those in favor, an abolition of the estate tax would impose a â€Å"birth tax† of sorts onto the majority of Americans who have not inherited a large sum of money (Cagetti & De Nardi, 87). The controversial estate tax in the United States is often questioned by many and has been challenged time and time again. However, more emphasis has typically been put o n particular aspects of the tax code where points of dispute are found. In order to fully understand the positions taken by those in favor of the estate tax, and those opposed, it is important to analyze the generality of the tax, as well as the details within it that have been contended over time. Some of the main aspects of the estate tax are taxability, deductions, and exemptions. These aspects are of importance in the context of the ongoing debate, as they most directly educate the tax to those transferring their estate at the time of death. Taxable ‘estate’ assets include those passed along through a will, for example (transfer of property), or the payments or insurances disbursed to beneficiaries of the deceased (IRS, Estate Tax). The IRS considers the transferred assets that are federally taxable t... ... decedent chose to do with their assets. Finally, the very existence of the estate tax puts a significant strain on the overall economy placing undue burdens not only on the rich or on family business, but also those who would be positively affected by the undistorted efforts of those individuals subjected to the tax (Hasset). The federal estate tax, coupled with the local state estate tax have very discouraging and negative effects on not only those taxed, by those that are not (Ebeling). Estate taxation is a highly controversial issue in the United states tax code, and has been appropriately debated from before and since its introduction in 1916. Wether its existence be referred to as the â€Å"death tax†, or its absence as the â€Å"birth tax†, those for and those against have long argued its fundamental validity and appropriateness, its effectiveness, and its contents.

Idealistic vs. materialistic motivation Essay

Both the Americans and the British fought in a more open order with more significant gaps than was the norm in Europe because the general absence of cavalry made the infantry less vulnerable to attack, while the enclosed nature of much of the terrain encouraged deployments that reflected the topography. Heavily-encumbered regular units, maneuvering and fighting in their accustomed formations, were vulnerable in the face of entrenched positions and unsuited to the heavily wooded and hilly terrain of the Canadian frontier; they were also not ideal for the vast expanses of the South. Artillery and fortifications played a smaller role than in conflict in Western Europe. Compared to the armies of Frederick the Great, both the American s and their opponents were lightly gunned. The Americans did not inherit a significant artillery park, while, for both sides, the distances of America and the nature of communications discouraged a reliance on cannon; they were relatively slow to move. As a result, although cannon played a role in battles such as Monmouth Court House, battles were not characterized by the efficient exchanges of concentrated and sustained artillery fire seen in Europe. This benefited the Americans as the British had greater access to artillery, and had used it with considerable success in European campaigns in the Seven Year’s War (French and Indian War). The motivation was more materialistic. We were actually able to unify and motivate these groups even through their separate motivators were so different. But they weren’t mutually exclusive. Today in the United States, we have two kinds of motivators going on at an indigenous level: one is a unification of the population against terrorism, and the other is the preservation of the â€Å"American way. † What we’re trying to motivate ourselves to do – as the nation focuses on the preservation of the American way – is to preserve democracy and the free enterprise system. This two-rack motivator encompasses the right to be free from fear on a daily basis and the right not to have your property destroyed by an enemy force. References: Black, J. (2002). America As a Military Power: From the American Revolution to the Civil War. New York: Praeger/Greenwood.

The Chemistry of Baking Cookies

The Chemistry of Baking Cookies Baking cookies seems simple, especially if you cook pre-made cookie dough, but its really a set of chemical reactions. If your cookies never turn out perfect, understanding their chemistry may help improve your technique. Follow this classic chocolate chip cookie recipe and learn about the ingredients and the reactions that occur throughout the mixing and baking process. Chocolate Chip Cookie Recipe 3/4 cup granulated sugar (sucrose, C12H22O11)3/4 cup brown sugar (caramelized sucrose)1 cup unsalted butter (a fat)1 large egg (consists of water, protein, fat, emulsifier, and albumin)1 teaspoon vanilla extract (for flavor)2-1/4 cups all-purpose flour (contains gluten)1 teaspoon baking soda (sodium bicarbonate,  NaHCO3, which is a weak base)1/2 teaspoon salt (NaCl)2 cups semi-sweet chocolate chips Youll get the best results if you use room temperature eggs and butter. This helps the ingredients mix into the recipe more evenly and means your cookie dough will be room temperature and not cool when you put the cookies in the oven. The fat in the recipe affects the texture of the cookies and browns them, which influences flavor as well as color. Substituting a different fat in place of butter affects the flavor of the cookies and also the texture since other fats (lard, vegetable oil, margarine, etc.) have a different melting point from butter. If you use salted butter, its usually best to reduce the amount of added salt.Preheat oven to 375 degrees Fahrenheit. Its important to preheat the oven because if you put the cookies in the oven and the temperature is too low, the dough can spread rather than firm up. This affects the thickness of the cookie, its texture, and how evenly it browns.Mix together the sugar, brown sugar, butter, vanilla, and eggs. Mostly, this is to blend the in gredients so the composition of the cookies will be uniform. For the most part, no chemical reaction occurs at this point. Mixing the sugars with the eggs dissolves some of the sugar in the water from the eggs, so the crystals wont be as large in the cookies. Brown sugar adds caramelized sugar flavor to the cookies. While it doesnt matter what color of eggs you use (white or brown), the size matters, just like measuring all of the other ingredients! If you substitute an egg from a different bird than a chicken, the recipe will work, but the flavor will be different. You dont want to over-mix the ingredients because beating eggs for too long affects the protein molecules in the egg white. Real vanilla and imitation vanilla (vanillin) contain the same flavor molecule, but real vanilla extract has a more complex flavor because of other molecules from the plant. Mix in the flour (a little at a time), baking soda, and salt. You can sift the ingredients together to make sure they are evenly distributed, but sprinkling the salt and baking soda onto the mixture works too. The flour contains gluten, the protein that holds the cookies together, makes them a bit chewy and gives them their substance. Cake flour, bread flour, and self-rising flour could be substituted for all-purpose flour in a pinch, but arent ideal. The cake flour might produce fragile cookies with a finer crumb; the bread flour contains more gluten and could make the cookies tough or too chewy, and the self-rising flour already contains leavening agents that would make the cookies rise.  The baking soda is the ingredient that makes cookies rise. The salt is a flavoring, but also controls the rising of the cookies.Stir in the chocolate chips. This last to ensure the other ingredients are properly mixed and to avoid smashing the chips. The chocolate chips are flavoring. Dont like semi-sweet? Switch it out! Drop rounded teaspoons of the dough about two inches apart on an ungreased cookie sheet. The size of the cookies matters! If you make the cookies too big or put them too close together, the interior of the cookie isnt dont by the time the bottom and edges brown. If the cookies are too small, they may not brown enough by the time the middle is done, giving you rock-hard cookies. Theres no need to grease the cookie sheet. While a light spritz of non-stick spray might not hurt, greasing the pan  adds fat to the cookies and affects how they brown and their texture.Bake the cookies 8 to 10 minutes or until they are light golden brown. Which rack you put the cookies on depends on your oven. Usually, the center rack is fine, but if your cookies tend to get too dark on the bottom, try moving them up one rack. The heating element in a conventional oven is on the bottom. The Baking Process If the ingredients are high quality, measured carefully, and mixed as they should be, chemical magic happens in the oven to make great cookies. Heating sodium bicarbonate causes it to decompose into water and carbon dioxide: 2NaHCO3 → Na2CO3 H2O CO2 Carbon dioxide gas and water vapor form the bubbles which make cookies rise. Rising doesnt just make cookies taller. It also opens up space to keep the cookie from becoming too dense. Salt slows down the decomposition of baking soda, so the bubbles dont get too big. This could lead to weak cookies or to cookies that fall flat when they come out of the oven. The heat works on the butter, egg yolk, and flour to change the shape of the molecules. The gluten in the flour forms a polymer mesh that works with the albumin protein from the egg white and the emulsifier lecithin from the egg yolk to form the dough and support the bubbles. Heat breaks the sucrose into the simple sugars glucose and fructose, giving each cookie a shiny, light brown crust. When you take the cookies out of the oven, the hot water gases in the cookie contract. The chemical changes that occurred during baking help the cookie keep its shape. This is why undercooked cookies (or other baked goods) fall in the center. After Baking If the cookies arent devoured immediately, the chemistry doesnt end with baking. The humidity of the surroundings affects cookies after they have cooled. If the air is very dry, moisture from the cookies escapes, making them hard. In a humid environment, cookies can absorb water vapor, making them soft. After cookies have completely cooled, they can be placed into a cookie jar or other container to keep them fresh and delicious.

Definition of the Term LD50

Definition of the Term LD50 Definition: The median lethal dose of a substance, or the amount required to kill 50% of a given test population. LD50 is a measurement used in toxicology studies to determine the potential impact of toxic substances on different types of organisms. It provides an objective measure to compare and rank the toxicity of substances. The LD50 measurement is usually expressed as the amount of toxin per kilogram or pound of body weight. When comparing LD50 values, a lower value is regarded as more toxic, as it means a smaller amount of the toxin is required to cause death. The LD50 test involves exposing a population of test animals, typically mice, rabbits, guinea pigs, or even larger animals such as dogs, to the toxin in question. The toxins might be introduced orally, through injection, or inhaled. Because this testing kills a large sample of the animals, it is now being phased out in the United States and some other countries in favor of newer, less lethal methods. Pesticide studies involve LD50 testing, usually on rats or mice and on dogs. Insect and spider venoms can also be compared using LD50 measurements, to determine which venoms are the most deadly to a given population of organisms. Â   Examples: LD50 values of insect venom for mice: Honey bee, Apis mellifera - LD50 2.8 mg per kg of body weightYellowjacket, Vespula squamosa - LD50 3.5 mg per kg of body weight Reference: W.L. Meyer. 1996. Most Toxic Insect Venom. Chapter 23 in University of Florida Book of Insect Records, 2001. http://entomology.ifas.ufl.edu/walker/ufbir/.

Analyze a film Essay Example | Topics and Well Written Essays - 500 words

Analyze a film - Essay Example The education has led to the exclusion of the brothers from the rest of society. Moreover, the community is also shown to be united and caring. The unity is seen in contribution for support of Delbert trial(Berlinger and Sinofsky 1). The community also is seen as caring as one of the neighbors agrees to drive Delbert home to know the sate of his brother (Berlinger and Sinofsky 1). The film creates various perceptions on people. As a result, people are described based on that perception. An example of identity scripts is the depiction of brothers as poor. The brothers are shown living in poor housing conditions (Berlinger and Sinofsky 1). The reflected appraisal is seen as people view the brothers as being dirty and hence unable to have girlfriends. On the other hand, the lack of girlfriends make society views the brothers as practicing incest. Social comparison is seen through lives of the community. The brothers are depicted as less fortunate and hence attract ridicule of the community. On the other hand, the other part of community is depicted as being fortunate in life. The definitions affect identities of individuals involved as perception about them is based on their conditions (Berlinger and Sinofsky 1). In the film, there is a view that lack of relationship in all the brothers is an indication they are gay. As a result, the semen found on William is believed to be because of sexual interaction with the brother (Berlinger and Sinofsky 1). The brothers are affected by this generalization as they go through the rigorous process of trial. On the other hand, the community is affected by trial, as it is perceived to have neglected the brothers. There are variations of the perspectives in the documentary. One of the Views is the local community view that the brothers are wrongly accused (Berlinger and Sinofsky 1). On the other hand, the outsiders see the death as resulting from intimacy. The locals base their

In what ways does the newspaper media presentation of young black men Essay

In what ways does the newspaper media presentation of young black men affect the self perception of the young people themselves - Essay Example Similarly, the entertainment media have willingly received their prompt from the members of the press, and these inaccurate representations not merely shape race relations but also generate a self-fulfilling prophecy for young black males, whose limitations of achievement can be fixed for them by presentations in the media (Johnson, Adams, Hall, & Ashburn 1997). A widespread stereotype about young black males is that they take part in substance abuse in uneven numbers. Other widespread detrimental stereotypes portrayed in mass media involve the young black male as a drug addict and criminal; there is also a persistent depiction of the young black male intellectually inadequate (Larson 2005). An individual who carries the dishonour of group membership should be equipped for its incapacitating consequences. Studies suggest that young black males are aware that they are denounced as being cognitively inadequate and that they go to school carrying a ‘burden of suspicion’ (Larson 2005: 42), as it is referred to as by psychologist Claude Steele. Such a burden can influence their achievement, attitudes, and perception of their selves (Larson 2005). Likewise, studies discovered that when college men are admonished that their group is regarded inferior at math, their academic performance may realise this prophecy (Markowitz & Jones-Brow n 2000). These stereotypes stay with stigmatised individuals regardless of their accomplishments or status. They should remain vigilant and put up with an extra burden that may impinge on their self-esteem, ambitions, and performance. These stereotypes have the capability of depriving them of their individuality and weaken their efforts to escape from stigmatised roles (Markowitz & Jones-Brown 2000). Even though Black news journalists and principal characters have been steadily growing in number, the significant majority of decision makers in the media remain