Colloid Examples in Chemistry

Colloid Examples in Chemistry Colloids are uniform mixtures that dont separate or settle out. While colloidal mixtures are generally considered to be homogeneous mixtures, they often display heterogeneous quality when viewed on the microscopic scale. There are two parts to every colloid mixture: the particles and the dispersing medium. The colloid particles are solids or liquids that are suspended in the medium. These particles are larger than molecules, distinguishing a colloid from a solution. However, the particles in a colloid are smaller than those found in a suspension.  In smoke, for examples, solid particles from combustion  are suspended in a gas. Here are several other examples of colloids: Aerosols foginsecticide spraycloudssmokedust Foams whipped creamshaving cream Solid Foams marshmallowsStyrofoam Emulsions milkmayonnaiselotion Gels gelatinbutterjelly Sols inkrubberliquid detergentshampoo Solid Sols pearlgemstonessome colored glasssome alloys How to Tell a Colloid From a Solution or Suspension At first glance, it may seem difficult to distinguish between a colloid, solution, and suspension, since you cant usually tell the size of the particles simply by looking at the mixture. However, there are two easy ways to identify a colloid: Components of a suspension separate over time. Solutions and colloids dont separate.If you shine a beam of light into a colloid, it displays the Tyndall effect, which makes the beam of light visible in the colloid because light is scattered by the particles. An example of the Tyndall effect is the visibility of light from car headlamps through fog. How Colloids Are Formed Colloids usually form one of two ways: Droplets of particles may be dispersed into another medium by spraying, milling, high-speed mixing, or shaking.Small dissolved particles may be condensed into colloidal particles by redox reactions, precipitation, or condensation.

Ufos exist Essays - Ufology, Unidentified Flying Object, Free Essays

Ufos exist Essays - Ufology, Unidentified Flying Object, Free Essays Ufos exist The Existence of UFOs is Real? Was that merely a shooting star streaking across the night sky, or was it a glimpse of some sort of alien aircraft? I believe that we are not the only intelligent life forms that exist in this vast universe, and it is my opinion that the earth has been visited by extraterrestrial beings. Sightings of unusual aerial phenomena date back to ancient times, but only after 1947, have UFOs been widely discussed because of publication worldwide. Moreover, many things support this concept of UFOs existence such as sightings, crop circles, encounters, and abductions. Furthermore, Area 51, which is a top-secret military facility that the government would not discuss about to the public, has been at the center of the UFO existence controversy for many years. The government denies its existence, but how do you explain the 240 or more white Jeep Cherokees patrolling an area that does not exist? This and many other factors are what contribute to the mystique of the highly restricted place called Ar ea 51 and the existence of flying saucers known as UFOs. Although, there is no official data or record about the UFO sighting, according to folk tales, it can be said that people does observed such flying objects since historic times. The first sighting of UFOs is marked since the late 1800 by most of the researchers. Private pilot Kenneth Arnold made the most famous and prominent UFO sighting in the year 1947. In addition, he claimed to observe nine circular objects in the skies over the state of Washington and described these objects like saucers skipping over water. There the term Flying Saucer was born. This event led to the reporting of similar reports in different parts of the world at different times. Moreover, according to a rough estimate, about 60% of such reports are hoax or due to some other reasons. While, some of the objects noticed in the sky were definitely Nguyen 2 astronomical in nature like comets and asteroids. However, some UFOs reporting were also a result of disillusion like clouds. There are certain natural phenomenons that give rise to various hypothetical shapes formation on the astronomical horizons. Most of these halos are also perceived by naked eyes and are called as UFOs by populace. Since 1947 there have been UFO sightings in almost every country sometimes there is something called a UFO wave, which for a short time UFO sighting increases rapidly in one certain area. For instance, UFO waves occurred in Italy in 1954 and in the United States in 1947. Furthermore, nobody can explain anything about these waves and attempts to link them with hysteria, mentality and stress have all failed. However, a good amount of 40% cases are still left to be researched. There are enough evidences that rule out all the possible human errors, psychological aspect and hallucinations. In addition, the reports do claim the presence of extra terrestrial components in the earth's atmosphere on scientific analysis. There are also people that often report the marks that are supposedly left by an alien spaceship at grounds, known as trace case. Such incidents are reported mainly by the inhabitants of remote and rural areas. Furthermore, similar evidence to support the reality of abduction events has been lacking or relatively uncompelling but the physical evidence events such as trace case has been more successful. For instance, a trace case that occurred near Trans-en-Provence, France, on January 8, 1981. The witness was working in his garden when he heard a low whistling sound. Upon turning around, he saw an ovoid object in the sky that approached the terrace at the bottom of the garden an d landed. The witness moved forward cautiously to observe the strange phenomenon but, within a minute, the object rose and moved away in the same direction from which it had arrived. It continued to emit a low whistle. The witness approached the scene of the apparent landing and observed circular depressions, separated by a crown, on the ground. Scientists and researchers are working extensively to mark the presence of life on other planets and their possible intervention in earth's atmosphere. However, no significant milestone has yet been reached by any of the

What insights, if any, can the writings of Michael Foucault provide Outline

What insights, if any, can the writings of Michael Foucault provide for the student of medieval 'outsiders' - Outline Example Perhaps one of the main contributors to the body of knowledge includes Michel Foucault. Indeed, his exploration of science, philosophy, history and a host of other fields generated useful insights that inform current decisions in the academic sphere. It is against this background that this paper underscores contributions of Michel Foucault that are informative to the student of medieval ‘outsider’. Foucault posits that the disappearance of the social problem of leprosy paved way to insanity2. Initially during the 1500s, mad people were secluded from the society and sent away in ‘ship of fools’3. According to Foucault, leprosy was a complex phenomenon whose occurrence was beyond the physical incapacitation6. From a medical point of view, the populations that were affected by it suffered immensely. The then societies feared the disease because of the medical implications that were associated with it. Just like mad people, lepers were secluded form the society The resultant gap made it possible for populations to carry on with the practice of seclusion. Gradually, mad people started being given a similar treatment. In essence, they were considered social outcasts and were exposed to brutal treatment9. Foucault believes that discipline and punishment gives the persons in authority power over an individual who is punished10. Power in this regard is defined by professional knowledge thus judges, parole officers and the police are powerful. The degree and length of the disciplinary measure is depended on the decisions that are made by individuals in power11. These also determine the type of punishment that need to be reflective of the type of wrong that is committed by the prisoner. Discipline and punishment play distinct social and political roles of: Human sexuality has a direct influence on social as well as political power structuring16. The procedures and

Are the united nations peace operations an appropriate tool for Essay

Are the united nations peace operations an appropriate tool for preventing the abuse of human rights during violent internal conflicts - Essay Example What is the meaning of people who are not combatants? which kind of protection is available in times of civil wars?. To answer these questions, it is wise if one understood why United Nations Peace Operations were put into place. The first step towards this is to understand the term peace operations. As such, it is a broad term in regard to its scope. It covers operations associated with peacekeeping as well as operations designed purposely to enforce peace. Such operations are usually conducted such that they support the efforts of the diplomats aimed towards peace maintenance. To be precise, the term is constituted of; peace building, peacemaking and peace enforcement (Solis 2010). The following discussion thereby, will critical evaluate the role that the law plays in situations of armed conflicts and further, it will illustrate how law gives guidelines on the conducts associated with hostility as well how it mitigates the fatal ends following the armed conflicts. Moreover, it will demonstrate how the law provide protection to civilians not only in international conflicts but also to non-international conflicts. In most cases, the main organization mandated to establish and implement peace operations is the United Nations. In regards to the last six years, the UN peace operations has gone through evolvement and thus lately integrated to the most important and main tool by which the international community uses to manage those crises that can be said to be complex and which pose as a threat to global security as well as peace (Solis 2010). The beginning of the new millennium saw the number of police, military and the civilian recruited in the peace keeping operation of the United Nations across the world adding up to the existing ones to exceptional levels. United Nations is a vital and efficient organization in dealing with the contemporary issues. It deals with issues such as; cease-fires, where they are called upon to monitor; Political

Good and Bad Discrimination Essay Example for Free

Good and Bad Discrimination Essay When the word discrimination is brought up there is an automatic negative response, due to the fact that most have this idea that there is only bad discrimination. This comes from people using stereotypes and being prejudice which creates detrimental situations. However, when a person discriminates it does not mean they are trying to be harmful. Discrimination is when one distinctively favors or is against certain groups, categories, people, and classes and or things that may come from them. Discrimination its self is not bad, but the things that can stem from it, are actually what makes people look at it negatively. People discriminate for many reasons such as religion, race, and even for business and employment. It is one thing to have a preference over something else but to actually deny a person over what race, or religion they are is perverse. Now there are some positives when decisions are made about things depending on an individual’s race or religion. There are people who only want to date or marry to the same race, religion, culture, category, class, and things like that. And that does not always mean that they are being racist, stereotypical, prejudice or anything of that nature but that they simple are particular. There are even laws that require for workplaces to accommodate for their employees religion just along their religious practices will not bring problems to the employer. However, in the eyes of the employer they may feel as though if they indeed hire someone with certain beliefs that conflict may arise even if they are unintentional, and a decision maybe made to avoid that. Which is a decent argument but it still is a form of discrimination. One of the biggest reasons people discriminate is that they are actually afraid of what they may or may not understand. â€Å"The fear of that which is different, that which we do not understand, could have been an adaptive strategy early on in our history† (Why Does Discrimination Occur?. Ehow. com ). Instead of learning how to live with something and become more educated about it they cast it out. Especially if it is something that it out of the norm, or different. Such as homosexuality, a lot of people are homophobic. They have an unreasonable fear of homosexuals and which they may have their reasons as to why. Some people take it past the limits to make people are attracted to the same sex feel different, unaccepted, or unwanted all because they are ignorant of that culture. They have no idea what it is like and instead of trying to comprehend, they use negativity. Now there is nothing wrong with not being gay, and disagreeing with it but an opinion does not have to be expressed in a way that may be harmful. Just because a person is not apart of a certain group does not excuse the act of disrespecting another group or category. A lot of individuals will argue that it is simply wrong, and that it should not be permitted due to religious reasoning. Yes, that does make a lot of since, but I am very sure that many people do things that go against their religion all the time, they just happen to be discrete. Some people are afraid or have been brought up to not over step the boundaries so when others do not abide by the same rules they are automatically looked down upon. Society assigns everyone a certain social identity. Which ever category a person is placed they tend to accept others who are from the same group as they are. Prejudice is derived from our tendency to divide world into ‘us’ and ‘them†( Musa, Prejudice Discrimination and Stereotype). This causes great division between people which is one of the reasons why a lot of people categorize other individuals. Being that prejudice, discrimination, and stereotype are in society there are social aspects and effects. â€Å"Exposure to derogatory ethnic labels can elicit conformity pressures with people wanting to fit-in† ( Musa, Prejudice Discrimination and Stereotype). Generally people fear to be outcast so they go with the crowd. Afraid that if they choose not to agree then they might become socially unexpected. â€Å"People can reduce their reliance on stereotypes by consciously saying no to association between stereotypes and specific social groups† ( Musa, Prejudice Discrimination and Stereotype). It would make a lot of since for people to simply not discriminate sadly that simply will not happen. Either way it may go it is up to the person on what they will choose to do, but social impact has a lot to do with the decisions people make. â€Å"Social influence plays a role in both maintenance and reduction discrimination, prejudice, and stereotypes. Evidence suggesting that members of their group hold less prejudiced views are out of line with most people of their group, they may change their views. † ( Musa, Prejudice Discrimination and Stereotype). â€Å"It may be conceived that because someone is guilty of discrimination that she is mean, angry and hateful, which very well may be the case. However, when we understand that within us all lies some form of discrimination, whether passive or aggressive, it should once again lead us to the conclusion that, of course, it is very easy to discriminate. (Why Is It So Easy To Discriminate? , eHow. com). Every person has their preferences, how they choose to go about them is completely their discretion. There are those who are prejudice, stereotypical, and who discriminate negatively acknowledge it and own up to it. â€Å"Each and every one of us stereotype and have a prejudice of something. Every single one of us. I stereotype fat people. I make fun of them, I call them lazy. Is it right? No. Should people suffering from obesity be kept from living their lives because of my prejudice and stereotypes of them? Absolutely not. † (Kriss 2010). Those who do discriminate have a point of view and some respectively explain them. Kriss discriminates against fat people, does she have that right? Yes, she knows that she should not do it, but she still stands by her opinion no matter what anyone else thinks. Everyone discriminates to a center extent because everyone has their own opinions, and make their own decision with different dependents. Yet and still there things that are wrong which happen to be connected to discriminating and even misconceptions. The way a person behaves is by far their own choice. People are raised differently, have different life experiences, and choose to surround themselves with certain crowds that may differ from others. There are exceptions and there are non exceptions, but being close minded will bring nothing but ignorance. There will always be discrimination because everyone will always have a preference. and there is really nothing that can be done about it. Also prejudice and stereotypes that comes with life. Everything has a positive and a negative.

Comparing Themes in The Return of the Native and Great Expectations :: comparison compare contrast essays

Themes in The Return of the Native and Great Expectations      Ã‚  Ã‚  Ã‚   Classic novels usually share in the aspect of universal themes which touch people through out the ages. All types of audiences can relate to and understand these underlying ideas. Victorian novels such as Thomas Hardy's The Return of the Native and Charles Dickens' Great Expectations are examples of literary classics that have universal themes. Hardy's tale illustrates the role of chance in his characters lives. Through the story we encounter events of pure coincidence and their effects. Dickens, considered to be more of a reformer (Literature Online), tries to portray a social theme in his novel. The basic theme of Great Expectations is that good does not come from ones social standing but rather comes from their inner value. These novels are considered classics because of their timeless themes.   Ã‚  Ã‚  Ã‚  Ã‚   Thomas Hardy's The Return of the Native displays a theme of chance. Book First, chapter 8 contains a perfect example. Eustacia persuades young Johnny Nunsuch into helping her feed a fire. She dismisses him and begins to walk home. Before reaching home, he is frightened by the light coming from the heath and returns to discover Wildeve meeting with Eustacia. By pure chance, Venn discovers the boy and quizzes him.    "Then I came down here, and I was afeard, and   I went back; but I didn't like to speak to her, because of the gentleman, and I came on here again" [Johnny Nunsuch]    " A gentleman--ah! What did she say to him, my man?"  Ã‚   [Diggory Venn]    "Told him she supposed he had not married the other woman because he liked his old sweetheart best; and things like that"  Ã‚   [Johnny Nunsuch]    [Book First, chapter 8, pp. 82]    This chance exchange reveals that Wildeve is meeting with Eustacia. Venn uses this to his advance by announcing himself to Mrs. Yeobright as a suitor for Thomasin. This backfires because Mrs. Yeobright tries to use the second suitor to force Wildeve to marry Thomasin. These events all occur from the chance meeting between Venn and Johnny Nunsuch. Another example of chance and coincidence can be seen in the famous gambling scene of Book Third, chapter VII. This is perhaps one of the most critically examined parts of the book.    " "Very well," said Wildeve, rising.

IOS 7 vs. IOS 6

IOS 7 vs. IOS 6 When Apple announced it's new OS back in March, many people were very excited at a change to the old IOS 6. As beta testing for the OS began and bugs began to intoxicate the new OS many consumers were left wondering if the need to switch at the final release was the best move and if so, what were the advantages or changes to the new OS. IOS 7 has changed many of the features of IOS 6, but many of the core elements of IOS 6 are ever-present.The First and most noticeable difference in IOS 7 is its new color scheme and lock screen. IOS 6 had a round design and color scheme that was reminiscent of factory gears, and its lock screen was a simple picture with a slider at the bottom. But in the new OS, the color scheme is neon and bright colors, flat design in the sense that none of the home screen apps seem 3d, but also the lock screen is a full screen picture with the date, time, and also a slide to unlock slider.Those few improvements o the overall OS were nice, but the s lide to unlock from the original OS 6 was still there and so were the large digital clock at the top. Another difference is the addition of Control Center. Control Center is a slider at the bottom of the screen that you slide up to use specific features of IOS 7, that in the older OS 6 you would have had to go to the settings menu. The features of Control Center include a slider for brightness, Wi-Fi control, Bluetooth control, and also one of IOS 7's new features, Airdrop.Once again, the new features are great, even though many of the uses of them were in IOS 6. All in all IOS 7 is a step forward in features and still stays true to its predecessor. The new color scheme and lock screen got a complete overhaul, while keeping the same features and core elements of OS 6. Also the addition of Control Center now uses the toggles that could have been found in the settings menu of 10s 6. So once again, apple has made a step up in its Operating System while still staying true to its predece asing one.