Chemistry class xii project Essay Example for Free

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

The Pearl : Appearances Can Be Deceiving Essay -- essays research pape

John Steinbeck's The Pearl tells the story of Kino, a poor pearl diver who lives in Mexico with his wife, Juana and his baby boy, Coyotito. One day Kino finds a huge pearl worth a great deal of money. Kino dreams of being rich and buying all that he wants after he sells the pearl. The one thing that Kino doesn't realize is that there are many people who will do anything to steal the pearl from him. No one ever suspects the pearl's power todeceive, corrupt, and destroy. Hence, The Pearl depicts the ultimate battle between good and evil. When Kino finds the pearl he is shocked. " It was as large as a seagull's egg. It was the greatest pearl in the world" (Steinbeck 19).Kino and Juana revel in the excitement thatsurrounds Kino's finding the pearl, but their happiness soon turns to distrust. The pearl buyers, whoKino has to sell the pearls to in order to make a profit, try to cheat him. They tell him that the pearl is so big that it has no value. Kino has to hide the pearl, but while he sleeps a thief tries to steal it. The doctor who would not treat Coyotito's scorpion bite when they had no money now comes to them offering the best medical care he can provide.As the story of Kino's situation unfolds, Kino is forced to kill three men, and worst of all, Kino accidentally shoots Coyotito in the head while he is trying to shoot his pursuers. Finally, at Juana's urging, Kino throws the pearl back into the sea. He has made nothing from his fin... The Pearl : Appearances Can Be Deceiving Essay -- essays research pape John Steinbeck's The Pearl tells the story of Kino, a poor pearl diver who lives in Mexico with his wife, Juana and his baby boy, Coyotito. One day Kino finds a huge pearl worth a great deal of money. Kino dreams of being rich and buying all that he wants after he sells the pearl. The one thing that Kino doesn't realize is that there are many people who will do anything to steal the pearl from him. No one ever suspects the pearl's power todeceive, corrupt, and destroy. Hence, The Pearl depicts the ultimate battle between good and evil. When Kino finds the pearl he is shocked. " It was as large as a seagull's egg. It was the greatest pearl in the world" (Steinbeck 19).Kino and Juana revel in the excitement thatsurrounds Kino's finding the pearl, but their happiness soon turns to distrust. The pearl buyers, whoKino has to sell the pearls to in order to make a profit, try to cheat him. They tell him that the pearl is so big that it has no value. Kino has to hide the pearl, but while he sleeps a thief tries to steal it. The doctor who would not treat Coyotito's scorpion bite when they had no money now comes to them offering the best medical care he can provide.As the story of Kino's situation unfolds, Kino is forced to kill three men, and worst of all, Kino accidentally shoots Coyotito in the head while he is trying to shoot his pursuers. Finally, at Juana's urging, Kino throws the pearl back into the sea. He has made nothing from his fin...

“Habit is a great deadener”. In what ways does Waiting for Godot illustrate this idea? Essay

Habit and routine form an important part of the play Waiting for Godot, by Samuel Beckett. The play, a famous product of the ‘Theatre of the Absurd’, is characterized by a circular structure which doesn’t lead anywhere, repetitive dialogue and a general absurdity. It witnesses two men, Vladimir and Estragon, who spend the entire two acts waiting for Godot. The routines they develop throughout the play are mainly a result of their attempts to pass the time. Habits such as fiddling with objects and telling stories become part of their routine and seem like a good way to get through the waiting. However, as Vladimir himself says, â€Å"habit is a great deadener† (Beckett 105) and eventually their habits deaden them. The term â€Å"deadener† implies that the habits make the characters even more bored and that instead of helping them, they lead to their downfall and make their lives even more meaningless. This essay will discuss the habits developed by the various characters and explore whether they indeed illustrate the idea of habits being a deadener. Through this, it will also discuss what Beckett is trying to prove about habit in human life in general. One habit that is developed in Waiting for Godot by both Estragon and Pozzo is fiddling with objects. This habit is portrayed mainly through the stage directions and is therefore visual action instead of words. Estragon uses objects such as his boot in order to pass time. â€Å"Silence. Estragon is fiddling with his boot again† (Beckett 37). In this stage direction, Beckett places Estragon’s fiddling within a silence which shows how he tries to fill the void by playing with his boot. This habit is formed out of boredom and therefore designed to relieve it. Through this, Beckett seems to be commenting on how human beings rely on habits in order to give their lives meaning and security. However, instead of making life more interesting, the repeated fiddling only reinforces the monotony in the play making the characters even more bored. Pozzo on the other hand fiddles mostly with his watch, â€Å"cuddling his watch to his ear [†¦] he puts his watch back in his pocket† (Beckett 37). He repeatedly takes his watch out, consults it, puts it away, and gets it out again in a very routinely manner. He does not only do this to pass the time; it is also a way for him to prove his superiority through the material objects he owns. It is important for him to continuously assert his power and position. However, instead of giving him power, this habit eventually contributes to his downfall. In the second act, Pozzo becomes blind and loses all his power. A second way for Pozzo to prove his power and seek attention is by performing which also becomes habitual. At several occasions, Pozzo takes on another role and starts performing in order to entertain the others and become the centre of attention. He usually performs dramatic monologues, â€Å"tirelessly torrents of red and white light it begins to lose its effulgence† (Beckett 38). This sentence clearly shows his eloquent diction chosen to impress his audience and again prove his superiority. The varied syntax of this particular speech, ranging from complicated poetic sentences to short crude phrases, makes it interesting to his audience and shows how he is indeed acting. Every time he takes on a role, he ensures that everyone is paying attention to him because that is his ultimate goal. Routines are a way for people to define themselves by what they habitually do. But again, this habit turns out to be a deadener which is illustrated by Pozzo’s sudden change of status in the second act. Suddenly he is blind and no one pays attention to him anymore. He repeatedly asks for help but no one responds and this proves how his habits deadened him. A similar habit to that of performing is telling stories. It is one of the first habits to be introduced in the play and is again a way for them to fill the time. In the beginning of the play, Vladimir attempts to tell his first story, but Estragon repeatedly interrupts him: â€Å"two thieves, crucified at the same time as Our Saviour. One – / our what?† (Beckett 6). This habit is almost an immediate deadener as it fails to achieve its goal of passing time and giving them something to do. Estragon’s interruptions undermine Vladimir’s capabilities as a story teller and turn the stories into meaningless, circular debates. Instead of storytelling becoming a routine to give their lives meaning, it becomes a reinforcement of the meaninglessness of their existence proving that they aren’t going anywhere. None of the routines or habits they develop is helping. They are in fact doing the opposite and making their situation worse. They are still stuck waitin g for Godot and always will be. Waiting in itself could be considered as a deadening habit. It is definitely the dominating habit in the play as they are continuously waiting. The phrase â€Å"we’re waiting for Godot† (Beckett 51), which also inspires the title, is the most repeated sentence in the entire play. The fact that it is repeated so many times shows how desperate and meaningless their situation has become. The repetition of the phrase emphasises its importance to the overall play because even though it is very simple, it sums up the entirety of the play. This habit is arguably the most deadening of all as it prevents them from leaving and going on with their lives. It forces them to stay put and thereby takes all the meaning out of their existence, diminishing them to mere spectators rather than participators in life. A final habit that Estragon and Vladimir develop is that of staying together. In staying together, they attempt to avoid the insecurity of being lonely and try to use each other to confirm that their lives do have meaning. â€Å"I felt lonely†, says Vladimir when Estragon falls asleep (Beckett 10). This simple sentence is the very essence of why they develop the habit of staying together. Even though Estragon is physically there, Vladimir has no one to talk to anymore and this agitates him. They need each other even if they don’t always get along in order to confirm each other’s existence. At the slightest threat of being left alone, they panic and therefore stay together as a matter of necessity. The above quotation invokes pathos in the audience as they realise how strong their reliance is upon one another and therefore how low they have sunk as individuals. They are trying to avoid insecurity through their habits, but Beckett is implying that this is impossible and that habits will lead to monotony and insignificance in your life. Instead of profiting from each other, staying together prevents them from moving forward and thereby deadens them. Habit is indeed a deadener and Waiting for Godot illustrates this in numerous ways. All four characters in the play have been deadened by their habits and instead of their routine saving them, they caused their downfall. It seems as if Beckett is trying to illustrate how habit affects people in reality. It is unavoidable as human beings to develop habits. It is almost like a natural mechanism in order for us to avoid absurdity in life. However, Beckett implies, one has to accept absurdity as it is part of life. Habits won’t give us the security we need, they will only bring monotony and eventual deadening to our lives as happened in Waiting for Godot. This play is obviously part of absurdist theatre and therefore an exaggeration, however Beckett seems to be relating it to real life to a certain extent. He seems to be advising to prevent from developing habits and instead accept the randomness that unavoidably accompanies life. Work cited: Beckett, Samuel. Waiting for Godot. Grove Press: New York, 1982.

English Grammar