Enthalpy Change Definition in Science

An enthalpy change is approximately equal to the difference between the energy used to break bonds in a chemical reaction and the energy gained by the formation of new chemical bonds in the reaction. It describes the energy change of a system at constant pressure. Enthalpy change is denoted by ΔH. At constant pressure, ΔH equals the internal energy of the system added to the pressure-volume work done by the system on its surroundings. Exothermic and Endothermic Reactions For an endothermic reaction, ΔH is a positive value. For an exothermic reaction, ΔH has a negative value. This is because heat (thermal energy) is absorbed by the endothermic reaction, while it is released by the exothermic reaction. Enthalpy Change Versus Entropy Enthalpy change and entropy are related concepts. Entropy is a measure of the disorder or randomness of a system. In an exothermic reaction, the entropy of the surroundings increases. As heat is evolved, the energy imparted to the system increases disorder. In an endothermic reaction, the external entropy decreases. As heat is absorbed by a process or reaction, the kinetic energy of molecules in the surroundings decreases, which tends to reduce reduce disorder.

Literature A Road For Victory - 1156 Words

Literature: A Road to Victory â€Å"The best way to think about reality, I had decided, was to get as far away from it as pos-sible†¦Ã¢â‚¬  (Murakami). What better way to escape than to read that favorite book of yours. Don’t have a favorite book? Well, let me introduce you to the wonderful world of literature. Like many others out there today, one may think reading is boring. I’d like to think that is only because they have not found that one book that catches their attention. It is sort of like those who judge food without trying it; you don’t know until you try it. Being forced to read a book in high school is not the same as reading a book for pleasure. When you take the time to read, and actually com-prehend what is written, it can open your eyes to a completely new world you had no idea exist-ed. It is another form of your imagination; and without imagination, how can people do and cre-ate the new technology for our future? Literature is one of the most important things in this w orld. This will give you the knowledge you need to complete anything in life: it is truly the key to success. Literature allows people to escape reality. It can also be very calming to some. Reading about others and seeing life through their eyes can often bring light to a situation. It’s almost as if you re walking in their shoes. Poems, short stories, and novels are a great example of ways to escape for most people who read. You can genuinely relate to what the author is trying to express throughShow MoreRelated Wilfred Owens Dulce Et Decorum Est, Tim OBriens The Things They Carried, and Siegfried Sassoons Suicide in the Trenches1360 Words   |  6 Pagesand heart-felt images as they write about the true occurrences, problems, feelings and emotions that soldiers encountered throughout times of war. 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Oedipus Whos fault was it free essay sample

Whos Fault Was It? If one were to look for an individual to blame in the tale of Oedipus many characters would stand out. Assigning fault on Just one character of this story would be challenging since almost every character is trying to cheat fate. If there was really one character that could have prevented all this tragic Father killing and Mother loving who would it be? The story spirals on in a whirlwind of destiny with each step taken by all characters to avoid an impending fate and leading to an even more imminent and closer step to the final tragic outcome. One could look to the beginning, the exact point where King Laois seeks an audience with the Oracle of Delphi to learn his future. The question to ask is if the oracles prophecy had never been spoken would the chain of events have taken place causing King Laios to fear his own son and send him away to die. We will write a custom essay sample on Oedipus Whos fault was it? or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page Laois being so curious of his destiny could have avoided his own death had he not learned the prophecy and tried so hard to avoid it. If Oedipus had been raised by his biological parents the probability that he would ave killed his father and marry his mother might have decreased. When taken away to be destroyed the herdsman responsible for leaving baby Oedipus to the elemenst did not have the resolution to complete the task. Instead he gave Oedipus toa messenger in the hopes that he would take the infant to a faraway land and no one would ever know that Oedipus had not perished as ordered. If Oedipus had died as an infant then the prophecy would never come true and Laioss death would have been prevented. Oedipus was received by a childless King and Queen to raise as heir own. King Polybus and Queen Merope loved Oedipus very much and did not tell him that he was not their biological child. Rumors did circulate about Oedipuss true parentage so he decided to visit the oracle and learn the truth. Instead of hearing that his parents were not truly his he learned that he would kill his father and marry his mother. The oracle did not mention that Polybus and Merope were not his biological parents so in fear of the foretold prophecy Oedipus flees from his home and travels far away in hopes of avoiding his proclaimed fate. Upon fleeing from his home to evade such a gruesome outcome, Oedipus meets a group of men at a crossroads. The carriage driver tries to push Oedipus off the road. In a rage most likely exasperated by the news of his learned prophecy Oedipus kill most of the men in the caravan. Unbeknownst to him he had Just completed the first part of his prophecy. He had killed his biological father King Laois. In an attempt to sidestep fate Oedipus actually makes it come true. When Oedipus arrives at Thebes he defeats the riddle of the Sphinx there in saving the city. This makes Oedipus a hero and by becoming the savior of the city he ends up marrying Jokosta, a newly widowed Queen. It makes sense that a city without a King would wish that their new hero would become their new leader. Oedipus doesnt realize that he has Just married his biological mother. He lives for years with her thinking he has successfully avoided the prophecy yet in reality ne nas completed the prophecy by marring his own mother and killing his father. Many aspects happened in this story that causes

Streetcar Named Desire Essays - English-language Films,

Streetcar Named Desire 'A Streetcar Named Desire' is a very socially challenging play in the way in which Tennessee Williams depicts how brutal and deceiving human nature can be. He takes the point of view that no matter how structured or 'civilized' society is all people will rely on their natural animal instincts, such as dominance and deception, to get themselves out of trouble at some stage in life, even if they don't realize it. William's has created three main characters of society, they are, Blanche Dubiou, Stella and Stanley Kowalski. Each of these characters is equally as civilized as one another, yet their acts of savagery are all on different levels. Throughout the play Williams symbolically relates these three characters to animals, 'savages,' by the use of their attitudes, beliefs, appearances and desires. The most obvious example of a savage in the play is Stanley Kowalski. He is a large well-toned, territorial male with simple beliefs and a short temper. He does not have many manners and does not care what people think of him. He seems very simple but there I much more to him. He feels threatened by Blanche because she moves in on his territory and wants Stella to leave him. At first, Stanley acts physically dominant over both Blanche and Stella; by rifling through Blanches possessions (act 1 scene 3 pg.124 ), quoting to Stella and Blanche that ?every man is a king? (act scene 8 pg.197-198 ), throwing the radio out the window in a drunken frenzy and actually striking his pregnant wife (Stella) (act 1 scene 3 pg. 152-155). However, towards the end of the play, Stanley realizes his power over Blanche and he acts a lot wiser, but still with the same intentions. He dresses smarter, talks to her nicely, but mockingly, and finally rapes her just to prove his status and to fulfill his ?desire? (act 1, scene 10, pg.215). In the powerful scene where Stanley looses total control of his actions and strikes the person who he has sworn to protect, love and to hold. William's shows Stanley's lack of control and hatred to a new threat in his life, Blanche. What makes this scene so important to the topic is the way that the three characters react once the party has broken up. Blanche is in her usual state of panic; Stella has retreated to up-stairs while Stanley stumbles around calling out 'Steeelllaaa' in a drunken sweaty animal like manner. Surprisingly Stella answers to her 'mate's' calls and embraces him, they then exchange words of compassion and kiss, Stanley then picks her up and carries her off to his den to make-love, which is Stanley's way of saying sorry. Stanley has to be the domineering figure in his relationships we see it not only with Stella and Blanche, but with his friends as well. He is a leader and does not like it when someone tries to complicate his role. William's uses a different type of savagery in Blanche's character. Blanche is more deceptive and exaggerated than Stanley is, he tries to hide her age, from others, by constant bathing and dim lighting, and from herself, by drinking and lying. Through out the whole play she is trying to hide here real identity, the actual animal instincts that are inside her. She hides these with perfume, wearing fancy clothes, even by putting a lampshade to hide the actual light. She also attempts to steal Stella away from Stanley by relating him to an animal. This is best represented when Blanche says; "He acts like an animal, has animals habits! Eats like one, moves like one, talks like one! There's even something - sub-human - something Not quite to the stage of humanity yet! Yes, something - ape-like about him, like one of those pictures I've seen in ? anthropological studies! Thousands and thousands of years have passed him right by, and there he is - Stanley Kowalski ? survivor of the Stone Age! Bearing the raw meat home from the kill in the jungle!studies! Thousands and thousands of years have passed him right by, and there he is - Stanley Kowalski - survivor of the Stone Age! Bearing the raw meat home from the kill in the jungle!? (act 1 scene 9 pg. 119). Despite the fact that there is a lot of truth in Blanche's words she deceives herself by her drinking and her need to feel 'wanted by men'. She blames society for these 'cravings' and states that she only does it to 'survive'.