Testing Liquids for polarity Essay Example for Free

Testing Liquids for polarity Essay Results and Observations: Liquids Results Shape of molecule or Lewis Structure Conclusions Distilled Water 4 cm of deflection The water molecule is very polar. This is because the only oxygen in the molecule is left with 2 lone pairs which give as a result an enormous negative center. On the other hand, the two H atoms are positive resulting into a very polar molecule. As a result, the stream of distilled water has a quite large deflection which almost went out of the beaker. Heptane 2 mm of deflection The deflection is very small, almost impossible to detect. Because of this we can conclude that this molecule is non-polar as no attraction towards the charged ruler is shown. Ethanol 3 to 4 cms of deflection In this case, the deflection of the stream is bigger and more obvious to human eye. As we can see in the structure of the molecule, the oxygen atom is left with 1 lone pair which makes it into a medium size negative center. However all the carbons and the hydrogen atoms in the left of the oxygen exert a positive charge bigger than the negative charge which makes it polar. However although there is polarity, the stream isnt deflected so much. Propanol 3 cm of deflection Although the structure of this molecule is quite similar to the one of HEPTANE, in the case of PROPANOL, we can see an oxygen atom which again is left with 1 lone pair1 which creates a negative center in the right of the molecule. However, this negativity is balanced thanks to the C and H atoms in the left. This is way this molecule is polar but not enough to deflect the stream so much. This is why it shows a medium deflection of 3 cms. Propanone 2 cm of deflection This molecule shows as very weak polarity because the only way of this molecule being polar is the double bonded Oxygen-Carbon bond. Oxygen is more electronegative than carbon which gives as a result a very weakly charged dipole. In conclusion, the stream wont deflect a lot. Ethanoic Acid 5 cm of deflection In the case of this molecule, we can see 2 O atoms which in total are left with 3 lone pairs which create a gigantic negative center. The rest of the atoms of the molecule arent capable of dealing with these forces so the molecule turns out extremely polar. This is why we can see a very big deflection in this case. Ethyl acetate 3 cm of deflection This is a moderately polar molecule which shows a medium deflection of the stream. This is because although it has 2 O atoms one of them located on the top of the molecule, the lone pairs of these O atoms cant exert that big amount of negative force as to create a very polar molecule. Another factor is the presence of H and C atoms in both sides of the O atoms which balance the forces of the lone pairs. In conclusion, although its a polar molecule, due to the position of the O atoms and the H and C atoms, Ethyl Acetate didnt deflected that much the stream Ethane-1,2-diol 4 to 5 cms of deflection This molecule is clearly polar because of the great deflection that is caused by it. There are two O atoms each one with a lone pair which creates a very powerful negative center which makes the molecule to be polar. Increasing Order of Polarity Downwards HEPTANE PROPANONE PROPANOL ETHYL ACETATE ETHANOL DISTILLED WATER ETHANE-1,2-DIOL ETHANOIC ACID Camilo Lovera Trujillo Testing Liquids for polarity Evaluation / Improvements: Limitations / Errors Improvements * Bad smell of substances. * Many of the substances we were working with, had a very strong and bad odor which spread all the way over the class. Due to this smell, many of the students found difficult to concentrate and to be able to record correctly the deflection of the streams. Its better if the students wear any type of mask or mouth covering so that focusing of students isnt affected by the smell. * Electrically-charged rod * For being able to deflect the stream of the substances it was necessary to have an electrically charged rod which could attract the stream However, is difficult to keep a fair test in charging the rule or the rod because it was possible that in some cases, the rod was more charged than others. A possible solution to this is to change the rod for a magnet or and object which is already magnetized so that the same attraction force is kept during all the experiment and no possible inaccuracy in the deflection of the streams can happen. * Deflection * The deflection, in some cases, was difficult to record. Unfortunately, we had no instrument to measure the deflection but our own eyes. It was possible to use the ruler but it was also very difficult as everything happened very fast. Due to this, there might be some inaccuracy in the results as they were recorded with what we saw and estimated to be the deflection. Maybe a way to help recording more accurately the information is to use instead of a beaker, a kind of deep transparent tray placed over a ruler so that is easier to measure the deflection Camilo Lovera Trujillo Testing Liquids for polarity Conclusion: In conclusion, this practical helped us to find the relationships between the Lewis structure or the molecule structure and the deflection the substances caused when they were near to an electrically-charged rod. From the observations and results we can also conclude that the C atoms reduce the polarity of the molecules as they created positive center in the molecule. However, it was thanks to the O atoms n most of the molecules that their polarity was considerably increased as they were left with lone pairs which helped to create negative center even bigger than the positive ones and due to this, deflect more the streams. On the other hand, theres a final conclusion to be made and is about the order of the polarity. Acids are the most polar substances just after the amides. In the case of Ethanoic Acid, we can see that it makes part of the most polar substances tested in this experiment as a result of the H bondings and the presence of the 2 atoms of O. Going down the list we will f ind: Alcohols, Ketones, Aldehydes, Amines, Esters, Ethers and Alkanes. Camilo Lovera Trujillo Testing Liquids for polarity Bibliography for Images of Lewis Structure and Molecular Structures: * http://www.chem.purdue.edu/gchelp/molecules/heptane.gif * http://www.uni-saarland.de/fak8/schneider/anichem/struktur/ethanol.gif * http://www.fisicanet.com.ar/quimica/organica/ap1/propanol01.gif * http://www2.open.ed.jp/data/37561/01/1221system/images/CH3COCH3.jpg * http://scienceaid.co.uk/chemistry/organic/images/ethanoicacid.jpg * http://www.steve.gb.com/images/molecules/alcohols/ethane-1,2-diol.png Bibliography for additional Information: * http://www.elmhurst.edu/~chm/vchembook/213organicfcgp.html

Capital Punishment Essay: Benefits of the Death Penalty :: Persuasive Essay, Argumentative

The Benefits of the Death Penalty Crime is everywhere. Wherever we look, we find criminals and crime. Criminals have become a part of our daily lives. Does this mean we let them be the darkness of our society? No, definitely not. Eliminating crime and criminals is our duty, and we cannot ignore it. Getting the rightly accused to a just punishment is very important. Some criminals commit a crime because they have no other option to survive, but some do it for fun. I do not advocate death penalty for everybody. A person, who stole bread from a grocery store, definitely does not deserve death penalty. However, a serial killer, who kills people for fun or for his personal gain, definitely deserves death penalty. Death penalty should continue in order to eliminate the garbage of our society. Not everybody deserves to die, but some people definitely do. I support death penalty because of several reasons. Firstly, I believe that death penalty serves as a deterrent and helps in reducing crime. Secondly, it is true that death penalty is irreversible, but it is hard to kill a wrongly convicted person due to the several chances given to the convicted to prove his innocence. Thirdly, death penalty assures safety of the society by eliminating these criminals. Finally, I believe in "lex tallionis" - a life for a life. Deterrence means to punish somebody as an example and to create fear in other people for the punishment. Death penalty is one of those extreme punishments that would create fear in the mind of any sane person. Ernest van den Haag, in his article "On Deterrence and the Death Penalty" mentions, "One abstains from dangerous acts because of vague, inchoate, habitual and, above all, preconscious fears" (193). Everybody fears death, even animals. Most criminals would think twice if they knew their own lives were at stake. Although there is no statistical evidence that death penalty deters crime, but we have to agree that most of us fear death. Suppose there is no death penalty in a state and life imprisonment without parole is the maximum punishment. What is stopping a prisoner who is facing a life imprisonment without parole to commit another murder in the prison? According to Paul Van Slambrouck, " Assaults in prisons all over US, both against fellow inmates and against staff, have more than doubled in the past decade, according to statistics gathered by the Criminal Justice Institute in Middletown, Connecticut" (Christian Science Monitor, Internet).

Never Give Up

ENG COMP II Dec. 10, 2008 Never Give Up â€Å"The Rookie† is a 2002 Walt Disney movie that is based on the real-life story of Jim Morris that stars Dennis Quaid in the lead role. â€Å"The Rookie† is also a movie that reflects not only our nations' culture, but also the collective attitude we have towards believing in an individuals' dreams. When a shoulder injury ended his minor league pitching career, Jim Morris resorted to the next best thing: coaching. But Jim's team, The Owls, know their coach is a great ball player and thus make a deal with him: if they win the district championship they want him to try out for a major-league team. Going from worst to first, the team makes it to state and Jim is forced to live up to his end of the deal. At the age of 35 he makes it onto a minor league team and now has to deal with the pressures of a â€Å"younger mans'† sport, life on the road and being separated from his wife and family. The pressures build and like a typical Disney movie, the dream becomes reality at what would seem to be the absolute last moment. Quaid, as Jim Morris, would then take the mound that very same night while his friends and family watched, some from their homes but most from the stands. Morris would then continue to play as one of the relief pitchers for the Tampa Bay Devil Rays over the next two seasons before officially calling it quits. The theme for this movie is obvious and simple: Never give up on your dreams, for it is never too late to believe in them. From the beginning of the movie we see Morris as an adolescent in a variety of locations and weather conditions, but we always see him pitching a baseball. That is until his mother cries out to him saying: â€Å"Jimmy, your father and I need to talk to you. † By now Jimmy is well aware of what his father, who is in the U. S. Marines, is going to say. For the fourth time they are relocating and Jimmy has to put his pitching dreams on hold. That is until his father gets a permanent duty station in Big Lake, Texas. With a bit more exposition and rising action Jimmy meets Henry Sampson in the town store where he learns the town doesn't care much for baseball, but they do care about something else – dreams. Henry then relates the story of the towns' very beginnings and how a man with dreams of finding oil â€Å"right under his feet† got the financial, and spiritual, help he needed from two nuns. The movie steps back in time to 1921 where the camera follows the nuns as they are shown blessing the field with rose pedals and reciting a prayer to Saint Rita, the patron saint of impossible dreams. While the men waited for the oil that would eventually come, they passed the time playing baseball. A few of the men were able to fulfill yet another dream as they got drafted into the major leagues. After hearing the story, the camera follows a teenage Jimmy riding his bike to the field where, on camera close up, he brushes off the pitchers' strip and with a look of determination and steadfastness he digs into the mound with his sneaker and looks at the original oil well. A camera close up shows the sign on the well, ‘SANTARITA No. 1 Completed May 27, 1923'. When it pans back to Jimmy, time has moved forward 20 years, still standing on that very same mound but now as a full grown man however his look is not the same and the well has been out of operation for quite some time. His close up look and facial expression tells us of a dream, like the oil well, that got ‘dried up' before its' time as he digs his boots into the pitchers' mound. However, as a reminder that not all is as it seems to be, the camera focuses on Jimmy's truck where a medallion of Saint Rita hangs from the rear-view mirror. From the man who dreamed of finding oil, to the nuns who dreamed of getting their moneys' worth, to the town that was founded and thrived on those dreams, to Jimmy, and to everyone whoever was or has been, they all have an individual dream they are willing to pursue. They are not unique in this, as it is something that can be traced to, and shared with, the founding fathers of our nation. They had a dream for freedom and representation that they were willing to fight and die for. Two world wars and countless others were fought for one main ideal – to keep the dream alive. Whether the dream be for territory or freedom from oppression, it does not matter. Keeping, pursuing and accomplishing the dream is within everyone of us and, as is the case with Jim Morris, it does not matter how long it takes; dreams can be fulfilled. The movie â€Å"The Rookie† serves to remind us that in todays' culture that while our dreams may be individual they can, and often do, reach father than our imagination could ever anticipate. In our modern day, dreams are fulfilled everywhere by those willing and determined enough to make them happen. While these dreams may be on an individual basis, they can be, and are often, shared across the nation. One only has to look at the world of sports to bear witness to some of the most compelling individual efforts that have a nation dreaming right along with them. Lance Armstrong won the grueling Tour de France bicycle race seven times after beating testicular cancer. The 2008 Summer Olympics, where the best of the best across the world come to compete, saw Michael Phelps win a world-record eight Gold medals in swimming. To accomplish his dream Phelps would have to swim two major races a day, each day, for four days straight. And a majority of Americans would watch and be with him stroke for stroke cheering him on, praying for the dream that would come true. Closer to home, Mary Alison Milford, a Fayetteville native, competed in the Paralympics on the U. S. Wheelchair Basketball team that defeated Germany for the Gold Medal. I dare anyone to attend a championship game anywhere, and to tell me that they could not physically feel the home-town audiences' presence. You can taste it in the air, it is a live electricity that raises the hair on your arm, it is the simple awe and power of the many becoming one for a dream and it is never too late to dream. Even if the dream is as individually personal as graduating from school with a Masters degree 20 years after you first started taking classes. Dare I to dream and see the words Cum Laude on my diploma? I believe I just have. Work Sited The Rookie. Dir. John Lee Hancock. Perf. Dennis Quaid, Rachel Griffins, Brian Cox; screenplay by Mike Rich. Walt Disney Pictures, 2002. DVD. Walt Disney Home Video. 2002. Never Give Up ENG COMP II Dec. 10, 2008 Never Give Up â€Å"The Rookie† is a 2002 Walt Disney movie that is based on the real-life story of Jim Morris that stars Dennis Quaid in the lead role. â€Å"The Rookie† is also a movie that reflects not only our nations' culture, but also the collective attitude we have towards believing in an individuals' dreams. When a shoulder injury ended his minor league pitching career, Jim Morris resorted to the next best thing: coaching. But Jim's team, The Owls, know their coach is a great ball player and thus make a deal with him: if they win the district championship they want him to try out for a major-league team. Going from worst to first, the team makes it to state and Jim is forced to live up to his end of the deal. At the age of 35 he makes it onto a minor league team and now has to deal with the pressures of a â€Å"younger mans'† sport, life on the road and being separated from his wife and family. The pressures build and like a typical Disney movie, the dream becomes reality at what would seem to be the absolute last moment. Quaid, as Jim Morris, would then take the mound that very same night while his friends and family watched, some from their homes but most from the stands. Morris would then continue to play as one of the relief pitchers for the Tampa Bay Devil Rays over the next two seasons before officially calling it quits. The theme for this movie is obvious and simple: Never give up on your dreams, for it is never too late to believe in them. From the beginning of the movie we see Morris as an adolescent in a variety of locations and weather conditions, but we always see him pitching a baseball. That is until his mother cries out to him saying: â€Å"Jimmy, your father and I need to talk to you. † By now Jimmy is well aware of what his father, who is in the U. S. Marines, is going to say. For the fourth time they are relocating and Jimmy has to put his pitching dreams on hold. That is until his father gets a permanent duty station in Big Lake, Texas. With a bit more exposition and rising action Jimmy meets Henry Sampson in the town store where he learns the town doesn't care much for baseball, but they do care about something else – dreams. Henry then relates the story of the towns' very beginnings and how a man with dreams of finding oil â€Å"right under his feet† got the financial, and spiritual, help he needed from two nuns. The movie steps back in time to 1921 where the camera follows the nuns as they are shown blessing the field with rose pedals and reciting a prayer to Saint Rita, the patron saint of impossible dreams. While the men waited for the oil that would eventually come, they passed the time playing baseball. A few of the men were able to fulfill yet another dream as they got drafted into the major leagues. After hearing the story, the camera follows a teenage Jimmy riding his bike to the field where, on camera close up, he brushes off the pitchers' strip and with a look of determination and steadfastness he digs into the mound with his sneaker and looks at the original oil well. A camera close up shows the sign on the well, ‘SANTARITA No. 1 Completed May 27, 1923'. When it pans back to Jimmy, time has moved forward 20 years, still standing on that very same mound but now as a full grown man however his look is not the same and the well has been out of operation for quite some time. His close up look and facial expression tells us of a dream, like the oil well, that got ‘dried up' before its' time as he digs his boots into the pitchers' mound. However, as a reminder that not all is as it seems to be, the camera focuses on Jimmy's truck where a medallion of Saint Rita hangs from the rear-view mirror. From the man who dreamed of finding oil, to the nuns who dreamed of getting their moneys' worth, to the town that was founded and thrived on those dreams, to Jimmy, and to everyone whoever was or has been, they all have an individual dream they are willing to pursue. They are not unique in this, as it is something that can be traced to, and shared with, the founding fathers of our nation. They had a dream for freedom and representation that they were willing to fight and die for. Two world wars and countless others were fought for one main ideal – to keep the dream alive. Whether the dream be for territory or freedom from oppression, it does not matter. Keeping, pursuing and accomplishing the dream is within everyone of us and, as is the case with Jim Morris, it does not matter how long it takes; dreams can be fulfilled. The movie â€Å"The Rookie† serves to remind us that in todays' culture that while our dreams may be individual they can, and often do, reach father than our imagination could ever anticipate. In our modern day, dreams are fulfilled everywhere by those willing and determined enough to make them happen. While these dreams may be on an individual basis, they can be, and are often, shared across the nation. One only has to look at the world of sports to bear witness to some of the most compelling individual efforts that have a nation dreaming right along with them. Lance Armstrong won the grueling Tour de France bicycle race seven times after beating testicular cancer. The 2008 Summer Olympics, where the best of the best across the world come to compete, saw Michael Phelps win a world-record eight Gold medals in swimming. To accomplish his dream Phelps would have to swim two major races a day, each day, for four days straight. And a majority of Americans would watch and be with him stroke for stroke cheering him on, praying for the dream that would come true. Closer to home, Mary Alison Milford, a Fayetteville native, competed in the Paralympics on the U. S. Wheelchair Basketball team that defeated Germany for the Gold Medal. I dare anyone to attend a championship game anywhere, and to tell me that they could not physically feel the home-town audiences' presence. You can taste it in the air, it is a live electricity that raises the hair on your arm, it is the simple awe and power of the many becoming one for a dream and it is never too late to dream. Even if the dream is as individually personal as graduating from school with a Masters degree 20 years after you first started taking classes. Dare I to dream and see the words Cum Laude on my diploma? I believe I just have. Work Sited The Rookie. Dir. John Lee Hancock. Perf. Dennis Quaid, Rachel Griffins, Brian Cox; screenplay by Mike Rich. Walt Disney Pictures, 2002. DVD. Walt Disney Home Video. 2002.

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