Combustion of a series of Alcohols Essay Example for Free

Combustion of a series of Alcohols Essay The larger the surface area over which the reaction can occur, and the faster the reaction rate. This is because small particles have a large surface area in relation to their volume more particles are exposed and available for collision this means more collisions take place so the reaction is faster. Oppositely large particles have small surface area in relation to their volume fewer particles are exposed and available for collisions. This means less collisions and a slower reaction. To ensure that my test will be fair I have to keep all these factors the same except for one, the concentration. I will have to control the temperature of the room; the particle size will be same as I will shake the substance so it will be equally diffused. Hypothesis I predict that the higher the concentration of hydrochloric acid the faster the reaction occurs. The lower the concentration the slower the reaction is. Supporting information I base this hypothesis on the collision theory as I know that concentration affects the reaction greatly. This is because when there is a higher concentration the particles are closely packed together and there are more successful collisions occurring, thus making the reaction happen quicker. Preliminary For my preliminary I have used various concentrations of hydrochloric acid and 4cm of magnesium ribbon. The concentrations that I decided to experiment was he reason why I am doing a preliminary experiment is so that I know which concentrations of hydrochloric acid to use that would make my experiment more convenient. For the actual preliminary experiment I reacted hydrochloric acid with magnesium ribbon to see how long it took. I did this by watching when the magnesium ribbon had stopped reacting and disappeared. Although I was just using this method to find out how long a particular concentration took to finish reacting I attached a glass syringe to my conical flask to observe how much hydrogen was being produced, so that I could be prepared when it came to doing my actual experiment. The table below shows the amount of hydrochloric acid and water I used for a certain percent and the time taken for the magnesium ribbon to fully stop reacting. Volume of HCL (ml) Volume of H2O % of concentration Time taken for the mg ribbon to disappear (in seconds). From looking at the information from my preliminary I have decided to use the following concentrations for my actual experiment: 20%, 40%, 60%, 80%, 100%. The reason why I have decided to use these percentages of concentrations is because even though it shows a variety it will not be as time consuming as 10% concentration of hydrochloric acid took 1205 seconds which was approximately 20 minutes. 10% concentration took so long that I didnt have enough time, there for I left it anonymous. I also realised that even though I experiment 20% of hydrochloric acid it will still take long, there for I decided to lower the amount of magnesium ribbon so I decided to use 3. 5cm instead of 4cm. From doing my preliminary I have decided to repeat my experiment 3 times because this will give me a more reliable results to choose from and an average. This also will be less time consuming then repeating it 5 times. The preliminary experiment also helped my produce a better plan because I learnt that for 100% of concentration the reaction takes place quite quickly there for watching the stop watch had to be done very quickly but correctly. Plan: The apparatus that I will be needing for experiment and why: 3. 5cm of magnesium ribbons to react with HCL Stop watch to measure how long it took for the magnesium ribbon to stop reacting. Hydrochloric acid (1m) to react with the magnesium ribbon Measuring cylinder to measure the concentration of H20 and HCL Pipette to measure smaller concentrations of H20 and HCL Retort stand to hold the syringe Conical flast for the reaction Thermometer to measure room temperature Syringe to measure the volume of hydrogen produced Ruler to measure 3. 5cm of magnesium ribbon Scissors to cut the magnesium ribbon Distilled water to add with the concentrations of HCL Sand paper to sand the magnesium ribbon 1. I will firstly collect all the equipment needed for my experiment, then measure them to the exact measurement. I will start with 100% concentration of hydrochloric acid which will contain no distilled water and 10ml concentration. I will then measure my magnesium ribbon to 3. 5cm and sand it 8 times on each side making sure it is fair. Using the measuring cylinder and pipette I will put my hydrochloric acid into the conical flask. 2. To ensure that the magnesium ribbon doesnt get stuck I will coil the magnesium ribbon with a clean sterilised ruler. 3. I will then attach the syringe onto the retort stand. Then I will attach my conical flask with the syringe. 4. Because I want this test to be fair I cannot do it on my own so my partner will start the stopwatch as soon as I drop the magnesium ribbon into the hydrochloric acid. Then I will seal the conical flask with the cork. 5. Every 10 seconds my partner will tell my the time on the stop watch and then I will look at the syringe to see what the volume of gas produced is. I will note this down very quickly. 6. After the reaction has fully stopped. I will empty the conical flask, then start the same process again but for 80% concentration which is 8ml of hydrochloric acid and 2ml of distilled water. This process will happen for all 5 concentrations. 7. After experimenting all 5 concentrations I will repeat the same process 3 times to ensure my results are fair and reliable. Keeping my experiment fair: making sure all equipment is clean from unwanted substances. sanding the magnesium ribbon same times on each side. hile my partner starts stop watch, I quickly drop magnesium ribbon so it is done at the same time. Use the same length of magnesium ribbon, checking it is exactly 3. 5cm. Safety issues:aking sure I wear my goggles at all times. Tying hair up. Tuck in stalls, and stand up during experiment. Making sure I handle all the equipment correctly. If there is any spillage, quickly wiping it with paper towels. Obtaining evidence: 100% Time (sec) Volume 1 Volume 2 volume 3 Average 1.To find my average number of hydrogen produced I added the 3 volumes together then divided by 3. The answer most close I decided was my average. Show preview only The above preview is unformatted text This student written piece of work is one of many that can be found in our GCSE Patterns of Behaviour section.

Historical Themes of Garcia Marquezs One Hundred Years of Solitude

Historical Themes of Garcia Marquez's One Hundred Years of Solitude  Ã‚      Garcia Marquez has said that "One Hundred Years of Solitude is not a history of Latin America, it is a metaphor for Latin America" (Dreifus 1983:1974). The historical themes include conquest and colonization, settlement and scientific discovery, civil wars, foreign economic intervention, technological change, and finally the decay and disappearance of a long-established way of life. The original Spanish conquest is alluded to when, in the first chapter, Jose Arcadio Buendia finds an old suit of armor and the remains of a galleon, mysteriously stranded several kilometers from the sea. The early Spanish colonization and the devastating pirate raids of the English sailor, Sir Francis Drake, are referred to in the second chapter. Subsequently, no more is made of this theme. Pioneer settlement is the real beginning of the story of Macondo. It is at first "a village of twenty houses of mud and canestalks on the bank of a diaphanous river. . . . The world was so new, many things did not have names, and to mention them one had to point with a finger." (71) Just so: when the real pioneer families made their first crude homes in the forests of the Americas, they found many things-plants, animals, minerals - they had never seen before and for which they had no names. That was one reason Europeans referred to the western hemisphere lands as the New World. Typical of such villages, which were established on the banks of rivers in all the Spanish territories, Macondo is governed by its founder, Jose Arcadio Buendia, as a kind of village chief; Ursula, his wife, cultivates a little plot of land and the men, apparently, also hunt for food (although hunting is n... ...very rapidly. In real history, this is the period of the world-wide economic depression that began in 1929 and lasted a decade, until the beginning of World War II. Then, in the last chapter, when the last Aureliano finally leaves the house that has been his prison, we seem to be in a new kind of Macondo. There are more people around, including several who are quite unlike any we've met before and seem unrelated to the old families of Macondo. What sort of town is this that has an eccentric Catalan dealer in rare books frequented by a group of eager young writers? The town also has a drugstore, which we have never heard about before, attended by an Egyptian-eyed girl named Mercedes. It also has some new and extravagant brothels. Works Cited: Garcia Marquez, Gabriel. One Hundred Years of Solitude. Trans. Gregory Rabassa. New York: Harper Perennial, 1991.

Economic Development In Urban Areas

Economic change has helped lead America into urban crisis for the following reasons. First of all, because urban problems are no longer confined to the inner city, but are regional in nature. The federal government has, also, largely drawn from the urban policy arena, thereby having cities and sates to develop their own solutions to local problems. Furthermore, the economy of cities is no longer organized around a central business district, but is dispersed throughout a metropolitan region. Next, the national economy has experienced a fundamental reorganization and many cities have experienced the direct effects of deindustrialization and disinvestments. Additionally, the fiscal crisis within the public sector is unprecedented and has seriously negative effects for the provision of services at all levels of government. Finally, the nature of work itself has changed within cities as more women enter the labor market; the changing nature of work has affected the urban family in many ways, many of which have direct ramifications for social welfare and family policies. There is a great amount of inequality of income in some cities. Most of the those who fall bellow the poverty line are African Americans and Hispanics. This is because they are placed in low paying jobs. As more and more people immigrate into the country, there are less and less jobs to go around. This creates a larger poverty gap. People just coming here to America are placed in very low-income jobs. This is all they can get if they don’t speak any English. For example, here at Rider the cleaning people are all Spanish. They don’t speak any English, and their job is to be the cleaning crew. These are the only types of jobs that these people can get most of the time, and this makes our percentage of people who are in poverty go up. Another problem that is contributing to the urban crisis is the rise of single-parent families and ‘present-orientated’ values. The problem here is that the divorce rate in America is getting higher and higher, and also the amount of children being had out of marriage is greatly increasing also. This creates one parent raising a child. The problem here is that there is no proper care for children in this situation. The parent has too much responsibility. They are to provide for the family, as well as adequately care for their children. When the single parent has to go to work, to get money to pay for a place to live, food, and clothing, there leaves no time to watch and take care of the children, meaning children are left to take care of themselves after school is over, and this results in a lot of problems for the communities. These children cause trouble. They are the ones who commit most crimes in an urban environment. This is why in an urban city there is a lot more crime. There are a lot of children left unsupervised for most of the day and night. Another problem is the ethnic tensions that there are in America. There are many things that are wrong with this. The first problem is that because of racism, people are secluded. They are pushed to all live together, because people don’t want to live next to them. This is how a ghetto is started, and slums. All the people of low incomes live in the same neighborhood together. They also contain the high crime rates because these are the people who are also of single parent families and their children are left unsupervised. Another problem with racism is that people are given lower paying jobs because of their race, and also, they aren’t able to have to same amount of experience as other people. They don’t go to as good of schools, and they then might not be able to go to college, so they are stuck. They can only get a low paying job. This creates families to be stuck in poverty for generations, they can never get out, unless with government assistance of some sort. Then this makes the inner cities all full of low-income families, and creates a poverty stricken area that cannot be fixed in any way. If there were more integration within neighborhoods, then we wouldn’t have these areas. Another reason why urban America is in crisis is because of the underground urban economy. This also causes a lot of crime in urban cities. The people in these cities who are poor, and are trying to find a way out, usually try by doing something illegal. A big example of this is drug sale. People start selling drugs to get money. This creates a lot of problems. The selling of illegal materials results in murders, and robberies, to either get the drugs, pay for the drugs, or avoid getting caught selling them. Another example of this is people stealing things, like car parts, and selling it on the black market. All of these illegal acts always result in something that makes the cities look worse and worse to live in. I know that when I go into Trenton I am really afraid, because I know that there is a really high amount of crime there, and I am always thinking that someone is going to try to shoot me for my car, rob a store that I am in, or something else. Stereotypes of cities are easily created, and this doesn’t help the situation. Also, the advancement in technology has lead many people to be left without jobs. This technology had created more unskilled labor, and putted skilled labor to a minimum. People, who had been specialists at doing certain skilled work, are constantly being replaced by machines that can do the same work faster and cheaper. This creates a huge economy gap. It makes the rich get richer and the poor get poorer, by giving all the money from the profit of sales to the company owners, rather than to employees. So, the people who were already well off, have even more money, and those people who were middle class citizens are now jobless, and can not afford to take care of their families. The problem here is obvious, the more jobs that are lost because people are replaced by machines, the greater the amount of people who become in poverty. The numbers keep increasing.

Sophocles Oedipus The King - 1714 Words

The renowned Greek philosopher, Aristotle, is widely known for his theories in mathematics, physics, and politics. However, he is also known for establishing ideas in the field of literature, such as the concept of tragedy and the theory of the importance of scenes of recognition and reversal. This ancient concept and theory are still highly discussed and used to analyze numerous pieces of literature to this day. One piece that could be considered as an â€Å"ideal tragedy† is the play â€Å"Oedipus the King† written by Sophocles. In this play, Sophocles utilizes the concept of tragedy as well the theory of the importance of scenes of recognition and reversal to create a setting, tone, and mood throughout the play. Oedipus, the mythical king of†¦show more content†¦An example of the use of fear to bring emotion to the reader in â€Å"Oedipus the King† is when the city of Thebes is suffering from a plague that destroys fields of crops as well as the ferti lity of its woman. â€Å"A blight is on the fruitful plants of the earth, a blight is on the cattle in the fields, a blight is on our women that no children are born to them; a God that carries fire, a deadly pestilence, is on our town (Sophocles 26-30). At the beginning of the play when Oedipus is asking the people of Thebes why they are sitting in front of his palace, a Priest explains that there is a plague going on in the city and they want an end to it. It is later known that the plague will never end until the murderer of Laius, the king of Thebes before Oedipus, is found. Oedipus vows to find the murderer, which eventually leads to him finding out he was the one who killed his father and married his own mother, thus fulfilling his fate. This extracts pity from the reader, for all the character tried their hardest to run from the prophecy but in the end, it still catches them. Lastly, tragedy can be seen throughout the entire play, as readers see the steady downfall of a hero , who was heavily influenced by his hubris or pride. Aristotle’s ideal tragic hero is one the must exceed the average man intellectually, physically and mentally. Oedipus not only travels throughout the city defeating numerous foes, but eventually becomes the king of Thebes. Not only that, according to