UV-vis works Essay Example for Free

UV-vis works Essay Even though I accidentally spilled most of my product while pouring it into the separatory funnel, the product left was identical to everyone elses by comparison of the UV-vis spectrum.  Discussion  One possible source of error in this experiment occurred when I spilled the product. Although a small amount of it remained in the beaker, I decided to pipet the  spilled product off the desk to save as much as I could in order to complete the experiment. At first I thought this might cause my product to be somewhat impure, but after looking at the UV-vis spectra, it was obvious this had no effect on the outcome. My spectrum looked perfectly fine. Conclusion UV-vis can be very helpful in finding out how pure your product is and what the components are by looking where the absorption bands are and the extent to which the components were absorbed. UV-vis works by electrons moving from the ground state to a higher excited state. The types of transitions possible are. The sigma to sigma star transitions take place at 200-700 nm and are usually not seen in UV-vis spectrum. N to sigma star transitions require less energy than sigma to sigma star transitions and occur at 150-250 nm. The last type of transitions occur between 200 and 700 nm and are the type which occur in the Cu(TTP) spectrum. Peaks that are shifted to shorter wavelengths caused by transitions are named blue shifts. The peaks that are shown in our Cu(TTP) spectrum are caused by transitions and are classified as red shifts. This is caused by attractive polarisation forces between the solvent and the absorber, which lower the energy levels of both the excited and unexcited states. This effect is greater for the excited state, and so the energy difference between the excited and unexcited states is slightly reduced resulting in a small red shift. This effect also influences   transitions but is overshadowed by the blue shift resulting from solvation of lone pairs (UV-vis Absorption http://www.shu.ac.uk/schools/sci/chem/tutorials/molspec/uvvisab1.htm) Questions and Answers 1. Why does Cu(TTP) elute before H2TTP? The copper would elute first. The reason for this is because of the acidity of the hydrogen atoms. Since the hydrogens are acidic, they want to hold onto the silica gel, which will cause them to elute after a longer time period.  2. The rates at which compounds elute from a silica gel column depend on any pretreatment of the silica gel. In which case would a compound elute faster: down a column made of silica gel that had been previously heated at 150 degrees Celsius under vacuum for 8 hours, or down a column made of silica gel that had been sitting open in the laboratory for a few days? Explain. When you heat silica gel, water evaporates off the gel leaving open sites where polar molecules can bond. When you let silica gel out in the open, it will collect water molecules on it. Compounds would elute faster down a column that has been heated at 150 degrees for 8 hours because the gel would be dry.  3. A mixture of cis and trans isomers of the neutral complex Cr(CO)4[P(C6H5]2 is loaded onto a silica gel and eluted with CHCl3. Which isomer would elute first, and why? The trans isomer would elute first. References Skoog Douglas; Holler F. James; Nieman Timothy A., Principles of Instrumental Analysis, fifth edition, Thompson Learning: 1998.  Quinn 6  UV-Vis Absorption Spectroscopy-Theory. http://www.shu.ac.uk/schools/sci/chem/tutorials/molspec/uvvisab1.htm.

Othello :: essays research papers

Othello. Othello is the title of the character and play that we all studied earlier this semester. However, it is Othello the character that I intend to discuss. Othello is the husband to the beautiful and innocent Desdemona, whom he murders because the villainous and honest Iago has misled him. A Moorish general in Venice, a society plagued with racism and where adultery is neither condemned nor approved of, Othello is in the midst of a society that will hinder and not support his progress. The central theme of the drama is the alteration of a noble lover to a raving killer, under the influence of the deliberate connivance of his aide, Iago, who convinces him that his wife is having a love affair with another officer named Cassio. Unable to trust the falsely corrupted Desdemona - he lacks the essential element of love and it is this absence of trust that causes Othello to disintegrate morally. This destructiveness extends to his own suicide, when his error of judging Desdemona to be an adulteress fails him. Our closely woven relationship with this traumatised and gullible Othello causes us to suffer with him, as he experiences emotional agonies, such as the destruction of his once reputable nobility, character and marriage to the young Desdemona. Through Act II, Scene I, Othello presents himself to us as a grandly positive and content character, "It gives me wonder great as my content To see you here before me. O my soul's joy!" (Act II, Scene II). At this stage in the play Othello has also assembled his character to impose on us an impression, that he is a noble and prominent figure in the Venetian establishment, and respected military man and a loving husband. He carries himself with an impressive dignity while frankly delighting in his young wife's unconditional love, which he values above the "seas worth", (Act II, Scene I). When the couple defend their marriage against the prejudiced Brabantio, father to Desdemona, who associates Othello with witchcraft, (because Othello is black), in Act I, Scene III, it becomes evident that the couple share an unconditional love for one another. However, in the second half of the play Othello abandons this perfect love, for a blind and unfounded jealousy too strong to act in a just manner. He loses all faith not only in Desdemona, but especially himself, "That's he that was Othello; Here I am.

Flood Measuring System Essay

This chapter includes a brief overview on experimental research and the process that led to the selection of the research design used in this study. Additional topics addressed in Chapter 3 are: research locale, and instrumentation. Research Design An experimental type of methodology was used to conduct this research. An experimental method of research is a systematic and scientific approach to research in which the researcher manipulates one or more variables, and controls and measures any change in other variables(http://explorable.com/experimental-research.html). The method is appropriate to this study since it aims to overcome the present condition of our country, specifically the areas near Pamantasan ng Lungsod ng Maynila during rainy days. The technique that the researchers will use under experimental method is developing a device that monitors the height of the water using sonar sensor and sends it to the server by the means GSM module. Then the data received by the GSM will be sent to the application created for android phones via internet. The purpose of employing the experimental method is to overcome the present condition of the areas near Pamantasan ng Lungsod ng Maynila during rainy days. The researcher opted to use this kind of research considering the desire to acquire data from the device that the researchers developed so as to formulate rational and sound conclusions and recommendations for the study. Block Diagram Flood Monitoring Unit Server Android Application Research Locale The researchers will conduct the study to three different areas near Pamantasan ng Lungsod ng Maynila, these areas are selected to inform the students of the said university if the route they will take is still passable or not. Instrumentation An instrument was developed to monitor the flood in three different areas near Pamantasan ng Lungsod ng Maynila. This section will discuss the instrument and its development. The first step in developing the instrument was to make a prototype that will monitor the height of the flood on the said areas. It consists of a sonar sensor, Gizduino and GSM module. The sonar sensor is enclosed in a container with a hole at the bottom that will sense the height of the water measured in inches. It detects the height of the flood with respect to the ground as its basis. The maximum flood level itcan detect is six feet which is equivalent to 72 inches and it only reads data in whole number. It is SIM dependent.The GSM module will send the data gathered to the server. Then the server will analyze the data and relays it to android applicationvia internet. The following will be the list of materials to be used in constructing this project. 1. Microcontroller The Gizduino is a microcontroller board based on the ATmega328 and ATmega168. It has 14 digital input/ output pins, 6 analog inputs, a 16 MHz crystal oscillator, a USB connection, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started. it is an open source computing platform based on simple input/output (I/O) board and the use of standard programming language; in other words, it is a tool for implementing a program you have designed. Gizduino is programmed using the IDE (Integrated Development Environment). Gizduino is ideal for beginner programmers and hobbyists because of its simplicity compared to other platforms. It is a multiplatform environment; it ca run on Windows, Macintosh, and Linux. It is programmable via USB cable, which makes it more accessible and allows communication with the computer FEATURES & SPECIFICATIONS †¢ Microcontroller: ATmega168 or ATmega328 †¢ User Interface: USB Port, DC Jack, ResetButton, ICSP Port, Shield Connection Port †¢ Debugger Port: ICSP †¢ Power Input: External:8V-12V USB:5V †¢ DC Power Output: 3.3V †¢ PCB Size: 2.7 x 2.1 inch †¢ On-board Crystal: 16MHz and 12MHz 2. Sonar Sensor A US-100 Ultrasonic Sonar isa low cost compact ultrasonic sonar (distance measuring) sensor with up to 3.5-meters range. A host microcontroller circuit determines distance by triggering the US-100 and then measuring the echo time indicated by the pulse width output of the sensor. Temperature compensatured for accurate ranging even on varying ambient temperatures. FEATURES & SPECIFICATIONS †¢ 40KHz Ultrasonic sonar †¢ 2cm – 350cm sensor range (Temperature compensated) †¢ TTL Trigger input †¢ TTL Echo output 3. GSM Module GSM/GPRS module is used to establish communication between a computer and a GSM-GPRS system. Global System for Mobile communication (GSM) is an architecture used for mobile communication in most of the countries. Global Packet Radio Service (GPRS) is an extension of GSM that enables higher data transmission rate. GSM/GPRS module consists of a GSM/GPRS modem assembled together with power supply circuit and communication interfaces (like RS-232, USB, etc) for computer. GSM/GPRS MODEM is a class of wireless MODEM devices that are designed for communication of a computer with the GSM and GPRS network. It requires aSIM (Subscriber Identity Module) card just like mobile phones to activate communication with the network. Also they have IMEI (International Mobile Equipment Identity) number similar to mobile phones for their identification. A GSM/GPRS MODEM can perform the following operations: 1. Receive, send or delete SMS messages in a SIM. 2. Read, add, search phonebook entries of the SIM. 3. Make, Receive, or reject a voice call. FEATURES & SPECIFICATIONS †¢ Quad Band GSM/GPRS †¢ Text and PDU Mode †¢ TCP/IP stack †¢ GPRS class 10: max 85.6 kbps downlink †¢ Standard AT Commands (GSM07.07, 07.05, & SIMCOM enhanced AT commands) †¢ Analog audio port †¢ UART (TTL) serial port †¢ Debug Port †¢ RTC backup †¢ Charger interface

The Presidential Election Of 1912 Essay - 1664 Words

Presidential Election of 1912 In the presidential election of 1912 the Democrat Woodrow Wilson, Progressive Theodore Roosevelt, Republican William Howard Taft, and Socialist Eugene Debs all had their opposing views on the issues that concerning the future of democracy in America. Some of the issues were; the Conservation of Natural Resources, Direct Democracy, Labor, Race, Tariff, Trusts and Regulation of Business, and votes for Women. Majority of the people desired change, as would I if I were to have lived during this time period . My vote would have been for Theodore Teddy Roosevelt, as the change he promises is fair compared to the other candidates. Labor would be one of the issues that would be most important to me as a voter. Working is part of life, it s necessary to be able to provide for your family. In 1912, the working conditions were not safe or healthy. The long working hours, the dangerous work space, the low pay all would make people desire change. As a voter, I would want to know that in the future I would be safe at work with good pay to be able not to live in poverty. There were many strikes that occurred, demanding change in labor in 1912. In the Lawrence Strike, â€Å"people fought for higher wages, shorter hours, safer working conditions, regulation of woman and child labor, and workmen s compensation.† Another issue that would be important to me as a voter would be the tariff. The Tariff is a source of federal revenue. It’s a way for the United StatesShow MoreRelatedThe Presidential Election Of 1912888 Words   |  4 PagesThe presidential election of 1912 was fought amongst four major candidate s. Woodrow Wilson was brought up by his father, a Presbyterian minister, and his mother, daughter of a Presbyterian minister brought up Woodrow Wilson. He was president of Princeton University and governor of New Jersey. He represented the Democratic Party and had a combination of high morality and high-minded detachment. Eugene Debs was a well-known Socialist and union man for the Fireman’s Brotherhood and American RailroadRead MoreEssay about 1912 Election1032 Words   |  5 PagesThe Effects on American Politics From the Election of 1912 During the Progressive Era, Americans faced the challenge of choosing between four strong candidates of the election of 1912. Each candidate held concrete platforms that would have different effects on progressivism. Americans could chose the conservative presidential incumbent William Howard Taft(R), the New Jersey governor Woodrow Wilson (D), the long-time fighter for social reform-Eugene V.Read MoreThe Election of 1912 Essay1054 Words   |  5 PagesThe Election of 1912 During the Progressive Era, Americans faced the challenge of choosing between four strong candidates of the election of 1912. Each candidate held concrete platforms that would have different effects on progressivism. Americans could chose the conservative presidential incumbent William Howard Taft(R), the New Jersey governor Woodrow WilsonRead MoreThe 1912 Crucial Election1346 Words   |  6 PagesThe year 1912 brought one of the most important presidential elections in United States history. Four nominees confronted one another during this election: Democratic candidate Woodrow Wilson, Progressive leader Theodore â€Å"Teddy† Roosevelt, Republican William Howard Taft, and Socialist Eugene Debs. This election also proved to be crucial as it brought forth new considerable and â€Å"substantive† discussions concerning the Union and its future. These issues included, whether government should expandRead MoreProgressive Era Dbq792 Words   |  4 Pageswere found being s hoveled into receptacles from dirty floors where they were left to lie until again shoveled into barrels†¦Ã¢â‚¬  stated the report. This caused Congress to pass the Pure Food and Drug Act and Meat Inspection Act. With the election of Woodrow Wilson in the 1912, he sold his idea of â€Å"new freedom†. As stated in the Clayton Antitrust Act of 1914, â€Å"It shall be unlawful for any person engaged in commerce that directly or indirectly discriminated in price between different purchasers†¦Ã¢â‚¬  â€Å"The effectRead MoreTheodore Roosevelt And The United States907 Words   |  4 Pagesinspirited him to build up his body with strenuous exercises and sports in efforts to build his body and mind. In 1876, Roosevelt was accepted to Harvard College. After graduating, he decided to enter politics and in 1881, at the age of 23, he won election to the first of three terms in the Incipient York State Assembly as a Republican. In 1889, Roosevelt was appointed to the U.S. Civil Accommodation Commission and then in 1895 appointed to the post of N.Y. City Police Commissioner. As Police CommissionerRead MoreWoodrow Wilson Presidency : Election Of 19121080 Words   |  5 PagesPRESIDENCY Election of 1912 The election of 1912 involved four candidates: Democrat Woodrow Wilson, Republican William Howard Taft, Socialist Eugene V. Debs, and Progressive Theodore Roosevelt. The two major candidates in the 1912 election would be Roosevelt and Wilson. Wilson’s proposal of New Freedom engaged his supporters. The New Freedom notion intended to eliminate all trusts instead of just regulating them in hopes of an economic competition restoration. On the day of the Election in 1912, WilsonRead MoreTheodore Roosevelt And The Progressive Party987 Words   |  4 PagesIn 1912, the Progressive Party formed to support Theodore Roosevelt in his attempt to be elected for a third presidential term (O Toole par. 7, 11). The party was formed after the Republican National Convention repudiated the nomination of Roosevelt (Bardes, Shelley, and Schmidt 251). Furthermore, this resulted in Roosevelt splitting the Republican vote between him and William Howard Taft and gave Democrat Woodrow Wilson an adva ntage (Bardes, Shelley, and Schmidt). The Progressive Party took a platformRead MoreTheodore Roosevelt . Introduction To The Life Of Theodore1574 Words   |  7 Pagesgovernor, it was clear to them that he had no interest in listening to their ideas or following their ways. This would lead Roosevelt into becoming the running mate for McKinley in the presidential election, in hopes of preventing a second governor term for the once loved war hero. McKinley would go on to win the election and Roosevelt would become the Vice President, but this was short lived. On September 6, 1901 McKinley was tragically shot and killed. Roosevelt would now become the 26th presidentRead MoreCommitment Of The Individual Essay1000 Words   |  4 Pagesinto the hills of Maine, defying guides and his own health to overcome natures trials. By this information, we can glean where this man got his motivation in the political career, ending with his loss to Wilson in 1912. This determination was what carrie d Roosevelt through the election and into the Amazon. These self-imposed ordeals have a profound impact as to how Theodore lived. That commitment to achieve is very important to success in whatever you do. I find this to be the most important aspect