The rate of a chemical reaction Essay Example for Free

The rate of a chemical reaction Essay The equation for resistance using resistivity is Resistance = resistivity x length / area of cross section of the wire The resistivity of Nichrome at 250C is 100 x 10-8 ohm-m. The radius of the wire isResistance = resistivity x length / area of cross section of the wire Resistance = 100 x 10-8 x 0. 4m / 6. 16m2 x 10 -8 Resistance = 6. 49 ? rounded 2 d. p. TPlan Aim I aim to find out if the length of a Nichrome wire affects the resistance. Safety To ensure this experiment is safe I will:  Ensure that the power pack does not exceed 2 volts in case the wires overheat.    I will also only leave the power pack on for short amounts of time so the wire does not overheat. I will not perform the experiment in a wet area because water is a very good conductor of electricity and so this would be very dangerous.   I will not touch the wire once the power pack is switched on because the current will heat up the wire. Factors to control The independent variable will be: 1 The amount of resistance in different lengths of wire. The variables that I will keep the same will be: 2 Width of wire- I must keep the wire a thickness of 32SWG. If I change the width of the wire the resistance will change because there is more resistance in a thicker wire because there are more fixed ions so there are more collisions in the wire and more successful collisions means the resistance will increase 3 Material of wire- different materials will affect the amount of free electrons that are able to move through the wire. If there are more or larger atoms then there will be more collisions. This causes the voltage of the wire to increase causing a higher resistance. Also if the atoms in the material are more closely packed then the electrons will have more frequent collisions and the resistance will increase. I will use Nichrome only. 4 Density of wire- In a higher density wire there will be a higher resistance because there will be more fixed ions and more collisions. 5 Temperature of wire- If the wire is heated up the atoms in the wire will start to vibrate because of their increase in energy. This causes more collisions between the electrons and the atoms as the atoms are moving into the path of the electrons. This increase in collisions means that there will be an increase in resistance. 6 Shape of wire- the wire will be straight and taped to a meter rule, the shape of the wire may increase the resistance. 7 Voltage of 2 volts- I will have to keep a constant voltage because if the voltage changes then the resistance will change. The equation for resistance = voltage / current. If voltage increases, resistance increases. Apparatus The apparatus I will need to perform this experiment will be: 1 Power pack (2volts) 2 Ammeter 3 Voltmeter 4 6 wires 5 2 crocodile clips 6 Meter rule 7 Masking tape 8 Board marker Circuit diagram Method I have chosen to take a range of 10 lengths. I have chosen a range of 10 as to plot an accurate graph I will need at least 10 points to mark on the graph. The lengths that I have chosen are as follows: 10cm, 20cm, 30cm, 40 cm, 50cm, 60cm, 70cm, 80cm, 90cm and 100cm. I have chosen these lengths because the meter ruler can easily measure them and enough results to make a firm conclusion. To change the length of the Nichrome wire during the experiment I will tape down 1 meter of Nichrome 32 swg wire to a meter rule. I will then connect the 2 crocodile clips different distances apart using the measurements on the meter rule. The wire will be attached at X in the circuit. In my experiment I will find the current in the circuit using an ammeter and I will find the voltage in the wire using a voltmeter. I will take these two readings so I can then calculate the resistance using the equation resistance = voltage / current. I want to make my experiment as accurate as possible so I want to produce repeat readings so that I can find an average resistance. I will be using a variable resistor in my experiment to produce these repeat readings. I will draw 4 equally spaced points on the variable resistor with a board marker. To get my repeat readings I will move the variable resistor to these 4 points and get four readings for each length. After I have found the average resistance for each length of wire I will produce a graph showing the average resistance against the length of the wire. I will draw on my graph a line of best fit and then from this I will be able to see if my prediction was correct and if the resistance does increase when the length of wire increases. 1. Set up a circuit as shown above. Set the power pack at a constant voltage of 2 volts. 2. At X in the circuit the wire will be placed. I will first connect the crocodile clips 100cm apart. Then turn the voltmeter and ammeter on and ensure the variable resistor is set at the first point. 3. Now turn on the power pack and record the first results shown on the ammeter and voltmeter. I must take the first results because the results may change due to overheating if the power pack is left on. Now turn off the power pack. 4. To take my repeat reading of 100cm I will then move the slider on the variable resistor to the second marked point. I will now turn on the power pack and record the first result shown on the ammeter and voltmeter. 5. I will continue taking my repeat readings and moving the variable resistor along and recording the results for 100cm. 6. I will then change the length of wire to 90cm by moving the crocodile clips and i will set the variable resistor at the first point. Then I will turn on the power pack and record the first set of results. I will take 4 repeat readings for each length of Nichrome wire. 7. I will record 4 repeat readings for each length of Nichrome wire until I have results for all 10 lengths. Results table Length (cm) Repeat number Voltage (volts) Current (amps) Resistance (? ) Average 17. 82 I have put in bold any anomalous results. Analysing and considering evidence Conclusion From my graph I can tell that my prediction was correct. As the length increases the resistance increases, a piece of 20cm wire has a resistance of 3.8 ? and a piece of 30cm wire has a resistance of 5. 6 ?. This is because a longer piece of wire has a higher resistance because in a longer piece of wire there are more collisions between the electrons and the metal ions. In every successful collision energy is lost from the electron to the wire ions. The result is that the voltage of the wire increases. Because the equation for resistance is resistance = voltage / current, the resistance then increases. From my line of best I can also tell that as the length doubles the resistance always almost doubles too. A piece of 20cm wire has a resistance of 3.8 ? and a piece of 40cm wire has a resistance of 7. 4 ?. Double 3. 8 ? is 7. 6 ? this is almost double but not quite probably because my experiment was not quite accurate. A piece of wire 30cm long had a resistance of 5. 6 ? and a piece of wire 60cm long has a resistance of 11. 1 ?. This is also almost double, double 5. 6 ? is 11. 2 ?. The resistance doubles as the length doubles because there can be double the amount of successful collisions so double the amount of energy is lost causing the voltage to double and so the resistance doubles. Key Electron Metal ion Predicted results Length (cm) Predicted resistance ( ? ) Actual resistance ( ? ) Difference (ll of my results were quite close to my predicted results but as the length increases my predicted resistances become less accurate. This could have been for several reasons that are mentioned in my evaluation but probably as my experiment went on the wire overheated so my results became less accurate. Evaluating My method of collecting my results worked quite well. I gained the results I expected from my experiment. The quality of my evidence was good. My line of best fit went through almost all of my points on my graph and was quite similar to my predicted line of best. I did have some anomalous results. When I experimented with 10cm of Nichrome wire my fourth repeat readings was quite different to the other readings. It had a resistance 0. 87 ? that was the lowest repeat readings for 10cm. The second lowest was 1. 80 ? , this is quite a lot more than the anomalous result. When investigating which 30cm of Nichrome wire I had another anomalous result that was 6. 48 ? , the third repeat reading. This was the biggest repeat reading. The second largest was only 5. 89 ?. This could have been because: I left the power pack on too long. This causes the wire to overheat.   When I was measuring the lengths of the Nichrome wire my measurements might have been slightly inaccurate. The rulers used might not have been exact and it was difficult to get an accurate reading of length by eye as the wire was not completely straight. Also the ruler may have been of different thicknesses throughout the length. This would have contributed as a slight error in my results.   The ammeter and voltmeter could have been slightly faulty and not given me correct, accurate readings.   I connected the wire into the circuit using crocodile clips. These were quite loose and so this could have made my results less accurate. If I improved my method I could either attach the wires with tape but this may affect my results so instead I could solder the Nichrome wire into my circuit. It was difficult to adjust the variable resistor slider accurately only by eye. If I did the investigation again I could try to and adjust the variable resistor accurately I will use an advanced digital variable resistor.   I also found it difficult to measure exact lengths against the meter rule because the crocodile clips didnt clip on to the wire very securely. If I did the investigation again I could pre cut all the lengths of wire before the experiment instead of just connecting the crocodile clips at different distances apart on the meter rule. To further my investigation I could use the same method but increase the range of lengths. I could use lengths of up to 3 meters. I could take readings from lengths at smaller intervals; I could take reading every 5cm instead of every 10cm as I did. I could also take more repeat readings to get a even more accurate 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 Electricity and Magnetism section.

Supernatural in Shakespeare’s The Tempest And Marlowe’s The Tragical Hi

The Supernatural in Shakespeare’s The Tempest And Marlowe’s The Tragical History of D. Faustus The supernatural forces are at once alike and distinct in Shakespeare’s The Tempest and in Marlowe’s The Tragical History of D. Faustus. The supernatural is kind to Prospero and his daughter Miranda in The Tempest, while the devils in Dr Faustus eagerly wait for the day that Faustus would join them in Hell. In both plays, the supernatural provides recurrent waves of sounds and feelings, lending special atmospheric qualities to The Tempest and Dr Faustus. The supernatural serves as a reminder of the hierarchies that exist in both plays, and it also illuminates the human heart, revealing the characters’ thoughts and wishes. Often appearing visible to all, the supernatural forces in The Tempest and Dr Faustus sustain the plays by providing a distinct atmospheric backbone, by reminding the characters of the existing hierarchies, and by revealing the characters’ inner hearts. Soaked in the supernatural, Shakespeare’s The Tempest possesses an impenetrable veil of eeriness. It opens with the tempestuous roaring of thunder and lightning, setting the stage for panic and confusion amongst the mariners. The mariners scatter and hide, while Ferdinand’s hair stands on end. This wild and surreal atmosphere prepares the characters and the audience for future encounters with supernatural beings. When the spirit Ariel wakes Gonzalo and the others, Gonzalo says, â€Å"’Tis best we stand upon our guard, or that we quit this place. Let’s draw our weapons† (II.i.317-318). The mortals are on guard against the supernatural, and this suspenseful atmosphere often returns when Ariel and the other spirits approach these unknowing men. When Prospero remembers ... ...ory of D. Faustus are about the relationship of the two worlds. By creating an eerie and sometimes humourous atmosphere, the supernatural gives the plays points of interest. The existing hierarchies between mortal and immortal are not to be destroyed, and the supernatural beings in these two plays reinforce the rules. By revealing the characters’ hearts and minds, the supernatural drive the plot as well as the actions of the individual characters, so that without these beings, these two plays would grind to a standstill. WORKS CITED Marlowe, Christopher. The Tragical History of D. Faustus. In Renaissance Drama: An Anthology of Plays and Entertainments. Edited by A.F. Kinney. Massachusetts: Blackwell Publishers Ltd., 2002. Shakespeare, William. The Tempest. The Norton Shakespeare. Ed. Greenblatt, Stephen. New York: W.W. Norton & Co. Inc., 1997. 3055-3107.

Enterprise Architecture at American Express Essay

Critical facts American Express, located in New York City, was founded in 1850 (Corporate Profile, 2015). It is one of the 30 companies in the Dow Jones Industrial Average (Corporate Profile, 2015). American provides services such as credit cards, charge cards, and traveler’s checks (Corporate Profile, 2015). American Express cards account for 24% of credit card transactions in the U.S. (Corporate Profile, 2015). According to the company’s 10k, the company generates $33 billion in revenue and over $5 billion in income. The company’s total assets are over $150 billion. American Express has one of the largest IT infrastructures and is able to handle an extremely high number of transactions each second (Demirkan, 2006). In 2011, the company won the first annual InfoWorld/Forrester Enterprise Architecture Award for its EA initiatives (Knorr, 2011). American Express chose to use an Enterprise Architecture (EA) as their IT framework that aligned their business and organizational needs to their information technology. Enterprise architects were the employees responsible for using this framework to continuously make their processes more efficient and utilizing their IT/IS to the fullest extent (Pearlson and Sanders, 2013). Analysis I will be analyzing the success of American Express’s Enterprise Architecture, how Zachman Framework is used to structure the EA, and how this improved their existing service-oriented architecture (SOA). Changes in the way that mobile payments were being used by their clients, the company had to be flexible and adapt to the transformation. New delivery channels required American Express to adjust their prior time-to-market guidelines for payment services (Pearlson and Sanders, 2013). The company turned to its Enterprise Architecture (EA) to guide them through the current market conditions. The opportunity that American Express saw was to use EA to meet the demands for a hastily changing environment. EA is a complex framework of rigid standards for developing an IT architecture and infrastructure that provides a design of how the IS of a company relates to the businesses and processes  (Pearlson and Sanders, 2013). The architecture analyzes a great deal of the company, identifies core processes and how they work together, and then organizes how business units will interact and how IT will provide support (Pearlson and Sanders, 2013. The EA includes the Core business processes, shared data, linking/automating technologies, and customer groups (Pearlson and Sanders, 2013), with key components like the ability to do business effectively while utilizing new payment methods and mobile devices (Knor, 2011). Though an EA can help organize a company in a meaningful way, there are also potential drawbacks, which are discussed below. Zachman Framework is a tool that can be used to obtain the knowledge about itself with Enterprise architecture. It is a logical structure that classifies and organizes the descriptive representations of an enterprise (Pereira, Marques and Sousa, 2004). The framework integrates and aligns the IT infrastructure and business goals (Nogueira etc. al, 2011). Whereas an EA is used to document and develop the organizational data for American Express, the company uses the Zachman framework methodology to implement the EA. Zachman proposed the framework for IT architecture so that all of the IS architectures are depicted from top to bottom. It uses a matrix to provide a standard to ensure information environments are properly integrated (Nogueira etc. al, 2011). The 5 roles included in the framework are Planner, Owner, Designer, Builder, and Subcontractor. The EA provided several good things to the company. The EA system streamlined American Express’s processes, even as they were constantly re-analyzing how their business was being performed with the added intricacies of new delivery channels (Pearlson and Sanders, 2013). The employment of their enterprise architecture was key to adapting to this new business environment the company now found itself in. The enterprise architects worked closely with other departments and were able to both standardize applications throughout the organization and help create the strategies for each division. The Zachman framework positively assisted in the implementation by answering the questions: What (data), How (function),  Where (network), Who (people), When (time) and Why (motivation). It helped point out the information needed for the EA and their relationships (Nogueira etc. al, 2011). The strategies they helped create involved initiatives for each business, along with their IT support, that aligned well with the overall business plan of the organization. These initiatives, referred to as â€Å"road maps,† standardized their tools, architectures, governance, capabilities, and many other processes (Pearlson and Sanders, 2013). Three types of roadmaps in particular were used by American Express: Technology, reference architecture, and utility/capability. The three roads maps all used a consistent lifecycle management standard and a standardized architecture governance process. Another helpful aspect of the system included the flexibility that EA provided, which worked well with their existing architecture service-oriented architecture (SOA). SOA is an architecture type where larger software programs are broken down into services connected to each other via orchestration (Pearlson and Sanders, 2013). The services work together to form a business process, creating an agile, reusable system for creating applications. The existing software components can be modified to quickly build applications in a rapidly changing environment like the one American Express was experiencing. The enterprise architects assisted in the company’s SOA with an emphasis on reusable utilities and components (Demirkan, 2006). This system is ideal for a rapidly changing environment such as the one American Express was experiencing. Though SOA is a widely-used technology that can increase the IS’s agility, flexibility and interoperability between applications, there are also drawbacks, including the economic and personnel resources (Choi, Nazareth and Jain, 2010). SOA can reduce IT costs and increase the company’s return on IT investment, however the short-term requirements to implement SOA could outweigh long-term benefits (Choi, Nazareth and Jain, 2010). There are also some drawbacks to implementing an Enterprise Architecture,  including the cost of implementation, the risk of stakeholders’ unwillingness to accept it, and the new EA not corresponding to the business goals. When implementing SOA or EA, the entire IS organization is affected, along with the business alignment (Choi, Nazareth and Jain, 2010). Using a Zachman framework to implement the EA defined the involvement of stakeholders, as well aligning the EA goals with the business goals, which alleviated much of the risk of implementing the EA. The Zachman framework helped to avoid the risk that the architecture was not a fit for the employees and customers. In conclusion, the implementation of an EA is a complex endeavor, but was a necessary one for American Express to have the necessary tools to organize and document the whole enterprise, allowing them to quickly and efficiently change with the ever-changing business environment and customer needs. The Zachman Framework assisted in the implementation of the EA, and the company’s SOA gave it the desired agility needed to meet the customers’ needs. Recommendations My recommendation is that American Express’s continue to use the agility of their SOA to keep up with the changing environment. Their current EA was a great architecture that fit in perfectly with their business strategy. Moving forward, American Express will continue to use their highly efficient EA to meet the industry demands that they and their customers will face. The EA has worked well for them thus far, and should carry on as the ideal architecture of the firm in the near future. American Express will continue to face challenges beyond the near-term future and need re-analyze the situation prior to considering another overhaul of their current infrastructure. Many companies fail when attempting to implement an enterprise architecture. An EA will often fail if it is regarded as a separate initiative (Lohe, 2014), but American Express used it as a driver of their business and embedded it into their corporate strategy. Per the drawbacks noted above, this is a large and potentially costly undertaking. The agility of their current SOA and EA should allow the  company to adapt future challenges and they should not rush into an architecture overhaul. Furthermore, I would recommend using this system to its fullest potential by embracing the changing environment as much as possible. They can gain an edge on their competitors by focusing on mobile payments, new payment methods, and the newest innovations and technologies their clients are exposed to. The technological environment is constantly changing with new payment methods like Google Wallet and Apple Pay. Due to their EA, American Express is in prime position to accept these new methods as they develop. References Choi, J., Nazareth, D. L., & Jain, H. K. (2010). Implementing Service-Oriented Architecture in Organizations. Journal Of Management Information Systems, 26(4), 253-286. Corporate Profile. (2015, January 1). Retrieved February 22, 2015, from http://ir.americanexpress.com/CorporateProfile.aspx?iid=102700 Demirkan, H., & Goul, M. (2006). AMCIS 2006 PANEL SUMMARY: TOWARDS THE SERVICE ORIENTED ENTERPRISE VISION: BRIDGING INDUSTRY AND ACADEMICS.Communications Of The Association For Information Systems, 18546-556. Knor, E. (2011, September 19). The 2011 Enterprise Architecture Awards. Retrieved February 22, 2015, from http://www.infoworld.com/article/2619868/enterprise-architecture/enterprise-architecture-the-2011-enterprise-architecture-awards.html Là ¶he, J., & Legner, C. (2014). Overcoming implementation challenges in enterprise architecture management: a design theory for architecture-driven IT Management (ADRIMA). Information Systems & E-Business Management, 12(1), 101-137. doi:10.1007/s10257-012-0211-y Nogueira, J. M., Romero, D., Espadas, J., & Molina, A. (2013). Leveraging the Zachman framework implementation using action – research methodology – a case study: aligning the enterprise architecture and the business goals. Enterprise Information Systems, 7(1), 100-132. doi:10.1080/17517575.2012.678387 Pearlson, K. (2001). Organizational Strategy and Information Systems. In Managing and using information systems: A strategic approach. New York: J. Wiley & Sons. Pereira, C. M., & Sousa, P. (2004). A method to define an enterprise architecture using the zachman frameworkdoi:http://dx.doi.org/10.1145/967900.968175

Mental Health Care And Suicide Awareness - 1264 Words

This paper is meant to explore the occurrence of suicide in the context of its causes and the effects it has on adolescents. Generally, the literature reviewed revealed a strong connection between economics and mental illness as the two relate to causes of suicidal ideation. More simply, there is evidence that as a person’s economic standing reduces, he or she is more prone to mental illness which can expose them to suicidal risk and behavior. Additionally, suicides especially those which occur in areas with economic issues but in nations with an overall high degree of industrialization and urbanization, are likely to trigger an increased occurrence of suicide. The question to be examined is: There is a negative relationship between†¦show more content†¦In all, 42,773 people died from suicide in 2014, compared with 29,199 in 1999.† Suicide does not take place in a sociocultural vacuum, with several distinct types of factors coming into play which can influence a person’s decision to take their own life. For example, economic stress has a significant impact on a person’s mental health, as financial obligations such as childcare, housing, and other expenses tend to pile up during difficult financial situations. Both men and women experience higher rates of stress and mental illness during times of economic hardship, though that may or may not trigger someone to commit suicide on their own. Historically, suicide and the patterns of its consequences have not been studied extensively. Before 1897, there has been little scholarship done on suicide. This changed when French Sociologist Emile Durkheim published his paper on the topic. His work was the first to emphasize the importance of social and psychological factors in a person’s possible decision to end his or her own life. Before this time, suicide was very much a taboo subject, surrounded by myth and folk tales and nearly devoid of scholarly or reliable information. Deadly self-harm is equal to the harm of others among the worst possible outcomes of mental illness. So, to truly understand the nature of suicide one must understand the factors which contribute to itsShow MoreRelatedSuicide Is A Serious Issue1679 Words   |  7 PagesSuicide is one of the largest social problems today affecting many lives in one way or another. It is a serious issue with multiple contributors that have been elusive in many cases as we try to understand why many younger people are choosing to end their lives instead of receive the help they need. Suicide is a serious issue that can have lasting results on individuals, families and communities. 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