Healthy People 2020 Research Paper Example | Topics and Well Written Essays - 1250 words - 1

Healthy People 2020 - Research Paper Example Finally, in 2010, Healthy People 2020 was launched to guide health work for the next 10 years or up to 2020. Sometime during the mid-period or thereabouts of each of the ten-year programs, a mid-course review is conducted. For instance, the mid-course review for Healthy People 2010 was started to be published in December 2006. Presumably, therefore, a mid-course review for Healthy People 2020 will be done sometime 2015 or thereabouts. The launching of Healthy People 2020 was announced by the U.S. Department of Health and Human Services through an official press release on 2 December 2010. According to the U.S. Department of Health and Human Services (2011), there are four overarching goals in Healthy People 2020. First, the attainment of â€Å"high-quality, longer lives free of preventable disease, disability, injury and premature death.† The second overarching goal is the achievement of health equity, elimination of health disparities, and improvement of health of all groups. The third overarching goal is the creation of social and physical environments that promote good health. Finally, the fourth overarching goal is the promotion of a quality of life, health development, and healthy behaviors across all life stages. The four overarching goals are declared in the official website of the U.S. Department of Health and Human Services for its healthy people programs in www.healthypeople.gov as well as in a brochure produced in November 2010. According to the U.S. Department of Housing and Urban Development (2010, p. 4), the population of Montgomery was estimated at 366,900 as of 1 July 2010. Approximately, 60 percent of the population resides in Montgomery County. Further, according to the U.S. Department of Housing and Urban Development (2010, pp. 4-5), Montgomery’s population was growing at an average of 1.3 percent annually during the 1990s but the population growth rate dropped to 0.1 percent annually since 1 July 2008. Unemployment rate in

Why to get out of the Navy after 10 years of service Essay

Why to get out of the Navy after 10 years of service - Essay Example ed performance of duty until a service member is approved for length of service retirement creates a rebuttable presumption that a service member’s medical conditions have not caused premature career termination. In that situation, the PEB finds these members to be PFit. A finding of PFit means that the evidence presented to achieving retirement eligibility. Members found to be PFit have the same rights within the DES as those found Fit. While members found PFit are not eligible for disability retirement, they are still eligible for retirement under other provisions of law, as well as for evaluation by the Department of Veteran’s Affairs for disability compensation. In this paper we would be discussing on the ground taken by U.S on the separation of naval officers in the past and the reasons for the same. A service member is unfit to continue naval service when one or more physical and/or mental disabilities prevent him or her from reasonably performing the duties of his or her office, grade, rank, or rating. The PEB makes the decision on Fitness by balancing the extent of a member’s disability, as shown through objective medical and performance evidence, against the requirements and duties that the member may reasonably be expected to perform in his or her office, grade, rank, or rating. Typical medical evidence used by the PEB includes a narrative summary written by the Medical Evaluation Board (MEB), history and treatment of the injury or illness, referrals to doctors and sick call, and type and frequency of medication. Performance evidence includes non-medical assessments from the member’s command, personnel records, promotions, awards, and adverse personnel actions. In the period between the Spanish-American War and the U.S. entry into the war in Europe in 1917, new sources of Army officers were experimented with and expanded, federal authority over the militia was extended, and an Army reserve officer corps was established. The Navy formally

Gang Violence and Juvenile Delinquency Research Paper

Gang Violence and Juvenile Delinquency - Research Paper Example According to the Finley (2007), cultural and social landscape has varied significantly since the establishment of the juvenile system in the early 1990s. In essence, gangs, drugs and easy accessibility to deadly weapons have contributed majorly to the increasing number of juvenile crimes including murder which currently has reached an alarming rate. They further claim that juvenile court system has insufficient resources to handle amicably the problems brought by amoral teenagers and children in the society. Rosenheim (2002) explains that the perceived clemency associated with the juvenile justice system as prescribed by the juvenile laws insinuate that it is not within the context of law for the juvenile court judge to warrant any form of punishment for the young criminal but to issue rehabilitation assistance to the juvenile. This has highly contributed to the juvenile system lack of capacity of correcting the amoral behavior fostered by the young but violent children. The system b ased on the current situation juvenile law stimulates a rotating-door course that leads the message that juvenile criminals are not held responsible for their wrong doings and not until these offenders are subjected to adults criminal courts that when they experience punishment for the first time in their lives. Based on my analysis, the law should be revised to allow for the punishing of the juveniles criminals in the first instance as this would prevent future amoral activities when the juvenile offender shall have grown into adult. In addition, accordance with the juvenile law, it is prohibited to release the juvenile criminal perpetrators from the authority of the juvenile court at an age above eighteen years. Serving less years in juvenile jail for an offense which would have earned an adult ten or more years sentence is unjust. For effective operation and success of this system, punishment for the misconduct should be the same irrespective of the age of the offender (Whitehead and Steven, 2006). Owing to these inadequacies and problems associated with juvenile laws, many critics have proposed for its complete overhaul or amendment of some of its laws, failure of which the crime rate among the young perpetrators would continue to escalate in the society. According to Scott and Steinberg (2008) some of these mitigation measures are juveniles should have complete DUEPROCESS rights such as right to trial by jury in the same way adult criminals are tried, freedom from the rehabilitation ideology associated with the juvenile system, allowing the juvenile to be tried to court once the young perpetrators are convicted and letting the juveniles to be accountable for their amoral actions. Theories of Delinquency Causation According to Banduras social theory, people acquire knowledge via observing others’ attitudes, behavior and results of those behaviors. Based on this theory, majority of human conduct is learned through observation and modeling. This infer s that through observing how others conduct themselves, one comes up with the idea of how newly acquired behaviors are carried out and eventually this explicit information works as a blueprint

The Gospel Of St. Paul Essay Example for Free

The Gospel Of St. Paul Essay The Apostle of the Gentiles as Saint Paul is revered as, is a persecutor of the followers of Christ, of Christians. It was on his way to Damascus that Jesus Christ revealed Himself to Saul (the Jewish name of Paul). It is in Chapter 22 of the Book of Acts that the incident was narrated when Jesus Christ asked Paul as to why Paul is persecuting the Lord. Hence, the Lord Jesus commanded Paul to go to Ananias where Paul got the message that the Lord has chosen him to spread his Word and declare His name to all pagans and Kings and nations. This revelation that brought about the conversion of Paul is due to the spirit of the Lord Jesus Christ to have dwelt in Paul. Paul awakened to the distinction of the life he wishes and is destined to pursue as a Christian compared to his life as a Jew. Being born with the spirit of Jesus Christ at that instance and thenon caused the Word of God to dwell in him It was immediately clear to Paul who is Jesus Christ and how he will communicate to the whole world about him. It is a paramount teaching and admonition of Saint Paul that mankind should listen to the spirit, as he wrote his First Letters to the Thessalonians (Chapter 5 Verse 13). Paul thus was fully empowered and authorized to spread the Word of God and the Knowledge of God. â€Å"Paul sees himself as a charismatic. Consequently his proclamation rests on the power of the spirit and is accompanied by signs and wonders. He was given the grace of the apostolic office. Through this he has special authority that he can exercise with regard to the church, even if he makes only reluctant use of it. † After the conversion and baptism of Paul in Damascus he went to Arabia to prepare for his mission. He returned to Damascus and started preaching which enraged the Jews. Feeling the threat of such anger, Paul visited Peter and the other apostles in Jerusalem. It was Barnabas who introduced Paul to Peter and the other apostles, declaring that Jesus Christ revealed himself to Paul and spoken to him and that Paul had already preached in the named of Jesus Christ. So when Peter and Paul met together with James, Paul learned from them everything about the resurrection of Jesus Christ. Peter narrated how the event happened and proven as Jesus Christ revealed himself as alive and risen from the dead to hundreds of people So, together with the 12 apostles and the witnesses to Christ’s resurrection, Paul considers his enlightenment as a way of tradition which he relays to those he converts to follow Jesus Christ. â€Å"Tradition was a living and growing thing in the first-century church: the tradition which Paul delivered was fuller than what he received, for he was able to amplify the record of appearances of the risen Lord with his personal testimony. † Peter and the rest of the apostles were wary about Paul as he was known to be a persecutor of Christians. Yet, they all felt and believed that they are indeed being made to be united for the mission that is to declare the Word of God. Paul and the apostles met with the Council of Jerusalem where they encountered the profound issue of the Mosaic Law – the commandments of God has handed down to Moses. One of the mandates that the Jews standby firm is that salvation will only be attained after circumcision in the manner of Moses. The law must be strictly adhered to and the people of Jerusalem believes no other means to heaven. â€Å"The law had a special relationship with Israel, particularly to protect and discipline Israel in the period from Moses to Christ. But that was a temporary role. It should not be assumed, however, that this is the only function of the law and therefore that the coming of Christ means the abolition of the law† Yet, Paul heard how Peter has explained that belief and living by the Word of God in the way Jesus Christ has taught and exemplified and lived and died for is the true message of salvation. It is in such faith, Peter and the apostles thus attested that God’s miracles and wonders that they have seen and done were made possible. It is to adhere to the Word of God and at the same time avoiding all sins of idolatry and lusts. Paul was further enlightened on what Jesus Christ gospels and teachings are geared to. That God is a forgiving and all knowing God. His Divine Plan for mankind is to live in peace and love amongst each other and to revere His Divinity as one and absolute. And as Paul went about his ministry to propagate the faith in such accord, he was known for the solidity of his thoughts, the fluidity of his message and the sanctity of his feelings for mankind. â€Å"Paul’s theology of God was no abstract speculation but sustained and informed by his own experience in conversion and mission and prayer. It is the integration of intellectual rigour, missionary and pastoral effectiveness, and personal experience which makes his speech about God so compelling. † Paul’s teaching about the goodness of God as exemplified in giving to the world His Only Son by dying on the cross. Yet he expounded on the lesson that death from this life is a transition to another, better life. Paul achieved the realization as he painstakingly preached that Jesus Christ proved that it is in dying that man is born to eternal life. â€Å"The power of Christianity inspired by this faith in the resurrection of Jesus Christ, it is hard for us now to realize. Eighteen centuries have intervened between our selves and the living witnesses of the resurrection. But then they were living. And yet there were difficulties which Paul had to encounter, and many of them. It was not plain or easy work. † Thus, the preaching method of Paul ventured on showing and demonstrating the goodness he experienced in his vision of Jesus Christ. His change and his commitment to the Lord were all gifted to him. Jesus Christ became the only basis of his interpretation of the goodness of God; what a true relationship to God is all about. It is because as Paul explained in his Letter to the Galatians in Chapter 1, Verses 12 to 16, his enlightenment and conversion and mission do not come from man but from Jesus Christ. â€Å"The connotation of communicated knowledge is reinforced by the fact that, strictly speaking, what is revealed in v. 12 is the ‘good news’ whereas the purpose of the revelation in v. 16 is ‘to preach good news’. In Paul’s case, conversion and call to ministry are inseparable† Bibliography: Abbott, Lyman. The Life and Letters of Paul the Apostle Boston and New York Houghton, Mifflin and Company The Riverside Press, Cambridge, 1898 Becker, Jurgen; Dean, O. C. ; Soards, Marion L. Paul: Apostle of the Gentiles Westminster John Knox Press, 1993 Bruce, Frederick Fyvie. Paul, Apostle of the Heart Set Free Wm. B. Eerdmans Publishing, 2000 Dunn, James D. G. The Theology of Paul the Apostle Wm. B. Eerdmans Publishing, 2006 O’Connor, Jerome Murphy- Paul: A Critical Life Oxford University, 1997 The Holy Bible. King James Version New York: American Bible Society, 1999 New York: Bartleby. com, 2000

The Water In Nature Environmental Sciences Essay

The Water In Nature Environmental Sciences Essay What better way to spend a hot summer day lolling on a li-lo in the pool, with a drink in hand, staring at the clouds. This would be impossible without water. Although over 97 percent of water on Earth is part of the world ocean and a further 2 percent is ice, neither of these is easily transformed into usable water. Less than 1 percent of the total amount of water on Earth is usable for drinking, agriculture or industry (Bartholomew 2005). We take water for granted, yet this most precious resource is under threat. The view that life on earth has with water is inescapable without water, life can simply not exist. This essay will provide information about water and explain why it is the Earths most important resource. First, water in natural world will be explored in the project. Then, the use of water in human civilization is delivered. The last part of the research paper is analysis of water scarcity situation making it the most crucial resource. 2. Discussion of findings . Water in nature Water in natural world is divided into two main types: fresh water and salt water. Salt water is in the oceans. There are four oceans: the Atlantic, Pacific, Indian, and Arctic. Fresh water is almost contributed to lakes, streams, and rivers. The majority of freshwater is frozen, mainly in the form of glaciers and icecaps. Other frozen water sources include permanently frozen ground, icebergs, and ground ice. There are two types: running water and ground water. The former is mainly available in rivers, streams and rainfall. The second freshwater source is groundwater. This is water that lies under the surface. It exists almost everywhere in the world. The level of groundwater is supplied, in part, by precipitation. When rain falls, for example, it sinks down into the ground and is collected in aquifers (American Geosciences Institutes On-Line n.d). The total amount of water near the surface of the Earth stays almost the same through time, but water is always moving from place to place. This process takes place in various ways. It can transfer in the form of liquid, solid, or vapor. This complicated movement of the Earths water is called the hydrologic cycle (American Geosciences Institutes On-Line n.d.). It is an enormous system generated by energy from the sun where the atmosphere provides the vital connection between the oceans and land. Water from the oceans and the continents is persistently evaporating into the atmosphere. Winds carry the moisture-laden air until the complex process of cloud formation is set. This process is called condensation. The condensation results in precipitation that falls into the ocean and land surface. This has ended water cycle and prepared to start another (Edward Frederick 1990). What happens to precipitation once it has fallen on land? A part of the water soaks into the ground, some of it moving downhill, laterally running into lakes, streams or directly into the ocean. When the rate of rainfall is greater than the Earths ability to absorb it, the additional water flows over the surface into lakes and streams. Also, some of the water that soaks in the ground surface is absorb by plants, which then release into the atmosphere. When precipitation falls at high raises, the water may not immediately soak in, run off, or evaporate. Instead it may turn into part of a snowfield or glacier. Glaciers store large amount of water on land. If present-day glaciers were to melt and release their storage of water, sea level would rise by several tens of meters and plunge many heavily populated coastal areas (Edward Frederick 1990). 2.2. Water in human civilization Water has shaped our civilizations since the beginning of human existence. Our earliest ancestors used to hunt, gather and wander around to find food and water to survive. Evolution led to early civilizations understanding agriculture which allowed them to stay in one place and create civilizations. They would form small towns around water for agricultural reasons (waterservicesolution.wordpress.com 2012). In todays world, water is still one of natures most important gifts to mankind. It is essential for life and survival, and also for cultural and artistic expression. Water is vital for humans needs, for homes and gardens, for agriculture, industry, and the environment. It can provide a means of transportation and is also a focus for leisure, social and sporting activities (Department for Education and Child Development n.d.). Humans survival depends on drinking water as it accounts for 75 percent of body weight. Water is one of the most crucial components to good health. It is necessary for humans body to digest and absorb food; helps maintain proper muscle tone; supplies oxygen and nutrients to the cells; gets rid of the body of wastes; and serves as a natural air conditioning system (Sandi and Darrin 2012). Agriculture accounts for about 70% of water all over the world, increasing to over 90% in developing areas. It is necessary for the production of our food, the natural fibres of our clothing and other goods based on agricultural fresh materials. Industry depends on water, much like agriculture and domestic households depend on water. Industrial reliance on water makes it essential to preserve water in every aspect possible and make sure water pollution is kept at minimum levels (Schroeder 2004). Industrial water withdrawals comprise approximately 23% of water consumption. In a range of industries, water is a key part of manufacturing process. Water is used to cool and heat systems and as an important product component. It is consumed, reused, processed, transformed and discharged (World Economic Forum 2008). According to the United Nations World Water Development Report (n.d.), some 300-500 million tons of heavy metals, solvents, toxic sludge, and other wastes store each year from in dustry, most of which gets into the freshwater supply. In some developing countries, 70% of industrial wastes are dumped into untreated waters where they pollute the drinking water. 2.3. Situation of water scarcity Over the last 300 years, world population has increased sevenfold, but water use has rocketed by 35 times. Since 1950, the amount of renewable fresh water each year available per human being has dropped by more than half (Organization for Economic Co-operation and Development (OECD) 2010). Now, over 1.2 billion people 20% of the worlds population live in areas where the limits of sustainable water use have been reached. A report made by the CGIAR, FAO, CBD and the Ramsar Convention in 2007 predicted that we will not have enough water to meet global demand for food over the next few decades unless reorganizations in water and agriculture are carried out. Here illustrate some examples of effects of water scarcity. Global wheat supply has been restricted due to unsuccessful wheat crops as a result of severe drought in Australia. In the United States, it was predicted by the Environmental Protection Agency in October 2007 that the City of Atlantas main source of water, Lake Lainer, would be exhausted within 100 days unless considerable managements were taken. Climate change makes the situation worse. In Los Angeles, only 3.21 inches of rainfall were noted in the whole 2006-2007 rain season. It was the driest period on record (World Economic Forum 2008). The impacts of water scarcity influence a large number of sponsors in a variety of ways: commercial federations, communities health, the well-being of citizens, the success of local industries in the supply chain, the ability of local agriculture to deliver the crops demanded by people and the economy, and the potential of the natural environment to function effectively (World Economic Forum 2008). In nowadays world, approximately two-fifths of the total population live in water shortage situation. Therefore, new policies of water management are urgently needed when the worlds population is predicted to have increased to 2-3 trillion people by 2050. Vietnam is also involved in the risk of water sources being exhausted. As urbanization and industrialization are taking place, peoples demand on consuming water for economic purposes and daily activities is now rising rapidly. As a result, water pollution and scarcity becomes a common and extremely serious phenomenon (Lao Cai Department of Water Resources and environment website n.d.) 3. Conclusion The essays analysis has demonstrated that water has been becoming Earths most essential resource. Water plays an important role in harmonizing the natural circulation as well as meeting the demand of humankind. Yet this most precious resource is now scarce and on the edge of running out if no plan and policy is carried out. Obviously, more than one solution is necessary in order to reduce or solve the problem of water scarcity that the world copes with today. Our world recently faces a problem concerning a limited water supply. If the issue continues to grow without substantial changes, negative consequences are inevitable. Nevertheless, there are reasons to believe in a sufficient and qualified water supply in the future as authorities and organization are making considerable efforts to solve the serious situation. Word count: 1500

Teen Sexual Activity Causes Sexually Transmitted Diseases, AIDS, Pregnancy, and Emotional Trauma :: Expository Cause Effect Essays

Teen Sexual Activity Causes Sexually Transmitted Diseases, AIDS, Pregnancy, and Emotional Trauma Set aside the moral imperatives, the screams and shouts of the conservative masses, the legislators on Capitol Hill who know what's best, and religious scripture that denounces physical pleasure and there exists a very basic premise: Human beings have a preoccupation with sex. It was once stated that "our concern with sex is innate, as much a part of is as the blood and bone with which we were born." An absolutely truthful statement, the subject of sex has become prevalent in today's society. Prevalent, because every aspect, voice, form of communication, law passed, and free thought, expresses the opinion on the subject. Maybe centuries of society's need for "sexual oppression" which led to the "sexual revolution" of the twentieth century, is the cause for the entrance of human sexuality into the mainstream. Regardless of the when's, why's, and how's, the bottom line is that sex and the issues revolving, affect every human life, from pornography and abortion, teen pregnancy and laws concerning sexual violence. These heavily weighted issues that plague the minds of parents, lawmakers, teenagers, and religious leaders, often operate under the premise that everyone is having sex, and that no one believes in abstaining until marriage. So where is the lost voice that cries out and defends the small minority of young people that want to wait, and further doesn't anyone believe there are benefits to waiting to have sex? Those who condemn teenage sex and support abstinence are the same people who answer "yes" to the question. Unfortunately, that voice is not the voice that represents the teenage population. Young people who chose to wait have many different reasons why, and believe that there do exist positive effects of abstaining from sex until marriage. One of the most important reasons young people wait, is to avoid the risk of poor or unfavorable physical health. Sexually transmitted diseases, pregnancy, and AIDS are all factors that claim the lives of millions of people every year. Avoidance of these health risks is an incentive to young people and probably the most positive effect of abstaining. No one doubts that sexual desire and needs do not exist, but there are alternatives to sexual intercourse. Teenagers can have a very healthy and active physical relationship with their partner and not have sex. These activities, which can be just as satisfying, carry a 100% less risk factor that sexual intercourse. Teen Sexual Activity Causes Sexually Transmitted Diseases, AIDS, Pregnancy, and Emotional Trauma :: Expository Cause Effect Essays Teen Sexual Activity Causes Sexually Transmitted Diseases, AIDS, Pregnancy, and Emotional Trauma Set aside the moral imperatives, the screams and shouts of the conservative masses, the legislators on Capitol Hill who know what's best, and religious scripture that denounces physical pleasure and there exists a very basic premise: Human beings have a preoccupation with sex. It was once stated that "our concern with sex is innate, as much a part of is as the blood and bone with which we were born." An absolutely truthful statement, the subject of sex has become prevalent in today's society. Prevalent, because every aspect, voice, form of communication, law passed, and free thought, expresses the opinion on the subject. Maybe centuries of society's need for "sexual oppression" which led to the "sexual revolution" of the twentieth century, is the cause for the entrance of human sexuality into the mainstream. Regardless of the when's, why's, and how's, the bottom line is that sex and the issues revolving, affect every human life, from pornography and abortion, teen pregnancy and laws concerning sexual violence. These heavily weighted issues that plague the minds of parents, lawmakers, teenagers, and religious leaders, often operate under the premise that everyone is having sex, and that no one believes in abstaining until marriage. So where is the lost voice that cries out and defends the small minority of young people that want to wait, and further doesn't anyone believe there are benefits to waiting to have sex? Those who condemn teenage sex and support abstinence are the same people who answer "yes" to the question. Unfortunately, that voice is not the voice that represents the teenage population. Young people who chose to wait have many different reasons why, and believe that there do exist positive effects of abstaining from sex until marriage. One of the most important reasons young people wait, is to avoid the risk of poor or unfavorable physical health. Sexually transmitted diseases, pregnancy, and AIDS are all factors that claim the lives of millions of people every year. Avoidance of these health risks is an incentive to young people and probably the most positive effect of abstaining. No one doubts that sexual desire and needs do not exist, but there are alternatives to sexual intercourse. Teenagers can have a very healthy and active physical relationship with their partner and not have sex. These activities, which can be just as satisfying, carry a 100% less risk factor that sexual intercourse.

Data Collection Essay

* The Rough was excluded during the calculation of the mean as the rough was a trial to indicate the general whereabouts of the end point, which is inaccurate of the exact end point. Table 2. Observations collected during the experiment. Table contains observations which were recorded during each trial of the experiment. Trials Observations Before trials * When water was added to the crystals of oxalic acid, it dissolved almost instantly with a light stirring of the beaker. Rough * When two drops phenolphthalein was added to the solution of sodium hydroxide, the solution turned pink. * After adding about 20.8dm3 of oxalic acid into the sodium hydroxide solution, while swirling the conical flask, the solution turned completely clear – the oxalic acid was filled up to 21dm3 to have a rounded rough end point to work with. 1 * When two drops of phenolphthalein was added to the sodium hydroxide solution, the solution turned pink. * After adding about 20dm3 of oxalic acid solution, while swirling the conical flask gently, each drop of oxalic acid solution began to turn the pink solution slightly clear. * After about 20.6dm3 oxalic acid solution was added, the pink solution turned completely clear. 2 * Two drops of phenolphthalein was added to sodium hydroxide solution, producing a pink coloured solution. * After about 20dm3 of oxalic acid solution was added, each drop began turning the pink solution slightly clear. * After adding around 20.4dm3 of oxalic acid solution, the pink solution turned completely clear. 3 * Two drops of phenolphthalein was added to the sodium hydroxide solution, turning the solution in the conical flask pink. * After adding about 20dm3 of oxalic acid solution, each drop began turning the pink solution slightly clear. * When about 20.3dm3 of the acid was added, the pink solution turned completely clear. Data Processing 1. Write an equation for the reaction. (COOH)2 + 2NaOH –> 2NaCO3 + 2H2O 2. What amount (in moles) of NaOH is present in 20.0 cm3 of 0.097 mol dm-3 sodium hydroxide solution? c = n/v c = 0.097mol dm-3 à ¯Ã‚ ¿Ã‚ ½0.001 = 0.097mols à ¯Ã‚ ¿Ã‚ ½ (0.001/0.097 x 100%) = 0.097mols dm-3 à ¯Ã‚ ¿Ã‚ ½1.03% v = 20.0cm3 à ¯Ã‚ ¿Ã‚ ½0.04 = (20.0/1000) à ¯Ã‚ ¿Ã‚ ½ (0.04/20.0 x 100%) = 0.020dm3 à ¯Ã‚ ¿Ã‚ ½0.2% n = ? n = c x v n = 0.097 à ¯Ã‚ ¿Ã‚ ½1.03% x 0.020 à ¯Ã‚ ¿Ã‚ ½0.2% n = 0.00194 à ¯Ã‚ ¿Ã‚ ½ (1.03 + 0.2)% ? n = 0.00194 mols à ¯Ã‚ ¿Ã‚ ½1.23% 3. What amount of oxalic acid was present in the average volume required to react exactly with the sodium hydroxide solution? Using the molar ratio of 1:2 for acid : base respectively: 0.00194 à ¯Ã‚ ¿Ã‚ ½1.23% / 2 = 0.00097 mols ? amount of oxalic acid present = 0.00097 mols à ¯Ã‚ ¿Ã‚ ½1.23% 4. What amount of oxalic acid was present in your 250 cm3 volumetric flask? Concentration of acid in 250mL is the same as the concentration of acid in 1L. Therefore the concentration of acid in 1 dm-3 of acid solution is the same as concentration of acid in 250mL: c = n/v c = 0.0119à ¯Ã‚ ¿Ã‚ ½2.03% / 0.25 à ¯Ã‚ ¿Ã‚ ½(0.15/250 x 100%) c = 0.0476 à ¯Ã‚ ¿Ã‚ ½ (2.03+0.06)% ? c = 0.05 mols dm-3 à ¯Ã‚ ¿Ã‚ ½2.09% (concentration of acid) c = n/v 0.05à ¯Ã‚ ¿Ã‚ ½2.09% = n / 0.25 à ¯Ã‚ ¿Ã‚ ½0.06% 0.05à ¯Ã‚ ¿Ã‚ ½2.09% x 0.25à ¯Ã‚ ¿Ã‚ ½0.06% = n ? n = 0.0125 à ¯Ã‚ ¿Ã‚ ½ (2.09 + 0.06)% ? moles of oxalic acid in 250mL solution = 0.0125 mols à ¯Ã‚ ¿Ã‚ ½2.15% 5. What is the mass of one mole of oxalic acid? n = m/MM MM = m/n MM = 1.5g à ¯Ã‚ ¿Ã‚ ½0.02 / 0.0125mols à ¯Ã‚ ¿Ã‚ ½2.15% MM = 1.5 à ¯Ã‚ ¿Ã‚ ½(0.02/1.5 x100%) / 0.0125à ¯Ã‚ ¿Ã‚ ½2.15% MM = 120 à ¯Ã‚ ¿Ã‚ ½(1.33+2.15)% MM = 120 à ¯Ã‚ ¿Ã‚ ½3.48% m = n x MM m = 1 x 120à ¯Ã‚ ¿Ã‚ ½3.48% ? mass of one mole of oxalic acid = 120g à ¯Ã‚ ¿Ã‚ ½3.48% 6. How many molecules of water of crystallisation are present in one mole? MM of (COOH)2 = 2(12.01 + 32 + 1) = 90.04 MM of H2O = (2.02 + 16) = 18.02 (COOH)2.xH2O = 120g à ¯Ã‚ ¿Ã‚ ½3.48% ? 90.04 + 18.02x = 120g à ¯Ã‚ ¿Ã‚ ½3.48% ? 18.02x = 120g à ¯Ã‚ ¿Ã‚ ½3.48% – 90.04 ? 18.02x = 29.96à ¯Ã‚ ¿Ã‚ ½3.48% (/18.02) ? x = 1.6626à ¯Ã‚ ¿Ã‚ ½3.48% ? Molecules of water of crystallisation = 1.66à ¯Ã‚ ¿Ã‚ ½0.06 Conclusion and Evaluation Discussion 1. Estimate the degree of uncertainty in your readings using the balance, the volumetric flask, the pipette and the burette. How accurately can you quote your answer? Balance = à ¯Ã‚ ¿Ã‚ ½0.02g Volumetric flask = à ¯Ã‚ ¿Ã‚ ½0.15mL Pipette = à ¯Ã‚ ¿Ã‚ ½0.04cm3 Burette = à ¯Ã‚ ¿Ã‚ ½0.15cm3 The equipments used were relatively accurate as the uncertainties compared to the collected values are small. 2. Compare your answer with the correct answer and work out the percentage error. Percentage error = [(experimental value – actual value) / actual value] x 100% = [(1.6626 à ¯Ã‚ ¿Ã‚ ½3.48% – 2) / 2] x 100% = 16.87% à ¯Ã‚ ¿Ã‚ ½1.74% 3. Suggest any other reasons for possible error. Other reasons for possible error include the uncertainty of equipments, human errors and mistakes, possibility of contaminated solutions, air bubbles and transference of solution between equipments. This experiment was conducted to find the ratio of water in hydrate oxalic acid crystals. This included calculations of the theoretical and experimental values for the ratio of water in the hydrate oxalic acid crystals and the percentage errors of values compared. The equation for the reaction between the sodium hydroxide solution (NaOH) and the oxalic acid solution ((COOH)2) was worked out, with the product being a salt (NaCO3) and water (H2O). As the oxalic acid solution is a dibasic acid solution, the reaction ratio with sodium hydroxide is 1:2. The amount of NaOH, in moles, was also calculated by multiplying the concentration of the sodium hydroxide solution and the volume of sodium hydroxide solution used. The equation c = n/v was used to calculate this. The result was 0.00194 moles of NaOH in the sodium hydroxide solution with an uncertainty of à ¯Ã‚ ¿Ã‚ ½1.23%. The amount of oxalic acid presented in the average volume required to react exactly with the sodium hydroxide solution was also calculated; by dividing the moles of NaOH (0.00194à ¯Ã‚ ¿Ã‚ ½1.23%) by 2, based on the 1:2 reaction ratio stated before. The result was 0.00097 moles with an uncertainty of à ¯Ã‚ ¿Ã‚ ½1.23%. The amount of oxalic acid present in 250cm3 was also calculated. The concentration of acid in 250mL is the same as the concentration of acid in 1L, therefore, the concentration of acid in 1dm-3 of the oxalic acid solution is the same concentration as the acid in 250mL. With this understood, the equation c = n/v was used once again. The ‘concentration’ was first calculated by dividing the moles of NaOH by 0.25dm3. The result (0.05mols dm-3 à ¯Ã‚ ¿Ã‚ ½2.09), was used in further calculations to determine the moles of oxalic acid by multiplying the previous calculated concentration (0.05mols dm-3 à ¯Ã‚ ¿Ã‚ ½2.09) with 0.25dm3, resulting in the moles of oxalic acid in the 250mL solution as 0.0125mols à ¯Ã‚ ¿Ã‚ ½2.15%. This value was used in the calculation of the mass of one mole of oxalic acid. The equation n = m/MM was used in this calculation. The MM (molar mass) was first calculated, dividing the mass of oxalic acid crystals by the moles of oxalic acid (1.5 / 0.0125). The mass (m = n x MM) was calculated with the result of this (1 x 120à ¯Ã‚ ¿Ã‚ ½3.48%), resulting in the mass of one mole of oxalic acid being 120à ¯Ã‚ ¿Ã‚ ½3.48%. Finally, the molecules of water of crystallisation presented in one mole were calculated. This was done by using the mass of one mole of oxalic acid (120à ¯Ã‚ ¿Ã‚ ½3.48%), subtracting the MM of (COOH)2 (90.04) from it and dividing the result by MM of H2O (18.02). The final result of the number of molecules of water in crystallisation equalled 1.66 with an uncertainty of à ¯Ã‚ ¿Ã‚ ½3.48% or 0.06. With this final result, the percentage error was calculated, being 16.87%à ¯Ã‚ ¿Ã‚ ½1.74%. All the uncertainties within the values used were calculated into percentage through dividing the uncertainty by the value and multiplying it by 100%. The uncertainties were converted into percentages before doing calculations were done. There were several limitations found during this experiment which would have been the cause of an inaccurate final result – the variation between the theoretical value of 2 and the experimental value of 1.66à ¯Ã‚ ¿Ã‚ ½0.06. These limitations include the uncertainties of the equipment, human errors and mistakes, possibility of contaminated solutions, air bubbles found in solutions and the transference of solution between equipments. The significance of these errors and the improvements are listed in the table below. Limitations Significance Improvements Uncertainty of equipments Uncertainties were obtained during the experiment through the use of equipments. The inaccurate recording of data would have affected the results in the end. Eg. The readings on the electronic scale weren’t fully stable and consistent at one value, it varied – increasing and decreasing slightly. In the case of the electronic scale, it was suggested that the variation in weight value was due to the air-conditioning blowing down on it. The air-conditioner could be turned off to reduce the uncertainties and variations. Students could also prevent themselves from breathing heavily down onto the scale while measuring, this could have contributed to the variation as well. Human errors and mistakes Mistakes could affect the outcome and accuracy of results. Eg. While adding water into the volumetric flask to dissolve the oxalic acid crystals, a student accidentally added a little too much, over the 250cm3 that was intended. This would have over diluted the oxalic acid. This could have been avoided through patience while adding the water into the volumetric flask. This could also have been done slowly and carefully, probably using a pipette towards the end – at the 250cm3 mark. Reading the measurement of the pipette, burette and volumetric flask could have been inaccurate, causing results to be inaccurate and in turn affecting the calculations. Inaccuracy could have been due to improper way of reading the measurement. Students should have bent down slightly with the measurement at eye level. Student`s heads should not be tilted but level with the equipment as well. The measurement should also be read at the parallax, not above or below it. Possibility of contaminated solutions The experiment was conducted with the use of several different solutions. These solutions could have accidentally been mixed in with each other, causing the solution to be contaminated. The results obtained due to this could have been inaccurate, affecting the final results. Being careful with the solutions used would help avoid this. Using clean equipments for each different solution, making sure the solutions that are not meant to be placed together do not get mixed with each other. After the use of some of the equipments, they were to be washed and reused for another solution. The equipments were not dried before being used again; this could have diluted the solution and contaminated it. Drying the equipment each time after it is washed/cleaned would prevent access water and dilution of solutions. Air bubbles When transferring the dissolved oxalic acid into the burette, there were some tiny air bubbles. This would have because the measurement to be inaccurate as the air bubbles would have caused the reading of the solution to be greater than it actually is. Over time when the bubbles removed itself from the solution which would have caused a decrease in solution. The inaccurate measurement reading would have affected the final results of the experiment. The burette could have been left alone for awhile to allow the bubbles to float to the top. Whatever the amount the bubbles made up for, fill the burette up again with the use of a pipette. Transference of solution between equipments When transferring solutions between two or more differing equipments would have caused an increase of decrease in measurement. An inaccurate amount of solution would have affected the results or recorded data. When using a funnel during the transference of solution into the burette, it caused some increase in the desired amount. This is due to the tip of the funnel having some drops of solution left in it and when the funnel was removed, the movement could have caused those drops to drop into the burette, causing an increase in amount of solution. This could be prevented by either slowly removing the funnel or using the funnel up to a certain mark, remove it and fill up to the desired amount with the use of a small pipette – drop by drop. When using the 20mL pipette to transfer the sodium hydroxide into the conical flask, the tip of the nozzle had a drop that was tempted to drop out of the pipette. Avoid touching the sides and move the pipette over the flask slowly would reduce the chances of it dripping out and altering the volume of solution. A small amount of the solution was also stuck at the tip of the nozzle after being emptied. By touching the tip to the side of the flask would help that tiny bit of solution flow out. If possible have the nozzle flat on the side of the flask, this would allow it to flow out smoothly. To avoid or reduce these significant errors, these solutions and improvements should be taken into consideration during future repetition of this experiment. The experiment overall was invalid. Though the values in data collection may have been to a 0.10cm3 difference, the final calculation of the percentage error, 16.87%à ¯Ã‚ ¿Ã‚ ½1.74%, was much greater than the desired 1% causing the experiment to be invalid.