Theory of Bomb Calorimetry Essay Example for Free

Theory of Bomb Calorimetry Essay The purpose of this experiment is to learn how to apply the laws of thermodynamics to chemical reactions. In this particular experiment we will use a bomb calorimeter to study heats associated with combustion reactions. A bomb calorimeter is a device used for measuring the standard heat of combustion associated with a chemical reaction. The standard heat of combustion for a substance is defined as the enthalpy change, accompanies a process in which one mole of a substance undergoes a combustion reaction with oxygen. It can be found according to equation 1. 1) H- Enthalpy; R Gas Constant; n number of moles; U Internal Energy; s denotes sample combusted; 0 denotes standard state (25C, 1bar). The internal energy change of the sample is found from from equation 2, where change in temperature is obtained from experiment and heat capacity of the calorimeter is obtained from standardization of the bomb calorimeter (see Preparations section). The heat capacity of the wire is usually known. 2) T- temperature; w denotes iron wire. Gas constant, R, can be taken to be 8. 315 J/K mol or a more precise value can be obtained from literature. Temperature, T, is the standard state temperature=25C. Change in moles of gas, , 3) From equation 3 we can see that the change in moles of gas is =12-14. 5=-2. 5 At this point we have enough information to calculate the standard heat of combustion! Experimental Setup 1. Make sure all connections to electrical outlet are disconnected. 2. Make sure all the parts to the bomb calorimeter are at hand. 3. Make a sample pellet (Figure1) using a pellet press. 4. Fuse a metal wire into the pellet of the chemical whose heat of combustion is to be determined 5. Attach the ends of the wire onto the two center poles of the cap that is screwed onto the bomb cavity as show in Figure2. Screw the lid onto the bomb cavity (make sure that the lid is on tight). At this point your bomb should look like the bomb in Figure3. Warning: DO NOT ALLOW THE BOMB TO SHAKE ONCE THE PRESSURE INSIDE IT HAS BEEN INCREASED. 7. Close the bomb valve and raise the pressure inside the bomb with the help of a pressure tank until 25 atm is reached. 8. Purge the bomb of the Nitrogen gas by opening the pressure release valve (Figure3) and releasing the gas. Point the bomb away from yourself and others while purging it of Nitrogen gas. 9. Raise the pressure inside the bomb with the help of a pressure tank until 25 atm is reached. 10. Attach the electrodes to the electrode slots on the cap shown in Figure 3. 11. Place bomb in metal pail placed inside the calorimeter jacket, filled with 1L of Distilled water as show in Figure 4. 12. Place the calorimeter lid on top of jacket, ensuring that the thermometer and stirrer are inside the water as show in Figure4. 13. Attach the stirrer belt to the apparatus (Figure4) and plug the stirrer into electrical outlet. 14. Plug in the ignition unit. Running the experiment 16. Start the stirrer. 17. Begin taking temperature reading with the thermometer every 10 seconds. 18. Allow system to run for 5-10 minutes. 19. Ignite the pellet with the ignition unit and continue to measure the temperature until 5 minutes after the temperature peaks. 20. Unplug all the electrical connections. 21. Next remove jacket lid, and remove the bomb from the water 22. In a designated area of the class room release the gas inside of the bomb by opening the pressure release valve. 23. Once all the gas is removed, unscrew the cap and measure the mass of wire remaining, and ensure that all of the pellet was combusted 24. Begin the calculation process (refer to the theory section).

Parkinson’s Disease Essays -- Health, Diseases

Parkinson’s disease (PD) is one of the most common neurodegenerative disorders and is classified as a movement disorder with the presence of the motor symptoms bradykinesia, tremor and rigidity. The literature on the management of PD motor symptoms focuses extensively on the medical treatment and outlines the vast advancements that drug therapy has seen over the past 40 years. There are beneficial outcomes of medicinal therapy on the treatment of motor symptoms; however, extensive research also finds there is a wearing off effect as well as potential for motor and nonmotor side effects. As the pharmacological research continues their search for the ideal medical treatment model, awareness of the psychosocial symptoms and the potential burden on caregivers has also achieved much attention in the last few decades. The increasing interest in the psychosocial characteristics of the disease appears to stem from the evolving scientific knowledge of the disease and its lack of a cure. Compounding the sequelae of PD, nonmotor challenges are sometimes unrelated to the common progression of PD and dopamine deficiency. Clinical diagnosis of PD is often confounded by the psychosocial realm of the patients daily functioning and the impact it has on the care and treatment of patients. This paper summarizes the literature of PD from a psychosocial perspective. The first chapter reviews the intrinsic psychosocial symptoms of PD and how they may or may not be influenced by dopamine neurotransmitters. The second chapter examines the side effects of three commonly prescribed medications used to treat PD. The last chapter focuses on implications the disease has on the caregiver’s own personal well-being. Introduction: Parkinson’s Dise... ... cognitive, dementia, levodopa, MAO-B inhibitors, dopamine agonist + side/adverse effects and caregiver/burden/distress. All searches were limited to English language and the years 2000 - 2010. I also referred to reference lists found in articles deemed relevant to the research project. A few reviews were outside the limits of the year restriction but were included as they added to the scope of this paper. The abstracts were reviewed and deemed to be relevant for the inclusion in this literature search based on its focus and relevancy to the topics outlined in this paper. My initial search yielded over 1000 hits from the various literature databases for this paper, of which 61 were included in this review. Those that were excluded were duplicate hits found in the various databases or had a focus on an unrelated subject matter after a review of the abstract.

Language is not only the problem faced by International students in the UK

In recent years, coming to the UK have became a attractive option for students who want to get further education with the higher quality. Because the UK is famous by its impressed education in the history. However, the increasing number of international students does not mean it is undemanding to study in the UK without facing any difficulty or it is much easier than before as a oversea student. In fact, there are numerous problems they have to solve for a meaningful oversea study experience.When referring to this topic, language has always been mentioned as an unavoidable issue for these students who are far away from their motherland. But language is not the only problem faced by international students in the UK. There are many difficulties such as differences in learning and homesickness. Language can be the main problem for all the international students even if the student is a native speaker of English, such as Americans, Australians and Indians.The reason is that students who come from an English-speaking country can be proficient in daily English, but it does not mean that they can skip this obstacle. For example, although most of the students have to get a high enough score in TOEFL or IELTS for being accepted by the school they want, they may still be unfamiliar with some terms for the subject they studied (Bamford, 2008). In other words, the ability of using English can be a barrier that every international student has to overcome. Otherwise, they would be trapped in their little safe zone and ended up as a person without sufficient confidence.So language can be the main problem for international students in the UK, but precisely it is definitely not the only issue. Because obviously, it is impossible to be a good international student by such a easy way. Differences in learning will also make oversea students feel confused at the beginning of their British life. As reported by David, Brian, Anne, Claire and Sinead (2006), in some cultures it is depr ecated to raise doubts about what the teachers said, which is totally different from the academic culture in the UK.For students who have got accustomed to this way of learning, critical thinking, which plays an important role in school life in the UK, can be difficult to adapt to the new study atmosphere and it needs time to get used to it. Differences between academic cultures are inevitably driving some international students into corner. Similarly, they must force themselves to make appropriate adjustments which is required for their study in the UK, or they would be stuck in a dilemma.Learning how to behave properly in a completely different environment of study can be a serious challenge for those students who get used to keep silence and take notes without thinking of its value. Homesickness is another conspicuous problem which make international students feel troubled. The main features of homesickness can be defined as the surrounding images about home in their minds, an in tense desire to go home, a sad emotion because missing home(Adrian, 1997).For most of oversea students, it is their first time to live further from home for perhaps thousands-miles away. In other words, it is reasonable that they would feel lonely without their family especially when some bad issues happened in their homeland. If these students can not get rid of homesickness, their whole life would be exposed in danger. Similarly, students who soak themselves in the bad mood of homesickness were likely to lose their faith in life and stayed unmotivated.As the result, they would be failed in their study and also make their family and friends down, which is the last achievement they want to reach in the world. In conclusion, international students in the UK have to face many problems, including but not limited to language. Besides language, difficulties in learning and homesickness also can not be ignored. There are still many problems which did not be mentioned in this essay. So it can be hard to deal with so many problems for international students in the UK. But it is also a unique opportunity for them to upgrade themselves.

Institutional Affiliation Health Care Reform Essay

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