Hydrogen Gas Lab Essay Example for Free

Hydrogen Gas Lab Essay * For the mass, an uncertainty of0.01g was used, as the uncertainty was stated on the weighing machine. * For the volume, an uncertainty of0.05mL was used, as it was half the smallest increment on the graduated cylinder. * For the temperature, an uncertainty of0.5 was used, as it was half the smallest increment on the thermometer. Sample Calculation Converting mL to L Data Processing: Magnesium+HCl Reaction -Finding the molar volume at STP of hydrogen gas when HCl is reacted with magnesium. Finding Pressure of (Pressure of H2O at 21=0.02763) Finding Volume of at STP 0.002 Sample Calculation Finding Uncertainty for Finding moles of Moles of Finding Molar Volume of at STP. Zinc+HCl Reaction Experimentally calculating molar mass of zinc using the ideal gas laws. Finding Pressure of (Pressure of H2O at 21=0.02763) Finding Moles of Determining Molar Mass of Zn Conclusion: In conclusion it was found that the molar volume of hydrogen gas that was produced when hydrochloric acid reacted with magnesium was 19L/mol3. Ideally it should be 22.4L/mol according to the ideal gas laws. There is a percent difference of 15% between the two values. But if uncertainties are considered the percent difference is reduced to 2%. This is an acceptable value because the actual value of 22.4L/mol is an approximation in ideal conditions according to the ideal gas laws. The ideal gas laws dont take into consideration the attractive forces between atoms, or the volume of the atoms. And most likely if those factors were considered then the percent difference would be 0%. For the second part of the experiment it was experimentally found using the ideal gas laws that the molar mass of zinc is 124 g/mol. When compared with the actual value of 65g/mol, there is a percent difference of 90%. And even if uncertainties are considered, the percent difference is only reduced to 64%. This is too big; therefore the data is rendered unreliable. There were quite a few weaknesses and limitations in this lab. First of all the volume of H2O mixed in with the H2 gas was not considered. Had it been considered, then the volume found at STP would have been lower, and it would give a more accurate measurement to what the experimental value is. Another weakness in this lab was the fact that the molar mass of zinc was twice as big as its accepted value. The most likely reason for this is that when the zinc reacted, it is likely that some of the hydrogen gas was not in the beaker, but the hydrogen gas escaped into the air. That is why when the formula n=PV/RT was used, the volume in the numerator was half as big as it should be, which in turn caused the calculated molar mass to double. So it can be assumed that approximately half the hydrogen gas escaped into the air. Another weakness was the fact that the apparatus was left over night, and so if there was a microscopic hole or crack, then the chances of the hydrogen escaping is very high. This would be true because, and since hydrogen has the lowest molar mass of all the elements, it would have a very high velocity, and so it is possible that the hydrogen gas was able to escape through a microscopic hole at a fast rate because it has such a high velocity. Not only that, but since it was left overnight, it would have had more time to escape the beaker. There are a number of ways that this lab could be improved. First of all, a new graduated cylinder should be used to ensure that there are no cracks or holes through which the hydrogen gas can escape. Along with that the apparatus should not be left out overnight, but instead the reaction should be speeded up by heating up the apparatus, and then taking the measurements of the volume of gas every 1 minute. This in turn would decrease the amount of energy lost to the environment, and it would end up giving more accurate results. Next time, the volume of should also be considered. A percentage value can be used, since we know the pressure that gives, that pressure can be converted into a percent, and multiplies by the total volume, and then inversed. This in turn will in turn give the volume of .This will hold true because V=nRT/P, so pressure and volume are inversely proportional, and since nRT is a constant V and P have to change accordingly.

An Overview of Aging and Existing Cultural Differences Essay -- essays

An Overview of Aging and Existing Cultural Differences Society predetermines a specific life course for each person of their community. Missing any stage of this course is detrimental to the development of the human life. But not all societies have these stages of life; ergo different cultures define stages differently. The stages of the life course are childhood, adolescence, adulthood, young adulthood and middle adulthood, old age and death. Society thinks of childhood as the first twelve years of life. In most cultures it is known as the time of autonomy from the weight of the grown-up world. But in other societies, such as Taiwan and Indonesia, childhood is seen as another occasion to send someone to work. The children do not have a normal childhood life of playing house and Barbie’s; instead they are in factories making shoes for approximately fifty cents an hour. In our society, ‘our concept of childhood is grounded in significant biological differences that set the young from the old’ (Macionis & Gerber, 2002).   Ã‚  Ã‚  Ã‚  Ã‚  The next stage of the life course is adolescence. This is the time where kids are in between childhood and adulthood. The preteen and teenage years comprise the stage of life when young people establish some independence and learn specialized skills required for adulthood (Macionis & Gerber, 2002). Adolescence is related with social and emotional confusion; young people have conflicts with their parents, and try to develop their own sense of identity. Adolescence is a product of culture. A study that was done in the 1920’s by Margaret Mead on the Samoan Islands shows that there was little stress among teenagers; their children appeared to move easily into adult standing. Our society, however, defines childhood and adulthood more in opposing terms, making transition between the two stages of life more difficult (Macionis & Gerber, 2002). The experience of adolescence also varies according to social standing and background. Following adolescence comes adulthood which is made up of young adulthood and middle adulthood. ‘Adulthood is the period during which most of life’s accomplishments typically occur, including pursuing careers and raising families’ (Macionis & Gerber, 2002). Young adulthood goes from age twenty to about age forty. This is generally a time of engaging in many goals set earlier ... ... & Gerber 2002). On the other hand, the prevalence of depression & dementia in Japan may be lower than in the West, which implies that culture may exert a protective influence (Dein & Huline-Dickens, 1997). Social isolation may be less likely in the Japanese culture because children often live with their elderly parents; whereas in Canada, elderly parents are often housed in nursing homes or assisted living accommodations. References AFS. (2000). Where in the World. Retrieved April 5, 2003, from http://www.afs.org.au/ where_detail.html?cou_code=JPN Dein, S. & Huline-Dickens, S. (1997). Cultural aspects of aging and psychopathology. Aging-and-Mental-Health, 1(2)112-120. Macionis, J.J & Gerber, L.M (2002). Sociology (4th ed.) Toronto, Ontario: Prentice Hall. Masud, Chika. (1999) Elderly Welfare in Japan. Retrieved April 5, 2003, from http://user pages.umbc.edu/~cmasud1/sowk.html Rosenberg, Matt. (2000). World Life Expectancy Chart. Retrieved April 5, 2003, from http://geography.about.com/library/weekly/aa042000b.htm Traphagan, J.W. (2000). Reproducing elder male power through ritual performance in Japan. Journal of Cross Cultural Gerontology, 15(2)81-97. An Overview of Aging and Existing Cultural Differences Essay -- essays An Overview of Aging and Existing Cultural Differences Society predetermines a specific life course for each person of their community. Missing any stage of this course is detrimental to the development of the human life. But not all societies have these stages of life; ergo different cultures define stages differently. The stages of the life course are childhood, adolescence, adulthood, young adulthood and middle adulthood, old age and death. Society thinks of childhood as the first twelve years of life. In most cultures it is known as the time of autonomy from the weight of the grown-up world. But in other societies, such as Taiwan and Indonesia, childhood is seen as another occasion to send someone to work. The children do not have a normal childhood life of playing house and Barbie’s; instead they are in factories making shoes for approximately fifty cents an hour. In our society, ‘our concept of childhood is grounded in significant biological differences that set the young from the old’ (Macionis & Gerber, 2002).   Ã‚  Ã‚  Ã‚  Ã‚  The next stage of the life course is adolescence. This is the time where kids are in between childhood and adulthood. The preteen and teenage years comprise the stage of life when young people establish some independence and learn specialized skills required for adulthood (Macionis & Gerber, 2002). Adolescence is related with social and emotional confusion; young people have conflicts with their parents, and try to develop their own sense of identity. Adolescence is a product of culture. A study that was done in the 1920’s by Margaret Mead on the Samoan Islands shows that there was little stress among teenagers; their children appeared to move easily into adult standing. Our society, however, defines childhood and adulthood more in opposing terms, making transition between the two stages of life more difficult (Macionis & Gerber, 2002). The experience of adolescence also varies according to social standing and background. Following adolescence comes adulthood which is made up of young adulthood and middle adulthood. ‘Adulthood is the period during which most of life’s accomplishments typically occur, including pursuing careers and raising families’ (Macionis & Gerber, 2002). Young adulthood goes from age twenty to about age forty. This is generally a time of engaging in many goals set earlier ... ... & Gerber 2002). On the other hand, the prevalence of depression & dementia in Japan may be lower than in the West, which implies that culture may exert a protective influence (Dein & Huline-Dickens, 1997). Social isolation may be less likely in the Japanese culture because children often live with their elderly parents; whereas in Canada, elderly parents are often housed in nursing homes or assisted living accommodations. References AFS. (2000). Where in the World. Retrieved April 5, 2003, from http://www.afs.org.au/ where_detail.html?cou_code=JPN Dein, S. & Huline-Dickens, S. (1997). Cultural aspects of aging and psychopathology. Aging-and-Mental-Health, 1(2)112-120. Macionis, J.J & Gerber, L.M (2002). Sociology (4th ed.) Toronto, Ontario: Prentice Hall. Masud, Chika. (1999) Elderly Welfare in Japan. Retrieved April 5, 2003, from http://user pages.umbc.edu/~cmasud1/sowk.html Rosenberg, Matt. (2000). World Life Expectancy Chart. Retrieved April 5, 2003, from http://geography.about.com/library/weekly/aa042000b.htm Traphagan, J.W. (2000). Reproducing elder male power through ritual performance in Japan. Journal of Cross Cultural Gerontology, 15(2)81-97.

Sun and Late Evening Light

Not a cloud sailed on that particular Sunday evening. The climbers, John and Mary had reached the tops of the cliffs as the sun was setting. They looked over the town to one side and the water on the other. The whole scene appeared strikingly beautiful in the late evening light, for it was sunset. Their hearts began to fill with emotions as the vast open sky started to turn from a baby blue to an autumn red, the clouds changed from cotton white to a flaming yellow orange giving the clouds a fluorescent laser lined effect.Birds chirped melodiously while flying away to their homes in the pleasant breeze, they too enjoying the spectacular sight. The crystal clear water sparkled like diamonds. Everything was almost still and the effect of the light made the scene look like one in a painting. It was so perfect. The climbers gazed upon the picturous scene as the autumn sky turned darker. The sun seemed to be at peace, making the climbers feel good and warm.The sun slowly began to fade away , as if it were about to fall off the edge of the water. John and Mary suddenly began to feel alive as they sat on the hill to take in the epic event right before them, they felt alive, reborn and inspired. They slowly watched the autumn red sun disappear behind the murky blue sea and said to themselves, what a glorious sunset. One that would be etched in their memories for life.

Organizational Behavior - What Are the Sources of Conflict...

Need Answer Sheet of this Question paper, contact aravind.banakar@gmail.com www.mbacasestudyanswers.com ARAVIND – 09901366442 – 09902787224 Organizational Behavior Q1. Do you believe people are really getting smarter? Why or why not? Q2. Which of the factors explaining the Flynn Effect do you buy? Q3. Are there any societal advantages of disadvantages to the Flynn Effect? Q4. What performance problems is the captain trying to correct? Q5. Use the MARS model of individual behavior and performance to diagnose the possible causes of the unacceptable behavior. Q6. Has the captain considered all possible solutions to the problem? If not, what else might be done? Q7. Identify the stressors in John Breckenridge’s†¦show more content†¦Q16. What are the sources of conflict for these conflict incidents? Q17. What conflict management style(s) did Lapierre, the international team, and Gushin use to resolve these conflicts? What style(s) would have worked best in the situation? Q18. Name two motivating factors at RBS. Q19. Describe the differences between the theories of Taylor and Maslow. Q20. How does RBS’ Total Reward package fulfill Maslow’s higher levels of motivation? Q21. How does Total Reward contribute to RBS’ overall strategy? Q22. Explain what is meant by a premium brand. Q23. Describe the difference between an aim and an objective Q24. Outline the purpose of Kellogg’s work with the ASA. Q25. Using examples to support your dialogue, evaluate how Kellogg communicates and discuss how this enables it to position its brand. Q26. What is Kaizen? I low is this different from a one-step leap forward? Q27. How is Kaizen expected to help Leyland Trucks to increase its market share? Q28. How does Leland Trucks measure Its continuous improvement? Can you suggest K KPls for another type of business organisation e.g. a retailer or a leisure centre’? Q29. 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