Different Alcohols Essay Example for Free

Different Alcohols Essay The length of time the water is heated for is important as a short period of time will not heat the water sufficiently enough to take accurate results. However, heating the water for too long will boil the water to 100i C and therefore the results will not show any trend, as this is the maximum temperature for water. I chose to heat the water for 150 seconds (2. 5min) as this was a suitable time. METHOD * Set-up apparatus as shown in diagram. Fill calorimeter with 100cmi of distilled water and record temperature in i C with thermometer for 30 seconds to allow an accurate reading. Read thermometer at eye level in order to reduce parallax error due the reflection of light through the glass.   Select burner and check the height of the flame is 4cm using a ruler. Change length of wick using tweezers to change the height of the flame.   Weigh the burner filled with the desired alcohol with the lid on it using a top pan balance. Ensure the balance is on a flat stable surface and place burner on pan gently in order to keep reading accurate. I shall use the first four alcohols in the series: methanol, ethanol, propan-1-ol and butan-1-ol. Record mass in grams to the nearest hundredth.   Clamp the calorimeter 7cm above the top of the burner and place lid on calorimeter properly. Measure the height of calorimeter above burner using a ruler. Place burner on a heat-proof mat, under calorimeter; remove burner lid and light immediately with a match. Withdraw match immediately as the heat of the wood combusting could effect the temperature of the water in the calorimeter. Begin timer immediately when wick is lit. Do not remove lid before match is lit as some alcohol may evaporate and alter the burners weight before it is lit. Plunge stirrer up and down once every 5 seconds to ensure uniform heating. During heating keep lid on calorimeter to prevent the water evaporating and heat loss.   Record waters temperature every 30 seconds by using thermometer at eye-level. Do not remove thermometer from water to take reading, as this will change its temperature.   After 150 seconds of heating extinguish flame by replacing burners lid. Record the waters final temperature in i C.   Re-weigh burner and record mass in grams to the nearest hundredth.   Repeat 3 times and take an average of results. Repeat for all four alcohols. Calculate energy released by each alcohol per gram using the formula below: Energy Released per gram= C x Mw x /\T (J/g) Mf Where, C= specific heat capacity of water (4. 17 J/gi C) Mw=mass of water (g) /\T=change in temperature (i C) Mf=Mass of fuel used (g) Calculate energy released per mol using average J/g and the following formula: Energy released per mol= Mr x J/g (J/mol) Where, Mr=molecular mass J/g=Energy released per gram (average) Safety Precautions Because this investigation involves the use of open flamed burners, I will need to be very careful in the laboratory. I will remove all loose pieces of clothing that may fall into flame and set light. I will wear safety goggles to protect my eyes as I am heating a liquid, which could spit, into my eyes when hot.   I will use a heat-proof mat to protect the workbench from the heat of the burner.   I will abide by all standard laboratory rules such as: Do not run. Results PTO CONCLUSION The graph shows that as the length of the molecule chain in an alcohol increases so to does the amount of energy it gives of when completely combusted. The curved line of best fit shows that the relationship is not proportional. The energy released increases because as the length of molecule chain increases because the larger chains only need a small input of energy to break the original bonds yet gives out a larger amount of energy when the new bonds are formed. The energy of the products is lower compared to that of the reactants in longer chain molecules than smaller ones. The results support my prediction in the way that I predicted that as the length of the chain increased so to would the energy released. However, I also predicted that the graph would show directly proportional results, which it does not. My prediction also stated that the results would be lower than the theoretical values due to heat loss which proved to be correct. EVALUATION I believe the method I used was as accurate as possible with the equipment provided, although the results do not show this. The energy released per mol values are a lot lower than the theoretical values due to heat loss. Because of the large amount of heat loss the results are quite varied and unreliable. I only encountered one anomalous result, which is highlighted in red on the results table. I believe this is because of less heat being lost during this test than the was lost during the other tests for propan-1-ol. To overcome this problem barrier could be placed around the burner to shield it from drafts and guide the heat towards the calorimeter. I believe that the results show a curve because more heat was lost for the small-chained molecules due to the lower temperatures of flame being blown away more easily than those flames with higher temperatures.

Communities Should Welcome Wal-Mart :: Critical Thinking Essays

Communities Should Welcome Wal-Mart How would you like to be penalized because you do your work too well--for example, for running your business so effectively that it attracts hordes of happy customers? Well, this is what is happening more and more frequently to Wal-Mart. Recently the West Covina, Calif., city council voted to deny the sale of land to developers who were going to build a Wal-Mart store on the site. The council was concerned that the Wal-Mart store would "threaten" other businesses and replace higher paying jobs in the area with lower-paying ones. The banning of Wal-Mart is being considered by the Los Angeles city council and has occurred in some other California cities as well as in other locations around the country. Wal-Mart is one of the most impressive success stories in the history of business. Founded some 50 years ago as a single five and dime store in a small Arkansas town, it has grown into a world-wide behemoth under the leadership of its brilliant founder, the late Sam Walton, and his able successors. It is the largest corporation in America in terms of sales, $245 billion. Wal-Mart has over 4,000 stores worldwide, employs 1.3 million people, and serves 100 million customers per week. It is quite true that Wal-Mart has been successful in outcompeting other stores which sell the same products, such as toys, clothing, and groceries. But how has it been able to do this? By discovering new ways of using computer systems and other technology to better manage its inventory and costs and reap the benefits of economy of scale. Wal-Mart is especially popular among low-income shoppers who cannot afford the prices of the more upscale stores. It has put other stores out of business, but that is the way capitalism works. The automobile replaced the horse and buggy. Sound motion picture replaced the silents. No one has a "right" to business success or a "right" to be protected from competitors through government intervention. One only has a right to try to compete through voluntary trade. In a free economy, companies that offer the best value for the dollar win and the losers invest their money elsewhere. It is also true that Wal-Mart pays lower wages than many unionized stores. But it must offer a market wage or risk its employees going elsewhere, and it deals with employees on a voluntary basis. Those who do not like its terms are free to do business elsewhere.

Discussion questions about India and Afghanistan

1)How have geographical features influence the political social and cultural development of India?The Himalayan mountains in the north of India act as a natural buffer from China. This is important, because China to the North has been a powerful country in history. The natural break has caused both nations to be separate and free from war. The Ganges river is one of the longest in the world and has been used to cultivate crops. The Ganges is the 7th longest in the world. The Ganges river becomes all the most important, because India is also home to huge stretches of deserts. The Thar is also the 7th largest desert in the world. Another important point is that India is not landlocked. So, it has had good contact with other people groups and developed a fishing industry. India also have some good natural resources – oil, metals and natural gasses.2) What factors made it possible for the Mauryan and Gupta empires to unite substantial parts of the subcontinent?One factor that made it possible for the Mauryan and Gupta Empires to unite the substantial parts of the subcontinent was that the Mauryan Empire were a highly centralized and hierarchical government with a large staff, which regulated tax. They both blossomed under the control of their rulers. They both had a large army to take over. And lastly, they both fell under the army of invaders. Both of the army used lots of war elephants and advance weapons. Gupta India (320 B.C.E-550 C.E.) and Imperial Rome (31 B.C.E.-476 C.E.) both had very distinctive methods of political control based on everything from cultural reasons to geographic limitations.3) What do the textbook authors mean by theater state?Historians' term for a state that acquires prestige and power by developing attractive cultural forms and staging elaborate public ceremonies (as well as redistributing valuable resources) to attract and bind subjects to the center.4) What are the origins of varna and jati, and why has the varna-jati system of social organization lasted so long ?What social needs did try serve, and how are these social functions addressed in out culture?Two of the most important parts that make the constitution last so long are guaranteed freedoms and ability to be adaptable. The varna system of Hindu society is described in the various Puranas and Smritis, among others. Manusmriti, is one of many Dharmashastra texts reflecting the laws and society of Maurya period India and being a reference work for the Brahmins of Bengal especially.5) What are the similarities and what are the Difference Between Jainism, Buddhism, & Hinduism?HInduism is considered the oldest religion, and encompasses all strata of society. Jainism is based upon 24 principle beliefs of hinduism and was set up as a scholarly hierarchy. Buddhism is a Philosophy of Wisdom, based or derived from the scriptures of Hinduism sans Deity worship, considered superfluous to the intellectual pursuit and application of the tenets. Buddhism is by fa r superior in its substance of followers of the three with advocates all over the world.6) What factors might explain srivijaya ability to organise a number of ecological zones into a single kingdom?Naval military forces, Srivijaya's maritime was constantly managing their trade network and always wary of potential rival ports of neighboring kingdoms. 12 months ago. Srivijaya or Sriwijaya was a powerful ancient Malay empire based on the island of Sumatra, modern day Indonesia, which influenced much of Southeast Asia. The earliest solid proof of its existence dates from the 7th century.

Benefits Of Getting Vaccinated Far Out Weigh The Risks Essay

Research Paper: In recent years there has been a movement against giving vaccines to children, that now has nearly 40% of parents in the United States following along. But it is due to these vaccines that most children today have never experienced diseases such as polio or the measles such as their grandparents have. Since they have not seen these diseases, parents feel it is unnecessary to vaccinate them for fear of developing the possible side effects or because of reports they cause autism. However, these vaccines are critical for eradicating these deadly infectious diseases, and are vitally needed to keep them under control. Which makes it absolutely necessary that children who wish to attend school have mandatory vaccinations against diseases such as polio and measles, without exception. Therefor this paper will show the benefits of getting vaccinated far out weigh the risks such as potentially saving your child s life, protecting your families, and saving your family time and money from enduring prolonged hospital stays. That the risks of getting the diseases such disfigurement, paralysis, even death, or the very serious threat posed to people with medical exemptions like those who are immunocompromised are worse than the side effects of the vaccines. And yes, vaccines do have side effects, but not one of them is autism, and there is ample scientific evidence to back it up. It is vital to everyone that the current laws for mandatory vaccination of school ageShow MoreRelatedThe Importance Of Being Vaccination1119 Words   |  5 Pagesof Being Vaccinated It is human nature to want to understand the risks of vaccinations, especially when the benefits of that vaccine are invisible. 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