Design - Potassium Dichromate Essay Example for Free

Design Potassium Dichromate Essay Introduction: The reaction that is carried out in this design practical is between acidified Potassium dichromate and Iron wool. The reaction is a redox reaction. A Redox reaction (a short way of saying reduction-oxidation reaction) is the simultaneous transfer of electrons between multiple substances. The oxidation numbers or the oxidation state of atoms is changed through the process of oxidation or reduction. Reduction is where electrons are gained to the reaction and oxidation is when electrons are lost in a reaction between substances. In this experiment Iron (or Fe) is losing two electrons meaning it undergoing oxidation. Potassium Dichromate is gaining electrons meaning it is undergoing reduction. The Iron is the Reducing agent because it gave electrons to the Potassium Dichromate. The Potassium Dichromate is the oxidising agent because it took electrons from the iron. This experiment will attempt to prove the redox reaction through experimentation. Redox half equations: x3 ( Fe à ¯Ã‚ ¿Ã‚ ½ Fe2+ + 2e- ) Cr2072- + 14H+ + 6e- à ¯Ã‚ ¿Ã‚ ½ 2Cr3+ + 7H2O Cr2072- + 14H+ + 3 Fe à ¯Ã‚ ¿Ã‚ ½ 2Cr3+ 7H2O 3Fe2+ Aim: The aim of this experiment is discover the relationship between the temperature (20à ¯Ã‚ ¿Ã‚ ½C,25à ¯Ã‚ ¿Ã‚ ½C,30à ¯Ã‚ ¿Ã‚ ½C,35à ¯Ã‚ ¿Ã‚ ½C,40à ¯Ã‚ ¿Ã‚ ½C) of the reaction between acidified Potassium Dichromate and Iron using a water bath on the rate in which the acidified Potassium Dichromate and Iron react and change colour from yellow to dark purple. The independent variable in this experiment is the temperature. The reaction will be carried out at a range of temperatures. (20à ¯Ã‚ ¿Ã‚ ½C,25à ¯Ã‚ ¿Ã‚ ½C,30à ¯Ã‚ ¿Ã‚ ½C,35à ¯Ã‚ ¿Ã‚ ½C,40à ¯Ã‚ ¿Ã‚ ½C) . The reaction will be carried out in a water bath. The temperature will be measured with an electronic thermometer and will be measured every 10 seconds to make sure the water bath is at a constant temperature in each trial. The dependent variable is the time it takes for the reaction between Potassium Dichromate and Iron wool to come to completion or to turn from yellow to green. Time will be measured with a digital stopwatch. Independent variable: Independent variable Range (à ¯Ã‚ ¿Ã‚ ½C à ¯Ã‚ ¿Ã‚ ½0.1à ¯Ã‚ ¿Ã‚ ½C) How it is measured How they are changed Temperature 20,25,30,35,40 Electronic thermometer Changing temperature of water bath Dependent variable: Dependent Variable How it is measured Problems Time Stop watch controlled by human Reaction time Constant variables: Constant variables Measurement How they are kept constant /monitored Amount of H2SO4 used 20ml à ¯Ã‚ ¿Ã‚ ½0.1 The same measuring cylinder was used Amount of Potassium Dichromate used 20ml à ¯Ã‚ ¿Ã‚ ½0.1 The same measuring cylinder was used Stirring speed Slow but constant Magnetic stirrer wasnt able to be used in water bath, so I manually stirred the solution slow and constantly Mass of wool 0.295g 0.305g à ¯Ã‚ ¿Ã‚ ½0.01 Mass of iron wool was kept as close as possible in each test Surface area of wool 6cm3 Wool was squeezed into cube shape 1cmx1cmx1cm Type/brand of wool Superior manufactures ltd Same box of Iron wool is used Air temperature 19.0à ¯Ã‚ ¿Ã‚ ½C à ¯Ã‚ ¿Ã‚ ½0.1à ¯Ã‚ ¿Ã‚ ½C Tests are carried out on same day Concentration of sulphuric acid 2.0 mol Same bottle is used in each test Concentration of potassium dichromate 0.1 mol Same solution is used in each test Colour Yellow- dark green A pilot with dark green colour is used to compare to the colour change in the trials How to ensure reliability of results: To ensure the reliability of results the temperature of the water bath and the reaction are measured very frequently (once a min). The chemicals came from the same containers as to keep concentration consistent. I did a pilot test first to see what colour I am looking for. This beaker of dark green liquid is then used to compare with the colours in the trials so I know when the reaction has come to completion. Equipment: 1) 5x 20ml Sulphuric acid-2.0mol 2) 5x 20ml Potassium Dichromate- 0.1mol 3) 5x 100ml Beakers 4) 1x Digital stop watch à ¯Ã‚ ¿Ã‚ ½ 0.5 sec 5) 1x Electronic thermometer à ¯Ã‚ ¿Ã‚ ½0.1à ¯Ã‚ ¿Ã‚ ½C 6) 1x large water bath à ¯Ã‚ ¿Ã‚ ½0.1à ¯Ã‚ ¿Ã‚ ½C 7) Approximately 2g Iron wool- split into 5x 0.300g -1cm3 -cubes Method: 1) Gather all the equipment that is listed in the equipment list provided above and prepare a table like the one shown on the following page. 2) Secondly set your water bath at 20à ¯Ã‚ ¿Ã‚ ½C. Weigh the iron with electronic scales (à ¯Ã‚ ¿Ã‚ ½0.001g) wool making and modify its mass to make it 0.300g or as close as you can get. Squeeze the iron wool so that the wool is approximately 1cmx1cmx1cm. This makes the surface area constant over the trials. 3) Next measure 20ml with a 50ml à ¯Ã‚ ¿Ã‚ ½1ml measuring cylinder of 0.1mol Potassium dichromate. Pour it into a 100ml beaker making sure to pour all drops into the beaker. Measure 20ml of 2.0mol sulphuric acid with a 50ml à ¯Ã‚ ¿Ã‚ ½1ml measuring cylinder. Pour it into the same 100ml beaker as the potassium dichromate. 4) Measure the temperature of the water bath the an electric thermometer making sure it is 20à ¯Ã‚ ¿Ã‚ ½C. When certain the temperature is constant place the beaker with the potassium dichromate and sulphuric acid into the water bath. Make sure as much of the beaker is under the water as possible but keeping enough above not to let any of the water in. Get someone else to hold the beaker down if required. 5) Measure the temperature of the potassium dichromate and sulphuric acid making sure the temperature is exactly 20à ¯Ã‚ ¿Ã‚ ½C. When satisfied this is accurate hold the stop watch in one hand and the 0.300g à ¯Ã‚ ¿Ã‚ ½0.001g iron wool in the other hand. Place the iron wool in the beaker and simultaneously push the start button on the digital stop watch. The colour should change from yellow to a dark green colour. As soon as you are satisfied the colour has changed to the dark green colour push the stop button on the digital stop watch. Record this time in your pre prepared data table. 6) Next repeat steeps (2-5) 5 times with the same chemicals. These will be the five trials. 7) Repeat steps (2-6) 5 times but now change the water bath temperature. The range of temperatures are ). Record all the data in the table you have prepared. Data Table: Raw data table showing the effect of a change on temperature on the rate in which the reaction between acidified Potassium Dichromate and Iron wool occurs.

Lean Management :: Business, Manufacturing

Lean management is a thought process and a philosophy, not a tool, used to look at a business weather it is manufacturing, service or any other activity with a supplier and a customer relation with the goal of eliminating non-value added tasks (Womack, Jones, Ross, 1990). The principles of lean production include teamwork, communication, efficient use of resources and continuous improvement (Kaizen). It can be said that they pioneered the idea of applying the concepts outside of manufacturing environments. The objective of lean production is a system for organising and managing product development, operations, suppliers, and customer relation that requires less human effort, less space, less capital, less material and less time to make products with fewer defects to precise customer desires, compared with the previous system of mass production (Marchwinski & Shook, 2004). The concepts of both Ohno (1988) and Womack and Jones (2003) search for ways to reduce lead time by eliminating w aste it can be said that the terms â€Å"Lean† and â€Å"Toyota Production System† are synonymous. Lean management is not restricted to the actions that take place in the manufacturing function of a company, rather it relates to activities range from product development, procurement and manufacturing over to distribution. Together these areas create the lean enterprise. The ultimate goal of implementing lean production in an organization is to have the customer in focus when improving productivity, enhancing quality, shortening lead times, reducing costs etc. These are factors representing the performance of a lean production system. The determinants of a lean production system are the actions taken, the principles implemented and the changes made to the organization to achieve the desired performance (Karlsson & Ahlstrom, 1996) There are multiple ways to combine the individual practices to represent the multi-dimensional nature of lean manufacturing. In combining these practices, the researcher has to compete with the technique used to combine and the actual content of the combinations. The dominant method in operations management literature has been to use exploratory or confirmatory factor analysis to combine individual practices in a multiplicative function to form orthogonal and unidimensional factors (Flynn et al., 1995; Cua et al., 2001; Shah & Goldstein, 2006). A review of research from organization theory, and labour and human resource management shows less reliance on factor analysis and offers multiple ways for combining individual practices and creating an index. One such method is the additive index used by Osterman (1994) and MacDuffie (1995) in developing â€Å"bundles† of interrelated human-resource management practices.

What Does Fitzgerald Establish in the Opening of the Great Gatsby?

What does Fitzgerald establish in this opening? In the opening of The Great Gatsby, Fitzgerald establishes to readers that the book will be narrated by a man who supposedly ‘reserve[s] all judgments’.Through Nick, Fitzgerald establishes the hypocrisy and possible unreliability of the narrator – he makes judgments despite claiming that he ‘reserves’ them (saying ‘the intimate revelations of young men’ are ‘plagiaristic and marred by obvious suppressions’); the ambivalence of the narrator (and consequently the reader) towards life in the East, for which he has both an ‘unaffected scorn’ and fascination; and ultimately how the ‘foul dust’ that surrounded Gatsby, and indeed the American dream has diminished the ‘infinite hope’ of humanity to come to nothing.Fitzgerald immediately establishes that Nick is a privileged person, who has had ‘advantages’ that other people did not. He was educated at Yale, and as such he has connections to some ‘enormously rich’ people, among them being Tom and Daisy Buchanan. At the same time, however, readers are made aware that Nick chooses to ‘reserve all judgments’, which he claims has made him ‘privy to the secret griefs of wild, unknown men’.There are times when Gatsby, Daisy, and Tom share confidences in him, which consequently allows Nick to see both the hollowness of Daisy’s (and indirectly humanity’s) ‘sophisticat[ion]’, as well as the ‘extraordinary gift of hope’ that Gatsby possesses. This also makes readers aware of these different characteristics, and through Nick, readers can form their own judgments of the different characters. Although Nick claims to ‘reserve’ judgments, Nick makes or encourages judgments throughout the opening (‘the intimate revelations of young men†¦ are usually plagiaristic and marred by ob vious suppressions’).He boasts of his tolerance, and then immediately asserts that it has a ‘limit’, encouraging readers to question just how true his statements and claims really are. Fitzgerald establishes hypocrisy in Nick, the narrator, and forces readers to consider just how reliable he is in terms of telling his story. Throughout the book, Nick continues to make judgments about people (for example, referring to Gatsby’s partygoers as a ‘rotten crowd’), and readers must constantly ask themselves just how reliable what they read is. The theme of hope, of believing in something better, is established when Nick refers to reserving judgments. Reserving judgments is a matter of infinite hope’ illustrates the optimism that Nick hopes he can have, that by reserving judgments he hopes someone can better themselves. Perhaps it is this ‘infinite optimism’ that keeps Nick fascinated by Gatsby, and subsequently life in the East. N ick is at first ambivalent regarding these wealthy individuals, having an ‘unaffected scorn’ for everything that Gatsby represents, but also a borderline obsession (which he untruthfully claims as ‘casual’) for the lifestyle and people.He is disgusted by the moral decay of the East, but enjoys the fast-paced lifestyle; this is accurately described by how Nick was ‘flattered to go to places with [Jordan Baker] because†¦ everyone knew her name. ’ Despite this, Nick’s optimism and hope is reflected in Gatsby, who is ‘gorgeous’ and possesses a ‘gift for hope’. This hope however ultimately comes to nothing, as Nick realizes the hollowness and immorality of life in East, and wanted the world ‘to be at a sort of moral attention forever’.This letdown links closely to Gatsby’s dream of Daisy that has gone ‘beyond everything’; Gatsby had built an ‘illusion’ that had a â⠂¬Ëœcolossal vitality’, of which Daisy had no hope of satisfying (‘no amount of fire or freshness can challenge what a man can store up in his ghostly heart’). Nick states that ‘Gatsby turned out all right in the end’, yet Gatsby dies. This hints at the cynicism that Nick develops towards humanity after he sees the ‘foul dust’ that ‘floated in the wake of [Gatsby’s] dreams’ – the hollowness, the materialism, the moral decay.Daisy is eventually shown to be materialistic, and she chooses the ‘revolting’ Tom over Gatsby in a matter of minutes, causing Gatsby’s dream to fall apart irreparably. Gatsby had ‘added to his fantasies’, had poured so much into his single goal of winning Daisy, that when it was destroyed, he had nothing left to live for. Fitzgerald finishes the opening by hinting at how the people around Gatsby (the ‘foul dust’) and their actions led Nick to lo se faith in humanity and to ‘temporarily close out’ his interest in the ‘shortwinded elations of men’.In his opening, Fitzgerald establishes the questionable nature of the information transmitted to readers through Nick’s ironic statements, while also foreshadowing what is to come. The ‘intimate revelations’ and ‘scorn’ of Nick towards life in the East is overlapped with fascination, and it is ultimately established that despite his ‘tolerance’, the hollowness and immorality of the ‘foul dust’ that ‘preyed on’ Gatsby and the ‘last and greatest of human dreams’ made Nick lose faith in humanity.

Supply Chain Management ( Scm ) - 1151 Words

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As we can see in the Figure 2, the supply chain is the integrated network of all kinds of facilities and distribution options involves in transferring row materials to the intermediate and final products consumed by end customers. Different kinds of row material are provided by several suppliers to the manufactory. The manufactory is generally comprised with six part, namely Logistics, Purchasing, Production, R D, Finance, and Marketing Sales. The final product are sold to the end-customers directly or via the vendors. Moreover, there are two flows from top to button, production flow and financeShow MoreRelatedSupply Chain Management ( Scm )1992 Words   |  8 Pages1. Introduction Supply chain management (SCM) is a massive topic of interest and has been trending ever since the advent of globalisation. 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