Effect of Molecular Weight in the Rate of Diffusion

Effect of Molecular Weight in the Rate of Diffusion Jarrel Dean A. Yecyec ABSTRACT The effect of molecular weight in the rate of diffusion was determined by placing potassium permanganate (KMnO4), potassium dichromate (K2Cr2O7), and methylene blue in a petri dish of agar-water gel with three wells. After a drop of each in well the petri dish was covered then, the diameter of the colored area was measured with three minute interval. It was measured ten times. Methylene blue has the lowest molecular weight but, Methylene blue showed the longest diameter. Thus, Molecular weight affects the rate of diffusion the higher the mass the slower the rate of diffusion. INTRODUCTION According to the experiment of diffusion, two feet glass tube was fasten horizontally to a ring stand. After moistening two cotton balls of the same size, one with hydrochloric acid and the other with ammonium hydroxide it is plugged to one end and the other end. White smoke was observed inside the tube. When you measure the distance from the cotton to the white ring, ammonium hydroxide exhibits the longer distance. Diffusion demonstrates random motion that proceeds from a region of higher concentration to lower concentration. Diffusion it is when molecules try to achieve equilibrium. Diffusion of gases always happens gradually, it takes a relatively long time. For example, when you open a bottle of perfume inside a room it will take time before a person smell it in the other side of the room. This is explained by the numerous collisions of molecules while moving from one end to another. The root-mean-square speed is a way to estimate molecular speed. We can estimate how fast a molecule move, on the average, at any temperature. By interpreting the formula it shows that the heavier the gas, the slowly its molecules move. Molecular weight it is the mass in grams of one mole of molecules of formula units of a substance. It is also called as molecular mass. The hypothesis was arrived based on previous observation, the hypothesis is if molecular weight affects the rate of diffusion then the higher the mass the slower the rate of diffusion. Agar is a polymer made up of subunits of galactose, it is also a component of some cell walls. When dissolved in boiling water and cooled, agar looks gelatinous. Potassium permanganate (KMnO4), potassium dichromate (K2Cr2O7), and methylene blue are the compounds that will be used in this experiment. This study aimed to determine the effect of molecular weight to the rate of diffusion. The specific objectives were. To describe the effect of diffusion To explain why heavier molecules tend to be slower than lighter molecules. MATERIALS AND METHODS A petri dish of agar-water gel with three wells with a diameter of 5 millimeter was prepared. Potassium permanganate (KMnO4), potassium dichromate (K2Cr2O7), and methylene blue were obtained. The color of potassium permanganate is red-violet, potassium dichromate is yellow, and methylene blue is blue this is based on observation. One drop of each prepared solution was then placed into each well and then the petri dish should be immediately covered, a dropper was used. A ruler was used for measuring the diameter of the colored area of each substance. The set up was then recorded at a regular three-minute interval for a half hour, for every interval the colored area was measured and recorded in table 4.2. A phone was used in recording the time. After thirty minutes, the colored area was measured and recorded. The zero minute and the thirty minute were compared. A graph comparing the three solutions was then plotted and analyzed. Partial rate of diffusion was calculated at each interval. The formula for the partial rate of diffusion is final minus initial diameter of colored area divided by the final minus initial time measured. The average rate of diffusion (mm/min.) will be calculated and graphed. RESULTS AND DISCUSSION As seen in Table 1 results showed that Potassium permanganate diffuse faster than the other two. There are times that they are constant showed in Figure 1. The diameter increases as time increases but there are points that there is no change in the diameter. Potassium permanganate with the lowest molecular weight is the fastest to diffuse and Methylene blue with the highest molecular weight is the slowest to diffuse. As seen in Table 2 Potassium permanganate has the highest average rate of diffusion, it is moving 0.37 millimeters per minute. It is the fastest compared to others. Figure 2 completely showed the comparison of average rate of diffusion. The hypothesis if the molecular weight affects the rate of diffusion then the higher the mass the slower the rate of diffusion is accepted. It is supported by the root-mean-square speed because you can compute for the speed of a molecule and by the experiments. Table 1. The diameter of the three solutions at a regular three-minute interval for thirty minutes. Figure 1. A line graph comparing the three solutions and showing the Effect of time in the diameter of the colored area Table 2. The partial rates of diffusion of the three solutions. Figure 2 Comparison of the partial rates of diffusion of the three solutions. SUMMARY AND CONCLUSION The effect of the molecular weight in the rate of diffusion was determined. One drop of each prepared solution was placed into each well and the diameter was measured at a regular three minute interval for a half hour. The average rate of diffusion was computed and supported the experiment. The data we gathered is credible because there is no source of error. The results showed that Potassium permanganate exhibits fast diffusion compared to others. Therefore, molecular weight affects the rate of diffusion, the heaver the compound the slower the rate of diffusion. I recommend this experiment. add more compounds with different molar weight and different kind of samples too. If you are dealing with gases try to compute the theoretical speed of a molecule by using the root-mean-square speed and compare it with the one you observed. LITERATURE CITED Dorland, W.A.M. 2012.Agar, Dorland's Medical Dictionary. Retrieved January 17, 2013 Zumdahl, S.S 1998. Chemical Principles. 3rd edition. Houghton Mifflin. A37. Chang, Raymond. Chemistry. 6th edition. New York: McGraw-Jill. p. 183-185 Duka, A.I.M, Diaz, Q.M.G, Villa, O.N. 2009. Biology 1 laboratory manual: An investigative approach. Ninth edition. UP Los Banos, College, Laguna, Philippines. No author. Diffusion and Osmosis.

Human Trafficking Essay -- Ethical Issues, Sexual Exploitation

The Trafficking Victims Protection Act of 2000 and The Trafficking Victims Protection Reauthorization Acts of 2003 and 2005 have defined sex trafficking as a commercial sexual act or acts that are induced by fraud, coercion, or in which the person to perform these sexual acts are under the age of eighteen Blackburn, Taylor and Davis (2010). The sex industry in Cambodia and Thailand consists of men, women, and children. In order for there to be enforced labor and sex trafficking there has to be forms of illegal immigration to these economies, though not all human traffickers are kidnapped or forced into sex work, many choose to do this work. Singh and Hart (2007) have labeled Thailand as a country of many prostitutes and its reputation derives from human trafficking and sexual exploitation, especially sexual exploitation of children. Sex trafficking is used to entice tourists to the country to please sexual fantasies Blackburn, Taylor and Davis (2010). Blackburn, Taylor and Davis (2010) indicate estimating human trafficking and sexual exploitation data is difficult provide. Although, it is estimated that thirty thousand children involved in the Thai sex trade is up to seventy-five thousand children younger than the age of sixteen working in brothels, bars, and nightclubs, and that Thailand’s gross income ranges in the twenty-two billion dollars. Singh and Hart (2007) claim their estimates differ from the reality of the true number of commercial sex workers. Though similar to Blackburn, Taylor and Davis (2010) they provided that the number range from sixty thousand to seventy-five thousand to four hundred thousand sex workers in Thailand. According to Singh and Hart (2007), The World Tourism Organization reported in 2004, th... ...at beach resort near Bangkok, Thailand and many pedophiles from around the world come there. Since there are organizations like Fight Against Child Exploitation which influence the prosecution of pedophiles after they return to their country. The authors state the police are a part of the sex trafficking problem in both Cambodia and Thailand because brothels pay monthly payment to the police for protection, and some brothels are private owned by government, military, or police officials. The Royal Cambodian National Police attempted to develop a special unit on human trafficking and juvenile crime, because this effect produced little progress, the entire national police department was told to get training on human trafficking, child exploitation, ethical behavior that led to corruption, and receiving serves from prostitutes Blackburn, Taylor and Davis (2010).

A seminar on “Beginning For Beginnger” Essay

A seminar on â€Å"Beginning For Beginnger† was held at DKU at Faculty of Business Managemnet. This seminar was held on 9 June 2012-06-24. This seminar was begin on 2.00Pm – 5PM. It was jointly organised by all part three student who take Mgt538 in this semester. The purpose of the Seminar was to talk about lessons and challenges in facing currunt enviroment on studies and future working enviroment. It focused mainly on the attitutes, styles and action that should be take to faced all the situation. All part three students whose take this subject are compulsory to attented this seminar. The Programme is given at DKU that situated in Faculty of Business Management. The seminar was given by Cik Noor Syuhada,caunsellor Uitm Seri Iskandar Perak. AIMS AND OBJECTIVES The seminar was structured in a way that helped participants to walk through the issues, starting from the relevance of the organisational context, along the issues that have to be addressed, the intended or assumed and finally to the actual implementation. The objectives of the seminar were to provide insight in the issues, to identify the mistake ,and to discuss the possible approaches for formulating and implementing tools that can be take. In order to encourage discussion and a more focussed exchange of information practical sessions were scheduled .During these sessions participants could ask some questions and share thoughts with each other and the speakers. THE POSITIVE IMPACTS The seminar participants agreed that : 1. This programs will help them to improve their knowledge on facing their future enviroment especially during their working enviroment. 2. Many participants were given a chance to ask any questions and they also were give a chance to share some idea or tips that will give benefits to all participants. 3. It is important that all parties to attends,it will give a common understanding about what these and other key terms mean. 4. The seminar have give them a lot of tips on attending interviews and facing interviews session that will improve their confident to facing that. THE NEGATIVE IMPACTS The side impacts that can be conclude from the seminar : 1. Some participants not focus during the seminar. 2. They playing games on their mobile phone, chatting, talking and etc. 3. Not all students have confidents to ask questions even they have intention to do so. 4. Sessions for students to discuss among themselves was not held. RECOMMENDATIONS : Some recommendations that can be take are : 1. Small group discussion can be do in oreder to give participants share or discuss among themselves about the issues on the seminar. 2. Students should be ask to switch off their phone during the seminar. 3. Try to encourage students to build up their confident to share, ask or gine opinion during the seminar. CONCLUSIONS : The feedback of the participants confirmed that the seminar was very much appreciated as well as that there is a pressing need for more practical approaches and for other opportunities to discuss the many issues. The speakers came also from different backgrounds and presented the audience with different practical experiences, insights, and views, both at an organisational and national level. It gave a good impression and understanding of the many perspectives. The seminar have improve knowlegde among participant and will benefits to them in facing their future working enviroments.

Conflicting Opinions Over the Popular Front Government in...

After the ruling of the corrupt King Alfonso XIII and the horrible massacre the army faced when it was sent to Spanish Morocco, the progressive Popular Front government was elected. In 1936, with the promise of land reform, the conservative forces gathered to plan for resistance. The Spanish left wing, on the other hand, celebrated the elections so joyfully that made the conservative military officers, capitalists and churchman worried that a much broader reform would begin. Rumors of plotting for a military coup led the Republicans to send high – ranking military officers to remote postings in order to make communication and coordination between them more challenging. However, it was not enough, the planning for a military uprising continued. When the military coup failed to gain control of the entire country, the civil war started between the Nationalists and the Republicans. The Nationalists received aid from Italy ( at the time, fascist and under the control of *******) and from the Nazi Germany. The Republicans, however, received aid from the Soviet Union and from the International Brigades (composed of volunteers from Europe and the United States). The war was the result of the polarization of the Spanish life and politics that developed over the previous decades since it’s monarchic government. Roman Catholics, businessman and landowners were the most notable components of the Nationalist side. At the time, the Republic was considered to be a danger to theShow MoreRelatedOne Significant Change That Has Occurred in the World Between 1900 and 2005. Explain the Impact This Change Has Made on Our Lives and Why It Is an Important Change.163893 Words   |  656 Pagesdeploy to demarcate historical epochs, the twentieth century does not appear to be a very coherent unit. The beginnings and ends of what we choose to call centuries are almost invariably years of little significance. But there is little agreement over when the twentieth century c.e. arrived, and there were several points both before the year 2000 (the collapse of the Soviet Union, the reunification of Germany, the surge of globalization from the mid-1990s) and afterward (9/11, or the globalRead MoreLogical Reasoning189930 Words   |  760 PagesStatements? ........................................................................... 140 Assessing a Sources Credibility .................................................................................................. 144 Seeking a Second Opinion ............................................................................................................ 147 Trust Me, I Know It on Good Authority ..................................................................................... 149 SuspendingRead MoreCase Study148348 Words   |  594 Pagesfeatured in the case studies †¢ Classic cases – over 30 case studies from previous editions of the book †¢ The Strategy Experience simulation gives you hands-on experience of strategic analysis and putting strategy into action Resources for instructors †¢ Instructor’s manual, including extensive teaching notes for cases and suggested teaching plans †¢ PowerPoint slides, containing key information and figures from the book †¢ Secure testbank containing over 600 questions †¢ Support for the Strategy ExperienceRead MoreExploring Corporate Strategy - Case164366 Words   |  658 Pagesreader to extend this linking of theory and practice further by analysing the strategic issues of speciï ¬ c organisations in much greater depth – and often providing ‘solutions’ to some of the problems or difï ¬ culties identiï ¬ ed in the case. There are also over 33 classic ca ses on the Companion Website. These are a selection of cases from recent editions of the book which remain relevant for teaching. The case studies are intended to serve as a basis for class discussion and not as an illustration of eitherRead MoreStephen P. Robbins Timothy A. Judge (2011) Organizational Behaviour 15th Edition New Jersey: Prentice Hall393164 Words   |  1573 PagesSocial Loafing Shirking? 300 Case Incident 1 Negative Aspects of Collaboration? 300 Case Incident 2 Herd Behavior and the Housing Bubble (and Collapse) 301 CONTENTS xiii 10 Understanding Work Teams 307 Why Have Teams Become So Popular? 308 Differences Between Groups and Teams 309 Types of Teams 310 Problem-Solving Teams 310 †¢ Self-Managed Work Teams 310 †¢ Cross-Functional Teams 311 †¢ Virtual Teams 312 Creating Effective Teams 312 Context: What Factors Determine Whether Teams Are