Rates of reaction experiments Essay Example for Free

Rates of reaction experiments Essay I was planning to observe each reaction for 10 minutes and was able to do so because the reactions started getting slow after a while I had a few problems during my experiment. The size of the chips was not exactly the same, each group was made up of chips of approximately equal sizes and this is not exactly accurate. In stirring the experiment we had to be careful of stirring it evenly and not aggravating the reaction. The experiment could have been improved in various ways. Using beads of limestone can solve the problem of unequal size of particles. Using a magnetic stirrer can be used solve the problem of uneven stirring of reactants. The use of a more accurate scale helps in solving the problem of reading off measurements from the measuring cylinder. Drawing the curves of best fit was an accurate step I took. My graphs helped in proving my aim, A distinctive trend is shown in the graph as clearly show that small particles react faster than large particles. I was interested in this experiment when I first started. I was interested in seeing changes in the reactants at the end of the reaction. I was very satisfied when I found out that my predictions were correct. The effect of concentration on Rate of Reaction Aim In this experiment my aim is to find out whether rate of reaction increases when concentration in a reaction is increased. Word equation Sodium Thiosulphate + Hydrochloric Acid Sodium Chloride + Sulphur Oxide + Water + Sulphur Chemical formula Na2S203(aq) + 2HCl(aq) 2NaCl(aq) + SO2(g) + H2O(l) + S(s) This reaction usually produces a white precipitate, which is the Sulphur and a putrid smell, which is the sodium chloride. Two main factors are needed in this reaction for it to succeed. The first, being that the reactant particles must meet and collide. If no collisions take place then the reaction cannot happen. Secondly the reaction must have enough energy to form a product. The activation energy is the most minimum amount of energy that is needed for a product to be formed. Once the solution has become totally opaque the reaction is complete. This means all the reactant has been used up and the reaction is complete. We can see this if a piece of card with a cross on it is placed under the conical flask. Once the cross is completely obscured from vision, if looking through the conical flask to the bottom, the reaction has taken place. The time it takes for this to happen is measured as the rate of reaction. Purpose of this experiment The purpose of this experiment is to record how long it takes for the cross under the conical flask to disappear under different concentrations. We have chosen sodium thiosulphate to use in different concentrations from a range of 10 ml to 40 ml. I believe 4 concentrations will be a sufficient amount although more can be taken to further the investigation Apparatus needed for this experiment are: Conical Flask stopwatch White tile marked With X . Chemical needed for the experiment are: 1) Sodium thiosulphate 2) Water (distilled) 3) Hydrochloric Acid Fair test I will need to keep in order to get correct results and to do this I need to keep in mind a list of variables, which are: The temperature of apparatus should not change Try to control the surface area of the reaction Try and judge accurately when the X mark is disappearing Fixed amount of Sodium thiosulphate and water should be added Prediction I predict that when the concentration of the acid is raised, the rate of the reaction will increase. This is because, when the concentration of acid is higher, more acid particles are present in a given volume of the solution, therefore, more acid particles are available to collide with HCl particles. This consequently increases the chances of successful collisions (those resulting in a reaction) occurring. As the collision theory states, the more collisions that occur in a period of time, the faster the rate of the reaction. This is because the reaction only occurs when Hydrochloric acid and Sodium thiosulphate particles collide each other Safety. As safety is the number one priority in this experiment, many safety precautions were taken to make it as safe as possible   Goggles were worn to make sure that eyes were protected.   Hair and loose jewelry were tied up.   A safe distant was kept in case of any spillages.   Any spillages on clothes and skin were rinsed thoroughly immediately. Any spillages on work surfaces and on the floor were mopped up with a damp paper towel. As Sulphur Dioxide can appear to be a hazardous gas, windows and doors were opened to keep maximum ventilation in the room. Method 40 ml of Sodium thiosulphate should be poured in the flask Then 10 ml of HCl should be poured into another flask 10 ml of distilled water should be poured onto another flask Put a tile containing an X mark under the sodium thiosulphate flask Then mix all these 3 chemicals into one such as pour the 10 ml of water and 10 ml of HCl onto the flask containing sodium thiosulphate. As soon as the reaction starts put the stopwatch on After we saw the reaction between started forming white precipitate which made the X mark look dimmer and dimmer to finally no X mark. As soon as the X mark is not seeable stop the stopwatch and record the time Everytime we finish a reaction we had to use another flask Everytime we start another reaction the concentration of sodium thiosulphate we decrease it by 10 ml and increase water by 10 ml During the experiments the amount of |Hydrochloric acid always remains the same at 10 ml The steps are the same for every new reaction on this experiment whether if the concentration even changes Preliminary work Before conducting a real experiment I will do a Preliminary test to check whether the experiment will work out. I have used the same method as shown above and theses are the results I obtained Volume of sodium thiosulphate (ml) water (ml) Hydrochloric acid (ml) Time it takes for X to vanish 3secs Experiment diagram Results The table below shows the results of my real experiment. The experiment was done for 3 times to get the average time taken which can make it even more accurate Na2S2O3 (Ml) H2O (Ml) Volume of HCl (Ml) Trial 1 Time taken (Seconds) Trial 2 Time taken (Seconds) Trial 3. Time taken (Seconds) Average Time taken (Seconds) 40 ml 10 ml 10 ml   000 Conclusion After conducting my experiment and while looking at my results I feel that my predictions were true because I predicted that when the concentration is high the reaction will be fast compared to the reaction with less concentration and same in my result I saw when sodium thiosulphate is 40 ml and water is 10ml the reaction takes 48. 83 seconds but when water is at 40 ml and sodium thiosulphate is at 10 ml the reaction takes 194. 00 seconds Analysis As you can see from the results in the section before, the graphs and recordings clearly show that the concentration does affect the rate of the reaction. As the concentration increases, the rate of reaction speeds up as well. The following graphs clearly state that where the sodium thiosulphate was most dilute, and was at the concentration of 10ml, the rate of reaction took the longest on average and in every experiment taken. The graphs also show that the rate of reaction happened the quickest when the Na2S203 was at its highest concentration. As you can see in the graph, the graph takes a negative correlation in form. The rate of reaction time starts off highest because of the low concentration. As the reactant particles are further apart and there are more spectator ions present, getting in the way of the reaction. These ions do not take part in the reaction but can slow it down as the do act as an obstruction. This makes it very hard fro collisions to take place. This prevents the reaction from happening quickly and stops the product from forming quickly. As the concentration slowly increases, the number of spectator ions decreases in the same given volume, which in the experiment is 10cm3. This makes it more likely and easier for collisions to actually occur. This being as it is, it means that the reaction happens quicker and so the products are formed quicker as well. Even though the rates of reaction for the different concentrations were all very different, the cross on the card eventually disappeared in every experiment. The cross did not really disappear though. This is just a phrase used. What really happened was that the solid Sulphur that is formed as a precipitate of the reactions, shields our view and it is an opaque substance. The Sulphur is a milky yellow colour and can be seen when emptying out the contents of the conical flask. It sometimes can leave a residue on the inside of the flask. The rate of reaction also depends on how quickly all the Sulphur is formed as an end product. This can be dependent on the concentration as well. If there are more particles in a given volume there are going to be more atoms that need to bond to make the product. Aim My aim for this coursework is see whether rate of a chemical reaction is affected by the addition of a catalyst in the reaction How a catalyst works There are many ways in which we are able to speed up the rate of reactions. A catalyst can either increase or decrease the rate of reaction. A positive catalyst lowers activation energy. The particles, therefore, need less energy to react and the process proceeds more quickly. A negative catalyst (an inhibitor) slows down the rate of a chemical reaction by doing the exact opposite. However, it is important to realize that the catalyst itself does not take place in the reaction and it is, therefore, not used up in the reaction. Below is an energy diagram showing the presence of a catalyst. The graph shows the effect of a positive catalyst on the activation energy. When you use a catalyst, there is as much catalyst at the end of the reaction as there was at the beginning. The catalyst is used over and over again. As catalysts work so fast and are used again and again, it is only necessary to have small quantities of catalyst present to make a chemical reaction go faster. Solid catalysts work by providing a surface onto which the reactant particles can attach, react, rearrange and then leave. Catalysts work in a very similar way to increasing surface area, when it comes to the rate of reaction. Catalysts are no different. If you want a solid catalyst to be as effective as possible, it should have the largest surface area possible. By putting holes in the catalyst, it will have a large surface area and be more effective at catalyzing a particular reaction than if it was just a solid lump. Apparatus needed for the experiment Delivery Tubes Test Tubes Test tube clamp Stop watch Stand Chemicals used in the experiment A) Hydrogen Peroxide B) Potato Chippings Fair Test: Fair test must be kept in mind to promote accurate results. For this reason I had to keep: The same mass for the catalyst The temperature during the experiment shouldnt change Concentration should remain the same Prediction I can predict that when the catalyst will be added to the reaction the reaction will be quicker and faster because of the collision moving faster. I predicted this because when I learnt about catalyst the fist thing that was taught to me was that catalyst increase any kind of reactions Formula Hydrogen Peroxide water + Oxygen 2H2O2 (aq) H20( l ) + O2 ( g ) Method For this experiment the catalyst we will be using is Potato. And it will be cut into pieces of 1cm The method we done our experiment is show below: 1) First we need to set up all the apparatus we need during the experiment 2) Put Hydrogen Peroxide inside the test tube and add Potato chippings (catalyst) 3) Heat the te.

Federal Reserve :: Economics

The Federal Reserve is the central bank of the United States. It was created by Congress to provide the nation with a safer, more flexible and more stable monetary and financial system. The Federal Reserve was created on December 23, 1913, with the signing of the Federal Reserve Act by President Woodrow Wilson. Today, the Federal Reserve’s duties fall into four general areas:conducting the nation’s monetary policy by influencing money and credit conditions in the economy in pursuit of full employment and stable prices, regulating banking institutions to ensure the safety of the nation’s banking and financial system and to protect the credit rights of consumers, maintaining the stability of the financial system and providing certain financial services to the U.S. government, to the public, to financial institutions and to foreign official institutions.   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  The structure of the Federal Reserve was designed by Congress to give it a broad perspective on the economy and on economic activity in all parts of the nation. It is composed of a central government agency(Board of Governors) in Washington D.C., 12 regional Reserve Banks, located in major cities around the nation.   Ã‚  Ã‚  Ã‚  Ã‚     Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  The Federal Reserve’s income comes from the interest on U.S. government securities that it has acquired through open market operations. Other sources of income are the interest on foreign currency investments. Once the Federal Reserve has paid its expenses, it then turns over the rest of its earnings to the U.S. Federal Reserve :: Economics The Federal Reserve is the central bank of the United States. It was created by Congress to provide the nation with a safer, more flexible and more stable monetary and financial system. The Federal Reserve was created on December 23, 1913, with the signing of the Federal Reserve Act by President Woodrow Wilson. Today, the Federal Reserve’s duties fall into four general areas:conducting the nation’s monetary policy by influencing money and credit conditions in the economy in pursuit of full employment and stable prices, regulating banking institutions to ensure the safety of the nation’s banking and financial system and to protect the credit rights of consumers, maintaining the stability of the financial system and providing certain financial services to the U.S. government, to the public, to financial institutions and to foreign official institutions.   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  The structure of the Federal Reserve was designed by Congress to give it a broad perspective on the economy and on economic activity in all parts of the nation. It is composed of a central government agency(Board of Governors) in Washington D.C., 12 regional Reserve Banks, located in major cities around the nation.   Ã‚  Ã‚  Ã‚  Ã‚     Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  The Federal Reserve’s income comes from the interest on U.S. government securities that it has acquired through open market operations. Other sources of income are the interest on foreign currency investments. Once the Federal Reserve has paid its expenses, it then turns over the rest of its earnings to the U.S.

Tardiness: High School and Copyright

A. Background of the Study Tardiness has already become a habit of the high school students of Manresa school. Most of them come to school, attend their classes and scheduled appointments not on time. They all have their own reasons; traffic, working slow, waking up late, etc. Most of the students in Manresa School, are even residents of BF Homes. Some are even residing in the Manresa Village, and still, they are arriving late. They are residents who have been probably living in the village, or subdivision all their lives, who should have already put into consideration the usual problems they would encounter when they go to school.Many teachers get disappointed, but up to now, the students are still unaware of what they are doing. Tardiness is one of the most common causes that affect the lives of the high school students. But, how can tardiness really affect our lives as a student? Will it bring down our academic grades? This study will provide information about tardiness, what caus es it, the probable consequences of being tardy, and possible solutions to overcome, or at least help the High School students of Manresa School regarding their problem of being late. B.Statement of the Problem Prevention of tardiness among the high school students of Manresa School. C. Objectives of the Study At the end of the study, the group is expected to. . . 1. To find out why the high school students of Manresa school are tardy. 2. To prove that it is possible for the students to come to school and/or attend classes early. 3. To give solutions and prevent tardiness. D. Significance of the Study The study is very important because many people would be able to benefit from this study; namely, teachers and the tardy students themselves.During the course of this study, the group will be able to find out what the causes and effects this might have on not only the students, but also the teachers and staff. The study can also help those who are experiencing tardiness over and over a gain without being consciously aware of the reason, and may also help those who wish to conduct this kind of study in the future. The group can use this information to help anyone looking for psychological, physiological and social aspects of tardiness. Anyone who wants to know more about preventing someone from being late can make use of the information retrieved from this study.The professionals, not only the students can also experience being late. They will also be able to make use of the study, and this study can virtually benefit anyone who has to be somewhere at sometime. E. Scope and Limitation The study focuses on preventing tardiness among the high school students of Manresa school. It is a specific topic but still covers a lot of factors. The study covers ways and changes that Manresa School should follow in order to lessen the number of tardy students In order to prevent tardiness, the students must know its causes and effects in many ways.The study covers the tardiness in coming to school, attending classes and other important appointments, activities, etc. these factors are all important because the students of Manresa School should know what tardiness could do to them if it becomes a habit. F. Definition of Terms 1. Attendance (n) – the act of attending; number of persons present. 2. Authority (n) – to have the power and right to control, judge or prohibit the actions of others; to be in charge. 3. Awareness (n) – realization of something; consciousness. 4. Behavior (n) – manner of behaving or acting the aggregate of responses to nternal or external stimuli. 5. Consequence (n) – outcome; unpleasant result of an action. 6. Counsel (n) – a professional guidance service for individuals, applying the techniques of psychological testing. 7. Discipline (n) – the training of the mind and character; a branch of learning; a mode of life in accordance with rules, self-control; control, order, obedience to r ules. 8. Disturbance (n) – the act of disturbing, the state of being disturbed; commotion; something that disturbs. 9. Excessive (adj) – more than is acceptable : beyond what is considered acceptable, proper, usual or unnecessary 10.Excuse (v) – to pardon or overlook (a fault, offense, etc. ); to offer a reason or apology for (an error, fault, etc. ); to serve as a reason for; justify. 11. Habit (n) – a tendency to repeat an act again and again; a behavior pattern that has a degree of automatism. 12. Late (adj) – occurring after usual or expected time. 13. Manner (n) – a method of doing something; behavior; type or kind; habit; social behavior. 14. Misconduct (n) – formal word for improper behavior, especially by a professional person; dishonest management; improper behavior. 5. Offense (n) – the act of offending; a fault, sin or crime; the act of injuring another’s feelings; the state of being offended; assault or attac k in sports, the team members. 16. Policy (n) – any system of management based on self-interest as opposed to equity finesse in general; artifice. 17. Prevention (n) – act of intervening in order to prevent something; preventing or being prevented. 18. Procrastinate (v) – a formal word meaning to delay or put off to a later time. 19. Prolong (v) – to make longer in time; extend. 20.Responsibility (n) – the state if being responsible; ability to meet obligation, or to act without superior authority or guidance. 21. Sanction (n) – permission, approval; a penalty for breaking a law, deterrent. 22. Suspend (v) – to attach to some elevated point without support from below; to hold floating on or in a fluid, or as it on or in a fluid; to debar, usually for a time, from the exercise of an office or function or the enjoyment of a privilege. 23. Tardiness (n) – late, dilatory, overdue, delayed; slow, sluggish, leisurely, torpid. 24. Tar dy (adj. – not coming, happening etc. at the schedule or proper time; moving, acting at a slow pace. 25. Time management (n) – the concept of continuous existence; the past, present and the future ; a distinct moment or period. 26. Violation (n) – the act of violating or the state of being violated. Reference list – Anonymous. (2001). Absences, Tardiness, Excuses and Work Make-up. Retrieved August 8, 2009, from Madison city. Website: http://www. madisoncity. k12. al. us/Policies/Pages/J/JBD-Absences_Tardiness_Excuses_and_Work_Make-up. htm – Anonymous. (2009). Class tardiness.Retrieved August 8, 2009, from University Laboratory High school. Website: http://www. uni. uiuc. edu/policies/tardiness – Anonymous. (2009). Excessive tardiness in school. Retrieved August 8, 2009, from Lots of Essays. com. Website: http://www. lotsofessays. com/viewpaper/168107. html – Anonymous. (2009) School Tardiness and Absences can make A Child Fall Behind. Retrieved August 10, 2009, from New York Schools. Website: http://www. newyorkschools. com/articles/school-tardiness-and-absences-can-make-a-child-fall-behind. html – Anonymous. (2008). School Tardiness.Retrieved August 8, 2009, from Martinsville Bulletin. Website: http://www. martinsvillebulletin. com/article. cfm? ID=16932 – Anonymous. (2009). Student Tardiness and Absenteeism – A Cause for Concern. Retrieved August 9, 2009 from MTCutandPaste. com Website: http://www. mtcutandpaste. com/page. cfm? thispage=060810a2 – Anonymous. (2007) Tardiness hinders student and school success. Retrieved August 10, 2009, from Cowan Crier. Website: http://www. lausd. net/Cowan_EL/cowan%20crier/Nov%2007. pdf – Anonymous. (2002). Tardy Policy. Retrieved August 8, 2009, from the Paly Voice.Wesbite: http://voice. paly. net/view_story. php? id=2189 – Anonymous. (2003). Research on School Attendance and Tardiness. Retrieved August 12, 2009, from Google Answers . Website: http://answers. google. com/answers/threadview/id/214323. html – Anonymous. (2009). Tardiness. Retrieved August 8, 2009, from Agassi prep. Website: http://www. agassiprep. org/pdfs/tardy_policy. pdf – Anonymous. (1999). The New International Webster’s Dictionary and Thesaurus. Copyright: Trident Press International – Anonymous. (2007). Truancy and Tardiness. Retrieved August 8, 2009, from Fulton.Website: http://www. fulton. cnyric. org/policies/5000/5161. 0%20Truancy%20and%20Tardiness. pdf – Austin, M. (2003). Late For School. Copyright: Peachtree Pub Ltd – Bishop, A. (2008) Tardiness. Retrieved August 10, 2009, from a teacher grows in Chicago. Website: http://ashleyltt. blogspot. com/2008/03/tardiness. html – Burningham, J. (2008). John Patrick Norman McHennessy – The Boy Who Was Always Late. Copyright: Alfred a Knopf Inc – Cayne, B. (1989). The New Lexicon Webster’s Dictionary of the English Language. Copyright: Lexicon Publications, Inc.USA – Cosby, B. (1999). My Big Lie. Copyright: Scholastic – Friedrich, O. (2002). The Easter Bunny That Overslept. Copyright: Harpercollins Children’s Books – Geddes, Grosset. (2002). Universal Dictionary and Thesaurus. Copyright: Poland – Gray, P. (2006). Psychology. Copyright 41 Madison Ave. , New York: Worth Publishers – Gross, R. (2005). Psychology: The Science of Mind and Behavior. Copyright: Hachette Livre, UK: Hodder Arnold Publishers – Guthridge, B. Clark, M. (1999). Lucky Last Luke. Copyright: Sundance – Hargreaves, R. (2008). Little Miss Late.Copyright: Publisher: Price Stern Sloan – King, J. L. (2007). CP Time: Why Some People are Always Late. Copyright: Strebor Books Intl – Kirschner, R. Brinkman, R. (2001). Life by Design. Copyright: MC Grawltill Book Co. – Lachtman, O. (2008). Icy Watermelon / Sandia Fria. Copyright: Pinata Books – Landau, S. (2006) . Webster’s Dictionary Thesaurus and Atlas. Copyright: Typhoon International Corp. – Lindenfield, G. (2000). Self Motivation: Revised Edition. Copyright: Caledonian International Book Manufacturing ltd, Glasgow – Newman, L. Ferguson, P. (2007).The Boy Who Cried Fabulous. Copyright: Tricycle Pr – Nichols, W. Stebbens, S. Bunning, C. (2001). Random House Wesbter’s Unabridged Dictionary. Copyright: USA – Nissman, B. (2008). Teacher-Tested Classroom Management Strategies. Copyright: Merril – Mayer, J. (1999). Time Management for Dummies: 2nd Edition. Copyright: Hungry Minds, Inc. – McDonald, C. (2009). Getting Students â€Å"In School, ON TIME, everyday. † Retrieved August 8, 2009, from National Association of Elementary Principals. Website: http://www. naesp. org/resources/2/Leadership_Compass/2008/LC2009v6n3a3. pdf

Business Proposal Sample - 1527 Words

1. Executive summary This is a business proposal about our company. We have done the market research, so that we can show the true and fair information. Our company’s name is D-LIFE. The D-life, letter ‘D’ represents the meaning of DIY, dainty and diamond. It means that our products can help you DIY your life and make your life dainty and shining as if diamonds. Our company tends to sell some DIY-boxes, interesting and attractive DIY desks calendars and pasters for card cover. We regard the young university girls as our target customers. There are some shops in or near our university which sell notebooks, and card pasters. But we found that they are not very beautiful. So our products are more competitive. Our company has a clear†¦show more content†¦Our principle is â€Å"small profit, large sale volume.† ï  ¬ Place We local our booth at a prosperous spot where has large visitors flow rate on campus. The riverside of Xiang Si River is a good choice. It is the only way which most students must be passed to go back to dormitory or go to library. We can also sell our products in dormitory. It will be convenient for the students of our own college to buy our products. ï  ¬ Promotion The customers can choose either discount or free gifts when their consumption up to 35 RMB. 5. Resources 5.1 Financial / Human / Operating Resources Available ï  ¬ Financial Resources We have savings and investments which we are able to start up the business, totaling RMB 400. ï  ¬ Human Resources The four group members: Ling Zhao, Rita He, Charlene Wu, and Jack Chen. We think we can run the business independently by ourselves. ï  ¬ Operating Resources The riverside of Xiang Si river is a prosperous spot. Most of outdoor activities on our campus usually hold at there. Our dormitory is a fixed point of sales. We have notebook computer to keep accounts. 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