Effect of Changing Concentration on the Order of Reaction

Effect of Changing Concentration on the Order of Reaction Title : An Investigation into the Effect of Changing the Concentration by Continuous Method on the Order of Reaction Planning A. Hypotheses I predict that the rate of reaction is influenced by the concentration of the reactants; and that the rate of reaction and the concentration of reactants decrease as time intervals increase. I predict that the order of reaction is affected or influenced by the concentration of the reactant. I also predict that the change in concentration of reactants affects the rate of reaction proportionately and hence, the order of reaction. Such that, if the concentration of the reactants is reduced by half, the rate of reaction will also decrease by a certain proportion. The reaction that will be analyzed in this experiment is between a metal (magnesium ribbon) and an acid (sulfuric acid). The reaction is shown by the chemical equation below: Mg (s) + H2S04 (aq) → MgS04 (aq) + H2 (g) In this experiment, 0.15 grams of magnesium ribbon will be used in excess, together with 10 cubic centimeters of 0.3 M sulphuric acid (H2SO4). The continuous method will be used, where the metal is in excess and the reaction goes to completion. The volume of the hydrogen gas (H2) will be collected at a measured time interval of 30 seconds. These volume readings at the time intervals shall be recorded and analyzed. III. Background The rate of a reaction depends in part on the concentrations of the reactants. The rate at which a reactant or reactants is transformed into products is the change in concentration of the reactant or reactants with time, (Wilbraham, et.al., 1997). Mathematically, the rate can be expressed as: Rate = Change in Concentration of Reactants / Change in time The formula implies that the rate of disappearance of the reactants is proportional to its molar concentration. Hence: Change in Concentration of Reactants / Change in time = proportional to the concentration of reactants The reaction rate has to be experimentally determined. From the reaction rate equation, the order of reaction can be obtained. The order of reactions can be classified as zero order, first order, or second order, with respect to only one reactant. IV. Risk Assessment In this experiment, sulphuric acid (H2SO4), will be used as a reactant. Since it is a strong acid and is very corrosive, I will observe the following precautionary measures: Wear protective goggles for the eyes. Avoid pipetting the sulphuric acid by mouth. Avoid inhalation of sulfuric acid. Care in handling the acid should be observed. It should be prevented from being knocked over. V. Fair Test To ensure that the results that I will obtain in the experiment are reliable and accurate, I will observe the following: The volume measurements of the sulphuric acid reactant will be made very accurately by reading from the lower meniscus of the 10 cubic centimeter mark The bung will be securely and tightly placed to prevent the collected hydrogen gas (H2) from escaping. The weight measurements of the magnesium ribbon will be made very accurately. All materials will be thoroughly cleaned before each use in order to prevent contamination. The experiment will have 3 runs or replicates in order to attain a high reliability of results. VI. Procedure of the Experiment: Materials needed: Stopwatch for time interval measurements 100 cc gas syringe for the Hydrogen gas collection 100 cc conical flask for the sulphuric acid 100 ml graduated cylinder for measuring the sulphuric acid Analytical balance for measuring 0.15 grams of magnesium ribbon Procedure: 1. Set up the materials while making sure that they are thoroughly clean and dry. 2. Using a graduated cylinder, measure 10 cc of 0.3 Molar concentration of sulphuric acid. 3. Carefully weigh 0.15 grams of magnesium ribbon using an analytical balance to make sure that the weight measurement is accurate. 5. Put the 0.15 grams of magnesium ribbon into the conical flask with the sulphuric acid. 7. Measure the volume in cubic centimeters of hydrogen gas collected in the gas syringe at every time interval of 30 seconds. 8. Record the volume of collected hydrogen gas at each set time interval. 9. Make 2 more runs of this experiment by repeating steps 1-8 at every run. VII. Results. Below are the tabulated volume measurements at every time interval: Table 1: Volume Measurements for Run 1 The data in Table 1 were plotted in a graph below: Graph 1: Volume vs. Time (Run1) For Run 2, the data were obtained were tabulated below: Table 2: Volume Measurements for Run 2 The data in Table 2 were plotted in a graph below: Graph 2: Volume vs. Time (Run 2) For Run 3, the data were obtained were tabulated below: Table 3: Volume Measurements for Run 3 The data in Table 3 were plotted in a graph below: Graph 3: Volume vs. Time (Run3) All three graphs show the trend that as time increases, the volume of the reactant decreases, while the volume of the product increases. B. Calculation of the Concentration of Reactant From the reaction: Mg (s) + H2SO4 (aq) → MgSO4 (aq) + H2 (aq) Concentration is measured in terms of Molarity, where Molarity is equal to the number of moles of solute divided by liters of solution: Molarity = No. of moles of solute / Liters of solution For Magnesium (Mg), 0.15 grams were added to sulphuric acid. The number of moles is equal to: weight in grams divided by the formula weight. Hence, the number of moles = wt. in grams / FW. Since 0.15 grams were used, 0.15 grams should be divided by the formula weight of Magnesium (Mg), which is 24. So: 0.15 grams / 24 = 0.00625 moles for Mg. To get the molar concentration, the number of moles will be divided by the volume of the solution in liters, which is 0.01. So, the molarity of Mg is : 0.00625 / 0.01 = 0.625 M For the sulphuric acid (H2SO4) used, the molarity is 0.3 M. The number of moles of H2SO4 used is determined by multiplying the molar concentration by the volume of solution in liters. Hence: 0.3 moles/L X 0.01L = 0.003 moles. From the chemical equation of the reaction, for every 0.003 moles of H2SO4 used, the same amount of moles (0.003) of hydrogen gas (H2) is given off. The molar concentration of the hydrogen gas evolved can now be determined for each respective time interval, by dividing the number of moles by the volume obtained. For run 1: The concentration of the product can now be calculated, using the formula for reaction rate, where: Molarity = Number of moles / Liters of solution The data for the concentration of the hydrogen gas are tabulated below: Table 4: Molarity of the hydrogen gas (H2) The molarity values tabulated above are plotted in the graph below: Graph 4: Concentration vs. Time (Run1) Graph 5: Concentration vs. Time (Run 1) Showing the Gradient of the Tangent Curve The rate of reaction was calculated by measuring the gradient of the tangent of the curve above, as depicted by the red line. Hence, the gradient of the tangent is equal to 0.12 – 0.05 / 150 = 0.00046. From the rate equation, the rate constant (k) can be obtained by the formula: k = rate x [H2SO4]. So: k = (0.00046) / 0.3 = 0.153. The rate equation is: Rate = k [H2SO4] Rate = (0.153) (0.003) = 0. 000459 or 0.0046. Hence, this value is equal to the gradient of the tangent of the graph above. This shows that the rate is directly proportional to the concentration of the sulphuric acid (H2SO4). Table 5: Concentration of Gas Collected and Rate of Reaction (Run 1) The plotting of tabulated data above results to the graph below: Graph 6 Rate vs. Concentration (Run 1) The Rate –Concentration Graph for Run 1 above shows that the concentration of hydrogen gas (H2) is directly proportional to the rate of reaction. Thus, the concentration of sulphuric acid (H2SO4) is also directly proportional to the rate of reaction, whereby, as the concentration decreases, the rate of reaction also decreases. Since the Magnesium ribbon is in excess, only the sulfuric acid can be allowed to change. Having it in excess is to make sure that its concentration does not change. Using the rate of reaction: Rate = k [H2SO4] And applying the rate equation to the chemical equation in the reaction: Mg (s) + H2SO4 (aq) → MgSO4 (aq) + H2 (g) The rate equation is now: Rate = k [Mg] Â º [H2SO4]Â ¹. Since Mg concentration does not change in the reaction, it is the zero order. On the other hand, since H2SO4 is in the first order of reaction, the rate is directly proportional to its concentration, as measured in the experiment by the concentration of the H2 gas collected, the overall order of reaction is: 0+1 = 1. For Run 2, the table below shows its concentration. Table 6: Molarity of the Hydrogen gas (Run2) The table of Concentration and Time for run 2 gives the following graph: Graph7: Concentration vs. Time (Run 2) The Concentration –Time Graph for run 2 above shows the same trend as in run 1, where it shows an inverse proportionality: as time increases, the concentration of the sulfuric acid ( H2SO4) decreases as measured by the concentration of the hydrogen gas (H2) collected. The rate of re

Database management Essay -- essays research papers

Introduction:   Ã‚  Ã‚  Ã‚  Ã‚  The purpose of the case study is to examine the concepts and ideas that Anthony Ng used to somewhat develop a digital database system. â€Å"The Hong Kong architectural industry had derived enormous gains from the unparallel economic success in real estate and stock market speculation†(CABC, 2000).This new economic surge caused much stress to come in contact with the architectural profession This stress was to produce quantity instead of quality designs. This was to meet demands of the rapidly growing society, causing building to be built by the masses. This is not the way â€Å"Anthony Ng Architects Ltd† wanted to run their business, it was not the way the corporation did business.   Ã‚  Ã‚  Ã‚  Ã‚  Anthony Ng, was the managing director for â€Å"Anthony Ng Architects Ltd†. His goal for the company as managing director was to develop a highly advanced EDMS, a paperless office. This paperless office would allow the architects to spend more time on designing, and less on paperwork. His plan was to have â€Å"in place an Intranet and a web-based document management system when they moved into the new office†(CABC, 2000). Anthony main goal or primary objective was that this new paperless office will increase his corporation get back to creating quality designs as well as a quality of them. The new paperless office will allow for better communication both outside as well as inside the corporation. Also would allow for the architects to focus on designing instead of paperwork.   Ã‚  Ã‚  Ã‚  Ã‚   A) Change in Communication Patterns:   Ã‚  Ã‚  Ã‚  Ã‚  While Anthony was aware of some of the potential setbacks that are going to show up in the process of changing the style of communication, I feel that he did not cover all the essentials. A very important issue that Anthony may have overlook, called dismemberment. â€Å"Dismemberment can be described as the challenge of technological incompatibility†(Sutton, 1996). This can happen frequently in large corporations such as Anthony Ng Architects Limited, when there are many different departments or divisions communicating together. What happens is that each division needs to make sure that they are all using to same programs to communicate.   Ã‚  Ã‚  Ã‚  Ã‚     Ã‚  Ã‚  Ã‚  Ã‚  If would have been good for Anthony to make sure that the EDMS ... ...sp;  Ã‚  All data recovery covers is back ups to all the documents that a stored in the system. Backups are critical to protect valuable data. All thought the expertise is needed, to be sure that important data is safely backed up. This is goes back to the importance of the planning stage to make sure that this area is covered before hand.   Ã‚  Ã‚  Ã‚  Ã‚  The loss of imporatant and valuable data or records can cause huge problems to corporations. Data recovery should be one of the most important aspects of you EDM system. This is what Anthony’s plan was missing for his corporation. For example if Anthony’s plan had gone into effect with no data recovery system, what would have happen if important documents were lost to the design of a new building. This problem would have cause the corporation to question if they made the right decision to switch to an EDM system. Conclusion:   Ã‚  Ã‚  Ã‚  Ã‚  Anthony was correct in understanding that his Architectural firm need to move to and EDM system. For a business to be competitive in today growing economical market, it is important to focus more on the product then the documents relating to the business.

Career Plan Building Activity: Reasoning Aptitude

Completing the Career Plan Reasoning Aptitude Survey my profile shows that I could work well in careers where success comes from applying practical skills and where thinking is used mostly to solve practical problems. It also states that I am likely to be attracted to very practical jobs and careers. There are two tabs, Strengths and Opportunities for the results of the Reasoning Aptitude Survey. The first tab Strengths has five bars and out of five bars I received three for each of the six categories. The six category results show I focus on customer needs and satisfaction, sets high standards for both quality and quantity, works in an orderly way, and achieves project goals. I show an interest in new experiences, I am punctual, follows instruction, safety instructions and requirements of their role, adapts to changing circumstances, and I adapt interpersonal style to suit different people or situations. The next tab is opportunities and there are also 5 bars for score and six categories, on opportunities I received one bar out five and I am unable to get the results to these categories. My thinking style can help influence my approach to arguments by being more in tune with the different ways people understand and learn things and how I approach these methods of understanding. Consider how to best respond to others whether it is information for a meeting or another co worker and evaluate how each person will receive the information. By learning how to approach others and understand how each person learns will allow me to be able to communicate persuasively with others and build a rapport with others.

Chris Cunningham as a Director essays

Chris Cunningham as a Director essays Movies are a dream, and probably a picture of the images in the mind that are formed of a person and this is the person who is guiding the entire movie. Normally this individual is the leader of the pack making the movie, and he is the director. In the past, this was not the scene and the movies were being made by studios, which had set formulae for making movies and through the movies, money. That was money making venture, but it did not have many dreams woven into them. This still exists in certain types of movies in certain countries, but the cheapest method of making movies is now on the video, and this has led to enormous dynamism in the production of these movies. They were also not so original a few years back and did not get into diversions regarding ART or similar outlandish' ventures. (The Duke on The Work of Chris Cunningham') At that time there would be just a few songs playing and this would be the main music element in the music video. This music would have a visual accompaniment from persons like Madonna or Thin Lizzy, or any other popular artiste. This was felt to be enough as a visual, and the concerned viewers would be happy. There would not be demands from the audience about unusual pictures like a sex action between robots or kids chasing pensioners around the housing area. Today, the dialogue of these video movies has changed and they usually start with a lot of motherfucker' and ho' filled words that would not have even appeared in print earlier. Along with that there are a lot of effects like SFX, CGI, malarkey and other effects. All this is added to make the nonsense that is coming out of the video movie interesting' to the viewers. Other interesting bits are added through robots engaging in sex and SFX. One of the greatest in this field was Chris Cunningham. (The Duke on The Work of Chris...

The Reasons Why Firms Want to Use Earning Management Essay Example

The Reasons Why Firms Want to Use Earning Management Essay Example The Reasons Why Firms Want to Use Earning Management Essay The Reasons Why Firms Want to Use Earning Management Essay Good afternoon everyone, today we are going to continue to talk about the consequence of Earning Management, I am xxx We will present the bad side of earning management through 2 cases, The first one is Enron: what happened and what we can learn from it and the second one is the ethical dilemma at Northlake. Both cases are present how management is motived to manipulate accounting numbers to achieve their specific purpose, for example in the first case, Enron increased their net income through many methods to rise their share price, but in the second case, the company decreased their net income. However, both earning management comes with the bad consequences happened to the society. Next, we are going to see another example which is how management is motived to manipulate accounting number to reduce or underprovide for environment and restoration costs. As a result, there cause some ethical issue. First let us go through the Background information: (A. F. P. Company). It is in the Pulp and Paper industry. The company had three major mills, located in some of the more remote location in the province. From A. F. P. Company’s standpoint, of course they do not want to expend too much money on the discharge of waste water from pulp and paper mills; furthermore, the firm had been facing difficult financial times due to recession, and this had caused substantial hardship in the three small communities where the mills were located. But, as in the Pulp and Paper industry has the responsibility to the new government proposals to put effluent controls on the discharge of waste water from Paper mills in environmentally sensitive regions of the province. Therefore, the managers in the (A. F. P. Company) find a way to give themselves a reasonable reason not to install the cleaning equipment. CEO and V. P. of A. F. P. collude together to use earning management to increase their cost on the financial analysis. in the financial report, they states that â€Å"we will have severe financial problems if we are forced into building a lagoon for waste water treatment†, in order to show their fake severe financial problem going to happen, they highly estimate their operating cost would rise 30%, but in fact their cost only can be rise around 8%-10%). And they also highly estimated all other costs. In addition, they don’t take into account the damage to the local river at all. The people live in the downstream are still drinking the garbage or damaged water In this case, let us put all the legal issues behind, and focus on the ethical issue first. As the case mentioned the down totally dependent on the mill for economic survival. It is kind of like Blackberry in Waterloo. As the mills goes, so goes the town. And will thousands of people lost their jobs, if put you in the position to decide between the economic survival or environment damage, how will you decide? If you in the position of A. P. F’s accountant how do you decide between your personal benefits and code of professional code? Let’s say, if you do not use earning management to increase the cost, you will force to lose your job by the CEO.

What Caused the Defeat of the essays

What Caused the Defeat of the essays When looking at the Battle of the Little Big Horn there are many reasons why General Custer lost the battle. Many will say that he made bad choices and others will say that his luck just happened to run out that day. I think the reason why Custer lost the battle was a combination of both but it was his choices in the end that cost him his life and the battle. The events that went on around him that are considered his bad luck could have been looked at when they happened and fixed. There was a lot going on around Custer that could have made his mind not focused at the time of the battle such as running for president and also his ego along with overconfidence. From what Steven Ambrose put forth in his opinion of the battle I agree with most of the mistakes that he says Custer made. The first one and I think second most important mistake that Custer made was not taking the 2nd Cavalry when it was offered to him. This would have given him around a 1,100 men and that would have definitely been enough to defeat the Sioux. This can be countered by that Custer had too much pride with the 7th Cavalry and that he didnt want to share it with anyone else. Custer also knew that he was going to face the largest amount of warriors ever so having more men wouldnt hurt him at all and of course increase his chances of winning the battle. The next mistake that Custer made was underestimating the enemy that he was about to face. He figured that there would be about 1,500 warriors at max where there were actually almost double that. Custer probably didnt think that there would be any Cheyenne either. It was also known that at around that time of year the entire Sioux nation comes together for a big get together. This all stems back to others in the army not doing good reconnaissance of the area where they believed the Sioux were. The area that the army believed to be around at first stretched for 125 miles and was about 50 miles...

The newly hired pharmacist Case Study Example | Topics and Well Written Essays - 500 words

The newly hired pharmacist - Case Study Example The Relevant Issues For decades some pharmacists have chosen to use moral convictions steeped in Judeo-Christian ethic as a right in their dispensing of medications (Wernow &Grant, 2008). Some states in the USA give legitimacy to this stand of these pharmacists. Yet only six percent of pharmacists are likely to adopt such a stand and that too from their religious beliefs (Davidson et al, 2010). Even so this right of the pharmacists runs counter to the principles of autonomy, non-maleficence, and beneficence in patient rights for the dispensing of legitimately required drugs. It is this opposing stances combined with the lack of uniform laws across the USA that has led to a controversy over the use of â€Å"conscience clause† laws by the pharmacists (Weisberg & Fraser, 2009). The Legal Position There are no current laws on whether a pharmacist should dispense emergency contraceptives, or may refuse to do so. In the absence of such laws existing state laws are applicable to whet her a pharmacist may refuse to dispense emergency contraceptives. Not all states have enacted such laws. The states of Alabama, New Hampshire, and Vermont have chosen to remain silent on the issue.