Stoichiometry Lab

Stoichiometry February 28th, 2013 Abstract The reactions of the Sodium Hydroxide and ii acids, Hydrochloric sultry and sulfuric Acid were per make. The heat given off by these two reactions was used to en authentic the stoichiometric ratio and the restrict reactants in each experiment. Introduction Coefficients in a balanced equations envision how many moles of each reactant is needed to react with each other and how many moles of each product that ordain be formed. Stoichiometry allows us to calculate the amount of reactants needed and also the amount of product.The major basis of stoichiometry is formed by the law of definite proportions, which states that a chemical compound always contains the exact proportion of elements by mass. This is also the heart of balancing chemical equations. The coefficients of a balanced equation can also be thought of as the ratios in which the reactants combine. In the chemical equation A+ B AB the coefficients tell us that for every one mole of reactant A one moles of reactant B are needed and used to put forward the product AB.If two moles of A was present and only one mole of B the otiose mole of A would have nothing to react with. In this reaction B would be the limiting reactant. The reaction is limited due to B because once B is all used up, the reaction forget stop, and there would be an excess of unused A. The progress of a reaction can be measured by the heat energy that is given off. Exothermic reactions give off heat and accordingly an increase in temperature also occurs. The reaction amidst an acid and a base is also know as neutralization, and is usually an exothermic reaction.When reactants are combined at stoichiometric ratios the reaction is able to be completed and would exert the most heat energy. The purpose of this lab was to carry out the reaction between a basic solution of Sodium Hydroxide with Hydrochloric acid, and also the reaction of Sodium Hydroxide with Sulfuric Acid to determine the li miting reactant and the stoichiometric ratio of each experiment. Procedure Reaction Between HCL and NaOH thin Solutions of HCL and NaOH were prepared. 120 ml of 3M stock of HCl and NaOH were measured with a graduated cylinder and placed into two 250 ml beakers.Two 400ml beakers were filled with 240 ml of water measured by graduated cylinder. The 120ml of HCl was added to one of the beakers containing water and the 120 NaOH to the other, two being added slowly while stirring the solution vigourously. Label the beakers HCl and NaOH. Keep the beakers covered with a discipline glass when not in use. Measure and record the temperature of the NaOH solution using the PASCO Explorer temperature probe. Make sure to rinse off and dry the probe after every use. Obtain a coffee cup calorimeter and lid to house the reactions.Measure the appropriate amount HCl (see graph A) pour it in the calorimeter and determine its temperature using the temperature probe. leger the temperature. Measure t he corresponding amount of NaOH (see chart A) and add it to the calorimeter all at once. Put the lid behind on the calorimeter and stir it carefully with the probe. Record the highest temperature reached as the reaction occurs. Rinse the cup with deionized water and dry. adopt experiment for each of the amounts of chart A. chart A) Amount of each reactant l 1. 0 M Acid 55. 0 50. 0 45. 0 40. 0 35. 0 30. 0 25. 0 20. 0 15. 0 10. 0 5. 0 ml 1. 0 M NaOH 5. 0 10. 0 15. 0 20. 0 25. 0 30. 0 35. 0 40. 0 45. 0 50. 0 55. 0 * habituate 100 ml graduated cylinder for measuring volumes 30 to 55 ml, 25 ml graduated cylinder for volumes 15ml through 25 ml, and 10 ml graduated cylinder for volumes 5ml and 10 ml Reaction Between H? SO? and NaOH Use the procedure from the Reaction Between HCL and NaOH only substitute the HCl with H? SO? , and the same amounts listed in chart A.

The Nature of Organisational Change (Mod 5 Case Leadership and Change) Essay

The Nature of Organisational Change (Mod 5 parapraxis Leadership and Change) - Essay ExampleThese include shargonholders, customers, suppliers, employees, societal groups as well as communities which are come to with the legal and natural environment in which the business operates. The stakeholders have keen interest in the moves of the governing body as they are positively and minusly affected by them.Stakeholders such as investors have drift their money into the business and therefore, it is their right to stay informed on how the company is progressing and of course up to figure knowledge of dividend/profit generation. Any decision that lowers the profit yield would never get appreciation from shareholders. Employees are the ones who work devotedly for the company to make a living they have the right to know in what direction the company is going because they are concerned about(predicate) securing their future. Before actually introducing change into the organization, the assignment and approval of all employees is essential so that they could work with motivation and commitment and demonstrate no negative productivity. In the kindred manner, the customers, who are the end users of the companys products and services, must be educated about the strategic decisions of the organization. The reputation of any business lies in the hand of its customers. If any business is unable to rescue the promised value to its customers, it will lose its credibility and loyalty which would ultimately affect the financial performance.Suppliers are integral to the success of any business. Suppliers need to stay informed about the companys activities so that they could venture the demand for raw material as well as promptness in payments. In the same way, environmental groups are concerned about ensuring that the businesses are operating in an environmentally friendly manner. If the environmental rules are being violated by any business, strict actions are taken whi ch can corrupt the brand image.Every decision that the CEO of an organization makes

Trifles Dead Bird Essay Example | Topics and Well Written Essays - 500 words

Trifles Dead Bird - Essay ExampleMrs. Peters points to a broken jar that the author refers to as conserves. From this, the sheriff wonders how a adult female can worry about her preserves while she is facing murder charges. The sheriff, from this distinguishment implies that there are certain things that only a adult female needs to worry about. The preserves symbolize anything that women worry about more than men. At some point, the women overly commented on the tidiness of the house. Well, men in the society from this play do not pay wariness to such things and are always complaining of a messy house (Glaspell, 202). Mrs. Wrights husband seemed to exasperate her. The mistakes her husband made, trifles were considered among the reasons for her wanting to kill her husband.On another instance, the author expresses her belief that on marriage, a woman loses her identity, and becomes what her husband is. This is seen in the play when the County attorney says that a sheriffs wife is married to the law. The sheriffs wife is Mrs. Peters. Mrs. Wright is described as jovial and one who loves to wear colorful clothing. However, on marriage she becomes the opposite. The untidy state of her house is reflected to her husband. In the play, the ladies excessively share a belief with the men that they are of little importance.It is also observed from the play that women did not share trivial issues with the men. The men did not see value in whatever opinions they held. The women thought that if they shared their thoughts with the men they would be laughed at. They also considered their opinions as trifles. On the search for evidence, the women discussed kid issues that would collect up to substantial evidence. The men, however, were looking for a major piece of evidence since they considered the minor pieces as trifles. The women even had doubts that the trifles would solve the crime due to the little value put on them by the men.The item that Mrs.

Soil bioremedation - potential role for genetic engineering Literature review

Soil bioremedation - potential role for genetic engineering - belles-lettres review ExampleFor instance, a recent report by Wu and Yu (2011) indicated that the issue of environsal pollution in China has reached an alarming extent. Specifically, the article reported that as of 2011, one-sixth of Chinas agricultural primer has been contaminated with mercury, cadmium, copper, and other heavy metals (Wu and Yu, 2011). According to the Chinese Academy of Agricultural Engineering, this fraction of land is analogous to approximately 20 million hect bes, with the industrialized regions being more critically affected (Wu and Yu, 2011). Heavy metal-contaminated campaign have been shown to greatly affect the floral, faunal, and microbial communities (Lukkari et al., 2004 Agoramoorthy et al., 2006 Chen et al., 2007). In a study conducted by McGrath et al. (2001), it was open up that exposure to toxic metals significantly reduced microbial diversity and other biologically-mediated soil acti vities. This alteration in the microbial composition, according to Elsgaard et al. (2001) may negatively affect recycling of plant nutrients, regulation of plant swearword and plant growth, and maintenance of soil structure. Also, pollutants from the soil could accumulate in plants and can then be transferred to high trophic levels in the food chain, posing health hazards to humans (Notten et al., 2005). Furthermore, the effects of soil pollution are not only confined to the terrestrial compartment of the ecosystem. It can also influence the integrity and dynamics of aquatic and marine systems (Cardellicchio et al., 2006 Vorosmarty et al., 2010). By virtue of geoweathering processes, hydrocarbons, organophosphates, and metal contaminants deposited in the ground could leach down the water parry and redistribute in surrounding streams, lakes, and other bodies of water (Chen et al., 2007). Given the tremendous threats soil pollution poses to the environment and to human population, the need to control soil contamination or neutralize its toxic effects and the instauration of rehabilitation in areas previously affected by this problem is indeed necessary. Bioremediation, a technology that makes custom of living organisms to treat polluted areas, is one of the most commonly used strategies to rehabilitate contaminated soils (Nasu and Iwamoto, 2001 Obbard et al., 2005 Umrania, 2006 Luo et al., 2010). Technically, bioremediation focuses on enhancing the natural biodegradation process at a rate that significantly increases the removal of contaminants (Calvo et al., 2009). One commonly diligent bioremediation strategy is to supply the polluted environment with nutrients like nitrogen to hasten the process of degradation (Nasu and Iwamoto, 2001 Calvo et al., 2009). another(prenominal) popular method is to directly introduce organisms with desired capabilities to the contaminated areas in the hope of speeding up biodegradation (Nasu and Iwamoto, 2001). Hence, by ex ploiting the biological processes inherent to plants or bacteria, the clean-up of environmental pollutants like hydrocarbons, lead, cadmium, and the like could be made possible (Obbard et al., 2011 Luo et al., 2010). However, the development of enhanced capabilities for degradation or accumulation of organic and heavy metal contaminants

Habits of Highly Effective People Essay Example | Topics and Well Written Essays - 500 words

Habits of Highly Effective People - Essay Example coveys ideas flush toilet be applied to this field because they be very simple and practical guidelines which can easily be applied when tuned to specific organisational work culture. Organisations have their staff which they manage to ensure their return is maximized this is d mavin by inculcating Coveys concepts among the employees. This helps in their personal and professional development (Kerzner, 2001). The following are the three of his seven habits that can be applied to project wayBegin with the end in mind this is the most important habit since it sets the overall goals that one wants to attain in any venture. When one sets out to start a project, the long term goal is set at the conceptualization stage. aspect a vision for any proposed project or business venture shows clarity of purpose and is endlessly enshrined in smart set constitution. When a company sets out to introduce a product in the market, a thorough marke t analysis is conducted to check if it is indeed feasible. Customer feelings and needs form part of company vision as they are the ones that ensure its success by purchasing its products (Ross, 1995).Project management provides the timelines for slaying tasks and ensure schedules are followed to the latter. A company notes the requirements it needs to start a project, it thence notes the available resources at this concept and development stage. After this is done, then it will be easy to follow through the blueprint rather than skipping some vital yet ignored stages for instance, setting organizational goals.Put branch things first this entails breaking down the tasks and assigning each component execution time in the order of priority. The management has to sit down and decide which responsibilities require a quick implementation time frame they then schedule their tasks based on this. This

Communications Coursework Example | Topics and Well Written Essays - 1500 words

Communications - Coursework ExampleThe movement of structuralism is closely connected to the study of signs and symbols and how individuals created meanings of these signs and symbols. The movement of structuralism is said to require been originated in the theories of Ferdinand de Saussure during the ahead of time period of the 1900s (Berger, 2006, p.20). Saussure was the unity who developed signs and symbols and believed that all languages constitute of difficult system of symbols and these symbols help in expressing ideas and there ar certain regulations that are governing the way these symbols are used. He asserted that both particular symbol is a matter of chance and a link does not exist amid a word and the meaning attached to it. For example the word dog does not signify an plan of an wolf. Structuralism up to now states that a literary piece of work has zero origin and the individual authoring a piece of literary work simply occupies an already existing language whic h assists him/her in created sentences for his/her story. 2. Culler states that edict is a primary reality, by this statement he is entering into an argument against Ferdinand de Saussure who is of the idea that human being beings are the ones who have created golf club and the society itself was not created first (Berger, 2006, p.14). Basically, Culler is entering into a chicken and egg fight in which the issue is whether chicken created eggs or the eggs created chicken. Culler is arguing that it was not the humans who created the society, and society preceded human beings. Culler states that the society is not an outcome of behaviors conducted by human beings and is not demonstration of the human mind. Culler even stated that if an individual wants to conduct a study on human behavior and wants to analyze human behavior, he/she should first study the society and he even added that meanings are derived when an individual interacts with the society and olibanum they should be e xplained in the context of the society. Culler has raised a significant debate against the assumptions of structuralism, this is because if the society would not have existed human beings would not have learned how to interpret the meaning of a specific sign or object and this is because the meaning of science do not evolve out of nowhere, they are created by the society. The society is very important for the development of communication as due to its existence, humans learn how to speak and preserve and learn meanings of distinguishable signs and symbols. 3. The patterns in which stories and speeches are narrated and told are a huge field of study and one of the greatest theorists who contributed to this study was William Labov during 1972 (Berger, 2006, p.40). According to Labov there are six steps if story telling scratch from abstract in which an overview of the story is provided. For example In a recent speech on animal behavior I att stoped, the speaker started by proving a n overview of what he is going to talk about. Next comes the orientation in which the speaker informed us about which animals he is going to talk about, their behaviors at under different situations and the reasons for exhibiting that behavior. Next is the complicating action in which the speaker informed us about the events in which he willing narrate the entire topic starting off with a background, concentrating on theorists and application of theories and in the end he concludes. Next he provided an evaluation of the events

Lesson 8 discussion & Assignment Example | Topics and Well Written Essays - 500 words

Lesson 8 discussion & - Assignment practice sessionI prefer Jimi Hendrixs version of the Bob Dylan tune All Along the Watchtower. Bob Dylans edition is keeping the folk genre and has incorporated harmonica. Moreover, Dylans version possesses the rawness within his singing, and I enjoy the simple, undistorted instrumentality. Moreover, Bob Dylans tune does not display the similar angst and emotion that the Jimi Hendrix tune hosts. The groove and instrumentation of Hendrixs loom develops a visual of what the tune represents. The guitar leads a stronger sound and beefs up the song. Moreover, Dylans version is a little much ancient, but I cannot quite understand the lyrics. Side by side, I think that each look at raw emotions that appeal to their audience. With Bob Dylans country esque vocals on top of bluegrass ish music, and Jimi Hendrix electrified energy filled sound, both provide very different approaches while achieving their goal. Hendrixs version also involves listener more (prenominal) and possesses more surprise elements in it that is it is full of energy, dynamics, and contrasting sections.Bob Dylans recording of the All Along the Watchtower is approximately the lyrics since Dylan maintains the rhythm section simple with a steady groove on mostly acoustic instruments. He foc utilisations on the words and the message the song send to the listener at the expense of the musicality and instrumentation of it. Moreover, he keeps the melody in a small range when singing and the harmonica in amongst verses adds some variety and response to the vocals. Moreover, Dylan keeps it simple folk sound accompanied by a clear-cut arrangement and simplicity. Conversely, Hendrix takes the song away from the existing folk genre through the introduction of the mechanism that use relatively heavier instrument with louder drums and electric guitar.Jimi Hendrixs version is completely different since he rocks the tune out. Nevertheless, he adds heavy guitar, which is extr emely appealing