Hydrogen Peroxide and iodine ions Essay Example for Free

Hydrogen Peroxide and iodine ions Essay The reason for the blue-black complex is due to the formation of polyiodide chains during the reaction between starch and iodine. The amylose in starch forms helices with which the iodine molecules align, causing a transfer of charge. This charge transfer corresponds to the absorption spectrum, in which the blue-black colour is the complementary colour. The details of this reaction are not fully known yet. The strength and deepness of the colour is dependent on the amount of amylose present. 3The rate of the reaction can be explained by the collision theory, which shows that the rate can be altered by4: concentrations, pressure, temperature, intensity of radiation, particle size, surface area and a catalyst. In this experiment I will be looking at concentrations, temperatures and the affect of a catalyst. The collision theory also states a reaction will only take place if threeconditions are met: 1. Reactant particles collide with each other The reactant particles must collide with the correct orientation. 3. The collision must provide enough energy to overcome the activation energy. 2This is due to the fact, if particles collide but are not orientated correctly the molecules will just bounce of each other, this is often due to charge of the molecules which causes repulsion if the orientation is incorrect. If particles collide with the correct orientation, they must collide with a minimum energy otherwise they will just bounce of each other. The activation energy is used to break some of the original bonds, which is essential for a reaction to occur. The activation energy is this minimum energy and can be shown on an energy profile. We can see from the below graphs how in an endothermic reaction the energy of the reactants is lower than the energy of the products, this is why it absorbs heat. Whereas an exothermic reaction will give out heat as the reactants have a higher energy than the products. 2The activation energy can be marked on the Maxwell-Boltzmann distribution curve. The Maxwell-Boltzmann distribution refers directly to gases, however the principles can be taken and applied to liquid reactions also. 5The area underneath the curve represents the different particles and their level of energy. Only the particles that have energy higher than the activation energy will undergo a reaction. We can see that the kinetic energy of a molecule can never be zero, but theoretically can be ever increasing, as there is no defined maximum energy value. You can then change the shape of the curve or move the activation energy in order to increase the number of collisions that overcome the activation enthalpy. Changing certain variables can do this, which is what will be done in this experiment. 6 7 The first variable I will be varying is concentration of the different reactants; I will be using 5 different concentrations for each reactant. Increasing the concentration of a reactant means that there are a higher proportion of particles per unit volume. This then causes the rate of reaction to increase because particles have a higher chance of colliding  with sufficient kinetic energy to cause a reaction. 8By varying the concentration of each reactant it allows me to calculate the order of the reaction, by investigating their effects. By finding the order I can then calculate the rate constant and rate equation. As shown above the majority if the percentage errors are minimal, however we can see the largest error was that of the colourimeter which came to 7.14%. Unfortunately there is little that can be done to prevent this, as the reading is so small. I ensured the same colourimeter was used each time, to eliminate as much error as possible. In replacement of the thermometer, a digital thermometer could be used to gain a more accurate reading of the temperature, as the precision error for it is  ±0.05 °C. Other than this the equipment used was well chosen as it gave the smallest amount of error possible. The investigation was accurate as most of the percentage errors are very low and mostly insignificant. Other errors are likely to be that the room temperature varied between 19 and 23 degrees C, throughout the experiment on a day-to-day basis, a factor out of my control, therefore this would have affected the rate constant. To reduce this error and improve the experiment, each experiment could be done in a thermostatically controlled water bath. After looking at the published data of the activation enthalpy for a non catalysed, I can see my experiment is reliable as the value I got was only 5.794 KJ mol-1 off the actual activation enthalpy, however in order  to be able to fully justify my findings I would need to repeat each experiment numerous times, a minimum of three, to then allow me to calculate an average and to disregard any anomalous data. As each experiment was only conducted once, it could be that all the data is anomalous. By using two different methods at looking at how concentration affects the rate of reaction, my results are more reliable as both methods back each other up. To improve this aspect of the investigation I would use more and a wider variety of concentrations of each reactant, during the colourimetery, as only two concentrations of each were used. The main reason for this was the time allocated to this aspect of the investigation, as each run of colourimetery took around 25 minutes. To improve and investigate further into this experiment I would create a calibrate curve through the colourimeter by making up solutions of the coloured substance of known concentration, then measuring the absorbance of each, ensuring to use the same conditions as the experiment will be done as. The graph of absorbance against concentration will give your calibration curve. This would then allow me to see how much iodine was produced at each stage of the reaction. Allowing me to closely monitor the rate of reaction. A limitation of my experiment would be the catalysed experiment; due to the fact the reaction occurred so rapidly. The human reaction time is only accurate to 0.5 seconds, and in some cases the reaction took only 3 seconds, meaning the percentage error is 16.7%. To look into this particular catalyst further, I would dissolve the catalyst and dilute it to lower the concentration; this may give a longer time period before the blue-black complex forms. You would also be able to investigate if the concentration of catalyst changed the rate of reaction. Another potential way to improve this would be to investigate how different catalysts may affect the reaction and to what extent do they lower the activation enthalpy. A catalyst that could be tried would be ammonium iron sulphate, using the iron (III) ions to catalyse the reaction. Another limitation of the experiment that would have reduced the accuracy would be the fact the blue-black complex forms gradually, therefore it subject able as to when to stop the stopwatch. In order to reduce this error a black cross was marked and the experiment was stopped once the black cross could no loner be seen. However whilst conducting the temperature experiments the reaction was done in test tubes and no cross could be used, to minimise the error the stop clock was stopped immediately at the first sign of the blue-black complex. The final main limitation would be that the conical flask was swirled in order to mix the two solutions. Although best efforts were made to ensure the solutions were swirled evenly in each experiment, it is difficult to control. An improvement would be to use a magnetic stirrer, set at the same speed to ensure the same kinetic energy throughout the solutions, ensuring this did not affect the reaction. As found in the Nuffield Book of Data, I can see that the order of the reaction with respect to H+ ions is dependent on the concentration. To further my investigation it would be interesting to look further into how the concentration of sulphuric acid may cause the order to be either 1 or 0 with respect to the H+ ions. I could then look at the point at which it changed from being zero order to first order. It would then be interesting to see how this affected the activation enthalpy of the experiment. I can conclude my results are accurate and reliable, due to the fact the equipment was chosen with low precision errors and any errors given were too small to have a large impact. This can be backed up by the published data found in the Nuffield Book of Data.

Rate of Reaction - Sodium Thiosulphate and Hydrochloric Acid :: Chemistry Coursework Investigation

Rate of Reaction - Sodium Thiosulphate and Hydrochloric Acid Aim Investigation, to find out how the rate of reaction between Sodium Thiosulphate and Hydrochloric acid is affected by changing the concentration. Introduction I must produce a piece of coursework investigating the rate of reaction, and the effect different changes have on them. The rate of reaction is the rate of loss of a reactant or the rate of development of a product during a chemical reaction. It is measured by dividing 1 by the time taken for the reaction to take place. There is five factors which affect the rate of a reaction, according to the collision theory of reacting particles: temperature, concentration (of solution), pressure (in gases), surface area (of solid reactants), and catalysts. I have chosen to investigate the effect of concentration on the rate reaction. This is because it is the most practical to investigate. Dealing with temperatures is a difficult task especially when we have to keep constant high temperatures. Secondly the rate equation and the constant k changes when the temperature of the reaction changes. We have no gases and solids involved therefore it is easy to deal with solutions. Similarly the use of a catalyst complicates things, and if used incorrectly could alter the outcome of the experiment. The theory behind this experiment is that 'Increasing the concentration can increase the rate of the reaction by increasing the rate of molecular collisions.' GRAPH I will place the reaction mixture on a paper with a black cross-drawn on it. When the cross is completely obscured, the reaction will have finished. The time taken for this to happen is the measure of the rate of reaction. We must do this several times, and change the concentration of Sodium Thiosulphate. The rate of reaction is a measure of the change, which happens during a reaction in a single unit of time. The things that affect the rate of reaction are as follows:  · Surface area of the reactants  · Concentration of the reactants  · The temperature at which the reaction is carried out  · Use of a catalyst Reaction equation is mentioned above but rate equation could only be decided by doing experiments. So the following procedure can be used to carry out the experiment. Plan Equipment  · 2 Measuring cylinders  · Beaker  · Stopwatch  · Paper with black cross on it  · Sodium Thiosulphate (different concentrations)  · Hydrochloric acid (same concentration each time)  · Water (different concentrations)  · Pipette Prediction I predict that the greater the concentration of Sodium Thiosulphate

Each Man Kills the Thing He Loves Essay

â€Å"It seems to me that we all look at Nature too much, and live with her too little† This quote provides a philosophical insight into the main theme I will explore within my chosen poems. Nature is defined as the phenomena of the physical world collectively, including plants, animals, the landscape, and other features and products of the earth, as opposed to humans or human creations. However this simply states that nature and humans are opposites, and one opposes the other. The poems I have chosen question this definition of nature and put it to humankind to answer the question, are we one with nature, or merely manipulating it to our own advantage, giving little back to our heritage? Oscar Wilde’s ‘The Ballad of Reading Gaol’ explores our own humanity and how easily two conflicting emotions become each other; whilst Charlotte Mew’s ‘The Trees Are Down’ examines human ignorance and through use of language she unravels the ever changing connections with nature. However it is Lawrence’s ‘The Snake’ that uses strong imagery to portray humankind in all its shapes and forms, forever changing. These three poems utilize a series of techniques that bring forth a common phrase we are what we hate, kill and love, which ultimately contributes to a universal relevance, the main idea I will be focusing on, ‘each man kills the thing he loves’. Oscar Wilde is considered a gifted author, playwright and poet of the nineteenth century. He was intimately involved in the up rise of aestheticism, a philosophy of nature and expression of beauty; Wilde expanded the narrow-mindedness of the Victorian Era, ultimately bringing a new light to society. ‘The Picture of Dorian Gray’, a semi autobiography, is considered the most seminal and serious of all Wilde’s works. However it is after being accused of homosexual offences, by his lover’s father, and further incarcerated at Reading Gaol that Wilde’s writing took a more melancholic approach. After serving his two years of hard labour, Wilde then moved to France, and was in ‘penniless exile’ It was in his last remaining years that Wilde produced two extremely heart felt pieces of work; De Profundis, a Latin term for ‘from the depths’, was an epistle addressed to his lover, Lord Alfred Douglas, and recounted his lifestyle of extravagance and love, within the first half. In the second part the text looks into his recent experiences, during his time at Reading Gaol, as he comes to terms with his spirituality. The other, ‘The Ballad of Reading Gaol’, a six ‘cantos’ poem, further subdivided into six lined stanzas, describes his experiences of loneliness and death, whilst incarcerated at Reading Gaol. The initial scene of the ballad, ‘He walked amongst the Trial Men, In a suit of shabby grey’, was inspired by the hanging of Charles Thomas Wooldridge, on Saturday 7th July 1896, a thirty year-old man convicted of cutting the throat of his wife. Charlotte Mew was an understated poet, whose works were less recognised, in comparison to Wilde, however she was highly praised by the likes of Siegfried Sassoon and Virginia Woolf. Mew lived a traumatic life, from beginning to end; facing close family deaths and two of her siblings being diagnosed with mental illness. These early experiences affected her future and had major influences on her; beginning with her and her sister Anne making a pact never to marry, in fear of passing on her family’s madness. Additionally Mew had similar sexual orientations as Wilde, attracted to ones own sex, however due to the condemnation of homosexuality, in the nineteenth century, Mew was left with a strong sense of suppression. Her life was extremely stifled by such experiences of death, loneliness and disillusionment and hence reflects these themes within her work. ‘The Trees are Down’ is a six stanza poem, that follows no structured form, merely ranging from one to nine lines, each stanza. The poem is based around the Revelation reference, at the beginning of poem: ‘-and he cries with a loud voice: hurt not the earth, neither the sea, nor the trees† and relates this to our society, past, present and future. David Herbert Lawrence, D. H.  Lawrence, was an extremely successful writer and artist. Publishing many plays, novels and volumes of poetry. He lived a very modest life, born in the small mining township of Eastwood, England, in 1885. Lawrence was an outcast, with few friends at school, who didn’t follow in his father’s footsteps of becoming a miner. So Lawrence went on to study, gaining a scholarship at Nottingham High School and then becoming an elementary teacher. However it was after falling in love with his old professor, Earnest Weekely’s, wife, Frieda von Richthofen, that his life was altered. Breaking off his engagement and ending his teaching career, Lawrence developed his writing into a career. ‘Sons and Lovers’ is a semi-autobiographical account of Lawrence’s experiences as a boy, under the name of Paul Morel, who loved his mother and full of hatred for his father. Lawrence wrote this novel after the death of his mother, in 1910, and explores the love of a mother â€Å"As her sons grow up she selects them as lovers–first the eldest, then the second. These sons are urged into life by their reciprocal love of their mother–urged on and on. † All three poets lived extremely different lifestyles, however the common thread between them is the literary period they lived in, the nineteenth century. Wilde’s work, pre-incarceration, was considered extremely lush and light, however post-incarceration it grew sad and he adapted Dark Romanticism into his works. Mew explored Naturalism where the environment controls people, especially in ‘The Trees are Down’, which is similar to the works of Lawrence who combines naturalism with Pre-Raphaelitism, combining literacy with the visual arts, which is seen through his strong imagery. Comparing these three literary movements helps shape each poem, providing a purpose behind the theme of each text. The intent of these poems differ slightly from one another, however all three have embedded the allegory of killing our intimates within their texts. Wilde takes his own personal experiences of loss, and additionally the example of Wooldridge’s own act, to reveal how within love echoes hate and vice versa. Mew, who’s poem seems completely ahead of her time, exposes the ignorance of the human race. This exposure of human’s prejudice towards nature is again echoed within Lawrence’s poem through the line ‘my education said†¦ he must be killed’. The common purpose within these texts is the exposure of human’s ignorance and how inevitable it is. Lord Alfred Douglas’s father took Wilde to court for alleged homosexuality and this life altering moment in Wilde’s life is easily identified within the poem ‘The Ballad of Reading Gaol’. However Wilde carefully entwines Wooldridge’s own attempt of ‘killing the thing he loved’ within his own story to expose the wider occurrence of this tragedy. It is questioned whether or not Wilde came up with this statement or whether it is a nod to Shakespeare’s Merchant of Venice when Bassanio asks ‘Do all men kill the things they do not love? ’ Wilde is well known for his stimulating epigrams, yet this phrase seems to generate a metaphor for life and although not a question, like in Merchant of Venice, Wilde questions the similarities of love and hatred. When searching the word ‘love’ up on Thesaurus. com it provides a list of antonyms, including ‘hatred’, and vice-versa and yet here we see Wilde placing the two, opposing verbs, hand in hand. Wilde’s underlying purpose within ‘The Ballad of Reading Gaol’ is not to recount his experiences at Reading, but what Wilde is really looking for is the mode of interaction in which love and hatred are one and indivisible, in which the bitterness is an expression of the admiration. Written in the nineteenth century Mew’s poem, ‘The Trees are Down’, was completely ahead of its time and in today’s society is seen as an empowering demonstration of humanity’s destructive ignorance. Using the line from the revelation Mew makes deep connections with the past and by examining her present looks into the future of what is to come, what is now extremely relevant. The purpose of this is to reveal society’s destructive nature and speak out against the destruction of our heritage as ‘half my life it has beat with’. Lawrence examines prejudices of the human race towards animals, within the poem, ‘The Snake’, and how we accept the words fed to us in an alleged ‘education’. However the irony of it all is that we are one with the Snake and this is what Lawrence was trying to achieve. Describing the snake drinking from trough as if ‘he’ is a person, the same as the narrator, then ‘he’ looks up ‘just like cattle do’. Lawrence’s connections across the animal kingdom; man, snake and cattle alike, break down the barriers of humans vs. animals, generating a scene of equality. However it is once the narrator’s ‘voice of†¦ education’ convinces him otherwise, his face becomes humanity; fearful and paranoid. Each text focuses on humanity and from here branches off the love-hate, ignorance and prejudices of the human race. Wilde highlights the correlations between love and hatred we express towards one another, Mew exemplifies humanity losing touch with their heritage, whilst Lawrence’s reveals the irony within humankind’s prejudices. In all three cases the writer is attempting to exemplify how two effects, wildly different, grow closer together, reciprocating off one another, or how two objects, scientifically/emotionally tied together can push one another away.

Agile Solutions Improving Financial Integrity Essay

Agile Solutions: Improving Financial Integrity In many large corporations managing waterfall projects, the first hurdle is typically passing a capital rationing process. This often amounts to project justification through a business case, comparison of ROI, or other such metrics, against those of other projects competing for the same capital allocations. The process usually culminates with allocation of funds to complete the chosen strategic projects. There are many shortcomings of this method and the unacknowledged compromises made during this process are many. In order to get an initial budgetary allocation, rough estimates must be made as to the cost and timeline of the project - quite often without gathering complete (or any) requirements for the project. While this may be useful for making rough comparisons with other projects competing for funds, it isn t historically as accurate as it should be. Accordingly, with the requirements neither clearly nor accurately defined at this stage, these estimates are highly prone to error. After the project is funded, earnest requirements gathering and assessment begins, and project manager(s) begin to determine the best path to finish the project in the promised time frame without going over budget. 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