Determining the Rate Equation of a Reaction Essay Example for Free

Determining the Rate Equation of a Reaction Essay The aim of this experiment is to determine the rate equation for the reaction between sodium thiosulphate and hydrochloric acid using the order of the reaction with respect to each of the reagents. HCl (aq) + Na2S2O3 (aq) 2NaCl (aq) + SO2 (g) + S (s) When Hydrochloric acid is added to sodium thiosulphate, a solid ppt of sulphur is formed. I will use this to judge when the reaction has ended. The rate equation for this reaction is R = k [HCl]x [Na2S2O3]y In this equation: R = the rate of reaction k = the rate constant x and y = order of reaction with respect to HCl and Na2S2O3 (e. g. 0, 1, 2 etc) [HCl] = the concentration of HCl [Na2S2O3] = the concentration of Na2S2O3 My experiment will enable me to calculate x and y through plotting the volume against the reciprocal of the time it takes for the ppt to form. Preliminary work: The demonstration done by my teacher show that 50 cm3 of thiosulphate and 20 cm3 of deionised water mixed with 5cm3 of hydrochloric acid took 14.93 seconds to form the ppt. I will use this as a guide to decide which set of concentrations I will use to get a reasonable time which I can plot. When I implement my plan, I will plot my results. Using the shape of the graph, I will then deduce the order of the reaction. The following graphs show the shapes I should get for each order of a reaction. I am not changing the volume of hydrochloric acid because I want to test the effect of changing the concentration of the sodium thiosulphate to be able to find out the order of the reaction with respect to the sodium thiosulphate. Apparatus: * White tile with X in the middle. I will place my reacting solution on this white tile and time until the cross can no longer be seen. * Stop watch to time the experiment * Stirring rod * 5 cm3 measuring cylinder to measure the hydrochloric acid * Two 50 cm3 burette to measure the deionised water and the sodium thiosulphate as it is more accurate than a measuring cylinder. * One 250 cm3 conical flask into which I will mix my reagents * Two funnels to full my burettes, which I will remove before looking at the meniscus. * I will be supplied with deionised water, HCl and Na2S2O3 Concentrations: Run 1 Run 2 Run 3 Run 4 Run 5 Na2S2O3 (cm3) 50 45 40 35 30 Deionised Water (cm3) 20 35 30 35 40 Variables: Fixed Independent Dependent Temperature: the experiment will be done at room temperature. I will control the temperature because changing the temperature changes the rate which will affect me results. Concentration of HCl: I will keep this constant because I can only change the concentration of one reagent to see the effect this has on the rate. If I change both reagents I will not be able to tell the order of the reaction is with respect to which reagent. The white tile and cross: changing this might affect my visibility of the cross and the time. Total volume: I will keep this the same to ensure a fair experiment and the same visibility due to smaller volumes being more shallow and I might see the ppt at different times. My independent variable is the volume of the sodium thiosulphate. By altering the volume and adding deionised water, I am changing the concentration. This will enable me to observe how this will affect the rate of the reaction The dependent variable is the time taken for the cross to disappear. Method: 1. fill one of the 50 cm3 burette with sodium thiosulphate and the other with deionised water using the funnel and remove funnel before looking at meniscus. The bottom of the meniscus should be on the zero line. 2. measure into the conical flask the exact amount stated in the table above of the sodium thiosulphate and the water for run 1. 3. measure using the 5 cm3 cylinder 5 cm3 of HCl. 4. place the conical flask on the white tile with the cross 5. add the hydrochloric acid and start the stop clock. 6. stir the mixture briefly. 7. look at the conical flask from the top and stop the stop clock as soon as the cross is no longer visible. 8. write the time taken in the table. 9. repeat steps 1-8 for the other runs. I will then convert the times into rates by doing 1/t. this will go along my y-axis. The volume of the sodium thiosulphate will go along the x-axis. Based on the shape of my graph I will then decide what the order of the reaction is with respect to the sodium thiosulphate. Safety: Chemical Hazards HCl Solutions equal to or stronger than 2 mol dm-3 but weaker than 6.5 mol dm-3 are IRRITANT. Na2S2O3 Sodium thiosulphate may be harmful if you swallow it. It may also irritate the eyes or lungs. Eye contact: Flush the eye with plenty of water. If irritation persists, call for medical help. Skin contact: Wash off with water. If swallowed: If the amount swallowed is not trivial, call for medical help. SO2 Major hazard : Inhalation Odour : Pungent and Irritating S Contact with the eyes can cause irritation. The solid may also irritate the lungs if breathed in. Sulphur burns to give toxic gases, so should not be burnt in the open laboratory. Wear safety glasses. Solid sulphur should pose only minor hazards unless heated to a temperature at which it will burn. Safety glasses required. NaCl May cause eye irritation. Reference: http://www.cartage.org.lb/en/themes/sciences/Chemistry/Miscellenous/Helpfile/Kinetics/Rateorder.htm Chemistry 2 Cambridge Advanced Sciences Endorsed by OCR page 109 http://physchem.ox.ac.uk/~hmc/hsci/chemicals/sodium_thiosulphate.html

U.S. Military Aid - America Must be a Global Policeman Essay -- US Fo

U.S. Military Aid - America Must be a Global Policeman The United States military aid given to Kosovo raises many questions about the foreign affairs policy of the United States of America. Now the U.S. is sending its troops to Timor, a small island off the northern coast of Australia. The U.S. has sent marines to Australia to set up a command post for the troops that the United States will be sending to help with logistics, communications, and intelligence. Many critics believe that the U.S. should not get involved in matters that have no direct impact on the United States. But do not American’s believe that all men are entitled to life, liberty, and the pursuit of happiness? If this is true then it should be the United States duty to help those who are oppressed and suffering. The U.S. needs to be a global policeman to watch out for the humanitarian needs of ethnic groups and peoples and make sure that they are protected against oppression. The U.S. must do what is morally and ethically right, the U.S. is one of the only countri es large enough to give many forms of help and intervene when interests other than that of national security or interest are at steak. Any person who values their human dignity cannot stand by while innocent people are being killed. President Clinton believes that if we have the power to stop genocide and ethnic cleansing then we must make every effort to do so. In an article in The Washington Times, it says that this â€Å"policy would lead to a va...

Dreams

Dreams and the perspectives they have on individuals in society has led to debate, and even controversy, over that past few centuries. It’s the analysis and interpretation of dreams and how it relates to individual experience that is a central element surrounding this topic. The impact of a dream on an individual along with the influence of dream interpretation can be viewed as having a direct impact on the types of dreams people have. I will address the topic of dream anomalies and what impact dreams have on individuals as I cite literary scholars to affirm my position. There have been many great philosophers with differing opinions on the influence of dreams and whether or not there is a direct correlation between the dream process and the human’s individual thought processing and daily-life experiences. First, I considered the views of a great philosopher named William James as a foundation behind the study of dreams and its effects on individuals. William James has published numerous manuscripts backed by volumes of other philosophical material, research, and documentation. William James is considered one of the most influential people who studied the workings of the human mind, interrelationships among thought, and the consciousness of an individual. James was a naturalist, physician, professor, writer, and psychologist. His studies played a role in other philosophical studies of dream interpretation. One of his published pieces, The Principles of Psychology, had revolutionary impact on society. It was a breakthrough for the sciences of thought. Some of his well-known material was published in the latter part of the 19th century, which will be discussed in detail. The Principles of Psychology was an immense undertaking by James. My focus will look at The Stream of Thought and The Consciousness of Self segments of this work where I will state why I was convinced by his arguments surrounding consciousness and thought-processing. The reason for incorporating William James’s interpretations on streams of thought and consciousness of self is because there is a direct correlation between thought processing and the dream phase of an individual. He begins The Stream of Thought by keying into the essence of human thought. His provocative conclusions surrounding what makes us think is done in very concrete terms. He states that previous psychological texts attempting to dissect human thought are deeply flawed. Consciousness, from our natal day, is of a teeming multiplicity of objects and relations . He relates the thought processes and earlier fallacies surrounding its study with these analogies: We cannot, according to James, simply say, â€Å"it thinks† with the same conclusive logic as â€Å"it rains† or â€Å"it blows. † What we can say, however is that â€Å"thought goes on. † He goes on to discuss why every ‘thought’ or ‘state’ is part of our personal consciousness. This sets the scaffold for why and how William James came to such conclusions regarding consciousness. Prior to this, theories on consciousness lacked sufficient evidence; for previous scholars attempted to state theories without the empowering reality that James was able to express in this chapter. To add further credibility to his presumption, he states that every thought is a part of our personal consciousness and can be altered from individual to individual. Thought, he goes on to say, is in constant change. He provides examples along the way to create reasoning and proof that his methodology is credible. His description of Mr. Shadworth Hodgeson (p. 149) creates very clear evidence that individual consciousness has the ability to change and alter what it thinks and why, almost on a whim. From thought-processing, we segue into the dream experience and how they are directly related to one another in forming, sometimes jarring experiences. First, we must look at the characteristic differences between lucid and non-lucid dreams. A lucid dream, simply stated, is the state of REM sleep when a person is almost awake. The dream continues to evolve but the dreamer is aware—if only for a few seconds—that they are dreaming. Non-lucid dreaming, on the other hand, occurs when an individual is not aware of being in a dream state. The non-lucid dream is the most common form of dream. It is difficult to ascertain when and where the division between lucid dreaming and non-lucid dreaming occurs. In other words, when the dream consciousness ends and where a person is consciously aware of the dream cannot be defined. It’s purely subjective, or set aside for individual interpretation. However, the true experience of the dream can best be interpreted with the following model. The dream model links the waking-self and the dreamer. With this connection, the model also looks at what psychological levels alter self-awareness in the act of dreaming. Research, according to Laberge, has shown that over 80% of lucid dreams are transformations of a non-lucid dream. When we look at many lucid dreamers, the act of coherence or stirring from the dream is, many times, likely to occur during a nightmare or a dream that instills anxiety. The notion of anxiety can be viewed differently from one person to the next. What one person views as uncomfortable will not hold the same gravity on another person’s interpretation. It’s all a matter of personal experience. To state it simply, what brings about fear in one person may not instill that same fear in another person. This, in turn, can lead us back to individual experience. The experience and thought processing is the framework for determining lucid dreams and non-lucid dreams, which can be referenced back to our discussion on the philosopher William James. It’s important that I include a few dream examples to express the anxiety that can be instilled upon the dreamer. One dream environment occurred in a classroom. It was a riot, according to the dreamer. Again, the notion of what institutes a riot can vary from person to person. It’s also important to detail the dream, in order to give merit to the person’s anxiety. This riotous dream had a large barbarian with a heavily scarred face. He was the Goliath in the dream and locked up the dreamer in its steely grip. The dreamer could not free himself. It was at this point that the dreamer realized he was amid a dream; for he recalled other situations in his life. He gave up the struggle and instead offered feelings of love and consolation to this beastly barbarian. Yet, the beast was too ugly to love. He tried to look beyond the physical appearance and scarred features and soon beautiful words of loving acceptance flowed freely and the creature melted into him. The riot soon disappeared and the dreamer woke feeling relieved and calm. There are many other human emotions—embarrassment or delight for instance—that can institute a person into wakefulness. The number of methods used by individuals varies. What’s important to reinforce—although it may seem obvious—is the fact that individuals learn these methods in a conscious, wakeful state. Again, I go back to incorporating some of the philosopher William James’s theories to reinforce my interpretation. James gives us clear real-life scenarios to help define his theory on human conscious thought. For consideration, suppose three people instantaneously say to you: â€Å"Wait! † â€Å"Look! † â€Å"Over here! † Our consciousness is torn to decide which of the three will gain our attention first. He doesn’t deny our consciousness being able to juggle thoughts of the â€Å"wait† â€Å"look† and â€Å"over here. William James reinforces his theory by stating that there is a different ‘feel’ within our conscious thought when we experience something for the first time, versus recognizing something familiar. It could be a tune, an odor, or a familiar photogra ph that resonated memories. Again, James uses specific examples. The new experiences—or unfamiliar experience—can shake our emotions, which can strengthen recall. Also, objects in our field of vision have what James called a â€Å"fringe. † If we try to recall a forgotten name, there will be a gap in our consciousness as we search the recesses of our mind for this name. If someone tries to help us remember and gives us incorrect names, our consciousness will remain ‘at the fringe’ until we hear the name or something stirs us emotionally to recall the name. In effect, it is the overtone, or the fringe of the word or thought that generates energy within the human mind. It gives way to ideas which create the verbal kernel—as James puts it—that keeps the stream of consciousness on the move, always flowing, and always changing. James offers clear, consistent evidence to warrant credibility surrounding the intangible concepts of the stream of thought. In the following chapter, James segues into The Consciousness of Self, and brings the ego and its relationship to consciousness to the table. James builds momentum by stating humankinds’ innate desire for recognition from loved ones, and society in general, plays a part in how human consciousness develops. To bring this point home, James adds impact with this: a man has as many social selves as there are individuals who recognize him and carry as image of him in their mind. James also references a man’s honor in society by stating it has a sole purpose: to best serve our social-selves. This social grace, then, is tied to what James refers to as the self-regard. We weigh our own ‘Me’ as we perceive praise and blame. James speaks of an individual self-regard as vital; for the individual knows him or herself better than anyone else—regardless of how positive or depressing a person views themselves. It’s the emotion of self that James, in turn, speaks of as he builds on his consciousness of self. It’s the sense of personal identity that fosters the ego-thought which remains part of the individual’s stream of consciousness. From here, we look at anomaly recognition. Here, the dreamer trains themselves to understand bizarre dream events as a red-flag to bring oneself back to wakefulness. The dream interpreter uses previous dreams and/or previous life-experiences that they view as bizarre to work as a point where the conscious-self takes over and stirs the dreamer into an alert state. For, when an individual can jar oneself from a potentially nightmarish dream, their emotional consciousness, in turn, will not be affected by the dramatic negative effects of the dream. They, in effect, turn off the dream before it can be viewed in its entirety. Here’s another example of a dream with anomaly recognition: A person is stepping through a field that is colored with fairy-tale animation. There is life everywhere in this wilderness. The overwhelming image, however, are magic mushrooms (psilocybin variation). These mushrooms shoot out from the soil all over the field. Some grow to immense height and girth. The person, then, realizes that this fantasy is too dream-like to be real. Their rationalization offers the anomaly recognition to stir them from their slumber. They are able to insert lucid thoughts that say, â€Å"I must be dreaming. † The dream begins to fade as their conscious-self regains control of the person’s mind set. One more dream example that uses anomaly as a cue to clear oneself from an anxiety- driven dream can be seen in the following situation: A person stands on top of a hill that seems unfamiliar. He looks across the wide-open meadow and envisions the horizon stretching out before him. For some odd reason, the dreamer has no idea of time, or what year it is. He sees the positioning of the sun, which appears to be straight overhead. The sun is intense and bright, which is unusual. The dreamer suddenly realizes that it is autumn and the sun was much lower in the recent past. The dreamer correlates the angle of the sun in relation to the equator. His shadow, due to the angle of the sun in this season should create a shadow that is equal in height to his own. The shadow does not equal his height. So he realizes that this must be a dream. The reason I included this dream was to point out that individual interpretations on dreams can be directly related to human experience and one’s knowledge-base and educational background. Although this was not a frightful dream or one that might instill anxiety, the dreamer—due to his knowledge—ascertained that the lack of proportion in his shadow was enough to constitute an anomaly and thus free him from his dream-consciousness. There is heavy criticism surrounding the topic of lucid dreaming, which I will address in detail here. For one, even though, according to research, there is overwhelming positive feedback regarding lucid dreams, I have a difficult time taking this data seriously. Laberge and many other researchers in this field state that lucidity during a nightmare can create a fear-factor within an individual that may have dramatic effects on one’s courage and even self-esteem. I do not see any parallel significance in a person losing self-esteem due to a lucid dream. Other studies went so far as to state that mood can be altered as well. If people are affected, or say they are affected by a dream, then these results are too biased and subjective to be generalized. The attempts at generalizing lucid dreaming can be seen in the following example: One study reviewed moods in college students and the relationship to lucid dreaming. College students, it was reported, stated that if they realized they were dreaming in a nightmare that this lucidity helped them deal with the consequences of the nightmare and feel better in 60% of the cases (Lucid Dreaming Frequency p. 1). I find this rationalization too trite to even be considered in a literary study. Furthermore, they went on to state that those who experienced dying in a dream stated that the experience was insightful, and not regressive. All in all, these elements alone are too biased and opinionated to create any sound reasoning behind the notion of lucid dreaming and its effects on a person’s well-being. In conclusion, I must reiterate that the reasons for dreaming have bewildered philosophers and science enthusiasts for many years. When we look at a normal life span, a person spends close to 25 years of their life asleep. Dreams are an integral component of this. It only makes sense that there is a purpose to our dreaming that is related to personal experience. It can also be seen that dream control, in the sense of ‘turning off’ a dream so-to-speak is available to us in the form of anomalous dream situations. However, when literary criticism attempts to generalize the lucid dream with an individual’s mood, there is great concern for its validity. Dreams are in a genre that is still very blurred in its scientific evidence, and thus flawed when we try to use the dream as a developmental factor in a person’s conscious state of mind. While the discussions surrounding the purpose of dreams are far from over, at least philosophers and scientists have a captivating means into discussing how the brain creates these nightly tales of adventure.

Are Interventions With Children And Adolescents At Risk Of...

Are interventions with children and adolescents at risk of future offending effective? Discuss. CCJ10 Introduction to forensic psychology Brooke Williamson Student id- S5070501 Unit coordinator- Nicola Cheyne Research has shown that often there are risk factors involved during childhood and adolescence which predict the likelihood of an individual becoming involved in crime later in life. Such a discovery begs the question if intervening and therefore reducing these risk factors would prevent future criminality. This essay firstly will begin by explaining what is meant by children and adolescents at risk and a brief overview of the factors that can put them at risk. Secondly, it will use a longitudinal study to show that these risk factors have been associated with future offending. Thirdly a definition will be given of interventions and how they can be a useful way to prevent risk factors leading to future offending. Fourthly a study will be discussed to show a possible relationship between mental illness in a parent relating to risk factors in the child. Fourthly exploring three different methods of intervention and demonstrate their effectiveness in reducing particular risk factors rel ated to future offending, with a focus on child behavior. Lastly this essay will conclude that interventions can be a useful way to reduce risk factors and therefore help prevent future offending as a result. Generally, when referring to childhood this indicates the age fromShow MoreRelatedClassicism, Positiveism Adn Social Construction1165 Words   |  5 Pagesreference to the learning activities in Week 2, discuss the purpose and functions of the youth justice system in England and Wales in terms of your own practice and experience. Introduction In this assignment I am going to discuss the purpose and functions of the Youth Justice System. 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Wright, Avshalom Caspi, Terrie E. Moffitt and Ray Paternoster Journal of Research in Crime and Delinquency 2004 41: 180 DOI: 10.1177/0022427803260263 The online version of this article can be found at: http://jrc.sagepub.com/content/41/2/180 Published by: http://www.sagepublications.com On behalfRead MoreFamily Violence : A Social And Public Health Issue Essay2311 Words   |  10 Pagesrelationships. This type of violence is both a significant social and public health issue as it can cause economic and political ramifications. This paper will discuss the issue of family violence, factors that lead to this type of violence and its impact on individuals, their families and local communities. It will also discuss who is potentially at risk to exposure to this violence, promotion principles of mental health regarding both perpetrators and victims and the role of the nurse during family violenceRead MoreA Review of Coping Skills for Early Sexual Abuse Victims8961 Words   |  36 PagesRunning head: A REVIEW OF COPING SKILLS FOR EARLY SEXUAL ABUSE VICTIMS Laverne A. Marks Child and Adolescent Development u10a1 Integrative Project: Chapters I–V Dr. Lohr June 14,2013 A Review of Coping Skills for Sexual Abuse Victims Table of Contents Abstract†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦..†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦4 Chapter 1: Introduction†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦..†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦5-6 Theoretical Background†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦6-8 Chapter 2: Literature Review†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦8-14