Practical Chemistry Report Essay Example | Topics and Well Written Essays - 1750 words

Practical Chemistry Report - Essay Example Molar absorptivity is fixed the moment the reactant is fixed, cell length is standardized and therefore, its effect is also fixed. Now only variable deciding intensity of the absorbed and therefore transmitted light is the concentration of the reactant. Therefore, concentration of the reactant at a particular time can be read directly from the detector reading of the transmitted light. Care should be taken to subtract the reading corresponding to the bare solution i.e. the solution having no reactant. Data from both the experiments has been plotted separately on semi log scale i.e. ln[A] was plotted against time t (s) using excel software. Data points were plotted as a X-Y scatter plot and a linear interpolation was used as nature of the plot for the first order reaction is linear from the theory. Slope of the line gives value of the rate constant ÃŽ » and the intercept gives value of the initial concentration i.e. [Ao] Figure 1 shows variation of ln[A] vs time for Experiment 1. The close proximity of the data points from the linear interpolation line confirms that all the data points are very accurate. The same is confirmed by very high value of R2 which is 0.9929. One should note that value of R2 being 1 means all the data points will fall on the interpolation line. That is the ideal condition which never happens in actual experiments. There is another useful parameter half life (t1/2) associated with a first order reaction kinetics. This is the tie period during which concentration of the reactant is reduced to half of its original value. Value of half life (t1/2) can be calculated by putting [A] = [Ao]/2 and setting t as t1/2 in the integrated form of the rate equation derived above. This comes out to be In experiment 1 value of the rate constant (ÃŽ ») is 0.0006. Therefore, value of half life comes to be 1155 second. One should check in the experimental data whether really [A] is halving in every 1155s. What we find is that

Media Relations Assignment Example | Topics and Well Written Essays - 250 words - 3

Media Relations - Assignment Example Quite the contrary: There’s so much information nobody can find anything† (Howard & Mathews, p. 3). Personally, I find it easy to be able to perform a quick Google search to be able to locate the information I need, whether it is a quote from a book, an excerpt from a script, or even a search in EBSCO to obtain necessary sources. I would like to look further into where they obtained this information; is it simply because it is someone of an older generation who is saying this, someone who hasn’t grown up with the internet, and as such, does not have the necessary skills to be able to narrow down their keywords for their search, or is it something more? In On Deadline: Managing Media Relations, the next thing to surprise me was the comment that â€Å"print is not dead† (Howard & Mathews, p. 4), where they go on to state that â€Å"the print media are still competitive and willing to take steps to adapt to todays’ readers† (Howard & Mathews, p. 4), while it makes sense that electronic print media is on the rise, and though the idea of magazines still being published in print form makes sense, it seems that print newspapers would start to die out, as readership grows online. I would like to learn what the true statistics are for this, and if it is really actually still feasible from an economic standpoint that they continue to make actual print newspapers for much longer. Finally, the third thing that surprised me was the idea presented in â€Å"Handling the Difficult Interview† that if there is a media crisis, that it is in the company’s best interests to â€Å"disseminate friendly evidence† (Krattenmaker, p. 4), even if the scandal is false. It would seem to me that simply a denial of the issue would suffice, but instead it is suggested that friendly evidence also be provided as well; while this may be worthwhile from a public relations standpoint, in some cases, it does not seem like it would be a benefit overall, and in fact would serve to

Memory Test For Positive And Negative Words Psychology Essay

Memory Test For Positive And Negative Words Psychology Essay In the subject of Word Memory, many different types of researches have been done in the past. In many of these researches we can find that many different factors affect the way we remember some words. Examples of different factors are familiarity, imageability, arousal, and valence. In this particular study we took a look at one of these factors, negative and positive words. The subjects in this experiment were shown a list of 20 different words, and our hypothesis: subjects with low mean age will remember more negative words than positive ones. However we did not find any relevant difference between the two groups of words, more extensive studies could be carried out on the subject to see relevant differences. Introduction. There has been broad different researches in the field of Word Memory, and experts have been trying to figure out whether word recollection is affected by different variables. In some experiments it has come to light that word recollection is greatly affected by word concreteness. Concrete words are easier to remember than abstract words (Walker, Ian; Hulme, Charles, 1999). But yet it is not the only factor that can affect word memory. In some other cases, it was shown that the results were affected by the frequency of the words. As shown in the study conducted by Robert E. Guttentag and Donna Carroll (1997), word recollection is greatly affected by the frequency of the words: The findings indicated that subjects were better at remembering the mental operations utilized at study for low frequency than for high frequency words. In this research in particular we are going to focus on the emotionality of the words, such as positive and negative words. In long-term memory, negative information is better remembered than neutral information. Differences in processes important to working memory may contribute to this emotional memory enhancement (Kensinger, Elizabeth A.; Corkin, Suzanne, 2003) As stated emotion in memory can have quite a big impact. The way we feel about words meaning can greatly change the amount of time we will remember that specific word. In another experiment, subjects were depression induced, and had to undergo recollection of words. The experiments showed that emotion played a key role into the controlled group and the other. The subjects were recolling words based on the emotions induced from the experimenters. (Bradley, Mogg, Galbraith Perrett, 1993). Our goal is to investigate on the effect of emotionality in words recollection. Subjects will be shown 2 different groups of words for a total of 20 words. Negative words and Positive words. Since pre-experiment we knew that the age of the participants and size of the group were relatively small, we hypothesized that the participants will remember negative words more than positive words. Methods. Design: The experiment was a within subject design and the controlled variable was the valency of the words, positive and negative. The number of the words that each participant would remember was the dependent variable. The problem of order effect was overcome by creating two separate powerpoint presentations. The order of the words was also different and randomized. Participants: All of the participants were part of the psychology class at Aberdeen university. 16 subjects. Out of all the participants only 1 was male, the rest 15 were females. The mean age of the participants was 20.69, with a SD of 2.44 Apparatus: The main tool of the experiment were presentations done by using PowerPoint. All the subjects were presented with 20 words (10 positive 10 negative). The source were we took the words is Bellezza, Greenwald and Banajis (1986) catalogue of words. The 20 words were on a pleasantness scale. Positive pleasantness mean: 4.50, negative pleasantness mean: 1,64. In order to randomize and finding out the mean of pleasantness of the words also the program Microsoft Excel was used. Later for the results and analysis, a software named Statistical Package for Social Science was used. Procedure: Each subject was given a computer were the power point presentation was started. The presentation gave the instructions to each participant. The first slide showed the participants that they would be shown a list of 20 words, each word was shown on screen for only 2 seconds. Afterwards they would have to remember as many words as they could from the ones shown. It also said that between the acquisition and recollection of the words they would take a 2 minutes mathematical questionnaire, and then they could write down as many words as they could remember from the slides. After the experiment was over, we recorded the results of each participant and their sex and age. We then took those results and analyzed them using SPSS. Results. The results were the following: the mean number of words remembered for negative condition was 4.00 with a SD of 1.63, the standard error was 0.41. Instead for the positive condition, the mean was 3.69 with a SD of 1.54 and the standard error of 0.38. The results can be seen in chart below (Figure 1). Figure 1. Means for both negative and positive scores. Each top bar rappresents the plus or minus 1 for standard error. Since the results shown in Figure 1 very similar to each other, more analysis had to be done. A paired samples t-test was used in this case. The t-test showed that the mean for positive condition was 3.69, with a SD of 1.54. The mean for the negative condition was 4.00 with a SD of 1.63. Therefore the results showed us that there were no relevant differences between the two condition. Due to the results been non-significant, we can state that our hypothesis is not supported and it could be rejected. Discussion. According to Thomas Hasher (2006), the phenomena stated in our hypothesis would happen if the subjects were of younger age. Unfortunately as we saw in our results, our hypothesis, that negative words would be remembered more than positive words, was rejected. This could be due to different factors such as sex, age (Thomas Hasher, 2006), ethnicity and numbers of subject. Many different things could be the reason why we did not receive the results we were expecting. For example, the number of our participant was limited to 16. In a case where we would of have 100 or 1000 we could of seen the differences in the means curve. Also the words were a limited number. A list of 20 words could be too few to prove the hypothesis. For future studies these aspects should be observed and improved in order to see results more towards to our hypothesis. Conclusion. To conclude, the results in this experiment were not to expectations. The low number of participants and the list of few words were the main factors for these results. In future experiments perhaps we would take in consideration these factors and also improve other particulars, such as space where the experiment is taken; perhaps a single room for each participant would have impact on the recollection of words (less distractions). And also the time and task before the recollection, could be a bit longer time and different/more challenging task.

Safety Features in Automobiles Essay -- Expository Essays Research Pap

Safety Features  in Automobiles "Motor vehicle crashes are the number one killer of Americans under the age of 34. Every 22 minutes someone is killed in a crash" (Vince and Larry). Since 1990, many new safety features have been put into vehicles to help save lives. These features are Antilock brakes, airbags, OnStar, and four-wheel drive or all wheel drive. "One of the best safety features available is anti-lock braking system" (Gillis). Antilock brake system (ABS) is a safety feature that keeps the brakes from locking up so the driver can maintain control over steering and directional stability in situations where the driver has to apply heavy brakes, heavy enough that if the vehicle was not equipped with ABS, the brakes would lock up. ABS is usually engaged on slippery road surfaces, when traction is minimal. If a person's brakes lock up on a slippery surface, then the vehicle could loose steering control and the vehicle could spin. ABS could help a person avoid an accident because it allows a person to maintain steering control of the vehicle (Questions and answers...). In a vehicle not equipped with an antilock brake system, the driver has to manually pump the brakes to keep from sliding. ABS works by sensing each wheel's speed. When the sensors detects that the wheels are about to lock up, the ABS computer automatically changes the amount of brake fluid being sent to each wheel. With ABS engaged, the vehicle will "Maintain optimum braking performance---just short of locking up the wheels." The computer will keep adjusting the brake pressure as the road conditions change (Antilock brake systems ...). The four main parts of an antilock brake system are the speed sensors, the pump, the valves, and the controller. Th... ...ve.htm National Highway Traffic Safety Administration. (1996). Moving * forward: expanding collaborations between traffic safety and public health. MA. Education Development Center, inc.. National Highway Traffic Safety Administration. (1998). Questions and * answers regarding antilock brake systems (ABS). U.S. Department of Transportation. National Highway Traffic Safety Administration. (1999). New car safety features. U.S. Department of Transportation. National Highway Traffic Safety Administration. (2000). Antilock brake * systems (ABS): reading this could be one of the safest things you ever do. U.S. Department of Transportation. OnStar. (2002). What is OnStar: services. Retrieved March 14, 2003, from http://onstar.com/visitors/html/ao_features.htm "Vince and Larry." (1991). Vince and Larry on belts and bags. U.S. Department of Transportation.

American Dream In the 1920s Essay

In the 1920s, many Americans were trying to achieve the infamous â€Å"American Dream.† The dream was to be rich, successful, happy, and one of the social elites. However, even though this was the dream for Americans in the 1920s, the general standard has changed over the years into the present time. Since the 1920s, the dream of putting a high emphasis on an individualistic and materialistic life has evolved into a present day dream of working hard, holding a well-paying job, and raising a family. The 1920s was an era of declined social and moral values, as shown by its increased pursuit of pleasure. When World War I ended in 1918, the young Americans who had fought the war became deeply disillusioned, as the battles that they had just fought in made the Victorian social morality of the early 1920s seem like hypocrisy. This caused those that had fought in the war to not care as much about upholding traditional morals. Also, since World War I was the â€Å"war to end all wars,† Americans were quite optimistic during the 1920s. The uncontrolled satisfaction that led to self-indulgent parties and wild jazz music resulted ultimately in the corruption of the American dream, as the uninhibited desire for pleasure exceeded other, less important goals. Americans’ pursuit of pleasure in the 1920s resulted ultimately in a decline in values. Many of the values of today’s dream are similar to those of the 1920s. The dream today does consist of pleasure and happiness. However, the dream of the 1920s was to put a much stronger emphasis on it than today’s dream does. The values and morals today are also more widely accepted by the general public. An example of this is women wearing bathing suits to a public beach. In the 1920s, it was bad enough that those bathing suits were even the l east bit revealing. Today, however, it is perfectly acceptable for women to wear bikinis to a public beach, which are much more revealing than those of the 1920s. This is because the standard has gradually changed over time. Many of the values of the 1920s were extremely new and deviated from the norm greatly. The â€Å"new† values crashed right into the 1920s with the emergence of the flapper, a new generation of women who bobbed their hair, wore short skirts, and listened to jazz music. People had no time to adapt to these values. On the other hand, the values of the modern American dream were gradually incorporated. Americans today have been around these values long enough that they are now accustomed to them. During the 1920s, family life was both similar and different than it is now. Advancements in industrial production and technology enabled ordinary Americans to acquire what once had been unattainable luxuries, such as automobiles. These luxuries that were part of everyday family life in the 1920s are still part of the dream today. There are, however, differences between family life of the 1920s and modern family life. In the 1920s, husbands were the â€Å"breadwinners† for their families. While the men were at work, their wives cooked, cleaned, and looked after the home. Wives also did most of the raising of the children. Women in the 1920s did hold jobs, but that was something more for young, single women. Married women typically did not obtain a job because it would cause them to take their focus off of taking care of their family. The dream today is that both men and women perform equal shares of raising the family. Instead of just the men holding jobs, women also hold jobs today. Instead of just the women caring for the home and children, men also take part. Through these efforts, Americans can hope to achieve the part of the dream of raising a family. Throughout the 1920s, Americans went on a spending spree. The rise of the stock market led to a sudden increase in the national wealth and created a society full of materialism. People began to consume and spend more than ever, and they had the idea that money and popularity would solve everything. A person from any social background could, potentially, strike a fortune. Speculators and industrialists who achieved the American dream in the 1920s of â€Å"getting rich† were labeled the â€Å"new money.† The aristocracy disliked the new money. The so-called â€Å"old money,† families that had always had money that was passed down from generation to generation, felt that the â€Å"get rich quick† ways of earning money were not as fulfilling as the traditional ways. Today, money is valued differently than it was in the 1920s. The dream is not centered so much around money as it used to be. Yes, money is still just as important, but people nowadays keep other goals in mind other than just earning money. The dream today consists of having a job that pays well and that is enjoyable, not just a job that only pays well. Another part of the American dream that women had in the 1920s was equal rights with men. The ratification of the Nineteenth Amendment in 1920, which allowed women the right to vote, helped them come even closer to having equal rights with men. In the dream today, women seem to not be as concerned about women’s rights as they did in the 1920s. This is due to the fact that most of the work that needed to be done has already been done, such as the women’s rights movement and the ratification of the nineteenth amendment. Today, on average, women earn 77 cents for every dollar that men earn. Women still hold far less ownership, CEO, and other high positions within companies than men. These two facts are evidence that work still remains in the struggle for equal rights for women. However, women definitely came a long way and it is only a matter of time before they are equal with men, for most of the work has already been done. In the 1920s, there seems to have been an American dream that everyone was trying to achieve. Many people looked and some still do look toward this as a model for their own individual American dreams. However, even though this might have been the dream for many Americans in the 1920s, the general standard sure has changed over the years into the present time. Since the 1920s, the dream of putting a high emphasis on â€Å"materialistic† life has evolved into a present day dream of working hard, holding a well-paying job, and raising a family.

Act I Scene I of the text of Romeo and Juliet Essay

In this piece of coursework I will be comparing and contrasting Act I Scene I of the text of Romeo and Juliet and also the same scene in the Baz Luhrmann. William Shakespeare wrote the play was written between 1594 and 1596, was called Romeo and Juliet, this would be Shakespeare’s first play that ended in tragedy. The story of Romeo and Juliet was popular in Italy before Shakespeare decided to use it. Queen Elizabeth I was on the throne when it was performed. The recent versions of the play have been adapted many times because some directors have either changed the play version or have updated and rewritten the play script to appeal to a wider audience another point is that boys and men would have only been in the play until the 1660’s. The text starts after a prologue,† Do you bite your thumbs at us sir? † this is written in archaic language, this shows that William Shakespeare wrote the play during the Elizabethan times. Characters such as Gregory, Sampson, Abraham, Benvolio, Officer, Capulet, Lady Capulet, Montague, Lady Montague, Prince and Tybalt are involved in Act One Scene One, which have a result in the overall plot of the play; the two characters Gregory and Sampson are blamed for causing another brawl in the market place. However in the film the play starts the same with a prologue and then starts with the two families fighting at a petrol station. The three characters I am going to choose are Abraham, Romeo and Benvolio. I have decided to choose them because they are some of the key characters in the first act of the play and in the first act of the film. Luhrmann decides to change the name of Abraham to Abra, this is because in the modern day people would have their names shortened and it would be easier to relate to them. Luhrmann decides to dress the Capulets in Hawaiian shirts and the Montagues as cowboys. Luhrmann has decided to do this to show how the two families are totally different. The way they dress gives them their own identity. The Montagues dressed as cowboys to show that they are ruthless and aggressive however the Capulets dressed in Hawaiian shirts show that they are laid back and relaxed. Structure The setting for the play is in Italy, Verona in the early fifteen century. In Act One Scene One the play is set in Sycamore grove as well as the market place. This is where the play begins when two of the Montague family members are walking down the market place when they see a Capulet, and then they start quarrelling. The setting of Act One Scene One takes place in a petrol station where the Capulet’s and Montague’s meet, there is a small fight and bullets are exchanged between the two families. Before a car drives off and Tybalt takes out his gun and shoots the passenger in the car in the head. During the fight in the petrol station a fire was started by a match igniting petrol on top of a crack in a ground in the shape of a gross. This also showed that religion had a part in the feud. The crosses on the back of there heads showed their religion, Montagues were Protestants and Capulets were Catholics. Every serving man had a pistol with a motif, which was unique to the two families. Pistols in the film were called swords even though guns were replacing swords from the text. Pistols had distinctive motifs on them, representing what family’s they came from and whether they were protestant or catholic. The men also had their haircuts representing their families and had tattoos repenting their families too. The film is introduced to us by a series of quick photos with the characters names that introduce us to the characters. This film is very modern, you can tell this by looking at the cars and the way the people dress in Hawaiian shirts.

Free Essays on Norway

Norway: From It’s Past To It’s Present For ages ago, appeared the forefathers of what is the present day Norway. In a time of 10,000 years ago, these early Norwegian were mainly relayed on their prey such as reindeer. There is no historical agreement to where these ancestors had appeared from. Below I will explain the history of Norway from its past to its present. Some of their artifacts were of the same type had been discovered in Southern Sweden and in Denmark. Examples of these artifacts are claimed to be flint tools, clay vessels, art, and rock carvings. By the Bronze Age which had appeared in the 1500 to 500 BC, had started a turning point in the Norwegian history. Through the majority of the population were hunters, some had found advancements and technologies for agriculture. In the Roman Age ( 0-400 AD) was the beginning of more advancements and people began to become more civilized. Many of these advancements were the discovery of glass, weapons, bronze utensils, and the art of writing and communication. These writings were in a form of runic letters, which became popular in the Nordic times. Around the year 400 scientist and historians have found out that the Nordic forefathers began to migrate most of the time. The era of the Vikings marks a historical stand point in the prehistoric Norway. Through without written sources, the Vikings had left many archaeological remains, and stories which were inherited by mouth to generation to generation. It also has been said that out of the prehistoric period in Northern Europe, the Viking age was the richest of the all. For the early Vikings their job were mainly settled in Northern Scotland and Ireland. They were also sailors and explorers. The most two popular explorers were Eric the Red, and Leif Ericson. With their advancements, they were able to build worthy ships. The areas explored and traveled were countries such as Greenland, Iceland, and America... Free Essays on Norway Free Essays on Norway Norway Norway is a country that offers something for everyone. It’s a country of rich and diverse natural landscape that provides a fantastic setting for people. Norway’s conventional long form name is, Kingdom of Norway. Norway’s government type is a constitutional monarchy. The Norwegian government places emphasis on ensuring that all parts of the county have a share in the nations assets. Also, each country is encouraged to develop its own industrial and commercial base. Government control key areas, such as the petroleum sector and subsidize agriculture, fishing and sparse resources. The Norwegian legal system is a mixture of customary law, civil law system and common law traditions. Supreme Court renders advisory opinions to legislative when asked and accepts compulsory jurisdiction with reservations. The parliament is always informed when amendments to the formal framework for the operation of the Fund are made. The Political parties in Norway are: Center Party, Christian Peoples Party, Conservative Party, Labor Party, Liberal Party, Norwegian Communist Party, Progress Party, Red Electoral Alliance and Socialist Left Party. The Prime Minister of Norway is Kjell Magne Bondeuik and 19 other ministers’ work with him. The Norwegian economy is a welfare capitalism, featuring a combination of free market activity and government intervention. It is thriving and healed for further growth. The country is richly endowed with natural resources; petroleum, hydropower, fish, forests, and minerals. Also, it is highly dependent on its oil production and international oil prices. Norway is a major shipping nation with a high dependence on international trade and is basically an exporter of raw materials and semi-processed goods. Norway’s core markets include the Nordic region and Europe and the export horizon is steadily broadening. Norwegian companies invest for long term and are world leaders in sectors, such as maritime... Free Essays on Norway Norway: From It’s Past To It’s Present For ages ago, appeared the forefathers of what is the present day Norway. In a time of 10,000 years ago, these early Norwegian were mainly relayed on their prey such as reindeer. There is no historical agreement to where these ancestors had appeared from. Below I will explain the history of Norway from its past to its present. Some of their artifacts were of the same type had been discovered in Southern Sweden and in Denmark. Examples of these artifacts are claimed to be flint tools, clay vessels, art, and rock carvings. By the Bronze Age which had appeared in the 1500 to 500 BC, had started a turning point in the Norwegian history. Through the majority of the population were hunters, some had found advancements and technologies for agriculture. In the Roman Age ( 0-400 AD) was the beginning of more advancements and people began to become more civilized. Many of these advancements were the discovery of glass, weapons, bronze utensils, and the art of writing and communication. These writings were in a form of runic letters, which became popular in the Nordic times. Around the year 400 scientist and historians have found out that the Nordic forefathers began to migrate most of the time. The era of the Vikings marks a historical stand point in the prehistoric Norway. Through without written sources, the Vikings had left many archaeological remains, and stories which were inherited by mouth to generation to generation. It also has been said that out of the prehistoric period in Northern Europe, the Viking age was the richest of the all. For the early Vikings their job were mainly settled in Northern Scotland and Ireland. They were also sailors and explorers. The most two popular explorers were Eric the Red, and Leif Ericson. With their advancements, they were able to build worthy ships. The areas explored and traveled were countries such as Greenland, Iceland, and America...