Rates of reaction:- sodium thiosulphate + hydrochloric acid :: GCSE Chemistry Coursework Investigation

Rates of reaction:- sodium thiosulphate + hydrochloric acid Plan:- We must produce a piece of coursework investigating the rates of reaction, and the effect that changing one particular variable has on the reaction time. The rate of reaction is the time it takes one or more of the reactants to react or the time it takes to produce a new product from a chemical reaction. To work out the reaction time we use the formula. 1 divided by time taken for reaction There are five factors which affect the rate of a reaction, according to the collision theory of reacting particles: 1. temperature of solution, 2. concentration of solution, 3. pressure of gases in reaction, 4. surface area of reactants, 5. Catalysts. For my preliminary experiments I have chosen to investigate the effect temperature and concentration have on a reaction. I have chosen to investigate these reactants because the are the most practical for the lab and equipment that I have available to use also it would take to much time to prepare a solid in powdered and unpowdered form, and it is difficult to get accurate readings due to the inevitabilities of human errors, and as gas is mostly colourless it is difficult to gauge a reaction changing the pressure, and if a substance is added to give the gas colour, it may influence the outcome of the experiment. Similarly the use of a catalyst complicates things, and if used incorrectly could alter the outcome of the experiment. My preliminary experiments showed me that it would me more practical and time saving if I just altered the temperature of the solution as changing the concentration of the solution was very time consuming. However the preliminary experiments also helped me to choose a suitable strength of solution. Aim:- To see the effects of a change in temperature on the rate of a reaction. The reaction that will be used is: Sodium Thiosulphate + Hydrochloric Acid. Na2S2O3 (aq) + 2HCl (aq) . As I decided after my preliminary experiments I will only carry out one experiment, temperature change whilst all other variables stay constant. As both, sodium thiosulphate and hydrochloric acid are soluble in water it means that I would be able to alter the concentration of either of them. However I have chosen to vary the sodium thiosulphate as it is available in larger amounts. To alter the temperature of the solution a water bath will be used to heat up the acid, thiosulphate and water to the necessary temperature. I decided on my range temperatures and the concentration that I would use during my preliminary series of experiments - I would be using a concentration of 0.

Richard M. Nixon :: essays research papers fc

Early Life Richard Milhous Nixon grew up in Yorba, California the son of Quakers Frank and Hannah Nixon. During Nixon’s childhood in Yorba, the family was always on the edge of poverty. The lemon grove was unfruitful, and there was little money for anything beyond food and clothing for the growing family. The Nixons never ate in a restaurant or took even a brief vacation. Nixon’s early life was one of boyish stubbornness. He swam in the dangerous Anaheim Canal in spite of repeated warnings from his father, and he insisted upon standing up to ride in the family wagon, although once a fall gave him a serious head injury. He displayed a competitive streak at an early age and would never turn down a challenge or a dare. He also loved to be read to, and after age five he could read on his own. National Geographic was his favorite magazine. Education Nixon graduated form high school in 1930. He possessed extraordinary intelligence and ambition, but his ambitious nature receiv ed a serious setback that year. He graduated first in his class and won his high school’s Harvard Club award as "best all-around student." The award was a scholarship to Harvard University in Cambridge, Massachusetts. In addition, he seemed likely to win a scholarship to Yale University in New Haven, Connecticut. Nixon had dreamed for years of going to a famous college in the East, but his dreams were shattered when he had to turn down both opportunities. Because his older brother Harold’s long battle with tuberculous had drained the family’s funds there was no money to pay for the cost of traveling to the East Coast and living there. Nixon swallowed his disappointment and enrolled at nearby Whittier College. Nixon majored in history, and one of his history professors had a profound influence on his career. This was Dr. Paul Smith, whom Nixon called "the greatest intellectual inspiration of my early years." Smith was a Republican who urged hi s students to think about the importance of leadership in government. He encouraged them to consider entering public office, and he certainly helped turn Nixon’s thoughts in that direction. In 1934 Nixon graduated from Whittier College after four years on the honor roll. He applied for a scholarship to a new law school, at Duke University in Durham, North Carolina, and asked several of his professors to write to Duke, recommending him for a scholarship.

Examples from placement

Whilst on my placement, there was a girl starting school full time; named Megan. Megan was why and reluctant to Interact with the other children, I noticed this and sat down next to her. To make her feel more secure, I tried talking to her In a calm voice. When listening to her, I was showing Interest In what she was saying, by positive facial expressions I made sure I gave enough time for Megan to think about her answer and if she answered correctly, I praised her to effectively boost her self-esteem and make her feel valued.However, she asked to participate in an activity that wasn't available, I calmly said in a slow voice â€Å"you are not allowed to do that†. When she kept asking, I reinforced my previous statement, to help her understand the boundaries expected of her. After she told me what games she enjoyed, I asked if she wanted to join in with the other children. Whilst asking her, I showed her pictures of the activities. Megan asked toxin the play-doe group, so I se tup an area for her.I introduced Megan to some of the other children, so she would feel more comfortable and welcome within the group.. Throughout the day, I was making sure Mean's needs were being met, for example asking her If she needed the toilet. I felt Like Megan was at an age, where she can Independently ask for the toilet, but to be safe I asked anyway. I needed to make sure that when asking her. I spoke clearly, so she could fully understand what I was asking and she could reply appropriately.I also, needed to make sure that she knew where things were, so she felt confident going herself. So I didn't lower Mean's self-esteem, I spoke to her in an assertive tone, if I had spoken to her in an aggressive manner it would have made her feel uncomfortable talking to me. For example â€Å"Can you please help the other children clean up? During my placement, there was a three year old girl, named Victoria. Victoria and family had just moved from Russia. Her parents could speak lit tle English and Victoria none.Very shy and reluctantly, she sat in the corner, playing by herself. I decided to have 1-1 time with her, and try to build a trusting relationship. I knew she was shy because she turned her body away from me and wouldn't make eye contact with me. Violator was obviously upset leaving her parents and feeling left out from the other children. In order for Victoria to understand me I spoke In basic minting to the picture of the sandpit, because she didn't understand English and it made it easier for her to understand which activities I was saying.When I gain some for her trust, she started using eye contact and more body language. By rubbing her eyes, I sat down with her and slowly and calmly asked what was wrong. She looked at me and said â€Å"tired†. I had to have her explain to me in more detail, so I showed her pictures of a bed and of possible activities she would enjoy. I made sure that I gave her enough time to reply, without interrupting and waiting patiently, or this could sibyl lower her self-confidence.She regained eye contact and pointed to the jigsaw puzzle. I taught Victoria a few basic words in English, by pointing to the object and waiting for her to repeat the word after me in English. When she repeated the word, I made sure I had positive facial expressions and body language, and praised her when she said it correctly. It was important that I used non-verbal communication, because it would affect her emotionally, by boosting her self- confidence and self-esteem and she would comfortable talking to me.If I made no effort to acknowledge she didn't know English, this would lower her self-esteem and make her feel isolated within the setting, because she wouldn't feel comfortable coming to talk to me and make her feel like she couldn't trust me. This means, she would have trouble communicating and interacting with the other children, and she wouldn't be able to tell me any problems she has; because of the lack of trust. To build our relationship further, in return, Victoria can teach me some words/phrases in Russian. This will allow us to have conversations in her language and she can feel more comfortable.

Weathering and Erosion

Weather is the state of the atmosphere at a given time and place, with respect to variables such as temperature, moisture, wind velocity, and barometric pressure. Weather can be classified as day to day temperature and precipitation activity, where climiate is average atmospheric conditions over longer periods of time. Weather occurs from temperature and moisture differences between one place and another. These differences can occur due to the sun angle at any particular spot. The strong temperature contrast between polar and tropical air gives rise to the jet stream. Weather systems in the mid-latitudes, such as â€Å"extratropical cyclones†, are caused by instabilities of the jet stream flow. Because the Earth's axis is tilted relative to its orbital plane, sunlight is pointed at different angles at different times of the year. On Earth's surface, temperatures usually range from 0-100 degrees farenheit annually. Over thousands of years, changes in Earth's orbit affect the amount and distribution of solar energy received by the Earth and influence long-term climate Surface temperature differences in turn cause pressure differences. Higher altitudes are cooler than lower altitudes due to differences in compressional heating. Weather forecasting is the application of science and technology to predict the state of the atmosphere for a future time and a given location. The atmosphere is a chaotic system, so small changes to one part of the system can grow to have large effects on the system as a whole. Human attempts to control the weather have occurred throughout human history, and there is evidence that human activity such as agriculture and industry has inadvertently modified weather patterns. Studying how the weather works on other planets has been helpful in understanding how weather works on Earth. A famous landmark in the Solar System, Jupiter's Great Red Spot, is an anticyclonic storm known to have existed for at least 300 years. However, weather is not limited to planetary bodies. A star's corona is constantly being lost to space, creating what is essentially a very thin atmosphere throughout the Solar System. The movement of mass ejected from the Sun is known as the solar wind. On Earth, common weather phenomena include wind, cloud, rain, snow, fog and dust storms. Less common events include natural disasters such as tornadoes, hurricanes, typhoons and ice storms. Almost all familiar weather phenomena occur in the troposphere (the lower part of the atmosphere). Weather does occur in the stratosphere and can affect weather lower down in the troposphere, but the exact mechanisms are poorly understood. Weather occurs primarily due to density (temperature and moisture) differences between one place to another. These differences can occur due to the sun angle at any particular spot, which varies by latitude from the tropics. In other words, the farther from the tropics you lie, the lower the sun angle is, which causes those locations to be cooler due to the indirect sunlight The strong temperature contrast between polar and tropical air gives rise to the jet stream. Weather systems in the mid-latitudes, such as extratropical cyclones, are caused by instabilities of the jet stream flow (see baroclinity). Weather systems in the tropics, such as monsoons or organized thunderstorm systems, are caused by different processes. Because the Earth's axis is tilted relative to its orbital plane, sunlight is incident at different angles at different times of the year. In June the Northern Hemisphere is tilted towards the sun, so at any given Northern Hemisphere latitude sunlight falls more directly on that spot than in December (see Effect of sun angle on climate). This effect causes seasons. Over thousands to hundreds of thousands of years, changes in Earth's orbital parameters affect the amount and distribution of solar energy received by the Earth and influence long-term climate. see Milankovitch cycles). Uneven solar heating (the formation of zones of temperature and moisture gradients, or frontogenesis) can also be due to the weather itself in the form of cloudiness and precipitation. Higher altitudes are cooler than lower altitudes, which is explained by the lapse rate. On local scales, temperature differences can occur because different surfaces (such as oceans, forests, ice sheets, or man-made objects) have differing physical characteristics such as reflectivity, roughness, or moisture content. Surface temperature differences in turn cause pressure differences. A hot surface heats the air above it and the air expands, lowering the air pressure and its density. The resulting horizontal pressure gradient accelerates the air from high to low pressure, creating wind, and Earth's rotation then causes curvature of the flow via the Coriolis effect. The simple systems thus formed can then display emergent behaviour to produce more complex systems and thus other weather phenomena. Large scale examples include the Hadley cell while a smaller scale example would be coastal breezes. The atmosphere is a chaotic system, so small changes to one part of the system can grow to have large effects on the system as a whole. This makes it difficult to accurately predict weather more than a few days in advance, though weather forecasters are continually working to extend this limit through the scientific study of weather, meteorology. It is theoretically impossible to make useful day-to-day predictions more than about two weeks ahead, imposing an upper limit to potential for improved prediction skill. Chaos theory says that the slightest variation in the motion of the ground can grow with time. This idea is sometimes called the butterfly effect, from the idea that the motions caused by the flapping wings of a butterfly eventually could produce marked changes in the state of the atmosphere. Because of this sensitivity to small changes, it will never be possible to make perfect forecasts. Weather has played a large and sometimes direct part in human history. Aside from climatic changes that have caused the gradual drift of populations (for example the desertification of the Middle East, and the formation of land bridges during glacial periods), extreme weather events have caused smaller scale population movements and intruded directly in historical events. One such event is the saving of Japan from invasion by the Mongol fleet of Kublai Khan by the Kamikaze winds in 1281. French claims to Florida came to an end in 1565 when a hurricane destroyed the French fleet, allowing Spain to conquer Fort Caroline. More recently, Hurricane Katrina redistributed over one million people from the central Gulf coast elsewhere across the United States, becoming the largest diaspora in the history of the United States. Weather forecasting is the application of science and technology to predict the state of the atmosphere for a future time and a given location. Human beings have attempted to predict the weather informally for millennia, and formally since at least the nineteenth century. Weather forecasts are made by collecting quantitative data about the current state of the atmosphere and using scientific understanding of atmospheric processes to project how the atmosphere will evolve. Once an all-human endeavor based mainly upon changes in barometric pressure, current weather conditions, and sky condition, forecast models are now used to determine future conditions. Human input is still required to pick the best possible forecast model to base the forecast upon, which involves pattern recognition skills, teleconnections, knowledge of model performance, and knowledge of model biases. The chaotic nature of the atmosphere, the massive computational power required to solve the equations that describe the atmosphere, error involved in measuring the initial conditions, and an incomplete understanding of atmospheric processes mean that forecasts become less accurate as the difference in current time and the time for which the forecast is being made (the range of the forecast) increases. The use of ensembles and model consensus helps to narrow the error and pick the most likely outcome. There are a variety of end users to weather forecasts. Weather warnings are important forecasts because they are used to protect life and property. Forecasts based on temperature and precipitation are important to agriculture, and therefore to commodity traders within stock markets. Temperature forecasts are used by utility companies to estimate demand over coming days. On an everyday basis, people use weather forecasts to determine what to wear on a given day. Since outdoor activities are severely curtailed by heavy rain, snow and the wind chill, forecasts can be used to plan activities around these events, and to plan ahead and survive them. Studying how the weather works on other planets has been seen as helpful in understanding how it works on Earth. Weather on other planets follows many of the same physical principles as weather on Earth, but occurs on different scales and in atmospheres having different chemical composition. The Cassini–Huygens mission to Titan discovered clouds formed from methane or ethane which deposit rain composed of liquid methane and other organic compounds. Earth's atmosphere includes six latitudinal circulation zones, three in each hemisphere. In contrast, Jupiter's banded appearance shows many such zones, Titan has a single jet stream near the 50th parallel north latitude, and Venus has a single jet near the equator. Weather events influence biological processes on short time scales. For instance, as the Sun rises above the horizon in the morning, light levels become sufficient for the process of photosynthesis to take place in plant leaves. Later on, during the day, air temperature and humidity may induce the partial or total closure of the stomata, a typical response of many plants to limit the loss of water through transpiration. More generally, the daily evolution of meteorological variables controls the circadian rhythm of plants and animals alike. Living organisms, for their part, can collectively affect weather patterns. The rate of evapotranspiration of forests, or of any large vegetated area for that matter, contributes to the release of water vapor in the atmosphere. This local, relatively fast and continuous process may contribute significantly to the persistence of precipitations in a given area. As another example, the wilting of plants results in definite changes in leaf angle distribution and therefore modifies the rates of reflection, transmission and absorption of solar light in these plants. That, in turn, changes the albedo of the ecosystem as well as the relative importance of the sensible and latent heat fluxes from the surface to the atmosphere. For an example in oceanography, consider the release of dimethyl sulfide by biological activity in sea water and its impact on atmospheric aerosols.

Comparing and Contrasting

Compare and contrast the way the poets present a rustic activity? The two poems ‘Photograph of Haymaker 1890’ by Molly Holden and ‘Hay-making’ by Gillian Clarke portray rustic activity in a similar way. The poem ‘Photograph of Haymaker 1890’ consists of two stanzas and this could be linked to the fact that it is a reminiscing photo of a man who cuts hay. This shows the rustic activity due to the fact it is the poet possibly describing a relative of hers working. Whereas, the poem ‘Hay-making’ has three very short stanzas. We can link the short, fast flowing stanzas with the fact that the title seems synonymous with love making.The poet Molly Holden cleverly uses the imagery of life and death throughout her poem ‘Photograph of Haymaker’. An example being ‘to whet his scythe’ this conveys the message of death and an image of a grim reaper. Holden cleverly juxtaposes this with the phrase ‘white shirt lit by another summer’s sun’. Gillian Clarke also uses an intriguing juxtaposition, ‘these hot nights’. This juxtaposition shows a sultry image of natural passion. You could also link this to rustic activity if you imagine a worker possibly working in the night time. The tones of the two poems seem completely different from each other.Holden’s poem, ‘Photograph of Haymaker’ has a nostalgic tone ‘he pausing from his work†¦ trousers tied below the knee’. The phrases used give the connotation of the poet bringing back good memories. This is what photographs tend to do. Clarke uses enjambment as she does not use punctuations to break up the flow of her poem and this adds to the dreary tone. Towards the end of the poem we see more evidence of rustic activity. The poet Molly Holden uses enjambment throughout the last stanza, ‘sweet hay and gone some seventy years ago and yet they stand before me in the sun’.This en jambment gives the image of hay possibly falling down. We can link this to rustic activity if we create an image in our head of hay falling down in a country farm. Gillian Clarke’s poem has an interesting caesura before the word ‘Breathe’, this can be seen as a command possibly suggesting how the ritual of harvesting is metaphorically inspirational. Another important phrase which is strongly linked to rustic activity is, ‘in the scratch of the hay’. The ‘scratch’ of the hay creates a physical link between rural nature of a farm for instance and the act of human love making. We can also say that this is onomatopoeia.

Managed care creating pressure to do more with less Research Paper

Managed care creating pressure to do more with less - Research Paper Example This paper deals with the flaws and issues in the field of health care. The drawbacks and the strategies are also explained. The paper describes the need for improvement in health care and the ways in which managed care can be improved. Then the strategies are also listed with supporting arguments. Managed care was initially developed to reduce the burden of people who seek the medical attention. Medical expenses are increasing day by day and due to this people find it difficult to deal with their medical expenses. These problems led to a situation where managed care becomes an important matter of concern. (Pre 2009). Managed care mainly deals with strategies that aim at providing quality treatments at a better cost. Even employed people find it difficult to manage their medical issues and hence managed care is considered to be an important concept. The concept of managed care takes different dimensions depending on the situation and place where it is portrayed. Managed care is commonly known as the technique used to minimize the medical expenses there by providing quality health care treatments. The main aim of managed care is to reduce the burden of the patient with the help of medical insurance and financial institutions. This is achieved by mitigating the risk to the insur ance company from which a person avails his insurance. This in turn reduces the cost incurred to the patient and transfers the rest of the monetary operations to the concerned insurance firm. Managed care has certain limitations and ethical concerns which form the major part of managed care. These ethical concerns depend on the type of problem and the way in which managed care is perceived. In an organization which provides medical benefits to an employee relies on an insurance company that helps the organization to reimburse the employee’s medical expenditure. This certainly reduces and minimizes the expenses of the employee. But this may not prove to be beneficial in all the

Heritage Assessment in Health Promotion Essay Example | Topics and Well Written Essays - 750 words

Heritage Assessment in Health Promotion - Essay Example Upon interviewing three families from different cultural backgrounds, it became obvious that the differences in health practices are sometimes rooted in religious beliefs, which is of course, a large part of the culture. An effective health care provider has to understand that some people from certain cultural backgrounds may be more sensitive regarding their health practices and beliefs, particularly if it has a religious basis. For example, an Orthodox Jewish woman recounted her story when she gave birth to her first child. She went through long and severe labor pains that were eased only by consistent back rubs. Her husband could not touch her because according to Orthodox Jewish beliefs, women undergoing labor are â€Å"unclean†. Her husband and the attending nurse at that time had a minor argument regarding who should continue her back rubs, with the nurse believing that the husband could help since the nurse had other patients to attend to. She also mentioned that women should only do the caring for the sick. Consequently, it is not acceptable for men to attend to women who had just given birth. Food intake is also different, as Jewish people has a specific standard for acceptable foods, making sure that everything is â€Å"Kosher† (a symbol ensuring that food is prepared in line with the Orthodox Jewish regulations). (Galanti, 2008, p.82). Another example is stated by a traditional Muslim female from Abu Dhabi. This woman mentioned that they are particular in their food intake, just like the Jews, ensuring that everything is â€Å"Halal† (a symbol ensuring that food is prepared according to Muslim law) (Galanti, 2008, p.87). This could pose a concern, for example, in determining a patient’s diet, as the medical practitioner should guarantee that the diet plan coincides with the patient’s beliefs and lifestyle. Health conditions are also referred to gender-specific doctors (male doctors for male patients and female doctors for female patients), and health care is only acceptable from same-gender caregivers. According to the interviewee, even in emergencies, some traditional Muslims could demand medical attention to be provided only under acceptable Islamic conditions. Another good example is provided by a Chinese exchange student who grew up in Mainland China. She mentioned t hat her family is very traditional when it comes to health care. HERITAGE ASSESSMENT 4 She