Chemistry Design Prac Essay

Investigate one chemistry related factor on the deflection of the liquid flow in the presence of a charged rod Research question How will the amount of time spent rubbing a glass rod affect the angle of deflection of flowing water in the presence of the charged glass rod? Background Research Static electricity is formed in contact with two objects, where one object gains electrons from another, resulting in one object having a positive charge while the other having a negative charge. Some materials tend to lose or gain electrons during contact with other objects. Materials with electrons bonded to it weakly, tend to lose electrons while materials with fewer electrons on the outer shell tend to gain electrons. Therefore, when an object is imbalanced of a positive or negative charge, it has static electricity. Polarity is the separation of electric charges, caused when electrons are not equally shared in a molecule. This is caused when some atoms in the molecule have a higher electronegativity than others, causing more electrons to be attracted to it, leaving one side of the molecule more negative than the other. An element or molecule with an electro negativity value of 0.5+ is considered to be polar. When a polar liquid such as water is flowing in a presence of a charged rod, the liquid tend to bend towards the rod. This is because the rod will either be positively or negatively charged, and the dipoles of the polar molecule will be attracted to the charged rod. The charge on the rod is determined by the material which is used to rub against it, however, it does not matter whether the rod is positively or negatively charged because either way, the opposite dipoles of the polar molecule will be attracted towards it, causing the flow of the liquid to bend towards the charged rod. Defining Independent and Dependent Variables Independent The amount of time rubbing the glass rod with a piece of silk. – 10 seconds – 20 seconds – 30 seconds – 40 seconds – 50 seconds – 60 seconds Dependent The angle of deflection of the flowing water will be measured with grid paper with a smallest increment of 1mm. A line will be drawn on the grid paper from the point where the glass rod was places to the point where the water was deflected. A protractor with a smallest increment of 0.5 degrees will be used to calculate the angle of deflection of the water. Controlling Variables Table 1 – Variables and Method of control Type Variable Method of Control Controlled The rate of the flow of water Adjust the burette to deliver the smallest stream of water possible but without being discontinuous. The water will be kept flowing at the same rate, throughout the experiment. The glass rod The same glass rod with a diameter of 1cm will be used throughout the experiment. Pressure when rubbing the glass rod Use the same person to rub the glass rod against the silk, applying the same pressure every time. Placement of the glass rod A line will be marked on the grid paper so the glass rod will be placed at the exact point and the exact angle to the flowing water every time. Placement of the grid paper The grid paper will be sticky taped to the burette and placed as close as possible to the flowing water. The same grid paper will be used and left at the same position throughout the experiment. Weather conditions The experiment will be conducted in a room with all windows closed and air conditioning switched off to reduce effects atmospheric effects on the angle of deflection of the water. Stopwatch The one person will be using the same stopwatch every time to reduce systematic errors. Material The same piece of silk cloth (20 cm in length, 15cm in width) will be used throughout the experiment The experimenters The same two people, (person with stopwatch and person controlling the glass rod) will conduct the experiment to keep random errors in measurements and readings consistent. Materials and Equipments List: – 50 mL Burette – 20cm x 15cm silk cloth – 1cm diameter glass rod – Distilled water – 200 mL Beaker – A4 Grid paper with increments of 1mm – Protractor with increments of 0.5 degrees – Retort Stand – clamp – Pen – Ruler – Sticky tape – Stop watch Method 1. Attach the clamp to the retort stand. 2. Fill the burette with distilled water to approx 1cm from the top and attach it to the clamp 3. Draw a straight line on the grid paper with a ruler and sticky tape it to the bottom of the burette, lining up the line on the paper exactly with the flow of the water coming out of the burette. 4. Also Draw a line 90 degrees towards the line if the flowing water but stopping at 0.5 cm from the line. This line will be where the charged glass rod will be placed 5. Also mark the origin (the tip of the burette, where the water comes out) on the grid paper 6. Place the 200 mL beaker under the burette and let the water run down 7. Start the timer on the stopwatch and simultaneously, begin rubbing the glass rod against the piece of silk 8. Stop the stop watch at 10 seconds and immediately place the charged rod as close as possible to the line drawn on the grid paper 9. Mark the angle of deflection of the water on the grid paper 10. Wait 1 minute until the rod is completely uncharged 11. Repeat steps 6 – 9 12. Repeat the experiment from steps 6 – 10, changing the time rubbing the glass rod against the silk cloth by 20, 30, 40, 50 and 60 seconds. 13. Remove the grid paper and line up all the points of the deflected water to the origin 14. Measure the angles with a protractor and record the results into the table below 15. Pack up the experiment Table 2 – Raw data table Time charging the glass rod Angle of deflection of water Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 Trial 6 Average 10 seconds 20 seconds 30 seconds 40 seconds 50 seconds 60 seconds Table 3 – Risks involved in the experiment and safety precautions to reduce the risks Risk Safety Precaution Action to take The burette is very long and is made of glass and can be broken easily Hold the burette with two hands and always watch for obstacles when carrying around the lab. Wear closed in shoes, lab coat and safety glasses in case the burette breaks. Carefully pick up the large pieces of broken glass one by one and throw in the glass bin. Use a brush to sweep all the small bits into the bin. Make sure there is no remaining broken glass in the lab. Bibliography 1. Columbia University Press (1978-1979). New Illustrated Columbia Encyclopaedia 2. Neuss, Geoffrey (2007). Chemistry Course Companion. Oxford: Oxford University Press. 3. http://books.google.com.au/books?id=nkwM28diKF4C&pg=PT109&lpg=PT109&dq=deflection+charged+rod&source=bl&ots=dk2TPy7IOf&sig=g-MDZP6Q5kDsur57EIejpgJ54bg&hl=en&ei=48FrSp2bFIzusQOsy72WBQ&sa=X&oi=book_result&ct=result&resnum=2 4. Department of Physics and Physical Science, University of Nebrasky, Kearney Falling Water http://rip.physics.unk.edu/CyberTextBook/fallingwater/ 5. http://books.google.com.au/books?id=nkwM28diKF4C&pg=PT109&lpg=PT109&dq=charged+rod+deflect+water&source=bl&ots=dk2TQr4PPg&sig=iwM-1qHxsAtaF9XoGZ1Mw9UCn6g&hl=en&ei=OStsSqjFIo6qtgOT16WWBQ&sa=X&oi=book_result&ct=result&resnum=3

Causes of over Eating

The doctor told her that she was eating too much junk food and not enough health foods. The food she was eating wasn’t giving her enough energy. This is just to show how over eating unhealthy foods can affect you over all health. Over eating unhealthy foods cause serious health problems such as, heart problems, diabetes, and high blood pleasure. First, over eating can be so dangerous towards a person’s health. Heart problems are the worst sickness a person can have; in fact it’s one of the leading causes of death due to unhealthy eating. Whereas to avoid having heart problems by eating health and exercising. Greasy food causes fluid to crowd around the heart other body organs. It’s important to take care of the body so that there wouldn’t be health problems like this. Because who wants to have heart problems they get old in age no one does. Heart conditions are major issues. Second, diabetes comes from eating a lot of sugar, not burning calories, and fried foods. People with diabetes have to watch what they eat at all times. A person might look health on the outside but is unhealthy on the inside. Diabetes is a huge responsibility to withhold. A person with diabetes have to give there self a shot at least twice a day in the stomach, that’s very painful to go through. It’s obvious that people who find out that they have diabetes can’t leave a normal life anymore. Third, high blood pressure is one of the major causes of over eating. People seem to eat their pain away and its causes them to have all kinds of health problems. Dealing with high blood pressure and eating unhealthy food can really make a person have a nervous breakdown. In addition, high blood pressure it causes stress makes a person want to just eat more and more. The stress of this over eating make a person blood pressure goes up so high that it causes them to be hospitalized. Over eating isn’t good for a person with high blood pressure. Most seem to beat themselves down or just eat their hearts out because of their health problems. When people over eat the foods that they know is bad for them, in contrast its makes them have health issues. Heart problem are no good for those who have over eating addictions. Diabetes can get worse if a person continue to over eat unhealthy food. High blood pressure is very hard to deal with knowing that self is the cause of this bad health condition. Overall the cause of over eating has its down falls on a person’s way of living there life on a day to day bases. Causes of over Eating The doctor told her that she was eating too much junk food and not enough health foods. The food she was eating wasn’t giving her enough energy. This is just to show how over eating unhealthy foods can affect you over all health. Over eating unhealthy foods cause serious health problems such as, heart problems, diabetes, and high blood pleasure. First, over eating can be so dangerous towards a person’s health. Heart problems are the worst sickness a person can have; in fact it’s one of the leading causes of death due to unhealthy eating. Whereas to avoid having heart problems by eating health and exercising. Greasy food causes fluid to crowd around the heart other body organs. It’s important to take care of the body so that there wouldn’t be health problems like this. Because who wants to have heart problems they get old in age no one does. Heart conditions are major issues. Second, diabetes comes from eating a lot of sugar, not burning calories, and fried foods. People with diabetes have to watch what they eat at all times. A person might look health on the outside but is unhealthy on the inside. Diabetes is a huge responsibility to withhold. A person with diabetes have to give there self a shot at least twice a day in the stomach, that’s very painful to go through. It’s obvious that people who find out that they have diabetes can’t leave a normal life anymore. Third, high blood pressure is one of the major causes of over eating. People seem to eat their pain away and its causes them to have all kinds of health problems. Dealing with high blood pressure and eating unhealthy food can really make a person have a nervous breakdown. In addition, high blood pressure it causes stress makes a person want to just eat more and more. The stress of this over eating make a person blood pressure goes up so high that it causes them to be hospitalized. Over eating isn’t good for a person with high blood pressure. Most seem to beat themselves down or just eat their hearts out because of their health problems. When people over eat the foods that they know is bad for them, in contrast its makes them have health issues. Heart problem are no good for those who have over eating addictions. Diabetes can get worse if a person continue to over eat unhealthy food. High blood pressure is very hard to deal with knowing that self is the cause of this bad health condition. Overall the cause of over eating has its down falls on a person’s way of living there life on a day to day bases.

What makes bad logo Essay Example | Topics and Well Written Essays - 250 words - 1

What makes bad logo - Essay Example 2008). The use of computer tricks in designing a logo could also make it a bad logo. Thus, if the logo that is meant to be created by hand is created with the use of a computer, it makes it a bad logo. An example of a bad logo is the logo of the London Olympic Games. Many people actually find this logo bad and it is good to look at the reasons that, this logo has been adjudged bad. Personally, the logo looks too childish in nature, as the designers did not take the age of the adult followers into consideration. A good logo should cut across the age of its audiences and anything short of this makes the logo a bad one. Thus, the logo of the London 2012 Olympic Games is bad due to its childish nature. It makes one think that the Olympic is meant only for kids. Another thing that makes the logo for the London Olympic Games bad is the fact that, the colour scheme does not look original. One would have the feeling that, it is an imitation of the works of Nike and this should not be so. The fact that, the logo does not look original puts the credibility of the designers to

Christian (faith based) article for a newsletter Essay

Christian (faith based) article for a newsletter - Essay Example The centre has taken on social tasks that have impacted inner-city residents, many of whom have been affected in many ways by their crime ridden and socially backward neighborhoods. As Executive Director, my most important duty will be to join the dedicated team of volunteers, donors and staff in contributing to the restoration of the communities we serve and reaching affected persons. The work we do under the aegis of the Nehemiah Center is one defined and inspired by our collective Faith in God. I believe it is our social responsibility to emphasis the teachings of Christ through social programs that reach those who are in need of intervention. It is our duty to follow the examples of Jesus and show compassion to our neighbours. â€Å"Blessed are those that give†¦Ã¢â‚¬  Jesus says and â€Å"Blessed are the Peacemakers, for they shall be called the [children] of God† Our roles should truly be those of peacemakers and givers. In our communities we must dedicate time, effort and resources to the most vulnerable; our children. Children will not flourish into model citizens within a society that is destroying their hopes of a bright future. It is these young people who will inherit the pains and sadly subsequently perpetuate them if the cycle of rot is not broken and we must not lose sight of these. We should continually ask for the peace of God to reign in our communities. Although the challenges look arduous, we should be encouraged that â€Å"†¦the peace of God which passes all understanding, will keep our hearts and minds†¦Ã¢â‚¬  (Philippians 4:7). For it is only when we are at peace with Him, at peace with others, that we can truly be most effective instruments of change. The issues that we confront do not require myopic approaches that only propose band aid solutions. Instead a holistic approach that clearly identifies the short and long objectives must be adopted. These objectives

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Accounting and Finance will send you fquestions file Essay - 1

Accounting and Finance will send you fquestions file - Essay Example s that both the companies are efficient in utilizing their capital and equity to generate sufficient profits despite the fact that Wimbledon has a higher ratio than Kensington. The Net Profit Margin and Gross Profit ratio of Kensington are higher than that of Wimbledon. To make it worse, the ratios of Wimbledon are below the industry averages (Bull, 2008). The total assets turnover and non-current assets of Wimbledon is higher than that of Kensington. The ratio of Kensington was lower than the industrial averages. This implies that Wimbledon is efficient in utilizing its total assets and non-current assets to generate sufficient revenue. Apart from receivables collection period of Wimbledon being below the industrial averages, it is also below that of Kensington (Tennent, 2008). This shows that Wimbledon is very efficient in collecting its debts. The Inventory holding period follows the same trend as the receivables collection period. This reveals that Wimbledon is efficient in converting its inventory since it holds them for a short period (Berman, Knight and Case, 2013). The current ratio and decisive test ratio of both the two companies are below the industrial averages. This is despite the fact the current ratio of the two companies are above the one implying that both the two companies can at least service their current obligations with their current assets. The debt-equity of Wimbledon is below both that of Kensington and the industrial average implying that it is not heavily geared (Barrow and Barrow, 2008). Considering the above analysis, it is highly advisable that Chelsea Plc. should acquire Wimbledon than Kensington company since it has financial ratios indicate better financial performance. The directors of Chelsea Plc. should consider other information such as cash flow statements and company policy before of the two companies before making their final

Primary research Essay Example | Topics and Well Written Essays - 1000 words

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