Chemistry Design Prac Essay Example for Free

Chemistry conception Prac EssayInvestigate one chemistry related factor on the bending of the tranquil guide in the presence of a charged rodResearch questionHow give the amount of sentence spent rilebing a frappe rod affect the angle of disorderion of flowing piss in the presence of the charged crackpot rod?Background ResearchStatic electricity is make in contact with two objects, where one object do goods electrons from another, resulting in one object having a ap masterminded charge while the other having a negative charge. Some materials dispose 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 time interval of electric charges, cause when electrons are not equally shared in a iota. 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 look 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 pee is flowing in a presence of a charged rod, the liquid tend to bend towards the rod. This is because the rod get out either be positively or negatively charged, and the dipoles of the polar molecule exit be attracted to the charged rod. The charge on the rod is set 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 lowage covariantsIndependentThe amount of time rubbing the glass rod with a piece of silk. 10 se conds 20 seconds 30 seconds 40 seconds 50 seconds 60 secondsDependentThe angle of deflection of the flowing water will be measured with grid paper with a smallest increment of 1mm. A arguing 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 VariablesTable 1 Variables and Method of controlTypeVariableMethod of ControlControlledThe rate of the flow of waterAdjust the burette to deliver the smallest stream of water possible but without being discontinuous. The water will be kept flowing at the kindred rate, throughout the examine.The glass rodThe like glass rod with a diameter of 1cm will be used throughout the experiment.Pressure when rubbing the glass rodUse the same person to rub the glass rod against the silk, applying the same pressure all(prenominal) time.Placement of the glas s rodA melody will be grimeed 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 paperThe 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 conditionsThe experiment will be conducted in a room with all windows closed and air conditioning switched off to rationalise effects atmospheric effects on the angle of deflection of the water.StopwatchThe one person will be using the same stopwatch every time to reduce systematic errors.MaterialThe same piece of silk cloth (20 cm in length, 15cm in width) will be used throughout the experimentThe experimentersThe same two people, (person with stopwatch and person controlling the glass rod) will conduct the experiment to suffer 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 compile Ruler Sticky tape Stop watchMethod1. Attach the clamp to the retort stand.2. accept the burette with distilled water to approx 1cm from the top and attach it to the clamp3. Draw a straight note 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 placed5. Also mark the phone line (the tip of the burette, where the water comes out) on the grid paper6. Place the 200 mL beaker under the burette and let the water run down7. Start the timer on the stopwatch and simultaneously, lay out rubbing the glass rod ag ainst the piece of silk8. Stop the stop watch at 10 seconds and at once place the charged rod as close as possible to the line drawn on the grid paper9. Mark the angle of deflection of the water on the grid paper10. have a bun in the oven 1 minute until the rod is completely uncharged11. twin steps 6 912. 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 origin14. Measure the angles with a protractor and record the results into the table below15. Pack up the experimentTable 2 Raw data tableTime charging the glass rodAngle of deflection of water running 1 ravel 2Trial 3Trial 4Trial 5Trial 6Average10 seconds20 seconds30 seconds40 seconds50 seconds60 secondsTable 3 Risks involved in the experiment and safety precautions to reduce the risksRiskSafety PrecautionAction to addressThe burette is very long and is made of glass and can be gloomy easily confuse the burette with two hands and always watch for obstacles when carrying around the research lab. Wear closed in shoes, lab coat and safety glasses in case the burette breaks.Carefully pick up the blown-up 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.Bibliography1. Columbia University Press (1978-1979). New Illustrated Columbia Encyclopaedia2. Neuss, Geoffrey (2007). Chemistry Course Companion. Oxford Oxford University Press.3. http//books.google.com.au/books?id=nkwM28diKF4Cpg=PT109lpg=PT109dq=deflection+charged+rodsource=blots=dk2TPy7IOfsig=g-MDZP6Q5kDsur57EIejpgJ54bghl=enei=48FrSp2bFIzusQOsy72WBQsa=Xoi=book_resultct=resultresnum=24. 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=nk wM28diKF4Cpg=PT109lpg=PT109dq=charged+rod+deflect+watersource=blots=dk2TQr4PPgsig=iwM-1qHxsAtaF9XoGZ1Mw9UCn6ghl=enei=OStsSqjFIo6qtgOT16WWBQsa=Xoi=book_resultct=resultresnum=3