Mary Ellen Mark: Investigative Workbook
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After the slag is removed, a final injection of oxygen removes all but a trace of sulfur. If the rule is followed, the reaction will proceed according to the mechanism in Figure 1. In the silver nitrate test, the alkyl bromide is added to AgNO3. In the sodium iodide test, the alkyl halide is added to sodium iodide in acetone. Using a toothpick, you submerged the metals in the liquid and ensured they did not touch. After minutes results were recorded in a observation table. The dependent variable in this reaction is the reaction that occured between the metals and the solution.
Part B: Using the same experimental design as part A, three drops of sodium. Purpose: To recognize the evidence of a chemical change and to prove the law of conservation of mass by observing a series of chemical reactions involving copper. A specific quantity of copper will be transformed through a series of chemical reactions to form new substances and then recovered as solid copper. A percent yield will be calculated to determine the amount of copper recovered from the chemical reactions. Many believe that doing this will create the elixir of life and change metal into gold. The role of transmutation is evident because alchemist are changing the chemical properties of one substance.
Graphite carbon electrode was polished to a mirror-like surface with 1. This is important because citrate ions complex iron and inhibit the formation of an oxalate precipitate. The formation of a precipitate film could interfere with subsequent exams. Ferric nitrate, ferric sulphate and diethylthiourea are often used as corrosion inhibitors to prevent pitting of carbon steel surfaces. For any reaction mixture to exist at equilibrium, the rates of the forward and backward reverse reactions are equal.
Conversely the equilibrium position is said to be "far to the left". Based on the stoichiometric, the theoretical yield, actual yield and percent yield can be determined. In order to calculate the percent yield, the value for theoretical yield is required. Percent yield is determined by diving the actual yield by theoretical yield and multiplying by The theoretical. The theoretical yield for Zinc Sulfide is 0.
To find the number of moles of each reactant added, volume in liters was multiplied by the molarity concentration. The second step is about finding the theoretical yield, which will help to determine the correct amount of Ca OH 2 can be made in chemical reaction. For each test, the limiting reagent is found by multiplying the number of moles of the reactant by 1 mole of Ca OH 2 and dividing then by a number of moles of reactant from the reaction. The hydrate used in this lab was Copper ll Sulfate Pentahydrate. To heat the hydrate in this lab a crucible is needed. A crucible is a heat resistant container used to heat things to high temperatures.
In this lab a mole was used to determine the measurements of all substances. Then we had to centrifuge the solution and put the supernate into two test tubes to test for ions and nickel. The reason behind this was when we added. The daguerrotype was the first publicly announced process of photography. To make a daguerrotype, the daguerrotypist would have to polish a sheet of silver plated copper to a mirror finish and then treat it with fumes to make the surface light sensitive. To take a daguerrotype, the sheet would need to be exposed in a camera for as long as was guessed to be necessary from just a few seconds to minutes depending on how well lit the subject was. This art also went through, and still is, going through development. Reading up about the history and development of the Kinetoscope interested me.
In , Thomas Edison and William Kennedy Laurie Dickson made a single-viewer peep-show device in which film moved past light called Kinetoscope. Given this, the reaction between Silver Nitrate and Hydrochloric produced aqueous nitric acid and a solid precipitate of Silver Chloride because of AgCl insolubility and all nitrates solubility. Silver Nitrate and Sodium Carbonate reaction resulted in the formation of a solid Silver Carbonate precipitate and aqueous Sodium Nitrate because of all nitrates solubility and carbonates insolubility.
The daguerrotype was the first publicly announced process of photography. To make a daguerrotype, the daguerrotypist would have to polish a sheet of silver plated copper to a mirror finish and then treat it with fumes to make the surface light sensitive. To take a daguerrotype, the sheet would need to be exposed in a camera for as long as was guessed to be necessary from just a few seconds to minutes depending on how well lit the subject was.
For the sheet to be processed, it had to be treated with mercury vapour, then treat it with liquid chemical treatment to remove the light sensitivity, rinse, dry and seal the easily ruined result behind glass. What are the strengths of a. Pinhole Camera History Words 3 Pages. There is much more to it than just clicking a button and it started all the way back in BC. Reproducing photos is a process using light and chemicals made possible by the ideas of Aristotle in BC, it 's evolution continued with the first photograph in , and now we can use modern technology to save and reproduce photos.
Aristotle may not have been the final publisher of the pinhole camera but it is noted that his references to the optic laws made it possible. Aristotle questioned why could the sun make a circular image when it shines through a square hole? In AD Alhazen invented the first pinhole camera. A pinhole camera is a simple …show more content… Later on the salt process was used, along with many others, to reproduce images which also opened doors to the instant developing photograph. The first step in the salt process is to coat a blank paper in silver chloride. Silver chloride is sensitive to light so when the picture is taken, and the water rinses off the chemicals, the image is captured by fine particles of silver that anchor to the paper.
The salt process was used mainly in the s and 50s to recreate pictures before they used the instant camera Miller. In Fredrick Scoff Archer created the wet plate negative using a viscous solution of collodion, he covered a sheet of glass with light sensitive silver salts and the glass and salts created a more detailed photograph. The instant camera, better known as a Polaroid, takes the picture on a piece of plastic film that has, silver compounds that are sensitive to light. Color film uses three layers of silver compound where as black and white has one.
For colored images each layer is sensitive to a different color and each layer reacts to that color to form the image of the light pattern. Show More. Bromohexane Lab Report Words 5 Pages The goal of the experiment is to synthesize a bromohexane compound from 1-hexene and HBr aq under reflux conditions and use the silver nitrate and sodium iodide tests to determine if the product is a primary or secondary hydrocarbon. Read More. The Disappearing Spoon Chapter Summaries Words 4 Pages Kean began this new section of the book by diving into describing the antiseptic properties of oligodynamic self-sterilizing elements in chapter Experiment Of A Wittig Reaction Words 5 Pages In this experiment, method 1 generate a mixture of yellowish crystals and a yellowish gluey product.
Synthesis Of Indigo Words 3 Pages It was able to support itself as a thin sheet, but easily fragmented when a small force was applied. Modern Day Camera Essay Words 4 Pages Introduction The modern day camera has evolved with the ever-changing technology of the twenty-first century. Camera Obscura Research Paper Words 5 Pages Talbot, through his experimentation, discovered a method to semi-permanently fix images. Methyl Benzoate Synthesis Words 4 Pages Wash ether layer with saturated sodium chloride solution and retain ether layer. Related Topics. Open Document.