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An experiment to obtain Zinc Oxide from Calamine

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-1- Jack Mariner Chemistry Coursework An experiment to obtain Zinc Oxide from Calamine Research Zinc has the symbol Zn. It is a bluish-white metallic element that has many industrial applications. Zinc is one of the transition elements of the periodic table. The atomic number of zinc is 30. The ores of zinc have long been known, but zinc was not recognised as a separate element until 1746, when the German chemist Andreas Sigismund Marggraf isolated the pure metal by heating calamine and charcoal. Uses: The metal is used predominantly as a protective coating, or galvaniser, for iron and steel; as an ingredient of various alloys, especially brass; as plates for dry electric cells, and for die-castings. Zinc oxide, known as Zinc white or Chinese white, is used as a paint pigment. It is also used as a filler in rubber tires and is employed in medicine as an antiseptic ointment. Decomposition: In chemistry, decomposition is the breaking down of a substance or compound, through a chemical reaction, into its simpler components. Such reduction may yield either elements or compounds as products. A common agent of decomposition in chemistry is heat, which can reduce both inorganic and organic compounds to their constituents. Water, for example, decomposes into hydrogen and oxygen when exposed to an electric current. Also, chemical action, as by the use of acids or alkalis and as accelerated by catalysis, is used in laboratories to reduce compounds. Introduction I am going to carry out an experiment, which involves the heating up of Calamine and weighing it at different intervals. ...read more.


This weight can then be used later to establish the individual weights of everything in the test tube. -6- Jack Mariner Chemistry Coursework Next, the Bunsen burner can be set up, ready to work. This will be positioned on a heatproof mat so as not to burn the working surface underneath. The flame will be on a roaring blue flame, and the bottom of the test tube will then be placed at the top of the inner blue cone (hottest point). See (pic 1). This will stay here for 2 minutes. We will then wait for the test tube to cool down; at that time we will weigh the test tube and its contents using the same electronic scales as before, subsequently recording the results. We will then return the test tube to the Bunsen burner. This will be repeated until the weight of the test tube with its contents is identical. E.g. 1st reading= 17.24g, 2nd reading= 17.18g, 3rd reading=17.15g, 4th reading=17.15g The underlined readings are identical; consequently I would stop and record these readings. I would do it like this because when the readings are the same it means that the reaction has stopped and there is no need to go any further. This is done for every amount. Fair Test There are many things that can be done to keep this experiment a fair one. Firstly the same test tube must be used as all of them have different weights. The amount of time you leave the test tube on the Bunsen burner is also crucial, as it would not be a fair test if you left one test tube in the heat longer than the others. ...read more.


-12- Jack Mariner Chemistry Coursework Conclusion From 'graph 3', you can see that my hypothesis is of high quality stating that I predicted a graph with strong positive correlation. This was almost a perfect prediction. My conclusion really for this experiment is that as the amount of Calamine increases so does the amount of Zinc Oxide produced from this. Theoretically this is done proportionately, but actually anomalous results interfere, leaving the results strongly related with strong correlation as apposed to a theoretical graph with perfect correlation. Evaluation I consider this experiment to be a success. The plan was followed very well and the results were of good quality. The measurements were done accurately, and a fair test was achieved. The procedure used was also a very fair and efficient one. Although the experiment was a success, I am still bothered by the fact that anomalous results occured in my experiment. I think that the reasons for these results were because of time limitations. We had very little time to accomplish this task successfully, so mistakes were inevitable. The improvements, which could be made in doing this experiment, are to have a longer time to do the experiment so that isn't done making careless mistake and if mistakes were made, there would be enough time to redo what was needed. Secondly more high tech equipment could be used to get more reliable and accurate results. Also, an essential thing is for the Calamine used to be pure. This is important because impure calamine could react at a different rate to more pure Calamine. This would have a huge bearing on the final result. Lastly, more readings could have been taken. This would lead to averages being taken giving better results. ...read more.

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