Chemistry coursework iodine clock reaction

Chemistry coursework iodine clock reaction

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Home chemistry coursework iodine clock reaction

Rates of reactions

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Due to the development of technology, this discipline has been able to progress and flourish.

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Help for chemistry coursework! iodine clock reaction?

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A chemical stop-clock - iodine clock reaction.

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Iodine Clock Reaction

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What's the best type of cheese? Whether the results compiled show exactly what was happening when the experiments were being conducted, is another question because there may be some doubt about the accuracy of the results.

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The Iodine Clock Investigation

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Start new discussion Reply. A solution of hydrogen peroxide is mixed with one containing potassium iodide, starch and sodium thiosulfate.

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Lesson organisation This demonstration can be used at secondary level as an introduction to some of the ideas about kinetics.

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Description A solution of hydrogen peroxide is mixed with one containing potassium iodide, starch and sodium thiosulfate. Seven Layer Density Column 2.

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The following, are all the factors that should be considered when investigating the rate of this reaction:

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The following are factors that are to be varied, each independently of each other; throughout this investigation:

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These factors are known as the key variables, and deciding which to vary, and which to keep constant during the experiment becomes very important when it comes to calculating such things as order of reactions and activation energies. I have to carry out this practical very soon and would like to know what to expect.

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As described this is intended as a demonstration, best done on a large scale for the most visual impact. Top 5 Experiments 1.

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Varying the concentration of H2SO4 had no effect on the rate of reaction, as can be seen from the results.

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Follow 3 Make your revision easier Don't miss out on a place at uni - get clearing email alerts Can you help?

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View your post below. When the ways in which temperature affected the rate of reaction was investigated, it was decided to use a thermostatically controlled water bath after modifying the original procedure.

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However, the actual understanding and examination of forensic toxicology only dates back for about years. Original post by Borek Write reaction equations and see what is reacting, what is being produced and what is being consumed.

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Elephant's Toothpaste - Kid Version 3.

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The periodic table involves clok diagram that demonstrates how chemical compounds or elements are associated with one another. For the reaction studied in this investigation, the rate equation is:

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Make your revision easier Don't miss out on a place at uni - get clearing email alerts Can you help? It may help understanding if the students are already familiar with the reactions of starch and iodine, and iodine and chemistry coursework iodine clock reaction thiosulfate, so it may be worth demonstrating these beforehand.

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Results All of the results gained from all courseworo the experiments conducted will now be presented in a series of tables and graphs. Turn on thread page Beta Toggle.

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Varying the concentration of H2SO4 had no effect on the rate of reaction, as can be seen from the results.

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The demonstration itself takes less than 1 minute.

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University of Bradford Replies:

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Therefore, the rate is independent of the concentration.

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Graph 1 holds a number of possible areas where errors may occur and this could explain why the half-life is not constant. These areas of error must therefore be used to explain why the results appeared as they did, making it difficult draw definite conclusions. Make your revision easier Don't miss out on a place at uni - get clearing email alerts Can you help? We are trying to find out the affect of acid concentration on the rate of reaction, we are using 2, 1.

This forum is supported by: I was initially introduced to this particular reaction1 in EP6. Holderness 'Advanced Chemistry' - P. The calculation below shows the activation energy that was calculated from the line giving the average gradient on Graph 7.

Essay on Geological Investigation - Geological investigation is the first step towards the completion of a building and is considered as the most important step as it identifies the feasibility of an area for construction and determines how the foundations and preventive measurements to be set up for the building. The second set of graphs drawn were identical to the first set, but rather than calculating half-lives, they were used to find the gradient at five points along each graph Graphs 2 and 5.

Place two level scoops of Timing Mixture into the first test tube. Reaction 1 oxidation changes all of the I- to I0, but Reaction 2 reduction is faster and changes the I0 right back to I- again, so it has no chance to combine with the starch.

This was conducted in exactly the same way as the H2O2, However, the total volume of KI used was only ever 10ml; the same number of different concentrations were still tested though. In order to gain the required information, trial experiments must be conducted. The relationship being used is known as the Arrhenius equation: Therefore, in the main experiment, a thermostatic water bath will be used that will accurately maintain the temperature of the water, and also be capable of holding a large volume of test tubes at any given time.

Pour onto this approximately cm 3 of boiling water and stir. Advice on everyday issues Replies: A solution of hydrogen peroxide is mixed with one containing potassium iodide , starch and sodium thiosulfate. The basic reaction is: In the case of H2O2 however, the concentration will not be measured in mol dm-3, but in 'Vol. Follow 2 Therefore, if it was required to calculate the concentration of H2O2 in mol dm-3 for the use in an equation for example, this could now be done.

View your post below. Ensure thorough mixing with a stirring rod or magnetic stirrer. Contact with the skin or eyes must also be avoided as it may be slightly corrosive, but more likely it would cause irritation to the skin. Sign in to join this conversation New here? Follow 4 After a few seconds the colourless mixture suddenly turns dark blue.

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