The equation obtained could now be used to find Ea. It may also supply basic knowledge about the processes and chemical reactions happening inside our body. Risk Assessment Before I can start conducting the main experiment, the issue of laboratory safety must be considered so that any possible exposure to risk is avoided. According to Sadhi 2012 , one-third of the construction projects are delayed and half of over-tender cost on road projects are due to inadequate geological investigation or poor interpretation of the data. Therefore, ionic substances that will not react with the other substances must be added to have a consistent concentration of the ions and the charges. Run 2 Temperature, K Rate constant, M-1s-1 Set 1 301 0.
For this aim 3 sets of results will be obtained by timing how long it takes for the colour change to occur in different temperatures determined by the use of an electric water bath. However, in order to consider the possible errors that I may have made, I also drew two more lines on the same graph giving the values of the maximum and minimum gradients. To learn how to use the Science Journal app and how to use the light sensor, you can review the relevant tutorials on this. Potassium persulfate is less soluble cfr. In this project, you will use the app to record the color change of your reaction. With these results, the effect of temperature on the rate of reaction will be investigated.
On the first part, 2 beakers with different contents were prepared. In some variations, the solution will repeatedly cycle from colorless to blue and back to colorless, until the reagents are depleted. To find out which catalyst is most effective, this aim will be carried out as an iodine clock reaction. Therefore a modification that might be made could be to perhaps use a more sophisticated and reliable water bath. Moreover, enough energy must also be available in order to break the chemical bonds and the minimum amount of energy required to react is termed as the activation energy, Ea.
If you have a great idea or a science question send us an email. More collision frequency would cause the reaction to speed up The last part of the experiment was finding the effect of a catalyst in the reaction rate. If you have a very bright ceiling lamp, that might work as well. The trick, of course, is knowing when the fixed amount of product has been formed. The time was recorded afterwards. According to Ferrer Geological Consulting n.
The experiment was able to determine the effects of the factors on the rate of reaction. Hmmm… I can certainly understand your problem. The table below shows the results of the calculation made. This may be achieved in a number of ways: 1. Results of the experiment indicated that the rate is first order with respect to each reactant and that the activation energy is high implying sensitivity to temperature. Introduction: The purpose of the following experiment was to gain a greater understanding of how chemical reactions occur, by observing how concentrations, along with temperature influence the rate of a reaction, the reaction rate constant, and the activation energy. The concentration of the substances especially the reactant ions and thiocyanate could change the rate of reaction.
Thus, the percent error for the order of reaction with regards to the iodate is 3. Therefore there may have been some variation in actually deciding the end point of the reaction, which may have lead to errors and inaccuracies in the results. In order to increase the rate at which reactions occur, the frequency at which reacting molecules collide must be increased. Decreasing the pH increasing H + concentration , or increasing the concentration of iodide or hydrogen peroxide will shorten the time. In order to gain the required information, trial experiments must be conducted.
Determine the effects of the presence of ethanol on the rate equation. Practical Chemistry activities accompany and. This graph is visibly much 'deeper' than a graph showing a first order reaction. What does this graph show? After a short time delay, the liquid suddenly turns to a shade of dark blue due to the formation of a. } Crime Scene Evidence b. In the case of solids, by reducing particle size and thus increasing the effective surface area.
Errors obtained may be caused by the preparation of the reagents. First, second, and third parts of the experiment were used to examine the effects of the reactant concentrations, temperature and the presence of catalyst to the rate of reaction, respectively. It was helpful in predicting the value of the dependent variable using independent variable. From this a final set of graphs were drawn showing the rate of reaction against concentration Graphs 3 and 6. Results All of the results gained from all of the experiments conducted will now be presented in a series of tables and graphs. I2 reacted with the starch as fast as it was produced. Berichte der Deutschen Chemischen Gesellschaft in German.