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An introduction to rates of a reaction.

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Introduction

Science Coursework Rates of resistance Plan An introduction to rates of a reaction. What does the rate of a reaction mean? The RATE of a reaction is the SPEED at which a reaction happens. If a reaction has a low rate that means the molecules combine at a slower speed than a reaction with a high rate. Some reactions take hundreds, maybe even thousands of years while other can happen in less than one second. The rate of reaction depends on the type of molecules which are combining. There is another big idea with rates of reaction... COLLISION THEORY. Reaction Mechanism Most reactions occur in a series of steps. Each step normally involves the collision of only two particles. There is little chance of three or more particles colliding with the proper position and sufficient energy to cause a reaction. If a reaction consists of several steps, one of the steps will be slower than all the others. This step is called the rate determining step. The other faster steps will not affect the rate of the reaction. The series of steps that must occur for a reaction to go to completion is called the reaction mechanism. ...read more.

Middle

burner * Heat proof mat * Gauze * goggles Stacey Owen Candidate no: 0126 Hampton Community College Safety A pair of goggles will be worn during the heating part of the experiment in order to protect the eyes. A gauze and heatproof will be used which heating to avoid any damage to the equipment. Prediction: I predict that as the temperature is increased, the rate of a reaction increases. Also as the concentration increases, the rate of a reaction increases. The collision theory explains this: When the temperature is increased the particles will have more energy and thus move faster. Therefore they will collide more often and with more energy. Particles with more energy are more likely to overcome the activation barrier to reaction and thus react successfully. If solutions of reacting particles are made more concentrated then there are more particles per unit volume. Collisions between reacting particles are therefore more likely to occur. From the information above, I can predict that. Here is my predicted graph: [image002.jpg] Stacey Owen Candidate no: 0126 Hampton Community College Science Coursework Rates of reaction Results I recorded the results and then put them into a table. ...read more.

Conclusion

My results show quite definitely that as increases the increases. I'm happy with the accuracy of my results for two reasons: 1. The results follow my prediction closely. 2. All the points are close to the line of best fit. I could have made my experiment more accurate, if I had taken more sets of readings, I would have obtained a better average. I'm pretty pleased with the suitability of my experiment for the following reasons. 1. I was able to get to good and valid sets of results using the equipment and time allowed. 2. I made the test as fair as possible. There was a few anomalous result but the lines of best fit followed the correct pattern and my prediction. These anomalous results may have been because it was hard to get the exact temperature, to know exactly when the cross had disappeared and to get the right measurement of acid, water and St. Therefore I'm happy that my evidence is accurate and reliable enough to support my conclusion. To Improve and extend this investigation I could use the same method to investigate a greater range of input variables e.g. * Different temperature * Different concentrations * Different liquids * I could have used a catalysts * Different particle sizes Stacey Owen Candidate no: 0126 Hampton Community College ...read more.

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