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The Rate of Reaction

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Investigating the The Rate of Reaction Background: A reaction is where two or more atoms collide with each other. These atoms are different substances, when they react with each other they then change to a different substance. The rates of the reaction and how fast they change depends on a number of things, these are: > Surface Area - Surface area is a measure of how much surface is exposed. We find that small pieces of solids, especially powers, react faster than large pieces. As we increase the surface area, we increase the rate of reaction. > Concentration - The acid particles can only react with the marble chips when they collide. As you increase the concentration of the acid, there are more acid particles in the same volume. Therefore, there is a greater chance of acid particles colliding and reacting, with the particles on the surface on the marble. As we increase the concentration, the rate of reaction increases. > Temperature - When you heat the particles, the particles have more energy and move around more quickly. As they travel faster there are more collisions in a certain time. ...read more.


If the volumes are not the same the results that we will obtain might turn out to be anomalous results. Also if we accidentally use less solution in the beaker, it will also affect the results in a way as the reaction would be quicker. > Thermometer Readings - The thermometer readings all need to be accurate and the temperature of the flask should be the same. The temperature has to be the same otherwise the results would vary and we might get unexpected results. The results need to be accurate to allow us to correctly measure the rates of the reactions. > Repetition - The experiment should be followed out at least twice to ensure we get accurate and fair results. By repeating the experiment twice we can calculate an average of the results and see if there are any patterns or anomalous readings in our results. By using an average, we could make other judgments about how good or bad the experiment went. Preliminary Work Preliminary work was carried out before the experiment to determine the quantities and measurements that will be used for the final experiment. ...read more.


..."The rate of reactions should increase when the temperature increases. This is due to a theory called the collision theory. A reaction can only occur when the particles collide. A chemical change can only take place with a fixed amount of collisions by the particles. These are often referred as successful collisions. The successful collisions have a sufficient amount of energy at the moment of impact, causing existing bonds to break to form new bonds. By raising the temperature, more collisions would happen because the particles would move faster and therefore more successful collisions, which will increase the rate of reaction."... ...was proven correctly by the results I can see this as the results decreased the temperature rises. I can also conclude to say that this all occurs as the activity of the particles has increased meaning that more collisions took place making the rate of the reaction faster. This can again be seen in the results, which were obtained from the experiment. The graph also back up my prediction and the collision theory also backs it up. For something to react with something else, the particles must collide first. This is true whether both particles are in solution or whether they are different from each other. If the temperature is higher, the chances of collision are greater. Matthew Patrick ...read more.

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