The Affect of Changing the Concentration on the Rate of Reaction :: Collision Theory Reaction Rates Essays

The Affect of Changing the Concentration on the Rate of Reaction To find out the affect of changing the concentration on the rate of reaction Scientific background Collision theory: Collision theory explains how chemical reactions occur and why rates of reaction differ. For a reaction to occur, particles must collide. If the collision causes a chemical change it is referred to as a fruitful collision and it's a Theory that explains how chemical reactions take place and why rates of reaction change? For a reaction to occur the reactant particles must collide. Only a certain fraction of the total collisions cause chemical change these are called fruitful collisions. The fruitful collisions have enough energy (activation energy) at the moment of impact to break the existing bonds and form new bonds, resulting in the products of the reaction. Increasing the concentration of the reactants and raising the temperature bring about more collisions and therefore more fruitful collisions, increasing the rate of reaction. Rate of reaction: amount of a substance that takes part in a chemical reaction in a given time, and its also Finding out how quickly reactions take place and understanding why they happen at the rate they did. Molecules: Molecules are compounds made up of atoms. Movement: is how the reaction occurs Activation Energy: the minimum energy in the reaction. Prediction: What I predict to happen in my experiment is that when I add 10 cm3 of Hydrochloric acid into the flask with the sodium Thiosulphate of 50cm3 then I hypothesise that the cross will disappear a lot faster than when I add less amount of Hydrochloric acid. Hypothesis: I predict is that when I use high concentration of Na2S2o3 the rate of reaction would be very fast and the cross is going to disappear more rapidly and when the solution is more diluted by adding more (water) so the reaction will slow down much slower and it will take more time for the cross to disappear. I think this will happen because by adding more water in it will produce more particles in the concentrated solution so because of this there will be more collisions and it will slow down the reaction. Apparatus: In order to do any type of experiment, you need equipment. The equipment I will use is: Measuring Cylinder Small measuring cylinder Flask 2 beakers Paper marked with a big cross in the middle. Stops watch (Timer). Method: - Firstly we got the equipments listed above - Then we set it up the equipment as shown above. - We got a piece of paper and drew a big cross on it. - Then using a conical flask and 100ml beakers and a 250ml beaker we