Rates of Reaction :: GCSE Chemistry Coursework Investigation

The cast of reception is a measure of how fast something happens. We can find the rate of answer by measuring the qualifying that happens in a set period of time.Introduction------------The rate of reaction is a measure of how fast something happens. Wecan find the rate of reaction by measuring the change that happens ina set period of time. M any(prenominal) factors can affect the rate of reactionthe concentration of the reactants is one of them. In the following samples we will go over how the concentration of the reactantsaffect the rate of reaction. To do this we will use the reactionbetween magnesium and hydrochloric acid. GRAPHI will measure the rate of reaction by timing how long the reactiontakes.Aim- I am trying to find out how an increase/decrease in concentrationof the acid affects the rate of reaction in magnesium strips.PredictionI predict that as the concentration of hydrochloric acid increases thetime taken for the magnesium to disso lve will decrease. I also thinkthat when the concentration of the acid doubles the rate of reactionwill also double.Collision TheoryThe collision theory is how the rate of reaction increases when theconcentration of hydrochloric acid increases.In the reaction firstly all of the particles in the reactingsubstances must collide. They must collide with a certain amount ofenergy called energizing energy, this must be reached for the reactionto take place. If the particles do not reach this required amount ofenergy there will not be any successful collisions and therefore thereaction will not take place. If the particles do reach the requiredamount of energy a reaction will stemma place and as the number ofcollisions increase the reaction speeds up.The more concentrated the reactants the larger the number ofsuccessful collisions between the particles. This explains why thelargest rate of reaction is usually as soon as the reactants have beenmixed together, this means they are both at t heir highestconcentrations.High concentration Low concentration(18cm HCL + 2cm HO) (6cm HCL + 14cm HO)The temperature in this investigation will not affect the rate ofreaction because throughout the investigation it will stay at roomtemperature. If the temperature was to change during the experiment itwould effect the rate of reaction by speeding it up if the temperatureincreased because the particles move a lot faster and travel a larger