Investigating The Affect of Concentration on The Rate of Reaction :: GCSE Chemistry Coursework Investigation

Investigating The Affect of Concentration on The Rate of Reaction Aim- To find out if changing the concentration of the hydrochloric acid affects the volume of gas released in 5 minutes. Background Information The rate of reaction depends on four things:- 1. Temperature 2. Concentration 3. Catalyst 4. Size of particles/surface area The Collision Theory The collision theory explains the rates of reaction, the rate of reaction depends on how often and how hard the reacting particles collide with each other. The basic theory is that particles have to collide with each other in order to react, but it is not that simple, as it also depends on how hard the particles collide. If the particles do not collide hard enough then they will not react, they will simply just hit each other and 'bounce' off. This means that even if I am not investigating the rate of reaction when the temperature is changed, it will still have a big part to play in my experiment. If the temperature is different in the classroom when I do each concentration of acid it may have a huge impact on my results. To help keep my results as accurate as possible I could take the temperature of the room before I do each experiment. If the temperature in the room is below 20 C the particles will still be moving, but very slowly. This would cause the react to be very slow. At temperatures above 20 C the particles will be moving at a regular speed. Low Concentration High Concentration Activation Energy Activation energy is the energy needed to start a reaction. Each molecule has a certain amount of energy, when molecules collide they have to collide with more energy than they already have in order to react this is called a successful collision. If the molecules collide but do not create enough energy this is an unsuccessful collision and the molecules do not react. I am going to focus on the concentration. If the concentration of the hydrochloric acid is increased, then so will the number of collisions. If the acid is more concentrated it means that there will be more particles in the same size space compared to a diluted acid, this means collisions will be more likely and more frequent as the particles are closed together. Apparatus I Will Need:-  · Conicle flask  · Glass syringe  · Bung  · Delivery tube  · Marble chips(5 grams)  · Hydrochloric acid(50 cm )  · Stop clock Other Apparatus that I May Need:-  · Stand (to hold up gas syringe)  · Thermometer (to take the temperature of the room before do each concentration.)  · Weighing scales (to weigh out marble chips). Method I am going to change the concentration of the hydrochloric acid to