Different Variables Changing the Rate of Reaction :: Reaction Rates Science Gases Essays

Different Variables Changing the Rate of Reaction To show that different variables can change the rate of reactions e.g. make them faster or slower. Theory: - That changing the variables in a reaction such as concentration, temperature and surface area will increase or decrease the rate of reaction. This would happen because, if you changed the concentration of a solution to a higher concentration the rate of reaction would increases, as there are more particles in the solution which means the particles would collide more. As they are colliding more, particles collide with the other substance making the reaction time much farter and greater. Low Concentration = Slower Reaction High Concentration = Faster Reaction Less Particles More Particles Equipment:- Chronicle Flask Measuring Cylinder Gas syringe Beaker Calcium Carbonate Stopwatch Pestle and Mortar Boss and Clamp Hydrochloric Acid Clamp stand But and Tube Measuring Scales Safety: - As acid and Bunsen's may be being used safety goggles should be worn at all times and all hair tied back. As glass is being used all bags should not be in the corridor and all should be careful when handling glass in case of breakage. All science classroom safety rules should be followed to ensure a safe environment. Prediction: - In our experiment we shall be changing the concentration of the solution, making the solution weaker and stronger. I predict that when the solution has been weakened by water to make it less concentrated the rate of reaction will be slower and weaker. This will happen as there are less particles of hydrochloric acid reacting with the calcium carbonate, the fewer amounts of particles the less amount collisions with the calcium carbonate. Therefore when the hydrochloric acid is strengthened by doubling the amount of hydrochloric acid and adding it with the same amount of calcium carbonate the reaction will be stronger and quicker. This will occur as there are more particles in the solution reacting with the calcium carbonate, as there are more particles in the solution the number in collisions will greatly quickening the reaction time. Method: - After all equipment has been collected and set up (e.g. clamp stand), and all safety rules are followed. First weigh the amount of calcium carbonate you will use i.e. 4g. Then decide if you will change the surface area, doing this will quicken or slow down the experiment. To change the surface area put your calcium carbonate in a pestle and mortar and grind down the chips into a powder, small chips or leave it in the size given. After you have decide and carried out this put the calcium carbonate into the chronicle flask. Then decide if you will change the concentration of the hydrochloric acid, to