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Year 11 Chemistry Coursework:- Investigating Reaction Rates I am investigating the reaction between an acid, and a substance. The acid is Hydrochloric acid, and the substance that will be reacting with it is Calcium Carbonate. Before I begin to explain what I will be investigating and why, I must explain how rates of reactions change, under different situations. Rates Of Reaction A higher concentration of acid in an experiment will increase the rate of reaction. This is because there are more particles of acid in a higher concentration, so the particles can collide more frequently with the Calcium Carbonate. There is an increased chance of the particles reacting, as more collisions occur. Therefore, if the concentration of acid is higher (there is more acid, and less water in the solution), there will be more collisions between the acid particles and the Calcium Carbonate particles, so therefore more reactions. Below are diagrams explaining...

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