To investigate and find out if concentration affects the rate of reaction. The equation for my experiment is: CaCO3 + 2HCl CaCl2 + H2O + CO2
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Chemistry Coursework Planning The rate of a reaction is defined as the speed at which the reaction takes place. Many things can affect the rate of reaction. Concentration is how much the acid particles are colliding between the water molecules. If there is more water, there are less of the reactant particles knocking against the water, making the solution more dilute. Collision theory - Collisions between reactant particles are needed for the reaction to take place in order to form a product. Some collisions are successful and give a product while others don't because particles don't have enough energy. Activation energy - The amount of energy needed for the reaction to be started. If there is enough energy then the reaction takes place and a product is formed, but if there isn't enough then no reaction takes place. There are two possibilities for increasing the rate of reaction: ...

