Rate of reaction: The change in concentration of any of the reactants or products with unit time.
Rate of reaction is measured in the units moldm-3s-1
The gradient about a tangent on a reaction rate graphs shows the reaction rate at that specific time. This is also to the units moldm-3s-1. The larger the gradient, the bigger the rate of reaction at the particular instance. For example, in a reaction rate graph of a reactant, the graph would start of with a steep gradient at zero. This is because at the beginning of a reaction, there is a high concentration of reactant, increaing the rate of reation, as there are more particles to make sucessful collisions and exceed the activation energy.
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