How do you work out the inital rate of reaction from looking at graphs?

Ulex says I am assuming you are looking at a graph of reactant concentration plotted against time. The graph will be a curve going down to the right. The initial rate of the reaction is the gradient of this curve at its top right-hand end (i.e.

When time =0). Draw a tangent to the graph at this point and find the gradient of it. This, ignoring the minus sign, is the initial rate of the reaction.

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