When is the initial rate of reaction?
right at the start of the reaction
How do you set up a concentration-time graph?
Set up a reaction and then monitoring the amount of a reactant or product over time then plotting time along the x axis and the reactant on the y axis
How do you calculate an initial rate of reaction from a concentration-time graph?
Draw a tangent at time = 0
Calculate the initial rate by doing rise / run (or y/x)