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Yes, the straight line is a best fit line to the data. When trying to determine the order of a reaction from the data, you need to plot the data and see what operation you need to do to make the best fit curve be a straight line instead of an exponential decay or other nonlinear graph. For example, if plotting the experimental data on a ln[A] vs time graph gives a straight best fit line, then the reaction is first order. If plotting the data on a 1/[A] vs time graph gives a straight line, then the reaction is second order. You may need to plot it multiple times to find the correct one. I hope this helps!
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