I'm doing this bit of work on rates of reactions using the iodine clock with potassium peroxodisulphate and potassium iodide. I've got loads of times for the reaction to change. Am I right in thinking that if I plot 1/time against concentration then if I get a straight line I will know that the reaction is first order for that reaction? What if it isn't a straight line? Can anyone give me any guidance on bringing temperature into it?