PLS HELP $1-5$ POSTLAB QUESTIONS

$1.$ From your results in Part A$,$ can a prediction be made about the nature of the rate$-$controlling step in this reaction? If not, why not? If so$,$ give a plausible chemical equation of this step $($Hint: Think about the connection between the molecularity of the rate$-$controlling step and the order of the overall reaction$).$

$2.$ From your results in Part A$,$ calculate the time for the blue color to appear for this system if $1\mathrm{.}5$ mL KI$,1\mathrm{.}5$ mL KCl$,1\mathrm{.}0$ mL $($NH$4)2$S$2$O$8,$ and $1\mathrm{.}0$ mL Na$2$S$2$O$3$ from Table $1$ are mixed. $3.$ Using your linear plot In $100/$Delta T vs$.(1/$T$)$ in Part B$,$ measure the experimental slope and use it to calculate the activation energy, EA$,$ in units of kJ$/$mol$.$

$4.$ Use your data from Part B and the Arrhenius equation to calculate the value of EA for this reaction. How does this value compare with the obtained value in number $4($the slope from the graph$)?$ Which do you think is more accurate and why? Note: we used relative rate for k$.$ In k$2/$k$1=$Ea$/$R $($T$2-$T$1/$T$2$T$1).$ Does your data agree with the postulate that the reaction rate will double for a $10$oC rise in temperature? Support your answer with a calculation.