If a large amount of heat was released at the start of the reaction, what effect
ID: 1637375 • Letter: I
Question
If a large amount of heat was released at the start of the reaction, what effect would this have on the rate measurements?
Determine the value of q from the graph. Explain your answer.
a b c d e f g h i Trial t [I3-] / t (M/s) log([I3-] / t) V 0.2 M KI added (mL) [I–]0(M) log[I–]0 V of 0.2 M (NH4)S2O8 (mL) [S2O8]0 (M) log[S2O8]0 1 19 .0116 -1.94 25 .077 -1.11 25 .077 -1.11 2 40 .0058 -2.24 25 .077 -1.11 12.5 .038 -1.42 3 85 .0144 -1.84 25 .077 -1.11 6.25 0.19 -1.72 4 41 .0055 -1.25 12.5 .038 -1.42 25 .077 -1.11 (Explanation / Answer
The rate of the reaction and rate constant of the reaction both are dependent on temperature. Hence, for the rate measurement of a reaction it is recommended an isolated system and record the teperature of the reaction system. If a large amount of heat was released at the initial stage of the reaction then rate constant for the reaction increases and it favours the reaction to proceed faster as the reactant molecules acquire this heat energy to collide and this results in more product. Hence, initially rate of the reaction increases drastically. But at the later stage, when the heat released is not at that extent then the rate of the reaction proceeds at the lower rate.
However, if the reaction is exothermic, then the backward reaction may be favoured but at the initial stage concentration of reactant molecules are large and they require energy to initiate the reaction so, overall rate of reaction increases.
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.