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CHM Kenetics

1-A student performs a kinetics experiment in which they measure the time it takes for a reaction to proceed using a color change for indication. They vary concentrations of one reactant to determine the order of the reaction relative to that reactant. They compare their measured reaction rates to their classmates and discover that their reaction rates are lower than all of their classmates. Which of the following is the most likely reason for the low reaction rates? Choose from:

The concentration of reactant was too high.
The student was too fast in stopping their timer.
The temperature was too high.
The student was too slow in stopping their timer.
The student used a catalyst.

2-A student carries out a kinetics experiment by determining initial rates of reaction at varying concentrations of one reactant (reactant A), while holding the concentration of the other reactant (reactant B) constant. The student later discovers that their calculated rate constant is incorrect, but the reaction order with respect to A is correct. Which of the following is the most likely reason for the incorrect rate constant? Choose from:

The concentration of reactant B was consistently miscalculated, but the concentrations of A were correctly calculated.
The concentrations of reactant A were consistently miscalculated, but the concentration of B was correctly calculated.
The concentration of reactant B was inconsistently miscalculated, but the concentrations of A were correctly calculated.
The concentrations of reactant A were inconsistently miscalculated, but the concentration of B was correctly calculated.
There is no plausible reason for the rate constant to be incorrect if the reaction order with respect to A is correct.

3-What would be the effect of performing your kinetics experiments at a lower temperature than the one you used? Choose from

The reaction rate would increase and the order of the reaction with respect to each reactant would increase
The reaction rate would increase and the order of the reaction with respect to each reactant would remain the same
The reaction rate would decrease and the order of the reaction with respect to each reactant would decrease
The reaction rate would decrease and the order of the reaction with respect to each reactant would remain the same Temperature will not affect the rate of reaction or reaction order

4-A student carries out a kinetics experiment and discovers that the reaction rate is independent of the concentration of reactant. What is the order of the reaction? Choose from:

Zero order
1/2 order
1st order
2nd order
3rd order

Solution Preview

1-A student performs a kinetics experiment in which they measure the time it takes for a reaction to proceed using a color change for indication. They vary concentrations of one reactant to determine the order of the reaction relative to that reactant. They compare their measured reaction rates to their classmates and discover that their reaction rates are lower than all of their classmates. Which of the following is the most likely reason for the low reaction rates? Choose from:

The concentration of reactant was too high.
The student was too fast in stopping their timer.
The temperature was too high.
The student was too slow in stopping their timer.
The student used a catalyst.
The rate is low and one possible reason is the student was too ...

Solution Summary

The concentration of reactant being high is provided. Which is most likely the reason for a low reaction rate is determined.

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