Question

Please I need help with questions number #3 , #4 , and #5

Rate of Reaction Prelaboratory Assignment 1. In a graph of the concentration of a reactant vs. time, what parameter gives the rate? 2. Write Beer's Law as an equation. Show how absorbance can be used to monitor concentration. A rate equation could be written as (Ac/At)--k [c]". Define (name) the following as they pertain to the rate equation: a) (Ac/At) b) k c) [c] 4. Assume n in #3 is not zero. a) Does (Ac/At) change or remain constant as a reaction progresses in time? b) Does k change or remain constant as a reaction progresses? 5. Why can we use absorbance in place of [c in this experiment?

Answer 1

Dc/Dt= This is rate of chemical reaction which is equal to the
change in concentration of any of the reactants or products
per unit time

b) K- It is the rate constant for a reaction which is equal
to the rate of reaction when concentrations of each of the reactant is unity

c) [c] = it is the concentration of reactant
d) n= it is order of reaction with respect to the reactant.
when n=1 it is first order reaction,n=2 it is a 2nd order reaction

4) a) Rate Dc/Dt will change as the reaction progress
b) Rate constant remains constant for a particular reaction
at a particular temperature.
5) Beer's law says that absorbance is directly proportional
to concentration.Using this concept we can use absorbance in place of concentration [c]

Thank you :))