Conceptual Question on Kinetics: Which one of the following is true for a reacti

Question

Conceptual Question on Kinetics:
Which one of the following is true for a reaction that has only one reactant? (Please explain why.)
B) (see picture below) Which statement is true of the following graphs? Why? Which reaction has K=1? Explain why.
7. Which one of the following is true for a reaction that has only one reactant? (1pt) A) If the reaction is first order, then ti/2 will double as the initial concentration of the reactant doubles. B) If the reaction is zero order, then ti2 will double as the initial concentration of the reactant C) If the reaction is second order, then t/2 will double as the initial concentration of the reactar D) If the reaction is second order, then ty2 will double as the initial concentration of the reacta E) Both B and D doubles. doubles. is reduced to half

Explanation / Answer

for zero order reactions

t1/2 = [Ao] / 2k

for first order reactions

t1/2 = ln2 / k

for second order reactions

t1/2 = 1 / k[Ao]

so

for first order , not dependent on initial concentration

for zero order , t1/2 will double as initial conc doubles

for second order, t1/2 will double as initial conc is halved

so

answer is E) both B and D

1) for the reaction to be favorable

reactants should have higher energy

so

reaction 1 is favorable

reaction 4 is spontaneous

so

the answer is   E) Both A and C

2) for a reaction to have K=1

the energies of reactants and products should be same

so

reaction 3 has K=1

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