posted by .

8. The half-life of a reaction was found to be inversely dependent on the concentration of the starting material. Thus, we can say that

a. the reaction is zero order b.the reaction is first order
c.the reaction is second order

d. the reaction starts out first order and changes to second order after one half-life.

e. the reaction starts out second order and changes to first order after one half-life.

I think that the answer is the reaction is second order. Is this correct?

Here are the equations for half life for
order 0, order 1, and order 2. I didn't include order 3 because those reactions are not very common.
zero order:
half life = (Ao)/2ak

1st order:
half life = ln 2/ak

2nd order:
half life = 1/ak(Ao)

note: a and k are constants.l (Ao) is starting material concn.

You are right; it is second order. That is the only one for which the starting material is inversely dependent on the starting material, (Ao).

## Similar Questions

1. ### Chemistry

The reaction 2B--->C + 2D is found to be zero order when run at 990 degrees C. If it takes 3.3X110^2 s for an initial concentration of B to go from 0.50 M to .20 M what is the rate constant for the reaction?

The reaction of CO(g) + NO(g) is second-order in NO2 and zero-order in CO at temperatures less than 500K. (a) Write the rate law for the reaction. (b) How will the reaction rate change if the NO2 concentration is halved?
3. ### chemistry

The half-life of a reaction was found to be inversely dependent on the concentration of the starting material. Thus, we can say that a. the reaction is zero order b. the reaction is first order c. the reaction is second order d. the …
4. ### chemistry

The half-life of a reaction was found to be inversely dependent on the concentration of the starting material. Thus, we can say that a. the reaction is zero order b. the reaction is first order c. the reaction is second order d. the …
5. ### chemistry

The half-life of a reaction was found to be inversely dependent on the concentration of the starting material. Thus, we can say that a. the reaction is zero order b. the reaction is first order c. the reaction is second order d. the …
6. ### Chemistry

a certain first order decomposition reaction has a half-life of 15.0 minutes. What is the rate constant for this reaction?
7. ### Chemistry

Calculate the half-life (in s) of a first-order reaction if the concentration of the reactant is 0.0655 M 18.4 s after the reaction starts and is 0.0173 M 41.2 s after the reaction starts. I got 25.6 Suppose the half-life is 23.7 s …
8. ### Chemistry

In a given 1st order reaction A ---> products, the initial concentration of A is 0.40 M. What will be the concentration of A after 15 seconds if the half-life of the reaction is 3 seconds?
9. ### Chemistry

For the reaction 2 NO (g) + Cl2 (g) → 2 NOCl (g) If the concentration of NO is tripled, the rate of the reaction increases by a factor of nine. If the concentration of Cl2 is cut in half, the rate of the reaction is decreased …
10. ### chemistry

The rate of a reaction A + 2B --> products is determined. When the concentration of A is 1.0 M, the rate of the reaction is 0.50 M/s. When the concentration of A is 0.50 M, the rate is 0.25 M/s. From this data, you can determine: …

More Similar Questions