Environmental Chemistry Assignment | Professional Essay Writers

1. One of the following statements is true and the other is false regarding the first-order reaction A +B+C. Identify the true statement and the false one, and explain your reasoning.

a. The rate of the reaction decreases as more of B and C form.

b. The time required for one-half of substance A to react is directly proportional to the quantity of A present.

2. The reaction A+B C D is second order in A and zero order in B. The value of k is 0.0107 M of this reaction when (A) = 0.106 M and (B) = 3.73 M?

3. Fluorine-18 undergoes positron emission with a half-life of 1.10 x 10 minutes. If a patient is given a 248 mg dose for a PET scan, how long will it take for the amount of fluorine-18 to drop to 83 mg? (Assume that none of the fluorine is excreted from the body.)

4. The nuclide As-76 has a half-life of 26.0 hours. If a sample of As-76 weighs 344 g. what mass of As-76 remains after 538 minutes?

5. Determine the half-life of a nuclide that loses 38.0% of its mass in 407 hours.

6. For a reaction that follows the general rate law, Rate = KAJIB) what will happen to the rate of reaction if the concentration of Bis increased by The rate will;

A. increase by a factor of 1/3.

B. increase by a factor of 1/9.

C. increase by a factor of 3.

D. increase by a factor of 9. Get Chemistry help Today