Chemistry Practice Problems Identifying Reaction Order Practice Problems Solution: A sample of Th-219 requires 3.84x10 –6 seconds to ...

# Solution: A sample of Th-219 requires 3.84x10 –6 seconds to decay to 1.50 mg. What was the initial mass of the sample? The half-life for Th-219 is 1.05x10 –6 seconds. A. 3.0mg B. 5.9mg C. 18.9mg D. 37.8mg E. 56.1mg

###### Problem

A sample of Th-219 requires 3.84x10 –6 seconds to decay to 1.50 mg. What was the initial mass of the sample? The half-life for Th-219 is 1.05x10 –6 seconds.

A. 3.0mg

B. 5.9mg

C. 18.9mg

D. 37.8mg

E. 56.1mg

Identifying Reaction Order

Identifying Reaction Order

#### Q. Below is a plot of an integrated rate law vs. time. Which of the following could be the correct label for the y-axis? (Circle one)

Solved • Thu Mar 17 2016 10:12:28 GMT-0400 (EDT)

Identifying Reaction Order

#### Q. A radioactive sample contains 1.55 g of an isotope with a half-life of 3.8 days. What mass of the isotope remains after 5.5 days? A. 0.57g B. 1.02g ...

Solved • Wed Mar 16 2016 18:49:16 GMT-0400 (EDT)

Identifying Reaction Order

#### Q. How long will it take for 80% of a 1.20mg sample of Rn-220 to decay? The half-life of Rn-220 is 55.6 seconds. A. 17.9 seconds B. 55.6 seconds C. 11...

Solved • Wed Mar 16 2016 18:45:40 GMT-0400 (EDT)

Identifying Reaction Order

#### Q. How many mg of a 3.50mg sample of Tc-99 will remain after 4 half-lives have passed? A. 0.055mg B. 0.109mg C. 0.219mg D. 0.438mg E. 0.875 mg

Solved • Wed Mar 16 2016 18:22:13 GMT-0400 (EDT)