This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: The half-life of cobalt-60 is 5.20 y. How many milligrams of a 1.000-mg sample remain after 6.55 years? (Read 146 times)

fasfsadfdsfa

  • Hero Member
  • *****
  • Posts: 554
on: Jul 8, 2021

Question 1

The half-life of 238U, which decomposes to 206Pb, is 4.51 × 109 y. A rock contains equal masses of these two isotopes. How old is this rock?
◦ 4.07 × 109 y
◦ 4.06 × 109 y
◦ 9.02 × 109 y
◦ 4.51 × 109 y
◦ 5.00 × 109 y

Question 2

The half-life of cobalt-60 is 5.20 y. How many milligrams of a 1.000-mg sample remain after 6.55 years?
◦ 0.418
◦ 1.61 × 10-15
◦ 2.390
◦ 0.794
◦ 0.582
General Chemistry: Principles and Modern Applications ¦ Petrucci, Herring, Madura, Bissonnette ¦ 11th Edition
Buy Test-Bank


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by fasfsadfdsfa on Jul 8, 2021

Li Jun

  • Sr. Member
  • ****
  • Posts: 335
Reply #1 on: Jul 8, 2021
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
Answer Preview
Only 29% of students answer this correctly


fasfsadfdsfa

  • Member
  • Posts: 554
Reply 2 on: Jul 8, 2021
Wow, this really help

cici

  • Member
  • Posts: 325
Reply 3 on: Yesterday
Excellent

« previous next »
 

Did you know?

About 100 new prescription or over-the-counter drugs come into the U.S. market every year.

Did you know?

For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.

Did you know?

Children of people with alcoholism are more inclined to drink alcohol or use hard drugs. In fact, they are 400 times more likely to use hard drugs than those who do not have a family history of alcohol addiction.

Did you know?

Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.

Did you know?

The U.S. Pharmacopeia Medication Errors Reporting Program states that approximately 50% of all medication errors involve insulin.

Life-history cube, a classification of fish, mammals, and altricial birds based on three dimensionle Life-history cube, a classification of fish, mammals, and altricial birds based on three dimensionle
The Dingo was the first placental mammal introduced to Australia, around 4000 years ago The Dingo was the first placental mammal introduced to Australia, around 4000 years ago
Sample Diet for a College-Aged Female Weighing 132 Pounds, Assuming Light to Moderate Daily ... Sample Diet for a College-Aged Female Weighing 132 Pounds, Assuming Light to Moderate Daily ...
Preschool: 3–6 years. Preschool: 3–6 years.
U.S. adults from 25 to 74 years report that the largest proportion of their daily stressors arise ... U.S. adults from 25 to 74 years report that the largest proportion of their daily stressors arise ...
Climate change occurs over millions of years Climate change occurs over millions of years
Video: hGH (protein synthesis, growth and development)

For a complete list of videos, visit our video library