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 117 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
Great answer, keep it coming :)

tuate

  • Member
  • Posts: 332
Reply 3 on: Yesterday
:D TYSM

« previous next »
 

Did you know?

Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.

Did you know?

Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.

Did you know?

The average person is easily confused by the terms pharmaceutics and pharmacology, thinking they are one and the same. Whereas pharmaceutics is the science of preparing and dispensing drugs (otherwise known as the science of pharmacy), pharmacology is the study of medications.

Did you know?

The use of salicylates dates back 2,500 years to Hippocrates’s recommendation of willow bark (from which a salicylate is derived) as an aid to the pains of childbirth. However, overdosage of salicylates can harm body fluids, electrolytes, the CNS, the GI tract, the ears, the lungs, the blood, the liver, and the kidneys and cause coma or death.

Did you know?

Green tea is able to stop the scent of garlic or onion from causing bad breath.

Part of the Hubble Ultra-Deep Field image showing a typical section of space containing galaxies int Part of the Hubble Ultra-Deep Field image showing a typical section of space containing galaxies int
Grace Ndiritu, Still Life: White Textiles. Grace Ndiritu, Still Life: White Textiles.
Review Cognitive Changes over the Adult Years Review Cognitive Changes over the Adult Years
Poverty rates have declined in the last 50 years, and the biggest decline has been for people 65 and ... Poverty rates have declined in the last 50 years, and the biggest decline has been for people 65 and ...
The second half of life brings a change from outward to inward concerns and from physical to ... The second half of life brings a change from outward to inward concerns and from physical to ...
Historical Life Expectancy Historical Life Expectancy
Video: Major Elements in Biological Molecules: Lipids

For a complete list of videos, visit our video library