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

Author Question: A certain radioactive element has a half-life of one hour. If you start with a 1-g sample of the ... (Read 83 times)

jace

  • Hero Member
  • *****
  • Posts: 541
on: Aug 27, 2018
A certain radioactive element has a half-life of one hour. If you start with a 1-g sample of the element at noon, how much of this same element will be left at 3:00 PM?
 
  A) 0.5 gram
  B) 0.25 gram
  C) 0.125 gram
  D) 0.0625 gram

Question 2

A sample of iron weighs more after it rusts because ________.
 
  A) it has expanded into a greater volume
  B) rust contains twice as many iron atoms
  C) of the additional oxygen it contains
  D) Wrong. Iron actually weighs less after it rusts


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

Kdiggy

  • Sr. Member
  • ****
  • Posts: 340
Reply #1 on: Aug 27, 2018
Answer to Question 1

C

Answer to Question 2

C


jace

  • Hero Member
  • *****
  • Posts: 541
Reply #2 on: Aug 27, 2018
Both answers were spot on, thank you once again


Kdiggy

  • Sr. Member
  • ****
  • Posts: 340
Reply #3 on: Aug 27, 2018
Great! Please up vote :D


« previous next »
 

Did you know?

The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.

Did you know?

About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.

Did you know?

Human kidneys will clean about 1 million gallons of blood in an average lifetime.

Did you know?

Carbamazepine can interfere with the results of home pregnancy tests. If you are taking carbamazepine, do not try to test for pregnancy at home.

Did you know?

Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.

Classification of life histories based on juvenile survival, fecundity, and age at reproductive matu Classification of life histories based on juvenile survival, fecundity, and age at reproductive matu
Ascomycetes Life Cycle Ascomycetes Life Cycle
beaty of life beaty of life
(a) Uranium series dating uses the decay chain of radioactive uranium to stable lead. (a) Uranium series dating uses the decay chain of radioactive uranium to stable lead.
On May 15, 1916, after deliberating for one hour, an all-white jury in Waco, Texas, found seventeen- On May 15, 1916, after deliberating for one hour, an all-white jury in Waco, Texas, found seventeen-
Life of a Midlatitude Cyclone Life of a Midlatitude Cyclone
Video: Buffers definition and the role of buffer in the body

For a complete list of videos, visit our video library