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 120 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?

When intravenous medications are involved in adverse drug events, their harmful effects may occur more rapidly, and be more severe than errors with oral medications. This is due to the direct administration into the bloodstream.

Did you know?

Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

Did you know?

The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.

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?

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.

Diagram of the life cycle of Plasmodium falciparum, the causative agent of malaria Diagram of the life cycle of Plasmodium falciparum, the causative agent of malaria
The Scale of Life 1 The Scale of Life 1
A consensus tree of life A consensus tree of life
Life cycle of norepinephrine (NE): (1) NE is synthesized from the amino acid tyrosine; (2) NE is ... Life cycle of norepinephrine (NE): (1) NE is synthesized from the amino acid tyrosine; (2) NE is ...
U.S. Subsurface Coal Mining: Output, Price, and Output per Worker-Hour, 1949–1994 U.S. Subsurface Coal Mining: Output, Price, and Output per Worker-Hour, 1949–1994
Graph Liters per Hour Graph Liters per Hour
Video: Ventilation - phases and driving forces

For a complete list of videos, visit our video library