1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Salsk061 [2.6K]
3 years ago
12

An isotope has a half-life of 10 minutes. after 20 minutes, what percentage of the original nuclei remain?

Chemistry
1 answer:
Elena-2011 [213]3 years ago
6 0
To solve this, we can use two equations.
t1/2 = ln 2 / λ = 0.693 / λ  
   
where, t1/2 is half-life and λ is the decay constant.

t1/2 = 10 min = 0.693 / λ

Hence, λ = 0.693 / 10 min              -         (1)

Nt = Nο e∧(-λt)    
                
Nt = amount of atoms at t =t time
Nο= initial amount of atoms
t = time taken

by rearranging the equation,
Nt/Nο = e∧(-λt)                  -  (2)

From (1) and (2),

Nt/Nο = e∧(-(0.693 / 10 min) x 20 min) 
Nt/Nο = 0.2500

Percentage of remaining nuclei = (nuclei at t time / initial nuclei) x 100%
                                                     
= (Nt/Nο ) x 100%
                                                      = 0.2500 x 100%
                                                      = 25.00%

Hence, Percentage of remaining nuclei is 25.00%
You might be interested in
What are the products in the following chemical reaction?
hodyreva [135]

The products are on the right side of the chemical equation, while the reactants are on the left side of the chemical equation.

Therefore if we have:

methane + oxygen → carbon dioxide + water

Then the reactants are methane + oxygen

The products are: A) Carbon dioxide + Water

4 0
3 years ago
Describe an electron cloud. Then, name and explain a particular atomic model that used the concept of the electron cloud.
pochemuha

Electron cloud is the region around the nucleus in an atom where we can locate an electron.

The concept of electron cloud model was introduced by the Schrodinger and Heisenberg. According to this model, it would be difficult to know the position of the electrons in an atom and they are not particles that orbit around the nucleus.  We can only expect the electrons to be present in specific areas called the electron clouds around the nucleus. It is the quantum mechanical model that used the concept of electron clouds. According to the model, the electron cloud or an orbital is a space around the nucleus in an atom where the probability of finding an electron is 90%. It explains that electrons show wave nature. It is difficult to determine the exact position and momentum of an electron in an atom.

3 0
3 years ago
Which of the following correctly labels the solute and solvent in a solution of ocean water?
DanielleElmas [232]

Hello there!

The solute is salt, and the solvent is water. So the answer is #1.

PS. Can I have Brainliest?

8 0
3 years ago
Why isn't the mass of the electron included in the mass of an atom on the periodic table?
marta [7]
Its A because............
5 0
4 years ago
I got a question how come there are seven billion people in this world and I'm still SINGLE !!!
crimeas [40]
You never need someone to actually progress living, you can have one person, but all you need is yourself :)
7 0
3 years ago
Read 2 more answers
Other questions:
  • Calculate the pressure in atmospheres exerted by 10.0 moles of hydrogen gas at 293 Kelvin if it is stored in a 7.50 liter contai
    12·1 answer
  • List two examples of solids, liquids, and gases
    6·2 answers
  • What are two properties of neural substance?
    9·1 answer
  • Question 13 unsaved the nonmetals in groups 5a, 6a, and 7a: question 13 options: lose electrons when they form ions. form ions w
    15·1 answer
  • Calculate the temperature of a gas that originally occupied 3.45 L and is expanded to 5.25 L. The original temperature of the ga
    12·1 answer
  • In terms of bonds, what would the molecule C₆H₁₂ be classified as?
    5·1 answer
  • Which compound is shown in the illustration? <br> Thank you!!
    8·2 answers
  • 1. Which of the following is an inherited trait?
    5·1 answer
  • PLEASE HELP! MAJOR GRADE!
    10·1 answer
  • The largest pieces being dragged along the streambed are undergoing the process called ________. pushing saltation traction susp
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!