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
Orlov [11]
4 years ago
11

If the half-life of a radioactive element is 4 days, how long will it take for three- fourths of a sample of the element to deca

y?
Chemistry
1 answer:
Jlenok [28]4 years ago
3 0

Answer:

\boxed{\text{8 da}}

Explanation:

The question will be easier to solve if we interpret it as, " How long will it take until one-fourth of a sample of the element remains,?"

The half-life of the element is the time it takes for half of it to decay.  

After one half-life, half (50 %) of the original amount will remain.  

After a second half-life, half of that amount (25 %) will remain, and so on.  

We can construct a table as follows:

\begin{array}{cccl}\textbf{No. of} & & \textbf{Fraction} & \\\textbf{half-lives} & \textbf{t/da} & \textbf{remaining} & \\1 & 4 & \dfrac{1}{2} & \\\\2 & 8 & \dfrac{1}{4}& \\\\3 & 12 & \dfrac{1}{8}& \\\end{array}

\text{We see that 8 da is two half-lives, and the fraction of the element remaining is $\frac{1}{4}$.}\\\text{It takes $\boxed{\textbf{8 da}}$ for three-fourths of the element to decay}

You might be interested in
What does AuCl, Gold (I) Chloride, decompose into?
Alexxx [7]

Answer:

Gold

Explanation:

Gold(I) chloride is a compound of gold and chlorine with the chemical formula AuCl

6 0
3 years ago
Name this chemical reaction H2 + 2 AgNO3 → 2 Ag + 2 HNO3
gulaghasi [49]

Answer:

Single Replacement Reaction

Explanation:

simply because only 1 element switched places.

6 0
3 years ago
Atoms are incredibly small and we cannot see them, even with very powerful microscopes. If we cannot see them, then how do we kn
Alekssandra [29.7K]
Albert Einstein showed in one of his papers in 1905 that Brownian motion could be explained by assuming that matter is made up of tiny particles. His paper predicted how the motion should look like and also allowed for the calculation of the mass of a single molecule. Current evidence includes: 1. Individual ions (atoms with an electric charge) can be manipulated using electric and magnetic fields. 2. Elevation maps can now be made that show bumps caused by individual atoms.
3 0
4 years ago
How many moles of nitrogen gas will occupy a volume of .5L at 1.0atm and 298K
hammer [34]
 <span>Use the Ideal law Equation :

P.V= n.R.T 

V = 0.5 L

P = 1.0 atm

</span><span>R= 0.0821 L*atm/mol*K 
</span>
<span>n = R*T/P*V 

</span><span>P*V= n*R*T 
</span>
1.0 * 0.5 = n *<span>0.0821*298

0,5 = n* 24.4658

n = 0,5 / 24.4658

n =0.0204 moles


</span>
8 0
3 years ago
Camilla believes that Earth's crust is evenly thick all around the globe, Maclaya thinks that Camilla is wrong, but doesatt know
xenn [34]

Answer:Macaya (floruit 1802), was a Kongolese-born Haitian revolutionary military leader. Macaya was one of the first black rebel leaders in Saint-Domingue to ally himself with the French Republican commissioners Sonthonax and Polverel. He helped to lead forces that recaptured Cap-Français on behalf of the French Republicans.

Macaya was born in west-central Africa, probably in the Kingdom of Kongo, and taken to the French colony of Saint-Domingue as a slave. After the outbreak of the 1791 slave rebellion in northern Saint-Domingue, Macaya became a lieutenant of an elderly rebel commander named Pierrot. Pierrot's rebel forces were based in the hills outside of Le Cap (Cap Francaise), near Bréda plantation by 1793.

Explanation:

7 0
3 years ago
Other questions:
  • Ratio of atoms in Hydrochloric acid
    5·1 answer
  • Which of the following statements is true about cellular respiration?
    6·2 answers
  • What is the chemical formula for the binary compound nitrogen dioxide?
    12·2 answers
  • What is the answer?
    8·2 answers
  • Predict the boiling point of water at a pressure of 1.5 atm.
    12·1 answer
  • HELP ASAP PLEASE!!! WILL MARK BRAINLIEST, ONLY ANSWER IF YOU'RE SURE
    9·2 answers
  • Carbon monoxide and chlorine gas react to form phosgene:
    13·1 answer
  • As you move from left to right within a period (row), what is the pattern?
    11·1 answer
  • How do you changes in the environment affect species extinction?​
    6·1 answer
  • In a mixture of hydrogen and helium gases, the mole fraction of helium is 0.750. If the partial pressure of hydrogen in the mixt
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!