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
Karolina [17]
3 years ago
8

Iodine-131 is a radioactive isotope. after 9.00 days, 46.0% of a sample of 131i remains. what is the half-life of 131i?

Chemistry
1 answer:
4vir4ik [10]3 years ago
6 0

For this problem, we use the integrated rate law for first order radioactive decay which is expressed as follows:<span>

An = Aoe^-kt

where An is the amount left after time t, Ao is the initial amount and k is a constant. 

We need to calculate first the value of k from the given ration An/Ao and the time it reached that ration. We do as follows:

An = Aoe^-kt
0.46= e^-k(9)
k = 0.0863 / day

At half life, the remaining substance would be equal to one-half of the original so that An/Ao would be equal to 1/2 or 0.50. We calculate the half-life as follows:</span>

<span>
An = Aoe^-kt
0.50 = e^-0.0863(t)
<span>t = 8.03 days</span></span>

You might be interested in
What type of solid is candle wax? Pls explain
kolbaska11 [484]
<span>the type of solid of the candle wax is amorphous.

 as the amorphous is doesn't melt at a certain temperature . and it is amorphous because it gets softer and softer and it doesn't melt at a certain temperature. so the wax shape change and being softer and when it re-cooled its shape will become harder again, without melting at distinct temperature.</span>
5 0
3 years ago
Care needs to be taken when adding acid to base because
nikitadnepr [17]
<span>Mixing an acid and a base results in neutralization, but the results are potentially dangerous. No matter which acid or base is used, the resulting solution is water and varying types of salt. The process of neutralization often involves the substances heating up when they come together. If the solution heats up too much or too fast, a violent explosion or the creation of harmful or flammable gases is a possibility. This occurs when the chemicals are mixed too quickly, the acid and base are too strong or if there is no available salt to be made in the solution.</span>
3 0
3 years ago
Help me pls I put 49 point( every single point that I have) pls help me
Aliun [14]

Answer:

Chemical reaction, compound, molecule, covalent bonds, ionic bonds, ions. (first page)

Oxygen and hydrogen, 1 hydrogen 2 oxygen, H2O, a covalent bond, then mark off is always a liquid. (Second page)

Explanation:

6 0
3 years ago
What does a biochemical solar panel have
Viktor [21]
I agree with the person on top have a beautiful day:)
4 0
3 years ago
Consider the balanced equation below.
Karo-lina-s [1.5K]

The correct option is (a) H₂S : SO₂ = 2 : 2 and O₂ : H₂O = 3 : 2

<h3>What is molar Ratio ?</h3>

Molar ratio also known as stoichiometry is the ratio in which the reactants and products are either formed or reacted in the given equation

the balanced equation is as follows ;

2H₂S + 3O₂ --> 2SO₂ + 2H₂O

molar ratio can be determined by the coefficients of the compounds in the balanced reaction.

coefficient is the number in front of the chemical compound

coefficients for the compounds in this reaction are as follows ;

  • H₂S - 2
  • O₂ - 3
  • SO₂ - 2
  • H₂O - 2

therefore, correct option is (a) H₂S:SO₂ = 2:2 and O₂:H₂O = 3:2

Learn more about molar ratio here ;

brainly.com/question/17920577

#SPJ1

4 0
2 years ago
Other questions:
  • As a bond between a hydrogen atom and a sulfur atom is formed, electrons are(1) shared to form an ionic bond(2) shared to form a
    9·1 answer
  • Alka seltzer and water from
    11·1 answer
  • What would happen if a TLC plate was placed in a jar where the solvent level was above the level of the origin (sample spot)? Wh
    9·2 answers
  • Rosa was looking for patterns to help predict the products of chemical reactions. She recorded three similar decomposition react
    7·2 answers
  • Fe(OH)2+HCI--&gt; FeCl2+H2O balanced​
    8·1 answer
  • A change in state (phase change) occurs when thermal energy is added or taken away from a system.
    11·2 answers
  • the mass concentration the mass concentration for a solution containing 45 g of calcium carbonate is 100 cm3 ​
    8·1 answer
  • How much sugar can be dissolved of the 0.3 ml of water is heated to 1000C?
    6·1 answer
  • 2. Florida has mild winter temperatures due to the _____?
    10·1 answer
  • Which statement best describes the relationship between ocean CO2 and pH?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!