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klemol [59]
2 years ago
5

what is the half life of a radioactive sample if 100.0 grams of it decays to 12.5 grams in 24.3 hours

Chemistry
1 answer:
frutty [35]2 years ago
7 0

The Half-Life of the radioactive sample is 8.1 hours.

<h3>What is half life of a radioactive element?</h3>

The half-life of a radioactive substance is the time taken for half the amount of atoms in the given substance to decay.

12.5 grams remains out of 100 grams of the sample.

This is 1/8 of the original samples.

1/8 of the original sample reperesent three half-lives undergone.

Half-Life of the radioactive sample = 24.3/3 = 8.1 hours

Therefore, the Half-Life of the radioactive sample is 8.1 hours.

Learn more about Half-Life at: brainly.com/question/25750315

#SPJ1

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The equilibrium: 2 NO2(g) \Longleftrightarrow&amp;iff; N2O4(g) has Kc = 4.7 at 100ºC. What is true about the rates of the forwar
Sergeeva-Olga [200]

Answer:

  • Initial: forward rate > reverse rate
  • Equilibrium: forward rate = reverse rate

Explanation:

2NO₂(g) → N₂O₄(g)   Kc=4.7

The definition of <em>equilibrium</em> is when the forward rate and the reverse rate are <em>equal</em>.

Because in the initial state there's only NO₂, there's no possibility for the reverse reaction (from N₂O₄ to NO₂). Thus the forward rate will be larger than the reverse rate.

7 0
3 years ago
All of the following statements concerning crystal field theory are true EXCEPT Group of answer choices in an isolated atom or i
yaroslaw [1]

Answer:

low-spin complexes contain the maximum number of unpaired electrons.

Explanation:

In the crystal field theory, the magnitude of crystal field splitting and the pairing energy determines whether a complex will be low spin or high spin.

Low spin complexes often have greater magnitude of crystal field splitting energy than low spin complexes.

High spin complexes have maximum number of unpaired electrons(most of the electrons are unpaired) while low spin complexes have a minimum number of unpaired electrons in a complex(most of the electrons are paired).

6 0
3 years ago
Identify the neutralization reaction.
dusya [7]

The neutralization reaction among all the reactions would be the one between an acid and a base to produce salt and water.

<h3>What is a neutralization reaction?</h3>

It is a reaction involving an acid and a base to produce salt and water.

From the list of reactions, the only reaction that involves acid and a base with salt and water being the products is the first reaction.

Thus, the neutralization reaction is represented by the equation:

2H_3PO_4 + 3Ba(OH)_2 --- > 6H_2O + Ba(PO_4)_2

More on neutralization reactions can be found here: brainly.com/question/20038776

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4 0
2 years ago
HELP ME PLSSSS USATP
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Answer:

Apple tree is a producer

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Rabbit is a herbivore

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Explanation: .

7 0
3 years ago
Students mixed 20 mL of white glue and 20 mL of water in a cup. They added three drops of food coloring to the mixture. Then, 15
Dmitry_Shevchenko [17]

Hi im here to help!

Answer: a chemical reaction occurred because a new substance was formed with new properties!

Explanation: when u mix glue water and borax it forms into a new substance which is a chemical reaction

8 0
3 years ago
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