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
My name is Ann [436]
3 years ago
6

Rn-222 has a half-life of 3.82 days. If 25.0 g of Radon-22 was originally present, approximately how many grams would be left af

ter 15 days?
Chemistry
1 answer:
horsena [70]3 years ago
6 0

Answer:

Approximately 0.39 g or 0.4 g if you're rounding up

Explanation:

15/3.82 = 3.92

Let's round that up to 4

That means 15 days is around 4 half lives

4 half lives means 1/16 of the original mass will be left

25/16 = 0.390625

You might be interested in
Carbon-14 is an isotope used in carbon dating. The nucleus becomes Nitrogen-14 through beta decay. Its half-life is 5370 years.
frosja888 [35]

Answer:

If the half-life of 14C is 5730 years, when this period of time has passed it will have been halved, it is called the exponential decay law of radioactive isotopes.

8 0
3 years ago
What is the difference between a purine and a pyrimidine?
GalinKa [24]

Answer: Adenine and guanine are the two purines and cytosine, thymine and uracil are the three pyrimidines. The main difference between purines and pyrimidines is that purines contain a sixmembered nitrogencontaining ring fused to an imidazole ring whereas pyrimidines contain only a sixmembered nitrogencontaining ring. They both are types or categories of nitrogen containing bases present in nuclei acids of DNA and RNA.

Purines are 2 Ring or Carbon Ring, Nitrogen containing bases. That consist of these 2 rings next placed next to each other. These examples include - Adenine and Guanine.

Pyrimidines are 1 or single Ring Nitrogen containing structures. There are 3 nitrogenous bases that are categorized as pyrimidines. Cytosine, Thymine, and Uracil.

4 0
2 years ago
Daniel is conducting an experiment on magnetic objects. He completes more than one trial. Why is it important for Daniel to do t
Luba_88 [7]

Answer:The conclusion is less accurate.

Explanation:

Feb 17, 2021 — He completes more than one trial. Why is it important for Daniel to do this?

4 0
2 years ago
Which component is required for the activation of some enzymes?
shepuryov [24]
The best answer is letter A. 
The main factors that change the speed of enzymatic reactions are temperature, pH and substrate concentration (quantity). <span>There are enzymes that need other associated molecules to work. These molecules are called enzyme co-factors. They can be organic ions like mineral salts.</span>
5 0
2 years ago
Read 2 more answers
A molecule <br> B compound<br> C atom<br> D element
Svetllana [295]

Answer:

D. Element.

Explanation:

Atoms form elements. Elements form molecules. Molecules form compounds.

8 0
3 years ago
Other questions:
  • Which of the following is a combustion reaction?
    8·1 answer
  • Identify three types of coral reefs
    15·1 answer
  • What two pieces of information do u need to describe force
    6·2 answers
  • Choose the ground state electron configuration for Cr3+.
    8·1 answer
  • PLEASE HELPP<br> Tell me everything you know about "balancing the equation" for science
    11·1 answer
  • HELP ME OUT LAST TIME!!!
    14·1 answer
  • How many moles of C6H1206 are consumed if 6 moles of O2 are consumed?​
    15·2 answers
  • Why does liquid exerts pressure​
    11·1 answer
  • If an atom with a mass number of 27 has 14 neutrons,it is an isotope of which element​
    9·2 answers
  • What are some of the forms of energy you used today? How did you use them?
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!