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malfutka [58]
3 years ago
13

Where does radioactivity come from?

Chemistry
1 answer:
julia-pushkina [17]3 years ago
3 0

Answer:

C. radioactive material

Explanation:

This exposure primarily comes from cosmic rays, radioactive material in the earth (such as uranium-238), ingestion of naturally occurring radionuclides in food (such as potassium- 40), and inhalation of radon gas. In the United States, the average background radiation dose is 300 mrem/yr.

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An oxide and carbonate containing oxygen​
exis [7]

Answer:

example of carbonate containing oxygen :

  • CaCO3

( calcium carbonate having 3 atoms of oxygen )

example of oxide containing oxygen :

  • CO2

( carbon dioxide having 2 atoms of oxygen )

5 0
3 years ago
The molecular mass of a substance refers to the:
ololo11 [35]

Answer:

A

Explanation:

it's the sum of the masses of all the atoms in the molecule

please like and Mark as brainliest

3 0
3 years ago
WILL GIVE FREE BRAINLIEST EVERYDAY! DO NOT look up answers!! PLEASE FOLLOW DIRECTIONS ON FUTURE QUESTIONS OR WRONG!!! (Branliest
Maslowich

Answer:

  • <u>Purpose of Iodine:</u>

Iodine plays a vital role in thyroid health. Our thyroid gland, which is located at the base of the front of your neck, helps regulate hormone production. These hormones control your metabolism and heart health.

  • <u>Symbol:</u>

The symbol of Iodine is " I ".

  • <u>Atomic Mass:</u>

Atomic mass of Iodine is 126.90447 u

  • <u>Protons:</u>

No. of protons in Iodine is 53.

  • <u>Neutrons:</u>

No. of neutrons in Iodine is 74.

  • <u>Electrons:</u>

No. of electrons in Iodine is 53.

8 0
2 years ago
Select the correct answer from the drop-down menu. a scientist digs up sample of arctic ice that is 458,000 years old. he takes
Jlenok [28]

The original mass of krypton 81 that is present in the ice is 6.70 grams.

<h3>How do we calculate original mass?</h3>

Original mass of any substance will be calculated as below for the decomposition reaction is:

N = N₀(1/2)ⁿ, where

N = remaining mass of krypton-81 = 1.675g

N₀ = original mass of krypton-81 = ?

n will be calculated as:
n = T/t, where

T = total time period = 458,000 years

t = half life time = 229,000 years

n = 458,000/229,000 = 2

Now putting all these values on the above equation, we get

N₀ = 1.675 / (1/2)²

N₀ = 6.70 g

Hence required mass is 6.70 g.

To know more about half life time, visit the below link:
brainly.com/question/2320811

8 0
2 years ago
Investigating a fire scene, Investigator Smith determines several places where fires started. What might this indicate about the
grigory [225]

Answer:

an accelerant was used because maybe some was spilt and therefore leaving a smell and evidence

3 0
3 years ago
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