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irga5000 [103]
1 year ago
7

Uranium and radium are found in many rocky soils throughout the world. Both undergo radioactive decay, and one of the products i

s radon-222, the heaviest noble gas (t₁/₂ = 3.82 days). Inhalation of this gas contributes to many lung cancers. According to Environmental Protection Agency recommendations, the level of radioactivity from radon in homes should not exceed 4.0 pCi/L of air.(a) What is the safe level of radon in Bq/L of air?
Chemistry
1 answer:
Inessa05 [86]1 year ago
5 0

(a) <u>0.15 Bq/L</u> is the safe level of radon in Bq/L of air/

<h3>Radionuclides: Uranium and Radium</h3>

So you've just had your water tested and the lab results are telling you that you've got radionuclides.

Radionuclides are radioactive isotopes or unstable forms of elements.  Radioactivity is the release of energy, radiation, that occurs when these unstable elements decay or breakdown into more stable elements.  This process is known as radioactive decay and is measured by the half-life of the element.  The half-life is the time required for half of the original element to decay.  The half-life for radionuclides can range from a few thousands of a second to a few billion years.

The two most common radionuclides found in groundwater supplies are Uranium and Radium.  Uranium and Radium are naturally occurring elements that are found throughout the Mid-Atlantic and Northeastern United States in bedrock deposits like shale or granite deep below the surface.  Rather than the glowing green rocks often portrayed in cinema or television, uranium and radium are found in ores mixed with other minerals and metals.  

Uranium is the largest naturally occurring element on earth, nearly 70% denser than lead, and exists naturally as three different isotopes: U-234, U-235, and U-238, with U-238 and U-235 being the most common.  U-235 is the preferred isotope for nuclear power generation.  All three forms of uranium have the same chemical and physical properties, but have different radioactive properties.

In very low pH conditions, uranium exists in a cation oxidized form UO2, but it is most commonly present as anionic compounds UO2(CO3)2 and UO2(CO3)3.  As uranium decays naturally over time, it releases radiation and forms new elements like radium, lead, and radon gas.

Learn more about radon

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I know how to solve it with D=M/V and M1V1 however the answer isn’t correct. Help me please
lara31 [8.8K]

Answer:

23.28 g of O2.

Explanation:

We'll begin by calculating the mass of hexane. This can obtain as follow:

Volume of hexane = 10 mL

Density of hexane = 0.66 g/mL

Mass of hexane =?

Density = mass /volume

0.66 = mass of hexane /10

Cross multiply

Mass of hexane = 0.66 x 10

Mass of hexane = 6.6 g

Next, we shall write the balanced equation for the reaction. This is given below:

2C6H14 + 19O2 —> 12CO2 + 14H2O

Next, we shall determine the masses of C6H14 and O2 that reacted from the balanced equation. This can be obtained as follow:

Molar mass of C6H14 = (12.01x6) + (1.008 x 14)

= 72.06 + 14.112

= 86.172 g/mol

Mass of C6H14 from the balanced equation = 2 x 86.172 = 172.344 g

Molar mass of O2 = 16x2 = 32 g/mol

Mass of O2 from the balanced equation = 19 x 32 = 608 g

From the balanced equation above,

172.344 g of C6H14 reacted with 608 g of O2.

Finally, we shall determine the mass of O2 needed to react with 10 mL (i.e 6.6 g) of hexane, C6H14. This can be obtained as follow:

From the balanced equation above,

172.344 g of C6H14 reacted with 608 g of O2.

Therefore, 6.6 g of C6H14 will react with = (6.6 x 608)/172.344 = 23.28 g of O2.

Therefore, 23.28 g of O2 is needed for the reaction.

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Compare the vapor pressure curves of 1-butene and 1-heptene. Explain your reasoning.
bixtya [17]
Because for there health

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Which man made element is in an anomalous location
krok68 [10]
 the man made element that is in an anomalous location is Transuranium.
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Amylose is a form of starch which has ________. only β-1,4-bonds between glucose units only α-1,4-links bonds glucose units hemi
forsale [732]

Answer: Amylose is a form of starch which has only α-1,4-links bonds glucose units.

Explanation:

Amylose is a polysaccharide made up of α(1-4) bound glucose molecules. The carbon atoms on glucose are numbered, starting at the aldehyde (C=O) carbon, so, in amylose, the 1-carbon on one glucose molecule is linked to the 4-carbon on the next glucose molecule.

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Why don't elements in a group have consicutive atomic numbers?​
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Answer:

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