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kotegsom [21]
3 years ago
14

which is the false statement about c14? a. it is a stable isotope. b. it is a radioactive isotope. c. it is present in all livin

g things. d. it is used to calculate the age of remains
Chemistry
2 answers:
MariettaO [177]3 years ago
6 0

Answer:

The false statement is option A.

Explanation:

A rare isotope of carbon is carbon-14. The carbon-14 is radioactive and decays to produce nitrogen-14 and an electron. As carbon-14 is radioactive, it decays at a similar rate possessing a half-life of about 5700 years. The isotope is found in all the living things and is generally used to find the age of remains. The process of finding the age of the remains is known as radiocarbon dating. However, the carbon-14 is not a stable component, and this is the reason why it undergoes radioactive decay.

Snowcat [4.5K]3 years ago
3 0
The false is A

as C-14 is an unstable isotope that is radioactive and is present in all living things i can be used to carbon date things 

hope that helps 
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Define valence electrons.
vodka [1.7K]

Answer:

Electrons on the outermost shell of an atom. They are responsible for the chemical properties of an atom.

8 0
3 years ago
What is the molarity of a solution that is 26.0% by mass in phosphoric acid, H3PO4, and that has a density of 1.155 g/mL?
steposvetlana [31]

Answer: The molarity of a solution that is 26.0% by mass in phosphoric acid is 3.06 M

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

Molarity=\frac{n\times 1000}{V_s}

n = moles of solute

V_s =volume of solution in ml

Given : 26.0 g of phosphoric acid in 100 g of solution.

To calculate the moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}=\frac{26.0g}{98g/mol}=0.265moles

Volume of solution =\frac{\text {Mass of solution}}{\text {Density of solution}}=\frac{100g}{1.155g/ml}=86.6ml

Molarity=\frac{0.265\times 1000}{86.6ml}=3.06M

Molarity of a solution that is 26.0% by mass in phosphoric acid is 3.06 M

8 0
4 years ago
Need help<br>no link<br><br><br><br>in how many days does the life cycle of mosquito complete?​
Dmitrij [34]

Answer:

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5 0
3 years ago
Read 2 more answers
The equilibrium constant of a reaction: A) is not related to the change in free energy of the reaction. B) is the same as the ma
Taya2010 [7]

Answer:) is related to the change in free energy of the reaction--d

Explanation:

For any reaction that is taking place at any moment the change in Gibbs Free Energy is related to the reaction quotient as

 ΔG=ΔG⁰+RTlnQ  

where R-Universal Gas Constant, T- Temperature in Kelvin, Q is the reaction quotient

Now when the system is in equilibrum,    ΔG⁰ which is the standard Gibb's Free Energy,is then  defined as

ΔG⁰=−RTlnK ,

where K is the equilibrium constant. because  ΔG becomes 0 and reaction quotient Q = K

The equilibrum constant   is related to the change in free energy of the reaction.

because when  ΔG is negative, the value of K is high which leads to a spontaneous. reaction

when   ΔG is positive, the value of K is low, which leads to a spontaneous. reaction in the opposite direction.

5 0
4 years ago
What mass of H₂ is needed to react with 8.75 g of O₂ according to the following equation: O2(g) + H2(g) → H₂O(g)?
FromTheMoon [43]

Explanation:

For reacting with 8.75 grams of oxygen, 1.08 grams of hydrogen is required.

The given balanced equation has been:

\rm O_2\;+\;2\;H_2\;\rightarrow\;H_2OO2+2H2→H2O

From the equation, 1 mole of oxygen reacts with 2 mole of hydrogen to give 1 mole of water.

The mass of oxygen has been: 8.75 g,

Moles = \rm \dfrac{weight}{molecular\;weight}molecularweightweight

Moles of oxygen = \rm \dfrac{8.75}{32}328.75

Moles of oxygen = 0.27 mol

Since,

1 mole Oxygen = 2 mole hydrogen

0.21 mol oxygen = 0.54 mol hydrogen

Mass of hydrogen = moles \times× molecular weight

Mass of hydrogen = 0.54 \times× 2

Mass of hydrogen = 1.08 grams.

Thus, for reacting with 8.75 grams of oxygen, 1.08 grams of hydrogen is required.

6 0
2 years ago
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