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tatyana61 [14]
3 years ago
15

What knowledge is radiometric dating based upon? A. the rate of decay for certain isotopes B. the name of the rocks C. the weigh

t of the samples D. the sequence of layers in the rocks
Chemistry
2 answers:
lapo4ka [179]3 years ago
5 0

Answer is: A. the rate of decay for certain isotopes.

For example, radiocarbon dating is called Carbon-14 dating.

Carbon-14 is a radioactive isotope of carbon, with a half-life of 5730 years.

Carbon bound in fossil fuels has different isotopes than carbon in atmosphere. Fossil fuels are underground and cosmic rays do not affect carbon in them same as atmosphere carbon. Carbon in fossil fuels that is underground longer than ten thousand years has only C-12 isotope and not C-14.

beks73 [17]3 years ago
3 0
The rate of decay for certain isotopes
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Which of the following are considered pure substance??
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Answer:

Explanation:

I’m 99.9% sure that it’s an element because it can’t be broken down any more than it already is.

7 0
4 years ago
All of the following can increase the rate of chemical reaction EXCEPT:
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Except catalyst because catalyst typically speed up a reaction by reducing the activation energy or changing the reaction mechanism.

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Determine the value of Kc for the following reaction if the equilibrium concentrations are as follows: [H2]eq = 0.14 M, [Cl2]eq
pentagon [3]

Question:

A) 12

B) 29

C) 2.1 × 10⁻²

D) 8.7 × 10⁻²

E) 47

Answer:

The correct option is;

E) 47

Explanation:

Kc, which is the equilibrium constant of a chemical reaction is derived by finding the ratio between the product of the equilibrium concentration of the product raised to their respective coefficients to the product of the equilibrium concentration of the reactants also raised to their respective coefficients.

Here we have;

[H₂] = 0.14 M

[Cl₂] = 0.39 M

[HCl] = 1.6

The reaction is given as follows;

H₂ (g) + Cl₂ (g) ⇄ 2HCl (g)

The formula for Kc is given as follows;

Kc = \frac{[HCl]^2}{[H_2][Cl_2]} = \frac{1.6^2}{0.14 \times 0.39}  = 46.886

Therefore, the Kc for the reaction is approximately equal to 47.

3 0
3 years ago
What is the density of lithium metal (in g/cm3) if a cube measuring 0.82 cm × 1.45 cm × 1.25 cm has a mass of 0.794 g?
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Density is given by mass divided by the volume of a substance.
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7 0
4 years ago
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