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3 years ago

B. the radioactive atom decays by alpha emission. write an equation showing the decay. (1 point)

1 answer:

7 0

alpha decay is an emission of ₂⁴He nucleus. If an element undergoes an alpha decay, the mass of the daughter nucleus formed is reduced by 4 compared to mass of parent atom and atomic number is reduced by 2 compared to atomic number of parent atom.

Let's assume that the parent atom is X, atomic number is z and mass number is A. Then the formed daughter nucleus, Y should have atomic number as z-2 and mass number as A-4.

The equation is

(z) (A)X → ₂⁴α + (z-2)(A-4)Y

Example:

₉₄²³⁹Pu → ₂⁴α + ₉₂<span>²³⁵U</span>

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3 years ago

PLEASE HELP ME

Dmitriy789 [7]

Hello!

The ball took up 2,9L

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3 years ago

What is the relationship between frequency and wavelength?

IrinaVladis [17]

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3 years ago

You make two dilutions. You take 83.52 mL of the stock solution and dilute to 500.0 mL to make Solution #1. You then add 52.27 m

kati45 [8]

Answer:

The answer to the question is;

The concentration of the Solution #1 in terms of molarity is

0.16704X moles/litre.

Explanation:

Let the concentration of the stock solution be X moles/liter

Therefore, 83.52 ml of the stock solution contains

83.52×(X/1000) moles

Dilution of 83.52 ml of X to 500 ml gives solution 1 with a concentration of

500 ml of solution 1 contains 83.52×(X/1000) moles

Therefore 1000 ml or 1 litre contains 2×83.52×(X/1000) moles = 0.16704X moles/litre

The molarity of solution 1 is 0.16704X moles/litre.

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4 years ago