Quantity of Sr-90 that will be present after 84 years has to be calculated if the initial quantity taken was 8.00 g and half-life of Sr-90 is 28 years. Concept Introduction: Radioactive nuclides undergo disintegration by emission of radiation. All the radioactive nuclide do not undergo the decay at a same rate. Some decay rapidly and others decay very slowly. The nuclear stability can be quantitatively expressed by using the half-life. The time required for half quantity of the radioactive substance to undergo decay is known as half-life. It is represented as t 1 / 2 . The equation that relates amount of decayed radioactive material, amount of undecayed radioactive material and the time elapsed can be given as, ( Amount of radionuclide undecayed after n half lives ) = ( Original amount of radionuclide ) x ( 1 2 n )

Question

For each reaction below, decide if the first stable organic product that forms in solution will create a new CC bond, and check the appropriate box. Next, for each reaction to which you answered "Yes" to in the table, draw this product in the drawing area below. Note for advanced students: for this problem, don't worry if you think this product will continue to react under the current conditions - just focus on the first stable product you expect to form in solution. དྲ。 ✗MgBr ? O CI Will the first product that forms in this reaction create a new C-C bond? Yes No • ? Will the first product that forms in this reaction create a new CC bond? Yes No × : ☐ X

Answer 1

Question

Chapter 11, Problem 11.34EP

(a)

Interpretation Introduction

Interpretation:

Quantity of Sr-90 that will be present after 84 years has to be calculated if the initial quantity taken was 8.00 g and half-life of Sr-90 is 28 years.

Concept Introduction:

Radioactive nuclides undergo disintegration by emission of radiation. All the radioactive nuclide do not undergo the decay at a same rate. Some decay rapidly and others decay very slowly. The nuclear stability can be quantitatively expressed by using the half-life.

The time required for half quantity of the radioactive substance to undergo decay is known as half-life. It is represented as t1/2.

The equation that relates amount of decayed radioactive material, amount of undecayed radioactive material and the time elapsed can be given as,

(Amount of radionuclideundecayed after n half lives) = (Original amount of radionuclide) x (12n)

(b)

Interpretation Introduction

Interpretation:

Time taken to reduce 80.0 mg sample of Sr-90 to 10.0 mg has to be calculated if the half-life of Sr-90 is 28 years.

Concept Introduction:

Radioactive nuclides undergo disintegration by emission of radiation. All the radioactive nuclide do not undergo the decay at a same rate. Some decay rapidly and others decay very slowly. The nuclear stability can be quantitatively expressed by using the half-life.

The time required for half quantity of the radioactive substance to undergo decay is known as half-life. It is represented as t1/2.

The equation that relates amount of decayed radioactive material, amount of undecayed radioactive material and the time elapsed can be given as,

(Amount of radionuclideundecayed after n half lives) = (Original amount of radionuclide) x (12n)

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