Date of detonation of first atomic bomb is given. Percentage of strontium − 90 still remaining is to be stated. Concept introduction: A process through which an unstable nuclide loses its energy due to excess of protons or neutrons is known as radioactive decay. Decay constant is the quantity that expresses the rate of decrease of number of atoms of a radioactive element per second. Half-life of radioactive sample is defined as the time required for the number of nuclides to reach half of the original value. To determine: Percentage of strontium − 90 remaining after the first explosion.

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Chances Ad ~stract one 11. (10pts total) Consider the radical chlorination of 1,3-diethylcyclohexane depicted below. 4 • 6H total $4th total Statistical pro 21 total 2 H A 2H 래 • 4H totul < 3°C-H werkest bund - abstraction he leads to then mo fac a) (6pts) How many unique mono-chlorinated products can be formed and what are the structures for the thermodynamically and statistically favored products? рос 6 -વા J Number of Unique Mono-Chlorinated Products Thermodynamically Favored Product Statistically Favored Product b) (4pts) Draw the arrow pushing mechanism for the FIRST propagation step (p-1) for the formation of the thermodynamically favored product. Only draw the p-1 step. You do not need to include lone pairs of electrons. No enthalpy calculation necessary H H-Cl

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Chapter 19, Problem 31E

Interpretation Introduction

Interpretation: Date of detonation of first atomic bomb is given. Percentage of strontium −90 still remaining is to be stated.

Concept introduction: A process through which an unstable nuclide loses its energy due to excess of protons or neutrons is known as radioactive decay. Decay constant is the quantity that expresses the rate of decrease of number of atoms of a radioactive element per second. Half-life of radioactive sample is defined as the time required for the number of nuclides to reach half of the original value.

To determine: Percentage of strontium −90 remaining after the first explosion.

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