EBK GENERAL CHEMISTRY: THE ESSENTIAL CO
EBK GENERAL CHEMISTRY: THE ESSENTIAL CO
7th Edition
ISBN: 8220106637203
Author: Chang
Publisher: YUZU
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Chapter 21, Problem 21.29QP
Interpretation Introduction

Interpretation:

From the given details of the strontium -90, it should be calculated the years it will take for 1.00 g of the isotope to be reduced to 0.200g by decay.

Concept Introduction:

  • Unstable nuclei emit radiation spontaneously to become stable nuclei by losing energy. This process of emission of radiation by unstable nuclei is known as radioactive decay.
  • These emitted radiations may be alpha radiations(α), beta radiations(β) or gamma radiations(γ)
  • These unstable nuclei are the nuclei with more than 83 protons and which do not lie within the belt of stability.
  • Radioactive decay are in the first order kinetics. Rate of radioactive decay at a time t is,

    Rate of decay at a time 't' = k Nk-Firstorderrateconstant and its unit is t1N-numberofradioactivenucleipresentattime't

    Suppose the number of radioactive nuclei at time zero is N0 and at a time t is Nt,

    lnNtN0=-kt

  • Half-life of radioactive decay is the time required for a radioactive sample to decay to one half of the atomic nucleus.

    Half-life of the radiation,  t1/2=0.693k

    Half-life and rate constant for radioactive isotopes vary greatly from nucleus to nucleus. 

The value of k

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Chapter 21 Solutions

EBK GENERAL CHEMISTRY: THE ESSENTIAL CO

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