5. Doos exactly % the decay of the isotope next to it? is decay a ra independent

Question

5. Doos exactly % the decay of the isotope next to it? is decay a ra independent of the other atoms the decay of the sot the sotopes decay in each 'w lite? Doe tho decay of one iatope random event that surrounding the decaying atom? Exoly 1 2 of the by on vsolope to decay to half of instial amount 6. How many how you determined your answer seconds are required for 1/2 of 200 "pennium isotope atoms to decay? Explain 7. Rate of decay is calculated as either the number of atoms decaying per unit time OR the number of decayed atoms appearing per unit time. For the following calculations, use the number of decayed atoms Determine the initial rate of decay using the first 10 seconds. Repeat the calculations but determine the rate of decay between the 50 second and 40 second time. Rate of decay (final time)-(initial time) Rate of decay-Itotal & decayedpenns (final time)-(initial time) a. Show work here. Include units on the answers. 10 seconds - O s)- 0.lo 0.lo pennies/seo Rate of decoy.(3p- b. Is the rate of decay constant or supports the observation. rate of decay change? Provide a reason that The yale of decoy 'e not conelant + chonges The ro Chem 245. Naclear Chemisry Revised Sp 17 29

Explanation / Answer

Absolutely! Half life(t1/2) is defined as time taken by an isotope to decay to half of Initial concentration.

Half life is also affected as evident from its rate expression which follows first order kinetics

-d[R]/dt = K[R]

as [R] gets consumed,the rate of decay decreases,

Also, It is a random processs, decay of one isotope is not afected by the decay of surrounding isotopes next,as it is happening effectively only in nucleus and not influenced by external conditions of temperature and pressure

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