Q3 CHEM 1032, General ChemistryRecitation Packets Series, 20201. Technetium-99 is produced by a sequence of reactions in which molybdenum-98 is bombardedwith neutrons to form molybdenum-99, which undergoes B decay to technetium-99m.Write the balanced nuclear equations for this sequence.a.b. Compare the neutron-to-proton ratio of the final daughter product with that ofmolybdenum-99. Which is closer to the valley of stability?2. Actinium-225 decays by successive emission of three a particles.Write the nuclear equations for the three decay processes.b. Compare the neutron-to-proton ratio of the final daughter product with that of actinium-225. Which is closer to the valley of stability?a,Activity 3. Kinetics of radioactive decays.3. Approximately how old is a fossil with 12 g of 14C if it initially possessed 32 g of 1"C?4. Approximately what percentage of an initial sample of "C remains after 33,450 years?5. A laboratory investigation shows that a sample of uranium ore contains 5.37 mg of 235U and 2.52mg of 20 Pb. Calculate the age of the ore. The half-life of 235U is 4.5 x 10°yr.6. Uranium-238 decays through a series of a and B emissions to lead-206, with an overall half-life forthe entire process of 4.5 Ga. Calculate the age of a uranium-bearing ore that is found to have a238U/206P6 ratio ofa.1.00b. 1.257. (a) Use a standard graphing program to plot the fraction of C remaining in an archaeologicalsample 40.0 ky (kiloyears) old as a function of time. For convenience, use intervals of 1000 y.(b) Plot the natural logarithm of the fraction of l C remaining against time.(c) After what period of time will less than 1.00% of the original 1C in the sample remain?

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Approximately how old is a fossil with 12 g of 4C if it initially possessed 32 g of 4C?

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Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Matter and Measurement

In the universe, there is matter, energy, and void space. The universe contains energy and void space. The definition of matter can be considered as something which possesses mass and consumes space. Chemistry is that branch of science which deals with the study of matter. Under chemistry, nature, composition, and the changes occurring to matter are discussed.

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CHEM 1032, General Chemistry
Recitation Packets Series, 2020
1. Technetium-99 is produced by a sequence of reactions in which molybdenum-98 is bombarded
with neutrons to form molybdenum-99, which undergoes B decay to technetium-99m.
Write the balanced nuclear equations for this sequence.
a.
b. Compare the neutron-to-proton ratio of the final daughter product with that of
molybdenum-99. Which is closer to the valley of stability?
2. Actinium-225 decays by successive emission of three a particles.
Write the nuclear equations for the three decay processes.
b. Compare the neutron-to-proton ratio of the final daughter product with that of actinium-
225. Which is closer to the valley of stability?
a,
Activity 3. Kinetics of radioactive decays.
3. Approximately how old is a fossil with 12 g of 14C if it initially possessed 32 g of 1"C?
4. Approximately what percentage of an initial sample of "C remains after 33,450 years?
5. A laboratory investigation shows that a sample of uranium ore contains 5.37 mg of 235U and 2.52
mg of 20 Pb. Calculate the age of the ore. The half-life of 235U is 4.5 x 10°yr.
6. Uranium-238 decays through a series of a and B emissions to lead-206, with an overall half-life for
the entire process of 4.5 Ga. Calculate the age of a uranium-bearing ore that is found to have a
238U/206P6 ratio of
a.
1.00
b. 1.25
7. (a) Use a standard graphing program to plot the fraction of C remaining in an archaeological
sample 40.0 ky (kiloyears) old as a function of time. For convenience, use intervals of 1000 y.
(b) Plot the natural logarithm of the fraction of l C remaining against time.
(c) After what period of time will less than 1.00% of the original 1C in the sample remain?

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