Exam 13: Inorganic Materials, Structure, Bonding in Solids, Molecular Spectroscopy, Photochemistry and Nuclear Chemistry

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Which of the following is not an acceptable location for an atom in a side-centered primitive cell?

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D

Which of the following will have the maximum ultraviolet absorbance at the longest wavelength?

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C

pertain to a 0.25 gram sample of the 32P nuclide which has a half life of 14.28 days and a specific activity of 1.07´1016 Bq·g-1. -Refer to Exhibit 19-1. What is the activity of the 0.25 gram sample initially?

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B

An element crystallizes in a body-centered cubic lattice, with a = 4.109 Å. If the element has a density of 9.95 g·cm-3, what is the molar mass of the element?

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Which estimates the number of electrons per cubic centimeter excited to the conduction band as a function of temperature and the band gap energy. Which estimates the number of electrons per cubic centimeter excited to the conduction band as a function of temperature and the band gap energy.    -Refer to Exhibit 22-2. The band gap of pure crystalline silicon is 1.94´10<sup>-</sup><sup>19</sup> J at 300 K. How many electrons are excited from the valence band to the conduction band at this temperature in a 1.00 cm<sup>3</sup> silicon crystal? -Refer to Exhibit 22-2. The band gap of pure crystalline silicon is 1.94´10-19 J at 300 K. How many electrons are excited from the valence band to the conduction band at this temperature in a 1.00 cm3 silicon crystal?

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pertain to a 0.25 gram sample of the 32P nuclide which has a half life of 14.28 days and a specific activity of 1.07´1016 Bq·g-1. -Refer to Exhibit 19-1. How long will it take for the activity of the 0.25 g sample to fall below 1 Ci? (1 Ci=3.7´1010 Bq)

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Which of the following symbols also represents a b particle?

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pertain to a 0.25 gram sample of the 32P nuclide which has a half life of 14.28 days and a specific activity of 1.07´1016 Bq·g-1. -Refer to Exhibit 19-1. What is the activity of the 0.25 gram sample after 30 days?

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pertain to a 450 gram sample of 60Co recovered from a decommissioned nuclear reactor. An activity of 1.11´1013 Bq was measured by technicians dismantling the plant. -Refer to Exhibit 19-2. The activity of the sample was measured a year later and found to be 9.73´1012 Bq. What is the decay constant?

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pertain to a 0.25 gram sample of the 32P nuclide which has a half life of 14.28 days and a specific activity of 1.07´1016 Bq·g-1. -Refer to Exhibit 19-1. What is the value of the decay constant k?

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Which estimates the number of electrons per cubic centimeter excited to the conduction band as a function of temperature and the band gap energy. Which estimates the number of electrons per cubic centimeter excited to the conduction band as a function of temperature and the band gap energy.    -Refer to Exhibit 22-2. Based solely on the equation above, which set of conditions will result in the most electrons being excited to the conduction band. -Refer to Exhibit 22-2. Based solely on the equation above, which set of conditions will result in the most electrons being excited to the conduction band.

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