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Chemistry: The Central Science | 12th Edition | ISBN: 9780321696724 | Authors: Theodore E. Brown; H. Eugene LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward ISBN: 9780321696724 27

Solution for problem 2E Chapter 2

Chemistry: The Central Science | 12th Edition

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Chemistry: The Central Science | 12th Edition | ISBN: 9780321696724 | Authors: Theodore E. Brown; H. Eugene LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward

Chemistry: The Central Science | 12th Edition

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Problem 2E

The following diagram is a representation of 20 atoms of a fictitious element, which we will call nevadium (Nv). The red spheres are 293Nv, and the blue spheres are 295Nv. (a) Assuming that this sample is a statistically representative sample of the element, calculate the percent abundance of each element. (b) If the mass of 293Nv is 293.15 amu and that of 295Nv is 295.15 amu, what is the atomic weight of Nv? [Section 2.4]

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Monday, February 1, 2016 Chapter 2 cont. charge on e = 1.609 x 10 -19c calculated mass on e = 9.11 x 10 -31kg Millikan Oil Drop experiment - Observed charges on oil droplets produced by x-rays with voltage on and voltage off. Voltage on-> droplets with negative charge will fall more slowly or even rise. - There must be another particle to neutralize atom. Proton • Radioactive material discoveries - gamma γ: high energy photons - alpha α: (helium nucleus) heavy emission - beta β: (free electrons) negative emission • Rutherford (1871-1937) Gold Foil experiment - tests “plum-pudding” model and concludes with his “nuclear” model - Noble Prize in Chemistry 1908 α Bombardment of Metal Foil: about 1

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Textbook: Chemistry: The Central Science
Edition: 12
Author: Theodore E. Brown; H. Eugene LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward
ISBN: 9780321696724

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