Introduction to General, Organic and Biochemistry
11th Edition
ISBN:9781285869759
Author:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres
Publisher:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres
Chapter9: Nuclear Chemistry
Section: Chapter Questions
Problem 9.57P
Related questions
Question
1Which scientists influenced the progression of the atomic model? (Check all that apply)
Thomson
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Rutherford
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Bohr
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Dalton
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2The half-life of Calcium-47 is 3.91 x 105 seconds. A sample contains 4.11 x 1016 nuclei. How much of the sample is left after 7.82 x 105 seconds?
5.14 x 1015 nuclei
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2.57 x 1015 nuclei
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2.06 x 1016 nuclei
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1.03 x 1016 nuclei
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3After two half-lives, how much of the original sample would remain?
50%
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6.25%
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12.5%
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25%
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