Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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How are the rate constant and the half-life related?
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- The half life for the radioactive decay of potassium-40 to argon-40 is 1.26 × 10 years. Suppose nuclear chemical analysis shows that there is 0.727 mmol of argon-40 for every 1.000 mmol of potassium-40 in a certain sample of rock. Calculate the age of the rock. Round your answer to 2 significant digits. db years Submit Assignment O 2020 McGraw-Hi Education. All Rights Reserved. Terms of Uhe I Pivacy I Accessibility 1113 PM 0 49 12/17/2020 O Type here to search FULL HD 1080 Ecer Del Pg Up Pause Home F11 F12 PrtSc F6 F7 F8 F9 F10 Sa Lk SysRq Break Ins F2 F3 F4 F5 Esc F1 63 z' Nu & Backspace @ # 7 8.arrow_forwardPlease don't provide handwritten solution ...arrow_forwardA certain signal molecule S in brain tissue is degraded by two different biochemical pathways: when only Path 1 is active, the half-life of S is 9.0 s. When only Path 2 is active, the half-life of S is 67.7 s. Calculate the half-life of S when both pathways are active. Rounded your answer to 2 significant digits.arrow_forward
- The rate constant for the decay of a radioactive isotope is 4.234 x 10-3/day. What is the half-life of this isotope (in days)?arrow_forwardIf the reaction is first-order with a half-life of 3.0 minutes choose the correct pictures which represent the reaction mixture after 3.0 minutes and 6.0 minutes have elapsedarrow_forwardIn a patient, the fraction of radioactive iodine 131I (Iodine) remaining after 32 days was found to be 1/16. Using this information and your knowledge of the rate law, show that the half-life of radioactive iodine is 8.0 days.arrow_forward
- Consider the radioisotope ⁴¹Ca (half life = 1.03 × 10⁵ years). What is the first-order rate constant for ⁴¹Ca?arrow_forwardThe rate constant for the decay of a radioactive element is 2.09 x 10 3 day1. What is the half-life of this element? days 1 4 6. 8 9. +/- x 100 12:01 AM Type here to search 4/17/2021 3. 7. 近arrow_forwardFallout from nuclear weapons tests in the atmosphere is mainly 90Sr and 137Cs , which have 28.6- and 32.2-y half-lives, respectively. Atmospheric tests were terminated in most countries in 1963, although China only did so in 1980. It has been found that environmental activities of these two isotopes are decreasing faster than their half-lives. Why might this be?arrow_forward
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