PREVIOUS ANSWERSASK YOUR TEACHERPRACTICE ANOTHERThe first atomic explosion was detonated in the desert north of Alamogordo, New Mexico, on July 16, 1945. What percentage ofthe strontium-90 (t1/2 = 28.9 yr) originally produced by that explosion still remains as of July 16, 1961?* %

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Chemistry

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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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NUCLEAR REACTIONS Fill in the missing mass # and atomic #... 210 ? ? Pb 83 Bi+e
A radioactive isotope of Radium-226 undergoes an alpha decay, followed by 2 beta decays, then a final alpha decay. What is the isotope symbol of the primary product (ignore Helium)?
Iridium‑192 is one radioisotope used in brachytherapy, in which a radioactive source is placed inside a patient's body to treat cancer. Brachytherapy allows the use of a higher than normal dose to be placed near the tumor while lowering the risk of damage to healthy tissue. Iridium‑192 is often used in the head or breast. Use the radioactive decay curve of iridium‑192 to answer the three questions. The percentage of the sample remaining is plotted on the y axis versus the time in days on the x axis. Some of the points included on the decay curve are 0 days 100 percent remaining, 5 days 95.41 percent remaining, 25 days 79.08 percent remaining, 35 days 71.99 percent remaining, 40 days 68.69 percent remaining, 45 days 65.54 percent remaining, 55 days 59.67 percent remaining, 65 days 54.32 precent remaining, 70 days 51.83 percent remaining, 75 days 49.45 percent remaining, 80 days 47.19 percent remaining, 85 days 45.02 percent remaining, 105 days 37.31 percent remaining, 115 days 33.97…
5. One nuclide in each of these pairs is radioactive. Predict which is radioactive and which is stable: (a) Ca and Ca, (b) 12C and 14C, (c) lead- 206 and thorium-230. Explain your choice in each case.
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Write the identity of the missing nucleus for the following nuclear decay reaction: Express your answer as an isotope.
The first four steps in the radioactive decay sequence of Po-218 are a, B, a, B. To write the reaction equations for this decay series, first determine the product of t step. a decay of Po-218 gives: symbol = Pb mass number = 214 atomic number = 82 Po undergoes four decay reactions: a, B, a, B. Step 1. 218 Po undergoes a decay to give Pb In the second step, Pb-214 undergoes ß decay. What is the product of this step? symbol = mass number = atomic number =
Identify the unknown particle X in the following equations for nuclear decay, and state whether each process is alpha decay, beta decay, or gamma decay. (Enter your answers in the form A X Z . Enter γ (gamma) to indicate a gamma decay.) 14557La → X + 0−1e
Radioactive nuclides can decay through the release of several differ- ent types of radiation. ● D List the three basic types of radiation in order from most penetrating to least penetrating. Describe what happens to the mass number and the atomic number of a nuclide during alpha decay. Answer in complete sentences.
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Q4
NUCLEAR CHEMISTRY: Consider the nuclei Sn with an atomic number of 50 and mass number is 118. Determine its mass defect in kilograms if its atomic mass is 116.934 amu. The mass of a proton and neutron are 1.0073 and 1.0087 amu, respectively. Express your answers in three decimal places in scientific notation, i.e., 6.022e23 to represent 6.022× 10º.

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PREVIOUS ANSWERS ASK YOUR TEACHER PRACTICE ANOTHER The first atomic explosion was detonated in the desert north of Alamogordo, New Mexico, on July 16, 1945. What percentage of the strontium-90 (t1/2 = 28.9 yr) originally produced by that explosion still remains as of July 16, 1961? * %